ShadowExample()
: make_torus(1.0, 0.7, 72, 48)
, torus_indices(make_torus.Indices())
, torus_instr(make_torus.Instructions())
, object_projection_matrix(object_prog)
, object_camera_matrix(object_prog)
, object_model_matrix(object_prog)
, shadow_projection_matrix(shadow_prog)
, shadow_camera_matrix(shadow_prog)
, shadow_model_matrix(shadow_prog)
, object_color(object_prog)
, object_light_mult(object_prog) {
vs_object.Source(
"#version 140\n"
"in vec4 Position;"
"in vec3 Normal;"
"uniform mat4 ProjectionMatrix, CameraMatrix, ModelMatrix;"
"uniform vec3 LightPos;"
"out vec3 vertNormal;"
"out vec3 vertLight;"
"void main()"
"{"
" gl_Position = ModelMatrix * Position;"
" vertNormal = mat3(ModelMatrix)*Normal;"
" vertLight = LightPos - gl_Position.xyz;"
" gl_Position = ProjectionMatrix * CameraMatrix * gl_Position;"
"}");
vs_object.Compile();
fs_object.Source(
"#version 140\n"
"in vec3 vertNormal;"
"in vec3 vertLight;"
"uniform vec3 Color;"
"uniform float LightMult;"
"out vec4 fragColor;"
"void main()"
"{"
" float l = sqrt(length(vertLight));"
" float d = l > 0.0 ?"
" dot("
" vertNormal,"
" normalize(vertLight)"
" ) / l : 0.0;"
" float i = 0.3 + max(d, 0.0) * LightMult;"
" fragColor = vec4(Color*i, 1.0);"
"}");
fs_object.Compile();
object_prog.AttachShader(vs_object);
object_prog.AttachShader(fs_object);
object_prog.Link().Use();
object_projection_matrix.BindTo("ProjectionMatrix");
object_camera_matrix.BindTo("CameraMatrix");
object_model_matrix.BindTo("ModelMatrix");
object_color.BindTo("Color");
object_light_mult.BindTo("LightMult");
vs_shadow.Source(
"#version 150\n"
"in vec4 Position;"
"in vec3 Normal;"
"uniform mat4 ModelMatrix;"
"uniform vec3 LightPos;"
"out float ld;"
"void main()"
"{"
" gl_Position = ModelMatrix * Position;"
" vec3 geomNormal = mat3(ModelMatrix)*Normal;"
" vec3 lightDir = LightPos - gl_Position.xyz;"
" ld = dot(geomNormal, normalize(lightDir));"
"}");
vs_shadow.Compile();
gs_shadow.Source(
"#version 150\n"
"layout(triangles) in;"
"layout(triangle_strip, max_vertices = 12) out;"
"in float ld[];"
"uniform mat4 CameraMatrix, ProjectionMatrix;"
"uniform vec3 LightPos;"
"void main()"
"{"
" for(int v=0; v!=3; ++v)"
" {"
" int a = v, b = (v+1)%3, c = (v+2)%3;"
" vec4 pa = gl_in[a].gl_Position;"
" vec4 pb = gl_in[b].gl_Position;"
" vec4 pc = gl_in[c].gl_Position;"
" vec4 px, py;"
" if(ld[a] == 0.0 && ld[b] == 0.0)"
" {"
" px = pa;"
" py = pb;"
" }"
" else if(ld[a] > 0.0 && ld[b] < 0.0)"
" {"
" float x = ld[a]/(ld[a]-ld[b]);"
" float y;"
" px = mix(pa, pb, x);"
" if(ld[c] < 0.0)"
" {"
" y = ld[a]/(ld[a]-ld[c]);"
" py = mix(pa, pc, y);"
" }"
" else"
" {"
" y = ld[c]/(ld[c]-ld[b]);"
" py = mix(pc, pb, y);"
" }"
" }"
" else continue;"
" vec3 vx = px.xyz - LightPos;"
" vec3 vy = py.xyz - LightPos;"
" vec4 sx = vec4(px.xyz + vx*10.0, 1.0);"
" vec4 sy = vec4(py.xyz + vy*10.0, 1.0);"
" vec4 cpx = CameraMatrix * px;"
" vec4 cpy = CameraMatrix * py;"
" vec4 csx = CameraMatrix * sx;"
" vec4 csy = CameraMatrix * sy;"
" gl_Position = ProjectionMatrix * cpy;"
" EmitVertex();"
" gl_Position = ProjectionMatrix * cpx;"
" EmitVertex();"
" gl_Position = ProjectionMatrix * csy;"
" EmitVertex();"
" gl_Position = ProjectionMatrix * csx;"
" EmitVertex();"
" EndPrimitive();"
" break;"
" }"
"}");
gs_shadow.Compile();
fs_shadow.Source(
"#version 150\n"
"out vec4 fragColor;"
"void main()"
"{"
" fragColor = vec4(0.0, 0.0, 0.0, 1.0);"
"}");
fs_shadow.Compile();
shadow_prog.AttachShader(vs_shadow);
shadow_prog.AttachShader(gs_shadow);
shadow_prog.AttachShader(fs_shadow);
shadow_prog.Link().Use();
shadow_projection_matrix.BindTo("ProjectionMatrix");
shadow_camera_matrix.BindTo("CameraMatrix");
shadow_model_matrix.BindTo("ModelMatrix");
// bind the VAO for the torus
torus.Bind();
// bind the VBO for the torus vertices
torus_verts.Bind(Buffer::Target::Array);
{
std::vector<GLfloat> data;
GLuint n_per_vertex = make_torus.Positions(data);
Buffer::Data(Buffer::Target::Array, data);
VertexArrayAttrib attr(VertexArrayAttrib::GetCommonLocation(
MakeGroup(object_prog, shadow_prog), "Position"));
attr.Setup<GLfloat>(n_per_vertex);
attr.Enable();
}
// bind the VBO for the torus normals
torus_normals.Bind(Buffer::Target::Array);
{
std::vector<GLfloat> data;
GLuint n_per_vertex = make_torus.Normals(data);
Buffer::Data(Buffer::Target::Array, data);
object_prog.Use();
VertexArrayAttrib attr(object_prog, "Normal");
attr.Setup<GLfloat>(n_per_vertex);
attr.Enable();
}
// bind the VAO for the plane
plane.Bind();
// bind the VBO for the plane vertices
plane_verts.Bind(Buffer::Target::Array);
{
GLfloat data[4 * 3] = {-9.0f,
0.0f,
-9.0f,
-9.0f,
0.0f,
9.0f,
9.0f,
0.0f,
-9.0f,
9.0f,
0.0f,
9.0f};
Buffer::Data(Buffer::Target::Array, 4 * 3, data);
object_prog.Use();
VertexArrayAttrib attr(object_prog, "Position");
attr.Setup<GLfloat>(3);
attr.Enable();
}
// bind the VBO for the torus normals
plane_normals.Bind(Buffer::Target::Array);
{
GLfloat data[4 * 3] = {-0.1f,
1.0f,
0.1f,
-0.1f,
1.0f,
-0.1f,
0.1f,
1.0f,
0.1f,
0.1f,
1.0f,
-0.1f};
Buffer::Data(Buffer::Target::Array, 4 * 3, data);
object_prog.Use();
VertexArrayAttrib attr(object_prog, "Normal");
attr.Setup<GLfloat>(3);
attr.Enable();
}
Vec3f lightPos(2.0f, 9.0f, 3.0f);
ProgramUniform<Vec3f>(object_prog, "LightPos").Set(lightPos);
ProgramUniform<Vec3f>(shadow_prog, "LightPos").Set(lightPos);
gl.ClearColor(0.2f, 0.2f, 0.2f, 0.0f);
gl.ClearDepth(1.0f);
gl.ClearStencil(0);
gl.Enable(Capability::DepthTest);
gl.Enable(Capability::CullFace);
gl.FrontFace(make_torus.FaceWinding());
}
TessellationExample(void)
: shape_instr(make_shape.Instructions())
, shape_indices(make_shape.Indices())
, tess_level(prog, "TessLevel")
, viewport_dimensions(prog, "ViewportDimensions")
, projection_matrix(prog, "ProjectionMatrix")
, camera_matrix(prog, "CameraMatrix")
, model_matrix(prog, "ModelMatrix")
{
vs.Source(
"#version 330\n"
"in vec4 Position;"
"void main(void)"
"{"
" gl_Position = Position;"
"}"
);
vs.Compile();
gs.Source(
"#version 330\n"
"layout (triangles) in;"
"layout (triangle_strip, max_vertices = 48) out;"
"const vec3 LightPosition = vec3(12.0, 10.0, 7.0);"
"uniform mat4 ProjectionMatrix, CameraMatrix, ModelMatrix;"
"uniform vec2 ViewportDimensions;"
"uniform int TessLevel;"
"noperspective out vec3 geomDist;"
"flat out vec3 geomNormal;"
"out vec3 geomColor;"
"out vec3 geomLightDir;"
"void make_triangle(vec4 p0, vec4 p1, vec4 p2)"
"{"
" vec3 n0 = (ModelMatrix*vec4(p0.xyz, 0)).xyz;"
" vec3 n1 = (ModelMatrix*vec4(p1.xyz, 0)).xyz;"
" vec3 n2 = (ModelMatrix*vec4(p2.xyz, 0)).xyz;"
" vec4 m0 = ModelMatrix*p0;"
" vec4 m1 = ModelMatrix*p1;"
" vec4 m2 = ModelMatrix*p2;"
" vec4 c0 = ProjectionMatrix*CameraMatrix*m0;"
" vec4 c1 = ProjectionMatrix*CameraMatrix*m1;"
" vec4 c2 = ProjectionMatrix*CameraMatrix*m2;"
" vec2 s0 = ViewportDimensions * c0.xy/c0.w;"
" vec2 s1 = ViewportDimensions * c1.xy/c1.w;"
" vec2 s2 = ViewportDimensions * c2.xy/c2.w;"
" vec2 v0 = s2 - s1;"
" vec2 v1 = s0 - s2;"
" vec2 v2 = s1 - s0;"
" float d0 = abs(v1.x*v2.y-v1.y*v2.x)/length(v0);"
" float d1 = abs(v2.x*v0.y-v2.y*v0.x)/length(v1);"
" float d2 = abs(v0.x*v1.y-v0.y*v1.x)/length(v2);"
" geomNormal = normalize(n0+n1+n2);"
" gl_Position = c0;"
" geomColor = normalize(abs(vec3(1, 1, 1) - n0));"
" geomLightDir = LightPosition - m0.xyz;"
" geomDist = vec3(d0, 0.0, 0.0);"
" EmitVertex();"
" gl_Position = c1;"
" geomColor = normalize(abs(vec3(1, 1, 1) - n1));"
" geomLightDir = LightPosition - m1.xyz;"
" geomDist = vec3(0.0, d1, 0.0);"
" EmitVertex();"
" gl_Position = c2;"
" geomColor = normalize(abs(vec3(1, 1, 1) - n2));"
" geomLightDir = LightPosition - m2.xyz;"
" geomDist = vec3(0.0, 0.0, d2);"
" EmitVertex();"
" EndPrimitive();"
"}"
"void do_tess_1(vec4 p_0, vec4 p_1, vec4 p_2, int l)"
"{"
" if(l == 1) make_triangle(p_0, p_1, p_2);"
" else"
" {"
" vec4 p01 = vec4(normalize(p_0.xyz+p_1.xyz), 1.0);"
" vec4 p12 = vec4(normalize(p_1.xyz+p_2.xyz), 1.0);"
" vec4 p20 = vec4(normalize(p_2.xyz+p_0.xyz), 1.0);"
" make_triangle(p_0, p01, p20);"
" make_triangle(p01, p_1, p12);"
" make_triangle(p20, p12, p_2);"
" make_triangle(p01, p12, p20);"
" }"
"}"
"void do_tess_0(vec4 p_0, vec4 p_1, vec4 p_2, int l)"
"{"
" if(l == 0) make_triangle(p_0, p_1, p_2);"
" else"
" {"
" vec4 p01 = vec4(normalize(p_0.xyz+p_1.xyz), 1.0);"
" vec4 p12 = vec4(normalize(p_1.xyz+p_2.xyz), 1.0);"
" vec4 p20 = vec4(normalize(p_2.xyz+p_0.xyz), 1.0);"
" do_tess_1(p_0, p01, p20, l);"
" do_tess_1(p01, p_1, p12, l);"
" do_tess_1(p20, p12, p_2, l);"
" do_tess_1(p01, p12, p20, l);"
" }"
"}"
"void main(void)"
"{"
" do_tess_0("
" gl_in[0].gl_Position,"
" gl_in[1].gl_Position,"
" gl_in[2].gl_Position,"
" TessLevel"
" );"
"}"
);
gs.Compile();
fs.Source(
"#version 330\n"
"noperspective in vec3 geomDist;"
"flat in vec3 geomNormal;"
"in vec3 geomColor;"
"in vec3 geomLightDir;"
"out vec3 fragColor;"
"void main(void)"
"{"
" float MinDist = min(min(geomDist.x,geomDist.y),geomDist.z);"
" float EdgeAlpha = exp2(-pow(MinDist, 2.0));"
" const float Ambient = 0.7;"
" float Diffuse = max(dot("
" normalize(geomNormal),"
" normalize(geomLightDir)"
" )+0.1, 0.0)*1.4;"
" vec3 FaceColor = geomColor * (Diffuse + Ambient);"
" const vec3 EdgeColor = vec3(0.0, 0.0, 0.0);"
" fragColor = mix(FaceColor, EdgeColor, EdgeAlpha);"
"}"
);
fs.Compile();
prog.AttachShader(vs);
prog.AttachShader(gs);
prog.AttachShader(fs);
prog.Link();
prog.Use();
shape.Bind();
verts.Bind(Buffer::Target::Array);
{
std::vector<GLfloat> data;
GLuint n_per_vertex = make_shape.Positions(data);
Buffer::Data(Buffer::Target::Array, data);
VertexAttribArray attr(prog, "Position");
attr.Setup<GLfloat>(n_per_vertex);
attr.Enable();
indices.Bind(Buffer::Target::ElementArray);
Buffer::Data(Buffer::Target::ElementArray, shape_indices);
shape_indices.clear();
}
//
gl.ClearColor(0.7f, 0.7f, 0.7f, 0.0f);
gl.ClearDepth(1.0f);
gl.Enable(Capability::DepthTest);
prog.Use();
}
ReflectionExample(void)
: torus_indices(make_torus.Indices())
, torus_instr(make_torus.Instructions())
, vs_norm(ObjectDesc("Vertex-Normal"))
, vs_refl(ObjectDesc("Vertex-Reflection"))
, gs_refl(ObjectDesc("Geometry-Reflection"))
{
namespace se = oglplus::smart_enums;
// Set the normal object vertex shader source
vs_norm.Source(
"#version 330\n"
"in vec4 Position;"
"in vec3 Normal;"
"out vec3 geomColor;"
"out vec3 geomNormal;"
"out vec3 geomLight;"
"uniform mat4 ProjectionMatrix, CameraMatrix, ModelMatrix;"
"uniform vec3 LightPos;"
"void main(void)"
"{"
" gl_Position = ModelMatrix * Position;"
" geomColor = Normal;"
" geomNormal = mat3(ModelMatrix)*Normal;"
" geomLight = LightPos-gl_Position.xyz;"
" gl_Position = ProjectionMatrix * CameraMatrix * gl_Position;"
"}"
);
// compile it
vs_norm.Compile();
// Set the reflected object vertex shader source
// which just passes data to the geometry shader
vs_refl.Source(
"#version 330\n"
"in vec4 Position;"
"in vec3 Normal;"
"out vec3 vertNormal;"
"void main(void)"
"{"
" gl_Position = Position;"
" vertNormal = Normal;"
"}"
);
// compile it
vs_refl.Compile();
// Set the reflected object geometry shader source
// This shader creates a reflection matrix that
// relies on the fact that the reflection is going
// to be done by the y-plane
gs_refl.Source(
"#version 330\n"
"layout(triangles) in;"
"layout(triangle_strip, max_vertices = 6) out;"
"in vec3 vertNormal[];"
"uniform mat4 ProjectionMatrix;"
"uniform mat4 CameraMatrix;"
"uniform mat4 ModelMatrix;"
"out vec3 geomColor;"
"out vec3 geomNormal;"
"out vec3 geomLight;"
"uniform vec3 LightPos;"
"mat4 ReflectionMatrix = mat4("
" 1.0, 0.0, 0.0, 0.0,"
" 0.0,-1.0, 0.0, 0.0,"
" 0.0, 0.0, 1.0, 0.0,"
" 0.0, 0.0, 0.0, 1.0 "
");"
"void main(void)"
"{"
" for(int v=0; v!=gl_in.length(); ++v)"
" {"
" vec4 Position = gl_in[v].gl_Position;"
" gl_Position = ModelMatrix * Position;"
" geomColor = vertNormal[v];"
" geomNormal = mat3(ModelMatrix)*vertNormal[v];"
" geomLight = LightPos - gl_Position.xyz;"
" gl_Position = "
" ProjectionMatrix *"
" CameraMatrix *"
" ReflectionMatrix *"
" gl_Position;"
" EmitVertex();"
" }"
" EndPrimitive();"
"}"
);
// compile it
gs_refl.Compile();
// set the fragment shader source
fs.Source(
"#version 330\n"
"in vec3 geomColor;"
"in vec3 geomNormal;"
"in vec3 geomLight;"
"out vec4 fragColor;"
"void main(void)"
"{"
" float l = length(geomLight);"
" float d = l > 0.0 ? dot("
" geomNormal, "
" normalize(geomLight)"
" ) / l : 0.0;"
" float i = 0.2 + max(d, 0.0) * 2.0;"
" fragColor = vec4(abs(geomNormal)*i, 1.0);"
"}"
);
// compile it
fs.Compile();
// attach the shaders to the normal rendering program
prog_norm.AttachShader(vs_norm);
prog_norm.AttachShader(fs);
// link it
prog_norm.Link();
// attach the shaders to the reflection rendering program
prog_refl.AttachShader(vs_refl);
prog_refl.AttachShader(gs_refl);
prog_refl.AttachShader(fs);
// link it
prog_refl.Link();
// bind the VAO for the torus
torus.Bind();
// bind the VBO for the torus vertices
torus_verts.Bind(se::Array());
{
std::vector<GLfloat> data;
GLuint n_per_vertex = make_torus.Positions(data);
// upload the data
Buffer::Data(se::Array(), data);
// setup the vertex attribs array for the vertices
typedef VertexAttribArray VAA;
VertexAttribSlot
loc_norm = VAA::GetLocation(prog_norm, "Position"),
loc_refl = VAA::GetLocation(prog_refl, "Position");
assert(loc_norm == loc_refl);
VertexAttribArray attr(loc_norm);
attr.Setup<GLfloat>(n_per_vertex);
attr.Enable();
}
// bind the VBO for the torus normals
torus_normals.Bind(se::Array());
{
std::vector<GLfloat> data;
GLuint n_per_vertex = make_torus.Normals(data);
// upload the data
Buffer::Data(se::Array(), data);
// setup the vertex attribs array for the normals
typedef VertexAttribArray VAA;
VertexAttribSlot
loc_norm = VAA::GetLocation(prog_norm, "Normal"),
loc_refl = VAA::GetLocation(prog_refl, "Normal");
assert(loc_norm == loc_refl);
VertexAttribArray attr(loc_norm);
attr.Setup<GLfloat>(n_per_vertex);
attr.Enable();
}
// bind the VAO for the plane
plane.Bind();
// bind the VBO for the plane vertices
plane_verts.Bind(se::Array());
{
GLfloat data[4*3] = {
-2.0f, 0.0f, 2.0f,
-2.0f, 0.0f, -2.0f,
2.0f, 0.0f, 2.0f,
2.0f, 0.0f, -2.0f
};
// upload the data
Buffer::Data(se::Array(), 4*3, data);
// setup the vertex attribs array for the vertices
prog_norm.Use();
VertexAttribArray attr(prog_norm, "Position");
attr.Setup<Vec3f>();
attr.Enable();
}
// bind the VBO for the torus normals
plane_normals.Bind(se::Array());
{
GLfloat data[4*3] = {
-0.1f, 1.0f, 0.1f,
-0.1f, 1.0f, -0.1f,
0.1f, 1.0f, 0.1f,
0.1f, 1.0f, -0.1f
};
// upload the data
Buffer::Data(se::Array(), 4*3, data);
// setup the vertex attribs array for the normals
prog_norm.Use();
VertexAttribArray attr(prog_norm, "Normal");
attr.Setup<Vec3f>();
attr.Enable();
}
VertexArray::Unbind();
Vec3f lightPos(2.0f, 2.0f, 3.0f);
prog_norm.Use();
SetUniform(prog_norm, "LightPos", lightPos);
prog_refl.Use();
SetUniform(prog_refl, "LightPos", lightPos);
//
gl.ClearColor(0.2f, 0.2f, 0.2f, 0.0f);
gl.ClearDepth(1.0f);
gl.ClearStencil(0);
}
static Program make(void)
{
VertexShader vs;
vs.Source(
"#version 330\n"
"uniform mat4 LightMatrix, ModelMatrix;"
"uniform vec3 LightPosition;"
"uniform vec3 CameraPosition;"
"in vec4 Position;"
"out vec4 vertDepthCoord;"
"out vec3 vertLightDir;"
"out vec3 vertViewDir;"
"void main(void)"
"{"
" gl_Position = ModelMatrix * Position;"
" vertDepthCoord = LightMatrix * gl_Position;"
" vertLightDir = LightPosition - gl_Position.xyz;"
" vertViewDir = CameraPosition - gl_Position.xyz;"
"}"
).Compile();
GeometryShader gs;
gs.Source(
"#version 330\n"
"layout (triangles) in;"
"layout (triangle_strip, max_vertices=3) out;"
"uniform mat4 CameraMatrix;"
"in vec4 vertDepthCoord[3];"
"in vec3 vertLightDir[3];"
"in vec3 vertViewDir[3];"
"out vec4 geomDepthCoord;"
"out vec3 geomLightDir;"
"out vec3 geomViewDir;"
"out vec3 geomNormal;"
"void main(void)"
"{"
" geomNormal = normalize("
" cross("
" gl_in[1].gl_Position.xyz-"
" gl_in[0].gl_Position.xyz,"
" gl_in[2].gl_Position.xyz-"
" gl_in[0].gl_Position.xyz "
" )"
" );"
" for(int v=0; v!=3; ++v)"
" {"
" gl_Position = CameraMatrix * gl_in[v].gl_Position;"
" geomDepthCoord = vertDepthCoord[v];"
" geomLightDir = vertLightDir[v];"
" geomViewDir = vertViewDir[v];"
" EmitVertex();"
" }"
" EndPrimitive();"
"}"
).Compile();
FragmentShader fs;
fs.Source(
"#version 330\n"
"uniform sampler2D DepthMap;"
"uniform vec2 DepthOffs[32];"
"const int DepthSamples = 32;"
"const float InvDepthSamples = 1.0 / DepthSamples;"
"in vec4 gl_FragCoord;"
"in vec4 geomDepthCoord;"
"in vec3 geomLightDir;"
"in vec3 geomViewDir;"
"in vec3 geomNormal;"
"out vec3 fragColor;"
"void main(void)"
"{"
" float LightDist = geomDepthCoord.z/geomDepthCoord.w;"
" vec3 Normal = normalize(geomNormal);"
" vec3 LightDir = normalize(geomLightDir);"
" vec3 LightRefl = reflect(-LightDir, Normal);"
" vec3 ViewDir = normalize(geomViewDir);"
" float inv_w = 1.0/geomDepthCoord.w;"
" float Depth = 0.0;"
" for(int s=0; s!=DepthSamples; ++s)"
" {"
" vec2 SampleCoord = DepthOffs[s]+geomDepthCoord.xy;"
" SampleCoord *= inv_w;"
" SampleCoord *= 0.5;"
" SampleCoord += 0.5;"
" float Sample = texture(DepthMap, SampleCoord).r;"
" if(Sample < 0.95)"
" Depth += Sample;"
" else Depth += 0.5;"
" }"
" Depth *= InvDepthSamples;"
" float Ambi = 0.15;"
" float BkLt = (dot(-LightDir, ViewDir)+3.0)*0.25;"
" float SuSS = pow(abs(Depth-LightDist), 2.0)*BkLt*1.2;"
" float Shdw = min(pow(abs(Depth-LightDist)*2.0, 8.0), 1.0);"
" float Diff = sqrt(max(dot(LightDir, Normal)+0.1, 0.0))*0.4;"
" float Spec = pow(max(dot(LightRefl, ViewDir), 0.0), 64.0);"
" vec3 Color = vec3(0.2, 0.9, 0.7);"
" fragColor = (Ambi + Shdw*Diff + SuSS) * Color;"
" fragColor += Shdw*Spec * vec3(1.0, 1.0, 1.0);"
"}"
).Compile();
Program prog;
prog << vs << gs << fs;
prog.Link().Use();
ProgramUniform<Vec2f> depth_offs(prog, "DepthOffs");
for(GLuint i=0; i!=32; ++i)
{
float u = std::rand() / float(RAND_MAX);
float v = std::rand() / float(RAND_MAX);
float x = std::sqrt(v) * std::cos(2*3.1415*u);
float y = std::sqrt(v) * std::sin(2*3.1415*u);
depth_offs[i].Set(x, y);
}
return std::move(prog);
}
static Program make_prog(void)
{
Program prog;
VertexShader vs;
vs.Source(StrCRef(
"#version 330\n"
"in vec3 Position;"
"in vec2 TexCoord;"
"out vec2 vertTexCoord;"
"void main(void)"
"{"
" gl_Position = vec4(Position, 1.0);"
" vertTexCoord = TexCoord;"
"}"
)).Compile();
prog.AttachShader(vs);
GeometryShader gs;
gs.Source(StrCRef(
"#version 330\n"
"#extension GL_ARB_gpu_shader5 : enable\n"
"layout(triangles, invocations = 7) in;"
"layout(triangle_strip, max_vertices = 21) out;"
"uniform mat4 ProjectionMatrix, CameraMatrix;"
"mat4 Matrix = ProjectionMatrix * CameraMatrix;"
"uniform vec3 CameraPosition;"
"in vec2 vertTexCoord[3];"
"out gl_PerVertex {"
" vec4 gl_Position;"
" float gl_ClipDistance[3];"
"};"
"flat out mat3 geomPositionFront;"
"flat out mat3 geomTexCoordFront;"
"flat out vec3 geomWFront;"
"noperspective out vec3 geomBarycentric;"
"out vec3 geomPosition;"
"out vec3 geomTexCoord;"
"void main(void)"
"{"
" vec4 world_pos[8*3];"
" vec3 tex_coord[8*3];"
" vec4 view_pos[8*3];"
" vec3 screen_pos[8*3];"
" bool front_facing[8];"
" int ft = gl_InvocationID+1;"
" for(int pass=0; pass!=2; ++pass)"
" {"
" bool first = pass == 0;"
" if(((ft == 0) && first) || (((ft != 0) && !first)))"
" {"
" for(int v=0; v!=3; ++v)"
" {"
" int w = 2-v;"
" world_pos[0+v] = gl_in[w].gl_Position;"
" tex_coord[0+v] = vec3(vertTexCoord[w], 0.0);"
" }"
" }"
" vec4 n = vec4(-0.15 * normalize(cross("
" gl_in[1].gl_Position.xyz-gl_in[0].gl_Position.xyz,"
" gl_in[2].gl_Position.xyz-gl_in[0].gl_Position.xyz "
" )), 0.0);"
" if(((ft == 1) && first) || (((ft != 1) && !first)))"
" {"
" for(int v=0; v!=3; ++v)"
" {"
" world_pos[3+v] = gl_in[v].gl_Position + n;"
" tex_coord[3+v] = vec3(vertTexCoord[v], 1.0);"
" }"
" }"
" for(int v=0; v!=3; ++v)"
" {"
" int w = (v+1)%3;"
" int k = 2+2*v;"
" if(((ft == k) && first) || (((ft != k) && !first)))"
" {"
" world_pos[6+0+v*6] = gl_in[v].gl_Position;"
" tex_coord[6+0+v*6] = vec3(vertTexCoord[v], 0.0);"
" world_pos[6+1+v*6] = gl_in[w].gl_Position;"
" tex_coord[6+1+v*6] = vec3(vertTexCoord[w], 0.0);"
" world_pos[6+2+v*6] = gl_in[v].gl_Position + n;"
" tex_coord[6+2+v*6] = vec3(vertTexCoord[v], 1.0);"
" }"
" k = 3+2*v;"
" if(((ft == k) && first) || (((ft != k) && !first)))"
" {"
" world_pos[6+3+v*6] = gl_in[w].gl_Position;"
" tex_coord[6+3+v*6] = vec3(vertTexCoord[w], 0.0);"
" world_pos[6+4+v*6] = gl_in[w].gl_Position + n;"
" tex_coord[6+4+v*6] = vec3(vertTexCoord[w], 1.0);"
" world_pos[6+5+v*6] = gl_in[v].gl_Position + n;"
" tex_coord[6+5+v*6] = vec3(vertTexCoord[v], 1.0);"
" }"
" }"
" for(int t=first?ft:0; t!=8; ++t)"
" {"
" if(!first && (t == ft)) continue;"
" int o = t*3;"
" for(int v=0; v!=3; ++v)"
" {"
" int w = o+v;"
" view_pos[w] = Matrix * world_pos[w];"
" screen_pos[w] = view_pos[w].xyz/view_pos[w].w;"
" }"
" front_facing[t] = cross("
" screen_pos[o+1]-screen_pos[o+0],"
" screen_pos[o+2]-screen_pos[o+0] "
" ).z < 0.0;"
" if(first) break;"
" }"
" if(first && !front_facing[ft]) return;"
" }"
" int o = ft*3;"
" vec4 clip_plane[3];"
" for(int v=0; v!=3; ++v)"
" {"
" int w = (v+1)%3;"
" vec3 p0 = world_pos[o+v].xyz;"
" vec3 p1 = world_pos[o+w].xyz;"
" vec3 p2 = CameraPosition;"
" vec3 pv = normalize(cross(p1-p0, p2-p0));"
" clip_plane[v] = vec4(pv, -dot(pv, p0));"
" }"
" vec3 lo = CameraPosition;"
" vec3 p0 = world_pos[o+0].xyz;"
" vec3 pu = world_pos[o+1].xyz-p0;"
" vec3 pv = world_pos[o+2].xyz-p0;"
" vec3 lp = lo-p0;"
" float w0 = view_pos[o+0].w;"
" float wu = view_pos[o+1].w-w0;"
" float wv = view_pos[o+2].w-w0;"
" vec3 t0 = tex_coord[o+0];"
" vec3 tu = tex_coord[o+1]-t0;"
" vec3 tv = tex_coord[o+2]-t0;"
" for(int bt=0; bt!=8; ++bt)"
" {"
" int k = bt*3;"
" if((ft != bt) && !front_facing[bt])"
" {"
" for(int v=0; v!=3; ++v)"
" {"
" vec3 lt = world_pos[k+v].xyz;"
" mat3 im = mat3(lo-lt, pu, pv);"
" vec3 ic = inverse(im)*lp;"
" float s = ic.y;"
" float t = ic.z;"
" geomPositionFront[v] = p0+pu*s+pv*t;"
" geomTexCoordFront[v] = t0+tu*s+tv*t;"
" geomWFront[v] = w0+wu*s+wv*t;"
" }"
" for(int v=0; v!=3; ++v)"
" {"
" int w = k+v;"
" gl_Position = view_pos[w];"
" for(int c=0; c!=3; ++c)"
" {"
" gl_ClipDistance[c] = dot("
" clip_plane[c],"
" world_pos[w]"
" );"
" }"
" geomPosition = world_pos[w].xyz;"
" geomTexCoord = tex_coord[w];"
" geomBarycentric = vec3(0.0);"
" geomBarycentric[v] = 1.0;"
" EmitVertex();"
" }"
" EndPrimitive();"
" }"
" }"
"}"
)).Compile();
prog.AttachShader(gs);
FragmentShader fs;
fs.Source(StrCRef(
"#version 330\n"
"uniform float Time;"
"uniform sampler2D ColorMap;"
"uniform sampler2D BumpMap;"
"uniform vec3 LightPosition;"
"flat in mat3 geomPositionFront;"
"flat in mat3 geomTexCoordFront;"
"flat in vec3 geomWFront;"
"noperspective in vec3 geomBarycentric;"
"in vec3 geomPosition;"
"in vec3 geomTexCoord;"
"out vec3 fragColor;"
"vec3 vcdiv(vec3 a, vec3 b)"
"{"
" return vec3(a.x/b.x, a.y/b.y, a.z/b.z);"
"}"
"void main(void)"
"{"
" const vec3 one = vec3(1.0, 1.0, 1.0);"
" vec3 bzfv = vcdiv(geomBarycentric,geomWFront);"
" vec3 p0 = geomPosition;"
" vec3 p1 = (geomPositionFront*bzfv)/dot(one,bzfv);"
" vec3 tc0 = geomTexCoord;"
" vec3 tc1 = (geomTexCoordFront*bzfv)/dot(one,bzfv);"
" ivec2 ts = textureSize(BumpMap, 0);"
" int mts = max(ts.x, ts.y);"
" vec2 dtc = tc1.xy - tc0.xy;"
" float mdtc = max(abs(dtc.x), abs(dtc.y));"
" int nsam = max(min(int(mdtc*mts), mts/2), 1);"
" float step = 1.0 / nsam;"
" for(int s=0; s<=nsam; ++s)"
" {"
" vec3 tc = mix(tc1, tc0, s*step);"
" vec4 bm = texture(BumpMap, tc.xy);"
" if(tc.z <= bm.w)"
" {"
" vec3 p = mix(p1, p0, s*step);"
" vec3 ldir = normalize(LightPosition - p);"
" float l = max(dot(ldir, bm.xzy), 0.0)*1.3;"
" fragColor = texture(ColorMap, tc.xy).rgb*l;"
" return;"
" }"
" }"
" discard;"
"}"
)).Compile();
prog.AttachShader(fs);
prog.Link();
prog.Use();
return prog;
}
static Program make(void)
{
VertexShader vs;
vs.Source(
"#version 150\n"
"uniform mat4 ModelMatrix;"
"uniform vec3 LightPosition;"
"uniform vec3 CameraPosition;"
"in vec4 Position;"
"out vec3 vertLightDir;"
"out vec3 vertViewDir;"
"void main(void)"
"{"
" gl_Position = ModelMatrix * Position;"
" vertLightDir = LightPosition - gl_Position.xyz;"
" vertViewDir = CameraPosition - gl_Position.xyz;"
"}"
).Compile();
GeometryShader gs;
gs.Source(
"#version 150\n"
"layout (triangles) in;"
"layout (triangle_strip, max_vertices=3) out;"
"uniform mat4 CameraMatrix;"
"in vec3 vertLightDir[3];"
"in vec3 vertViewDir[3];"
"out vec3 geomLightDir;"
"out vec3 geomViewDir;"
"out vec3 geomNormal;"
"void main(void)"
"{"
" geomNormal = normalize("
" cross("
" gl_in[1].gl_Position.xyz-"
" gl_in[0].gl_Position.xyz,"
" gl_in[2].gl_Position.xyz-"
" gl_in[0].gl_Position.xyz "
" )"
" );"
" for(int v=0; v!=3; ++v)"
" {"
" gl_Position = CameraMatrix * gl_in[v].gl_Position;"
" geomLightDir = vertLightDir[v];"
" geomViewDir = vertViewDir[v];"
" EmitVertex();"
" }"
" EndPrimitive();"
"}"
).Compile();
FragmentShader fs;
fs.Source(
"#version 150\n"
"in vec3 geomLightDir;"
"in vec3 geomViewDir;"
"in vec3 geomNormal;"
"out vec4 fragColor;"
"void main(void)"
"{"
" vec3 Normal = normalize(geomNormal);"
" vec3 LightDir = normalize(geomLightDir);"
" vec3 LightRefl = reflect(-LightDir, Normal);"
" vec3 ViewDir = normalize(geomViewDir);"
" fragColor = vec4("
" clamp(dot(Normal, ViewDir), 0, 1),"
" clamp(dot(Normal, LightDir),0, 1),"
" clamp(dot(ViewDir, LightRefl), 0, 1),"
" gl_FragCoord.z"
" );"
"}"
).Compile();
Program prog(ObjectDesc("Data"));
prog << vs << gs << fs;
prog.Link().Use();
return std::move(prog);
}
TorusExample(void)
: make_torus(1.0, 0.5, 18, 36)
, torus_instr(make_torus.Instructions())
, torus_indices(make_torus.Indices())
, vs(ObjectDesc("Vertex"))
, gs(ObjectDesc("Geometry"))
, face_fs(ObjectDesc("Face fragment"))
, frame_fs(ObjectDesc("Frame fragment"))
, transf_prog(ObjectDesc("Transformation"))
, face_prog(ObjectDesc("Face"))
, frame_prog(ObjectDesc("Frame"))
, projection_matrix(transf_prog, "ProjectionMatrix")
, camera_matrix(transf_prog, "CameraMatrix")
, model_matrix(transf_prog, "ModelMatrix")
, transf_time(transf_prog, "Time")
{
vs.Source(
"#version 330\n"
"uniform mat4 ModelMatrix;"
"in vec4 Position;"
"in vec3 Normal;"
"in vec2 TexCoord;"
"out gl_PerVertex {"
" vec4 gl_Position;"
"};"
"out vec3 vertNormal;"
"out vec2 vertTexCoord;"
"void main(void)"
"{"
" gl_Position = ModelMatrix * Position;"
" vertNormal = (ModelMatrix*vec4(Normal,0.0)).xyz;"
" vertTexCoord = TexCoord;"
"}"
);
vs.Compile();
gs.Source(
"#version 330\n"
"layout(triangles) in;"
"layout(triangle_strip, max_vertices = 15) out;"
"uniform mat4 CameraMatrix, ProjectionMatrix;"
"uniform vec3 LightPos;"
"uniform float Time;"
"in gl_PerVertex {"
" vec4 gl_Position;"
"} gl_in[];"
"in vec3 vertNormal[];"
"in vec2 vertTexCoord[];"
"out gl_PerVertex {"
" vec4 gl_Position;"
"};"
"out vec3 geomNormal;"
"out vec3 geomLight;"
"out float geomGlow;"
"flat out int geomTop;"
"void main(void)"
"{"
" vec3 FaceNormal = normalize("
" vertNormal[0]+"
" vertNormal[1]+"
" vertNormal[2] "
" );"
" vec2 FaceCoord = 0.33333 * ("
" vertTexCoord[0]+"
" vertTexCoord[1]+"
" vertTexCoord[2] "
" );"
" float Offs = (sin((FaceCoord.s + Time/10.0)* 3.14 * 2.0 * 10)*0.5 + 0.5)*0.4;"
" Offs *= cos(FaceCoord.t * 3.1415 * 2.0)*0.5 + 0.51;"
" vec3 pos[3], norm[3];"
" for(int i=0; i!=3; ++i)"
" pos[i] = gl_in[i].gl_Position.xyz;"
" for(int i=0; i!=3; ++i)"
" norm[i] = cross("
" FaceNormal, "
" normalize(pos[(i+1)%3] - pos[i])"
" );"
" vec3 pofs = FaceNormal * Offs;"
" geomTop = 0;"
" for(int i=0; i!=3; ++i)"
" {"
" geomNormal = norm[i];"
" for(int j=0; j!=2; ++j)"
" {"
" vec3 tpos = pos[(i+j)%3];"
" geomLight = LightPos-tpos;"
" geomGlow = 1.0;"
" gl_Position = "
" ProjectionMatrix *"
" CameraMatrix *"
" vec4(tpos, 1.0);"
" EmitVertex();"
" geomGlow = 0.7;"
" geomLight = LightPos-tpos+pofs;"
" gl_Position = "
" ProjectionMatrix *"
" CameraMatrix *"
" vec4(tpos + pofs, 1.0);"
" EmitVertex();"
" }"
" EndPrimitive();"
" }"
" geomGlow = 0.0;"
" geomTop = 1;"
" for(int i=0; i!=3; ++i)"
" {"
" geomLight = LightPos - (pos[i]+pofs);"
" geomNormal = vertNormal[i];"
" gl_Position = "
" ProjectionMatrix *"
" CameraMatrix *"
" vec4(pos[i] + pofs, 1.0);"
" EmitVertex();"
" }"
" EndPrimitive();"
"}"
);
gs.Compile();
transf_prog.AttachShader(vs);
transf_prog.AttachShader(gs);
transf_prog.MakeSeparable();
transf_prog.Link();
transf_prog.Use();
ProgramUniform<Vec3f>(transf_prog, "LightPos").Set(4, 4, -8);
torus.Bind();
verts.Bind(Buffer::Target::Array);
{
std::vector<GLfloat> data;
GLuint n_per_vertex = make_torus.Positions(data);
Buffer::Data(Buffer::Target::Array, data);
VertexAttribArray attr(transf_prog, "Position");
attr.Setup(n_per_vertex, DataType::Float);
attr.Enable();
}
normals.Bind(Buffer::Target::Array);
{
std::vector<GLfloat> data;
GLuint n_per_vertex = make_torus.Normals(data);
Buffer::Data(Buffer::Target::Array, data);
VertexAttribArray attr(transf_prog, "Normal");
attr.Setup(n_per_vertex, DataType::Float);
attr.Enable();
}
texcoords.Bind(Buffer::Target::Array);
{
std::vector<GLfloat> data;
GLuint n_per_vertex = make_torus.TexCoordinates(data);
Buffer::Data(Buffer::Target::Array, data);
VertexAttribArray attr(transf_prog, "TexCoord");
attr.Setup(n_per_vertex, DataType::Float);
attr.Enable();
}
face_fs.Source(
"#version 330\n"
"in vec3 geomNormal;"
"in vec3 geomLight;"
"in float geomGlow;"
"flat in int geomTop;"
"uniform vec3 TopColor, SideColor;"
"const vec3 LightColor = vec3(1.0, 1.0, 1.0);"
"out vec4 fragColor;"
"void main(void)"
"{"
" float d = max(dot("
" normalize(geomLight),"
" normalize(geomNormal)"
" ), 0.0);"
" vec3 color;"
" if(geomTop != 0)"
" {"
" color = TopColor * d +"
" LightColor * pow(d, 8.0);"
" }"
" else"
" {"
" color = SideColor * geomGlow +"
" LightColor *"
" pow(d, 2.0) * 0.2;"
" }"
" fragColor = vec4(color, 1.0);"
"}"
);
face_fs.Compile();
face_prog.AttachShader(face_fs);
face_prog.MakeSeparable();
face_prog.Link();
ProgramUniform<Vec3f>(face_prog, "TopColor").Set(0.2f, 0.2f, 0.2f);
ProgramUniform<Vec3f>(face_prog, "SideColor").Set(0.9f, 0.9f, 0.2f);
face_pp.Bind();
face_prog.Use();
face_pp.UseStages(transf_prog).Vertex().Geometry();
face_pp.UseStages(face_prog).Fragment();
frame_fs.Source(
"#version 330\n"
"out vec4 fragColor;"
"void main(void)"
"{"
" fragColor = vec4(0.2, 0.1, 0.0, 1.0);"
"}"
);
frame_fs.Compile();
frame_prog.AttachShader(frame_fs);
frame_prog.MakeSeparable();
frame_prog.Link();
frame_pp.Bind();
frame_prog.Use();
frame_pp.UseStages(transf_prog).Vertex().Geometry();
frame_pp.UseStages(frame_prog).Fragment();
ProgramPipeline::Unbind();
Program::UseNone();
gl.ClearColor(0.7f, 0.6f, 0.5f, 0.0f);
gl.ClearDepth(1.0f);
gl.Enable(Capability::DepthTest);
gl.DepthFunc(CompareFn::Less);
gl.FrontFace(make_torus.FaceWinding());
}
static Program make_transf_prog(void)
{
VertexShader vs;
vs.Source(
"#version 330\n"
"uniform mat4 ModelMatrix;"
"in vec4 Position;"
"in vec3 Normal;"
"in vec2 TexCoord;"
"out gl_PerVertex {"
" vec4 gl_Position;"
"};"
"out vec3 vertNormal;"
"out vec2 vertTexCoord;"
"void main(void)"
"{"
" gl_Position = ModelMatrix * Position;"
" vertNormal = (ModelMatrix*vec4(Normal,0.0)).xyz;"
" vertTexCoord = TexCoord;"
"}"
);
vs.Compile();
GeometryShader gs;
gs.Source(
"#version 330\n"
"layout(triangles) in;"
"layout(triangle_strip, max_vertices = 15) out;"
"uniform mat4 CameraMatrix, ProjectionMatrix;"
"uniform vec3 LightPos;"
"uniform float Time;"
"in gl_PerVertex {"
" vec4 gl_Position;"
"} gl_in[];"
"in vec3 vertNormal[];"
"in vec2 vertTexCoord[];"
"out gl_PerVertex {"
" vec4 gl_Position;"
"};"
"out vec3 geomNormal;"
"out vec3 geomLight;"
"out float geomGlow;"
"flat out int geomTop;"
"void main(void)"
"{"
" vec3 FaceNormal = normalize("
" vertNormal[0]+"
" vertNormal[1]+"
" vertNormal[2] "
" );"
" vec2 FaceCoord = 0.33333 * ("
" vertTexCoord[0]+"
" vertTexCoord[1]+"
" vertTexCoord[2] "
" );"
" float Offs = (sin((FaceCoord.s + Time/10.0)* 3.14 * 2.0 * 10)*0.5 + 0.5)*0.4;"
" Offs *= cos(FaceCoord.t * 3.1415 * 2.0)*0.5 + 0.51;"
" vec3 pos[3], norm[3];"
" for(int i=0; i!=3; ++i)"
" pos[i] = gl_in[i].gl_Position.xyz;"
" for(int i=0; i!=3; ++i)"
" norm[i] = cross("
" FaceNormal, "
" normalize(pos[(i+1)%3] - pos[i])"
" );"
" vec3 pofs = FaceNormal * Offs;"
" geomTop = 0;"
" for(int i=0; i!=3; ++i)"
" {"
" geomNormal = norm[i];"
" for(int j=0; j!=2; ++j)"
" {"
" vec3 tpos = pos[(i+j)%3];"
" geomLight = LightPos-tpos;"
" geomGlow = 1.0;"
" gl_Position = "
" ProjectionMatrix *"
" CameraMatrix *"
" vec4(tpos, 1.0);"
" EmitVertex();"
" geomGlow = 0.7;"
" geomLight = LightPos-tpos+pofs;"
" gl_Position = "
" ProjectionMatrix *"
" CameraMatrix *"
" vec4(tpos + pofs, 1.0);"
" EmitVertex();"
" }"
" EndPrimitive();"
" }"
" geomGlow = 0.0;"
" geomTop = 1;"
" for(int i=0; i!=3; ++i)"
" {"
" geomLight = LightPos - (pos[i]+pofs);"
" geomNormal = vertNormal[i];"
" gl_Position = "
" ProjectionMatrix *"
" CameraMatrix *"
" vec4(pos[i] + pofs, 1.0);"
" EmitVertex();"
" }"
" EndPrimitive();"
"}"
);
gs.Compile();
Program prog;
prog.AttachShader(vs);
prog.AttachShader(gs);
prog.MakeSeparable();
prog.Link();
ProgramUniform<Vec3f>(prog, "LightPos").Set(4, 4, -8);
return prog;
}
TorusExample(void)
: make_torus(1.0, 0.5, 12, 12)
, torus_instr(make_torus.Instructions())
, torus_indices(make_torus.Indices())
, projection_matrix(prog, "ProjectionMatrix")
, camera_matrix(prog, "CameraMatrix")
, model_matrix(prog, "ModelMatrix")
, light_pos_cam(prog, "LightPosCam")
, front_color(prog, "FrontColor")
, back_color(prog, "BackColor")
{
vs.Source(
"#version 330\n"
"uniform mat4 ModelMatrix, CameraMatrix;"
"in vec4 Position;"
"void main(void)"
"{"
" gl_Position = CameraMatrix *"
" ModelMatrix * Position;"
"}"
);
vs.Compile();
gs.Source(
"#version 330\n"
"layout(triangles) in;"
"layout(triangle_strip, max_vertices = 8) out;"
"uniform mat4 ProjectionMatrix;"
"uniform vec4 LightPosCam;"
"out vec3 geomLightDir;"
"out float geomOpacity;"
"void main(void)"
"{"
" vec4 c = vec4(("
" gl_in[0].gl_Position.xyz+"
" gl_in[1].gl_Position.xyz+"
" gl_in[2].gl_Position.xyz "
" ) * 0.333333, 1.0);"
" for(int v = 0; v != 4; ++v)"
" {"
" vec4 b = gl_in[v%3].gl_Position;"
" vec4 a = vec4("
" b.xyz + (c.xyz - b.xyz)*0.3,"
" 1.0"
" );"
" gl_Position = ProjectionMatrix * a;"
" geomLightDir = (LightPosCam - a).xyz;"
" geomOpacity = 1.0;"
" EmitVertex();"
" gl_Position = ProjectionMatrix * b;"
" geomLightDir = (LightPosCam - b).xyz;"
" geomOpacity = 0.0;"
" EmitVertex();"
" }"
" EndPrimitive();"
"}"
);
gs.Compile();
fs.Source(
"#version 330\n"
"in vec3 geomLightDir;"
"in float geomOpacity;"
"uniform vec3 FrontColor, BackColor;"
"out vec4 fragColor;"
"void main(void)"
"{"
" float l = length(geomLightDir);"
" vec3 color = gl_FrontFacing?"
" FrontColor:"
" BackColor;"
" fragColor = vec4(color*(4.0/l), geomOpacity);"
"}"
);
fs.Compile();
prog.AttachShader(vs);
prog.AttachShader(gs);
prog.AttachShader(fs);
prog.Link();
torus.Bind();
verts.Bind(Buffer::Target::Array);
{
std::vector<GLfloat> data;
GLuint n_per_vertex = make_torus.Positions(data);
Buffer::Data(Buffer::Target::Array, data);
prog.Use();
VertexAttribArray attr(prog, "Position");
attr.Setup(n_per_vertex, DataType::Float);
attr.Enable();
}
gl.ClearColor(0.8f, 0.7f, 0.6f, 0.0f);
gl.ClearDepth(1.0f);
gl.Enable(Capability::DepthTest);
gl.DepthFunc(CompareFn::LEqual);
gl.FrontFace(make_torus.FaceWinding());
}
static Program make(void)
{
Program prog;
VertexShader vs;
vs.Source(
"#version 330\n"
"in vec4 Position;"
"in ivec3 TexCoord;"
"out ivec3 vertTexCoord;"
"void main(void)"
"{"
" gl_Position = Position;"
" vertTexCoord = TexCoord;"
"}"
).Compile();
prog.AttachShader(vs);
GeometryShader gs;
gs.Source(
"#version 330\n"
"layout (points) in;"
"layout (triangle_strip, max_vertices=24) out;"
"uniform float FadeCoef;"
"uniform sampler3D Pattern, FadeMap;"
"uniform mat4 ProjectionMatrix, CameraMatrix;"
"mat4 Matrix = ProjectionMatrix*CameraMatrix;"
"uniform vec3 LightPosition = vec3(100, 120, 150);"
"in ivec3 vertTexCoord[1];"
"out vec3 geomNormal;"
"out vec3 geomLightDir;"
"out vec3 geomTexCoord;"
"out float geomShadow;"
"float get_cell(ivec3 offs)"
"{"
" ivec3 coord = vertTexCoord[0]+offs;"
" float patt = texelFetch(Pattern, coord, 0).r;"
" float fade = texelFetch(FadeMap, coord, 0).r;"
" return clamp("
" (patt != 0.0)?"
" (FadeCoef-fade)*256.0:"
" 0.0, 0.0, 1.0"
" );"
"}"
"const ivec3 coffs[6] = ivec3[6]("
" ivec3(+1, 0, 0),"
" ivec3(-1, 0, 0),"
" ivec3( 0,+1, 0),"
" ivec3( 0,-1, 0),"
" ivec3( 0, 0,+1),"
" ivec3( 0, 0,-1) "
");"
"const mat3 tmats[6] = mat3[6]("
" mat3( 0, 0, 1, 0,-1, 0, 1, 0, 0),"
" mat3( 0, 0,-1, 0,-1, 0, -1, 0, 0),"
" mat3(-1, 0, 0, 0, 0, 1, 0, 1, 0),"
" mat3(-1, 0, 0, 0, 0,-1, 0,-1, 0),"
" mat3( 1, 0, 0, 0, 1, 0, 0, 0, 1),"
" mat3(-1, 0, 0, 0, 1, 0, 0, 0,-1) "
");"
"const vec3[8] nvec = vec3[8]("
" vec3( 0,-1,+1),"
" vec3(+1,-1,+1),"
" vec3(+1, 0,+1),"
" vec3(+1,+1,+1),"
" vec3( 0,+1,+1),"
" vec3(-1,+1,+1),"
" vec3(-1, 0,+1),"
" vec3(-1,-1,+1) "
");"
"void main(void)"
"{"
" float cc = get_cell(ivec3(0,0,0));"
" if(cc > 0.0)"
" {"
" float c05 = 0.5*cc;"
" float c0 = 0.5-c05;"
" float c1 = 0.5+c05;"
" for(int f=0; f!=6; ++f)"
" if(get_cell(coffs[f]) < 1.0)"
" {"
" int config = 0x0;"
" vec3 noffs[8];"
" vec3 nml = tmats[f][2];"
" float aoc = get_cell(ivec3(nml*2));"
" aoc += 0.8*get_cell(ivec3(nml*3));"
" for(int n=0; n!=8; ++n)"
" {"
" noffs[n] = nvec[n]*tmats[f];"
" float nc = get_cell(ivec3(noffs[n]));"
" aoc += 0.2*get_cell(ivec3(noffs[n]+nml));"
" aoc += 0.1*get_cell(ivec3(noffs[n]+nml*2));"
" config |= (nc>0.0)?0x1<<n:0x0;"
" }"
" float aom = float(config);"
" geomNormal = tmats[f][2];"
" geomShadow = max(1.0-sqrt(aoc), 0.0);"
" vec3 cpos = gl_in[0].gl_Position.xyz;"
" gl_Position = vec4(cpos+noffs[7]*c05, 1.0);"
" geomLightDir = LightPosition - gl_Position.xyz;"
" gl_Position = Matrix * gl_Position;"
" geomTexCoord = vec3(c0, c1, aom);"
" EmitVertex();"
" gl_Position = vec4(cpos+noffs[1]*c05, 1.0);"
" geomLightDir = LightPosition - gl_Position.xyz;"
" gl_Position = Matrix * gl_Position;"
" geomTexCoord = vec3(c1, c1, aom);"
" EmitVertex();"
" gl_Position = vec4(cpos+noffs[5]*c05, 1.0);"
" geomLightDir = LightPosition - gl_Position.xyz;"
" gl_Position = Matrix * gl_Position;"
" geomTexCoord = vec3(c0, c0, aom);"
" EmitVertex();"
" gl_Position = vec4(cpos+noffs[3]*c05, 1.0);"
" geomLightDir = LightPosition - gl_Position.xyz;"
" gl_Position = Matrix * gl_Position;"
" geomTexCoord = vec3(c1, c0, aom);"
" EmitVertex();"
" EndPrimitive();"
" }"
" }"
"}"
).Compile();
prog.AttachShader(gs);
FragmentShader fs;
fs.Source(
"#version 330\n"
"uniform sampler2DArray AmbiOcclMaps;"
"in vec3 geomNormal;"
"in vec3 geomLightDir;"
"in vec3 geomTexCoord;"
"in float geomShadow;"
"out vec3 fragColor;"
"void main(void)"
"{"
" float amoc = texture(AmbiOcclMaps, geomTexCoord).r;"
" float shdw = sqrt(0.5*(1.0+geomShadow));"
" float ambi = 0.5;"
" float diff = max(dot(geomNormal, normalize(geomLightDir)), 0)*0.6;"
" float light = ambi*amoc*shdw + (0.8*amoc*shdw+0.2)*diff;"
" fragColor = vec3(1,1,1)*light;"
"}"
).Compile();
prog.AttachShader(fs);
prog.Link().Use();
return std::move(prog);
}
SinglePassEdgeExample(void)
: make_shape(1, shapes::SubdivSphereInitialShape::Octohedron)
, shape_instr(make_shape.Instructions())
, shape_indices(make_shape.Indices())
, vs(ObjectDesc("Vertex"))
, gs(ObjectDesc("Geometry"))
, fs(ObjectDesc("Fragment"))
, projection_matrix(prog, "ProjectionMatrix")
, camera_matrix(prog, "CameraMatrix")
, model_matrix(prog, "ModelMatrix")
, viewport_dimensions(prog, "ViewportDimensions")
, edge_width(prog, "EdgeWidth")
{
vs.Source(StrLit(
"#version 330\n"
"const vec3 LightPosition = vec3(10.0, 10.0, 7.0);"
"uniform mat4 ProjectionMatrix, CameraMatrix, ModelMatrix;"
"in vec4 Position;"
"out vec3 vertNormal;"
"out vec3 vertLightDir;"
"void main(void)"
"{"
" gl_Position = "
" ModelMatrix *"
" Position;"
" vertNormal = ("
" ModelMatrix *"
" vec4(Position.xyz, 0.0)"
" ).xyz;"
" vertLightDir = "
" LightPosition -"
" gl_Position.xyz;"
" gl_Position = "
" ProjectionMatrix *"
" CameraMatrix *"
" gl_Position;"
"}"
));
vs.Compile();
gs.Source(StrLit(
"#version 330\n"
"layout (triangles) in;"
"layout (triangle_strip, max_vertices = 3) out;"
"uniform vec2 ViewportDimensions;"
"in vec3 vertNormal[], vertLightDir[];"
"noperspective out vec3 geomDist;"
"flat out vec3 geomNormal;"
"flat out vec3 geomColor;"
"out vec3 geomLightDir;"
"void main(void)"
"{"
" geomNormal = normalize("
" vertNormal[0]+"
" vertNormal[1]+"
" vertNormal[2]"
" );"
" geomColor = normalize(abs("
" vec3(1.0, 1.0, 1.0)-"
" geomNormal"
" ));"
" vec2 ScreenPos[3];"
" for(int i=0; i!=3; ++i)"
" {"
" ScreenPos[i] = "
" ViewportDimensions*"
" gl_in[i].gl_Position.xy/"
" gl_in[i].gl_Position.w;"
" }"
" vec2 TmpVect[3];"
" for(int i=0; i!=3; ++i)"
" {"
" TmpVect[i] = "
" ScreenPos[(i+2)%3]-"
" ScreenPos[(i+1)%3];"
" }"
" const vec3 EdgeMask[3] = vec3[3]("
" vec3(1.0, 0.0, 0.0),"
" vec3(0.0, 1.0, 0.0),"
" vec3(0.0, 0.0, 1.0) "
" );"
" for(int i=0; i!=3; ++i)"
" {"
" float Dist = abs("
" TmpVect[(i+1)%3].x*TmpVect[(i+2)%3].y-"
" TmpVect[(i+1)%3].y*TmpVect[(i+2)%3].x "
" ) / length(TmpVect[i]);"
" vec3 DistVect = vec3(Dist, Dist, Dist);"
" gl_Position = gl_in[i].gl_Position;"
" geomLightDir = vertLightDir[i];"
" geomDist = EdgeMask[i] * DistVect;"
" EmitVertex();"
" }"
" EndPrimitive();"
"}"
));
gs.Compile();
fs.Source(StrLit(
"#version 330\n"
"uniform float EdgeWidth;"
"noperspective in vec3 geomDist;"
"flat in vec3 geomNormal;"
"flat in vec3 geomColor;"
"in vec3 geomLightDir;"
"out vec3 fragColor;"
"void main(void)"
"{"
" float MinDist = min(min(geomDist.x,geomDist.y),geomDist.z);"
" float EdgeAlpha = exp2(-pow(MinDist/EdgeWidth, 2.0));"
" const float Ambient = 0.8;"
" float Diffuse = max(dot("
" normalize(geomNormal),"
" normalize(geomLightDir)"
" ), 0.0);"
" vec3 FaceColor = geomColor * (Diffuse + Ambient);"
" const vec3 EdgeColor = vec3(0.0, 0.0, 0.0);"
" fragColor = mix(FaceColor, EdgeColor, EdgeAlpha);"
"}"
));
fs.Compile();
prog.AttachShader(vs);
prog.AttachShader(gs);
prog.AttachShader(fs);
prog.Link();
prog.Use();
shape.Bind();
verts.Bind(Buffer::Target::Array);
{
std::vector<GLfloat> data;
GLuint n_per_vertex = make_shape.Positions(data);
Buffer::Data(Buffer::Target::Array, data);
VertexAttribArray attr(prog, "Position");
attr.Setup<GLfloat>(n_per_vertex);
attr.Enable();
indices.Bind(Buffer::Target::ElementArray);
Buffer::Data(Buffer::Target::ElementArray, shape_indices);
shape_indices.clear();
}
//
gl.ClearColor(0.8f, 0.8f, 0.8f, 0.0f);
gl.ClearDepth(1.0f);
gl.Enable(Capability::DepthTest);
gl.Enable(Capability::CullFace);
gl.CullFace(Face::Back);
gl.FrontFace(make_shape.FaceWinding());
prog.Use();
}
WritingExample(void)
{
VertexShader vs;
// Set the vertex shader source
vs.Source(
"#version 330\n"
"in vec4 Position;"
"void main(void)"
"{"
" gl_Position = Position;"
"}"
);
// compile it
vs.Compile();
GeometryShader gs;
// Set the geometry shader source
gs.Source(
"#version 330\n"
"layout(lines) in;"
"layout(triangle_strip, max_vertices = 4) out;"
"void main(void)"
"{"
" vec4 offs = vec4(0.02, 0.01, 0.0, 0.0);"
" gl_Position = gl_in[0].gl_Position - offs;"
" EmitVertex();"
" gl_Position = gl_in[0].gl_Position + offs;"
" EmitVertex();"
" gl_Position = gl_in[1].gl_Position - offs;"
" EmitVertex();"
" gl_Position = gl_in[1].gl_Position + offs;"
" EmitVertex();"
" EndPrimitive();"
"}"
);
// compile it
gs.Compile();
FragmentShader fs;
// set the fragment shader source
fs.Source(
"#version 330\n"
"out vec4 fragColor;"
"void main(void)"
"{"
" fragColor = vec4(0.0, 0.0, 0.0, 1.0);"
"}"
);
// compile it
fs.Compile();
// attach the shaders to the program
prog.AttachShader(vs);
prog.AttachShader(gs);
prog.AttachShader(fs);
// link and use it
prog.Link();
prog.Use();
const Vec2f points[] = {
Vec2f(-0.33f, +0.50f),
Vec2f(-0.45f, +0.70f),
Vec2f(-0.66f, +0.70f),
Vec2f(-0.66f, +0.30f),
Vec2f(-0.66f, -0.20f),
Vec2f(-0.35f, -0.15f),
Vec2f(-0.30f, +0.05f),
Vec2f(-0.20f, +0.50f),
Vec2f(-0.30f, +0.50f),
Vec2f(-0.33f, +0.50f),
Vec2f(-0.50f, +0.45f),
Vec2f(-0.10f, +0.40f),
Vec2f(+0.10f, +0.55f),
Vec2f(-0.20f, +0.40f),
Vec2f(-0.30f, -0.10f),
Vec2f( 0.00f, -0.10f),
Vec2f(+0.10f, -0.10f),
Vec2f(+0.20f, -0.10f),
Vec2f(+0.10f, +0.55f),
Vec2f(+0.20f, +0.00f),
Vec2f(+0.30f, -0.70f),
Vec2f( 0.00f, -0.75f),
Vec2f(-0.40f, -0.75f),
Vec2f( 0.00f, 0.00f),
Vec2f(+0.40f, +0.10f),
Vec2f(+0.60f, +0.10f),
Vec2f(+0.70f, +0.90f),
Vec2f(+0.55f, +0.90f),
Vec2f(+0.35f, +0.90f),
Vec2f(+0.10f, -0.10f),
Vec2f(+0.55f, 0.00f),
Vec2f(+0.90f, 0.10f),
Vec2f(+0.70f, 0.10f),
Vec2f(+0.90f, 0.20f)
};
BezierCurves<Vec2f, double, 3> bezier(
std::vector<Vec2f>(
points,
points+sizeof(points)/sizeof(points[0])
)
);
writing.Bind();
{
auto data = bezier.Approximate(25);
curve_n = data.size();
Bind(curve_verts, Buffer::Target::Array).Data(data);
VertexAttribArray attr(prog, "Position");
attr.Setup(2, DataType::Float);
attr.Enable();
}
gl.ClearColor(0.9f, 0.9f, 0.9f, 0.0f);
}
CubeExample(void)
: cube_instr(make_cube.Instructions())
, cube_indices(make_cube.Indices())
, projection_matrix(prog, "ProjectionMatrix")
, camera_matrix(prog, "CameraMatrix")
{
// Set the vertex shader source and compile it
vs.Source(
"#version 330\n"
"in vec4 Position;"
"void main(void)"
"{"
" gl_Position = Position;"
"}"
).Compile();
// Set the geometry shader source and compile it
gs.Source(
"#version 330\n"
"layout(triangles) in;"
"layout(triangle_strip, max_vertices = 108) out;"
"uniform mat4 ProjectionMatrix, CameraMatrix;"
"out vec3 vertColor;"
"void main(void)"
"{"
" for(int c=0; c!=36; ++c)"
" {"
" float angle = c * 10 * 2 * 3.14159 / 360.0;"
" float cx = cos(angle);"
" float sx = sin(angle);"
" mat4 ModelMatrix = mat4("
" cx, 0.0, sx, 0.0,"
" 0.0, 1.0, 0.0, 0.0,"
" -sx, 0.0, cx, 0.0,"
" 0.0, 0.0, 0.0, 1.0 "
" ) * mat4("
" 1.0, 0.0, 0.0, 0.0,"
" 0.0, 1.0, 0.0, 0.0,"
" 0.0, 0.0, 1.0, 0.0,"
" 12.0, 0.0, 0.0, 1.0 "
" );"
" for(int v=0; v!=gl_in.length(); ++v)"
" {"
" vec4 vert = gl_in[v].gl_Position;"
" gl_Position = "
" ProjectionMatrix *"
" CameraMatrix *"
" ModelMatrix *"
" vert;"
" vertColor = abs(normalize(ModelMatrix*vert)).xzy;"
" EmitVertex();"
" }"
" EndPrimitive();"
" }"
"}"
).Compile();
// set the fragment shader source and compile it
fs.Source(
"#version 330\n"
"in vec3 vertColor;"
"out vec4 fragColor;"
"void main(void)"
"{"
" fragColor = vec4(vertColor, 1.0);"
"}"
).Compile();
// attach the shaders to the program
prog << vs << gs << fs;
// link and use it
prog.Link().Use();
// bind the VAO for the cube
cube.Bind();
// bind the VBO for the cube vertices
verts.Bind(Buffer::Target::Array);
{
std::vector<GLfloat> data;
GLuint n_per_vertex = make_cube.Positions(data);
// upload the data
Buffer::Data(Buffer::Target::Array, data);
// setup the vertex attribs array for the vertices
VertexAttribArray attr(prog, "Position");
attr.Setup(n_per_vertex, DataType::Float).Enable();
}
gl.ClearColor(0.9f, 0.9f, 0.9f, 0.0f);
gl.ClearDepth(1.0f);
gl.Enable(Capability::DepthTest);
}
SmokeExample(void)
: emitters()
, projection_matrix(prog, "ProjectionMatrix")
, camera_matrix(prog, "CameraMatrix")
{
emitters.push_back(
ParticleSystem(
ListOf<Vec3f>
(Vec3f(-20.0f, -10.0f, 10.0f))
(Vec3f( 20.0f, 0.0f, -20.0f))
(Vec3f( 20.0f, 10.0f, 20.0f))
(Vec3f(-20.0f, 0.0f, -10.0f))
.As<std::vector<Vec3f>>(), 5.0, 200.0
)
);
emitters.push_back(
ParticleSystem(
ListOf<Vec3f>
(Vec3f( 30.0f, 0.0f, 0.0f))
(Vec3f(-30.0f, 0.0f, 0.0f))
(Vec3f(-20.0f, 20.0f, 0.0f))
(Vec3f( 20.0f, -10.0f, 0.0f))
.As<std::vector<Vec3f>>(), 3.0, 200.0
)
);
emitters.push_back(
ParticleSystem(
ListOf<Vec3f>
(Vec3f( 5.0f, 20.0f, 20.0f))
(Vec3f( -5.0f, 20.0f, -20.0f))
(Vec3f( 5.0f, -20.0f, -20.0f))
(Vec3f( -5.0f, -20.0f, 20.0f))
.As<std::vector<Vec3f>>(), 20.0, 100.0
)
);
// Set the vertex shader source
vs.Source(
"#version 330\n"
"uniform mat4 CameraMatrix;"
"in vec4 Position;"
"in float Age;"
"out float vertAge;"
"void main(void)"
"{"
" gl_Position = CameraMatrix * Position;"
" vertAge = Age;"
"}"
);
// compile it
vs.Compile();
// Set the geometry shader source
gs.Source(
"#version 330\n"
"layout(points) in;"
"layout(triangle_strip, max_vertices = 4) out;"
"uniform mat4 ProjectionMatrix;"
"in float vertAge[];"
"out float geomAge;"
"void main(void)"
"{"
" if(vertAge[0] > 1.0) return;"
" float s = 0.5;"
" float yo[2] = float[2](-1.0, 1.0);"
" float xo[2] = float[2](-1.0, 1.0);"
" for(int j=0;j!=2;++j)"
" for(int i=0;i!=2;++i)"
" {"
" float xoffs = xo[i]*(1.0+vertAge[0])*s;"
" float yoffs = yo[j]*(1.0+vertAge[0])*s;"
" gl_Position = ProjectionMatrix * vec4("
" gl_in[0].gl_Position.x-xoffs,"
" gl_in[0].gl_Position.y-yoffs,"
" gl_in[0].gl_Position.z,"
" 1.0"
" );"
" geomAge = vertAge[0];"
" EmitVertex();"
" }"
" EndPrimitive();"
"}"
);
// compile it
gs.Compile();
// set the fragment shader source
fs.Source(
"#version 330\n"
"in float geomAge;"
"out vec4 fragColor;"
"void main(void)"
"{"
" vec3 Color1 = vec3(1.0, 0.5, 0.5);"
" vec3 Color2 = vec3(0.3, 0.1, 0.1);"
" fragColor = vec4("
" mix(Color1, Color2, geomAge),"
" 1.0 - geomAge"
" );"
"}"
);
// compile it
fs.Compile();
// attach the shaders to the program
prog.AttachShader(vs);
prog.AttachShader(gs);
prog.AttachShader(fs);
// link and use it
prog.Link();
prog.Use();
// bind the VAO for the particles
particles.Bind();
// bind the VBO for the particle positions
pos_buf.Bind(Buffer::Target::Array);
{
Buffer::Data(Buffer::Target::Array, positions, BufferUsage::DynamicDraw);
VertexAttribArray attr(prog, "Position");
attr.Setup(3, DataType::Float);
attr.Enable();
}
// bind the VBO for the particle ages
age_buf.Bind(Buffer::Target::Array);
{
Buffer::Data(Buffer::Target::Array, ages, BufferUsage::DynamicDraw);
VertexAttribArray attr(prog, "Age");
attr.Setup(1, DataType::Float);
attr.Enable();
}
//
gl.ClearColor(0.9f, 0.9f, 0.9f, 0.0f);
gl.ClearDepth(1.0f);
gl.Enable(Capability::DepthTest);
gl.Enable(Capability::Blend);
gl.BlendFunc(BlendFn::SrcAlpha, BlendFn::OneMinusSrcAlpha);
}
MultiViewportExample(void)
: make_shape(1.0, 0.1, 8, 4, 48)
, shape_instr(make_shape.Instructions())
, shape_indices(make_shape.Indices())
, camera_position_3(prog, "CameraPosition[3]")
, camera_matrix_0(prog, "CameraMatrix[0]")
, camera_matrix_1(prog, "CameraMatrix[1]")
, camera_matrix_2(prog, "CameraMatrix[2]")
, camera_matrix_3(prog, "CameraMatrix[3]")
, model_matrix(prog, "ModelMatrix")
{
VertexShader vs;
// Set the vertex shader source
vs.Source(
"#version 330\n"
"uniform mat4 ModelMatrix;"
"uniform vec3 LightPos;"
"in vec4 Position;"
"in vec3 Normal;"
"out vec3 vertNormal;"
"out vec3 vertTexCoord;"
"out vec3 vertLightDir;"
"out vec3 vertLightRefl;"
"void main(void)"
"{"
" vertNormal = mat3(ModelMatrix)*Normal;"
" vertTexCoord = Normal;"
" gl_Position = ModelMatrix * Position;"
" vertLightDir = LightPos-gl_Position.xyz;"
" vertLightRefl = reflect(-vertLightDir, vertNormal);"
"}"
);
vs.Compile();
GeometryShader gs;
// Set the geometry shader source
gs.Source(
"#version 330\n"
"#extension GL_ARB_viewport_array : enable\n"
"layout(triangles) in;"
"layout(triangle_strip, max_vertices = 12) out;"
"uniform mat4 CameraMatrix[4];"
"uniform vec3 CameraPosition[4];"
"in vec3 vertNormal[];"
"in vec3 vertTexCoord[];"
"in vec3 vertLightDir[];"
"in vec3 vertLightRefl[];"
"out vec3 geomNormal;"
"out vec3 geomTexCoord;"
"out vec3 geomLightDir;"
"out vec3 geomLightRefl;"
"out vec3 geomViewDir;"
"out vec3 geomViewRefl;"
"void main(void)"
"{"
" for(int vp=0; vp!=4; ++vp)"
" {"
" gl_ViewportIndex = vp;"
" for(int v=0; v!=3; ++v)"
" {"
" geomNormal = vertNormal[v];"
" geomTexCoord = vertTexCoord[v];"
" geomLightDir = vertLightDir[v];"
" geomLightRefl = vertLightRefl[v];"
" geomViewDir = "
" CameraPosition[vp] - "
" gl_in[v].gl_Position.xyz;"
" geomViewRefl = reflect("
" -geomViewDir,"
" geomNormal"
" );"
" gl_Position = "
" CameraMatrix[vp] *"
" gl_in[v].gl_Position;"
" EmitVertex();"
" }"
" EndPrimitive();"
" }"
"}"
);
gs.Compile();
FragmentShader fs;
// set the fragment shader source
fs.Source(
"#version 330\n"
"uniform samplerCube TexUnit;"
"in vec3 geomNormal;"
"in vec3 geomTexCoord;"
"in vec3 geomLightDir;"
"in vec3 geomLightRefl;"
"in vec3 geomViewDir;"
"in vec3 geomViewRefl;"
"out vec4 fragColor;"
"void main(void)"
"{"
" float l = length(geomLightDir);"
" float d = dot("
" normalize(geomNormal), "
" normalize(geomLightDir)"
" ) / l;"
" float s = dot("
" normalize(geomLightRefl),"
" normalize(geomViewDir)"
" );"
" vec3 lt = vec3(1.0, 1.0, 1.0);"
" vec3 tex = texture(TexUnit, geomTexCoord).rgb;"
" fragColor = vec4("
" tex * 0.4 + "
" (lt + tex) * 1.5 * max(d, 0.0) + "
" lt * pow(max(s, 0.0), 64), "
" 1.0"
" );"
"}"
);
// compile it
fs.Compile();
// attach the shaders to the program
prog.AttachShader(vs);
prog.AttachShader(gs);
prog.AttachShader(fs);
// link and use it
prog.Link();
prog.Use();
// bind the VAO for the shape
shape.Bind();
verts.Bind(Buffer::Target::Array);
{
std::vector<GLfloat> data;
GLuint n_per_vertex = make_shape.Positions(data);
Buffer::Data(Buffer::Target::Array, data);
VertexAttribArray attr(prog, "Position");
attr.Setup<GLfloat>(n_per_vertex);
attr.Enable();
}
normals.Bind(Buffer::Target::Array);
{
std::vector<GLfloat> data;
GLuint n_per_vertex = make_shape.Normals(data);
Buffer::Data(Buffer::Target::Array, data);
VertexAttribArray attr(prog, "Normal");
attr.Setup<GLfloat>(n_per_vertex);
attr.Enable();
}
// setup the texture
{
GLuint tex_side = 512;
auto image = images::NewtonFractal(
tex_side, tex_side,
Vec3f(0.8f, 0.8f, 1.0f),
Vec3f(0.1f, 0.0f, 0.2f),
Vec2f(-0.707f, -0.707f),
Vec2f( 0.707f, 0.707f),
images::NewtonFractal::X4Minus1(),
[](double x) -> double
{
return pow(SineWave(pow(x,0.5)), 4.0);
}
);
auto bound_tex = Bind(tex, Texture::Target::CubeMap);
bound_tex.MinFilter(TextureMinFilter::Linear);
bound_tex.MagFilter(TextureMagFilter::Linear);
bound_tex.WrapS(TextureWrap::ClampToEdge);
bound_tex.WrapT(TextureWrap::ClampToEdge);
bound_tex.WrapR(TextureWrap::ClampToEdge);
for(int i=0; i!=6; ++i)
Texture::Image2D(Texture::CubeMapFace(i), image);
}
//
UniformSampler(prog, "TexUnit").Set(0);
Uniform<Vec3f>(prog, "LightPos").Set(Vec3f(3.0f, 5.0f, 4.0f));
//
gl.ClearColor(0.1f, 0.05f, 0.2f, 0.0f);
gl.ClearDepth(1.0f);
gl.Enable(Capability::DepthTest);
gl.Enable(Capability::CullFace);
gl.FrontFace(make_shape.FaceWinding());
gl.CullFace(Face::Back);
Uniform<Vec3f> camera_position(prog, "CameraPosition");
camera_position[0].Set(Vec3f(2, 0, 0));
camera_position[1].Set(Vec3f(0, 2, 0));
camera_position[2].Set(Vec3f(0, 0, 2));
}
CloudExample(void)
: projection_matrix(prog, "ProjectionMatrix")
, camera_matrix(prog, "CameraMatrix")
{
// Set the vertex shader source
vs.Source(
"#version 330\n"
"in vec4 Position;"
"uniform mat4 CameraMatrix;"
"void main(void)"
"{"
" gl_Position = "
" CameraMatrix *"
" Position;"
"}"
);
// compile it
vs.Compile();
// Set the geometry shader source
gs.Source(
"#version 330\n"
"layout(points) in;"
"layout(triangle_strip, max_vertices = 100) out;"
"const int p = 25;"
"const float hp = (p-1)*0.5;"
"uniform vec3 LightPos;"
"uniform mat4 CameraMatrix, ProjectionMatrix;"
"out vec3 geomTexCoord;"
"out vec3 geomLightDir;"
"void main(void)"
"{"
" float s = 0.6;"
" float yo[2] = float[2](-1.0, 1.0);"
" float xo[2] = float[2](-1.0, 1.0);"
" vec3 cx = vec3("
" CameraMatrix[0][0],"
" CameraMatrix[1][0],"
" CameraMatrix[2][0] "
" );"
" vec3 cy = vec3("
" CameraMatrix[0][1],"
" CameraMatrix[1][1],"
" CameraMatrix[2][1] "
" );"
" vec3 cz = vec3("
" CameraMatrix[0][2],"
" CameraMatrix[1][2],"
" CameraMatrix[2][2] "
" );"
" for(int k=0;k!=p;++k)"
" {"
" for(int j=0;j!=2;++j)"
" for(int i=0;i!=2;++i)"
" {"
" float zo = ((k - hp) / hp);"
" float xoffs = xo[i]*s;"
" float yoffs = yo[j]*s;"
" float zoffs = zo *s;"
" vec4 v = vec4("
" gl_in[0].gl_Position.x+xoffs,"
" gl_in[0].gl_Position.y+yoffs,"
" gl_in[0].gl_Position.z+zoffs,"
" 1.0"
" );"
" gl_Position = ProjectionMatrix * v;"
" geomLightDir = LightPos - v.xyz;"
" geomTexCoord = "
" vec3(0.5, 0.5, 0.5)+"
" cx*(xo[i])*0.707+"
" cy*(yo[j])*0.707+"
" cz*(zo )*0.707;"
" EmitVertex();"
" }"
" EndPrimitive();"
" }"
"}"
);
// compile it
gs.Compile();
// set the fragment shader source
fs.Source(
"#version 330\n"
"uniform sampler3D cloudTex;"
"in vec3 geomTexCoord;"
"in vec3 geomLightDir;"
"out vec4 fragColor;"
"void main(void)"
"{"
" float d = texture(cloudTex, geomTexCoord).r;"
" float o = 1.0;"
" float s = 2.0/128.0;"
" float r = s * 8.0;"
" vec3 sampleOffs = normalize(geomLightDir) * s;"
" vec3 samplePos = geomTexCoord;"
" if(d > 0.01) while(o > 0.0)"
" {"
" if(samplePos.x<0.0 || samplePos.x>1.0)"
" break;"
" if(samplePos.y<0.0 || samplePos.y>1.0)"
" break;"
" if(samplePos.z<0.0 || samplePos.z>1.0)"
" break;"
" o -= texture(cloudTex, samplePos).r*r;"
" samplePos += sampleOffs;"
" }"
" float a = 0.2 * d;"
" float i = mix(0.4, 1.0, o);"
" fragColor = vec4(i, i, i, a);"
"}"
);
// compile it
fs.Compile();
// attach the shaders to the program
prog.AttachShader(vs);
prog.AttachShader(gs);
prog.AttachShader(fs);
// link and use it
prog.Link();
prog.Use();
// bind the VAO for the clouds
clouds.Bind();
// bind the VBO for the cloud positions
buffer.Bind(Buffer::Target::Array);
{
GLfloat positions[3] = {0.5f, 0.1f, 0.2f};
Buffer::Data(Buffer::Target::Array, 3, positions);
VertexAttribArray attr(prog, "Position");
attr.Setup(3, DataType::Float);
attr.Enable();
}
{
Texture::Active(0);
UniformSampler(prog, "cloudTex").Set(0);
auto bound_tex = Bind(cloud_tex, Texture::Target::_3D);
bound_tex.Image3D(images::Cloud(128, 128, 128));
bound_tex.GenerateMipmap();
bound_tex.MinFilter(TextureMinFilter::LinearMipmapLinear);
bound_tex.MagFilter(TextureMagFilter::Linear);
bound_tex.BorderColor(Vec4f(0.0f, 0.0f, 0.0f, 0.0f));
bound_tex.WrapS(TextureWrap::ClampToBorder);
bound_tex.WrapT(TextureWrap::ClampToBorder);
bound_tex.WrapR(TextureWrap::ClampToBorder);
}
Uniform<Vec3f>(prog, "LightPos").Set(Vec3f(10.0f, 1.0f, 5.0f));
gl.ClearColor(0.2f, 0.3f, 0.4f, 0.0f);
gl.ClearDepth(1.0f);
gl.Enable(Capability::DepthTest);
gl.Enable(Capability::Blend);
gl.BlendFunc(BlendFn::SrcAlpha, BlendFn::OneMinusSrcAlpha);
}
CloudExample(const ExampleParams& params)
: sphere_instr(make_sphere.Instructions())
, sphere_indices(make_sphere.Indices())
, samples(25 + params.quality*params.quality*100)
, positions(make_positions())
, sizes(make_sizes())
, cloud_tex(positions.size())
, light_path(make_light_path_cps())
{
assert(positions.size() == sizes.size());
std::srand(123456);
light_vs.Source(
"#version 330\n"
"in vec3 Position;"
"uniform vec3 LightPos;"
"uniform mat4 CameraMatrix, ProjectionMatrix;"
"void main(void)"
"{"
" float s = 0.1;"
" gl_Position = "
" ProjectionMatrix*"
" CameraMatrix*"
" vec4(Position*s + LightPos, 1.0);"
"}"
).Compile();
light_fs.Source(
"#version 330\n"
"out vec4 fragLight;"
"void main(void)"
"{"
" fragLight = vec4(1.0, 1.0, 1.0, 1.0);"
"}"
).Compile();
light_prog << light_vs << light_fs;
light_prog.Link().Use();
light.Bind();
buffer.Bind(Buffer::Target::Array);
{
std::vector<GLfloat> data;
GLuint n_per_vertex = make_sphere.Positions(data);
Buffer::Data(Buffer::Target::Array, data);
(light_prog|"Position").Setup(n_per_vertex, DataType::Float).Enable();
}
cloud_vs.Source(
"#version 330\n"
"in vec4 Position;"
"in float Size;"
"uniform int SampleCount;"
"uniform mat4 CameraMatrix;"
"uniform vec4 ViewZ;"
"out float vertZOffs;"
"out float vertSize;"
"void main(void)"
"{"
" float hp = (SampleCount-1) * 0.5;"
" vertZOffs = (gl_InstanceID - hp)/hp;"
" vertSize = Size;"
" gl_Position = vec4("
" Position.xyz +"
" ViewZ.xyz*vertZOffs*Size*0.5,"
" 1.0"
" );"
"}"
).Compile();
cloud_gs.Source(
"#version 330\n"
"layout(points) in;"
"layout(triangle_strip, max_vertices = 4) out;"
"in float vertZOffs[];"
"in float vertSize[];"
"uniform vec3 LightPos;"
"uniform mat4 CameraMatrix, ProjectionMatrix;"
"uniform vec4 ViewX, ViewY, ViewZ;"
"out vec3 geomTexCoord;"
"out vec3 geomLightDir;"
"void main(void)"
"{"
" float zo = vertZOffs[0];"
" float s = vertSize[0];"
" float yo[2] = float[2](-1.0, 1.0);"
" float xo[2] = float[2](-1.0, 1.0);"
" for(int j=0;j!=2;++j)"
" for(int i=0;i!=2;++i)"
" {"
" vec4 v = vec4("
" gl_in[0].gl_Position.xyz+"
" ViewX.xyz * xo[i] * s * 0.5+"
" ViewY.xyz * yo[j] * s * 0.5,"
" 1.0"
" );"
" gl_Position = ProjectionMatrix * CameraMatrix * v;"
" geomLightDir = LightPos - v.xyz;"
" geomTexCoord = "
" vec3(0.5, 0.5, 0.5)+"
" ViewX.xyz*(xo[i])*0.707+"
" ViewY.xyz*(yo[j])*0.707+"
" ViewZ.xyz*(zo )*0.707;"
" EmitVertex();"
" }"
" EndPrimitive();"
"}"
).Compile();
cloud_fs.Source(
"#version 330\n"
"uniform sampler3D CloudTex;"
"in vec3 geomTexCoord;"
"in vec3 geomLightDir;"
"out vec4 fragColor;"
"void main(void)"
"{"
" float d = texture(CloudTex, geomTexCoord).r;"
" float o = 1.0;"
" float s = 2.0/128.0;"
" float r = s * 8.0;"
" vec3 sampleOffs = normalize(geomLightDir) * s;"
" vec3 samplePos = geomTexCoord;"
" if(d > 0.01) while(o > 0.0)"
" {"
" if(samplePos.x<0.0 || samplePos.x>1.0)"
" break;"
" if(samplePos.y<0.0 || samplePos.y>1.0)"
" break;"
" if(samplePos.z<0.0 || samplePos.z>1.0)"
" break;"
" o -= texture(CloudTex, samplePos).r*r;"
" samplePos += sampleOffs;"
" }"
" float a = 0.4 * d;"
" float i = mix(0.2, 1.0, o);"
" fragColor = vec4(i, i, i, a);"
"}"
).Compile();
cloud_prog << cloud_vs << cloud_gs << cloud_fs;
cloud_prog.Link().Use();
// bind the VAO for the clouds
clouds.Bind();
// bind the VBO for the cloud positions
pos_buffer.Bind(Buffer::Target::Array);
{
Buffer::Data(Buffer::Target::Array, positions);
(cloud_prog|"Position").Setup(3, DataType::Float).Enable();
}
// bind the VBO for the cloud sizes
size_buffer.Bind(Buffer::Target::Array);
{
Buffer::Data(Buffer::Target::Array, sizes);
(cloud_prog|"Size").Setup(1, DataType::Float).Enable();
}
// set the number of samples
cloud_prog/"SampleCount" = GLint(samples);
Texture::Active(0);
cloud_prog/"CloudTex" = 0;
for(std::size_t i=0, n=positions.size(); i!=n; ++i)
{
auto bound_tex = Bind(cloud_tex[i], Texture::Target::_3D);
bound_tex.Image3D(
images::Cloud(
128, 128, 128,
Vec3f(0.1f, -0.5f, 0.3f),
0.5f
)
);
bound_tex.GenerateMipmap();
bound_tex.MinFilter(TextureMinFilter::LinearMipmapLinear);
bound_tex.MagFilter(TextureMagFilter::Linear);
bound_tex.BorderColor(Vec4f(0.0f, 0.0f, 0.0f, 0.0f));
bound_tex.WrapS(TextureWrap::ClampToBorder);
bound_tex.WrapT(TextureWrap::ClampToBorder);
bound_tex.WrapR(TextureWrap::ClampToBorder);
}
gl.ClearColor(0.0f, 0.1f, 0.2f, 0.0f);
gl.ClearDepth(1.0f);
gl.Disable(Capability::DepthTest);
gl.Enable(Capability::Blend);
gl.BlendFunc(BlendFn::SrcAlpha, BlendFn::OneMinusSrcAlpha);
}
CubeMapExample(void)
: make_shape(4)
, shape_instr(make_shape.Instructions())
, shape_indices(make_shape.Indices())
, projection_matrix(prog, "ProjectionMatrix")
, camera_matrix(prog, "CameraMatrix")
, model_matrix(prog, "ModelMatrix")
{
vs.Source(
"#version 330\n"
"uniform mat4 ProjectionMatrix, CameraMatrix, ModelMatrix;"
"in vec4 Position;"
"out vec3 vertNormal;"
"out vec3 vertTexCoord;"
"out vec3 vertLightDir;"
"out vec3 vertViewDir;"
"uniform vec3 LightPos;"
"void main(void)"
"{"
" vec3 Normal = Position.xyz;"
" gl_Position = ModelMatrix * Position;"
" vertNormal = mat3(ModelMatrix)*Normal;"
" vertTexCoord = Normal;"
" vertLightDir = LightPos - gl_Position.xyz;"
" vertViewDir = (vec4(0.0, 0.0, 1.0, 1.0)*CameraMatrix).xyz;"
" gl_Position = ProjectionMatrix * CameraMatrix * gl_Position;"
"}"
);
vs.Compile();
gs.Source(
"#version 330\n"
"layout (triangles) in;"
"layout (triangle_strip, max_vertices = 3) out;"
"in vec3 vertNormal[3];"
"in vec3 vertTexCoord[3];"
"in vec3 vertLightDir[3];"
"in vec3 vertViewDir[3];"
"out vec3 geomNormal;"
"out vec3 geomTexCoord;"
"out vec3 geomLightDir;"
"out vec3 geomLightRefl;"
"out vec3 geomViewDir;"
"void main(void)"
"{"
" vec3 FaceNormal = 0.333333*("
" vertNormal[0]+"
" vertNormal[1]+"
" vertNormal[2] "
" );"
" for(int v=0; v!=3; ++v)"
" {"
" gl_Position = gl_in[v].gl_Position;"
" geomNormal = 0.5*(vertNormal[v]+FaceNormal);"
" geomTexCoord = vertTexCoord[v];"
" geomLightDir = vertLightDir[v];"
" geomLightRefl = reflect("
" -normalize(geomLightDir),"
" normalize(FaceNormal)"
" );"
" geomViewDir = vertViewDir[v];"
" EmitVertex();"
" }"
" EndPrimitive();"
"}"
);
gs.Compile();
fs.Source(
"#version 330\n"
"uniform samplerCube TexUnit;"
"in vec3 geomNormal;"
"in vec3 geomTexCoord;"
"in vec3 geomLightDir;"
"in vec3 geomLightRefl;"
"in vec3 geomViewDir;"
"out vec3 fragColor;"
"void main(void)"
"{"
" vec3 lt = vec3(1.0, 1.0, 1.0);"
" vec3 tex = texture(TexUnit, geomTexCoord).rgb;"
" float d = dot("
" normalize(geomNormal), "
" normalize(geomLightDir)"
" );"
" float s = dot("
" normalize(geomLightRefl),"
" normalize(geomViewDir)"
" );"
" float b = 1.0-sqrt(max(dot("
" normalize(geomNormal),"
" normalize(geomViewDir)"
" ), 0.0));"
" float ea = clamp(tex.b*(-d+0.2), 0.0, 1.0);"
" float sr = 1.0-tex.b*0.8;"
" fragColor = "
" tex * (0.3*ea + 0.6*b + 0.8*max(d, 0.0)) + "
" (tex+lt) * 0.8*sr*pow(clamp(s+0.05, 0.0, 1.0), 32);"
"}"
);
fs.Compile();
// attach the shaders to the program
prog.AttachShader(vs);
prog.AttachShader(gs);
prog.AttachShader(fs);
// link and use it
prog.Link();
prog.Use();
// bind the VAO for the shape
shape.Bind();
positions.Bind(Buffer::Target::Array);
{
std::vector<GLfloat> data;
GLuint n_per_vertex = make_shape.Positions(data);
Buffer::Data(Buffer::Target::Array, data);
VertexAttribArray attr(prog, "Position");
attr.Setup<GLfloat>(n_per_vertex);
attr.Enable();
}
// setup the texture
{
auto bound_tex = Bind(tex, Texture::Target::CubeMap);
bound_tex.MinFilter(TextureMinFilter::Linear);
bound_tex.MagFilter(TextureMagFilter::Linear);
bound_tex.WrapS(TextureWrap::ClampToEdge);
bound_tex.WrapT(TextureWrap::ClampToEdge);
bound_tex.WrapR(TextureWrap::ClampToEdge);
const char* tex_name[6] = {
"cube_0_right",
"cube_1_left",
"cube_2_top",
"cube_3_bottom",
"cube_4_front",
"cube_5_back"
};
for(GLuint i=0; i!=6; ++i)
{
Texture::Image2D(
Texture::CubeMapFace(i),
images::LoadTexture(tex_name[i], false, true)
);
}
}
UniformSampler(prog, "TexUnit").Set(0);
//
Uniform<Vec3f>(prog, "LightPos").Set(Vec3f(3.0f, 5.0f, 4.0f));
//
gl.ClearColor(0.05f, 0.2f, 0.1f, 0.0f);
gl.ClearDepth(1.0f);
gl.Enable(Capability::DepthTest);
gl.Enable(Capability::CullFace);
gl.FrontFace(make_shape.FaceWinding());
gl.CullFace(Face::Back);
}
TriangleExample(void)
: projection_matrix(prog, "ProjectionMatrix")
, camera_matrix(prog, "CameraMatrix")
, camera_position(prog, "CameraPosition")
, light_position(prog, "LightPosition")
, shape(
List("Position")("TexCoord").Get(),
shapes::Plane(
Vec3f(),
Vec3f(1.0f, 0.0f, 0.0f),
Vec3f(0.0f, 0.0f,-1.0f),
32, 32
)
)
{
VertexShader vs;
vs.Source(StrLit(
"#version 330\n"
"in vec3 Position;"
"in vec2 TexCoord;"
"out vec2 vertTexCoord;"
"void main(void)"
"{"
" gl_Position = vec4(Position, 1.0);"
" vertTexCoord = TexCoord;"
"}"
)).Compile();
prog.AttachShader(vs);
GeometryShader gs;
gs.Source(StrLit(
"#version 330\n"
"#extension GL_ARB_gpu_shader5 : enable\n"
"layout(triangles, invocations = 7) in;"
"layout(triangle_strip, max_vertices = 21) out;"
"uniform mat4 ProjectionMatrix, CameraMatrix;"
"mat4 Matrix = ProjectionMatrix * CameraMatrix;"
"uniform vec3 CameraPosition;"
"in vec2 vertTexCoord[3];"
"out gl_PerVertex {"
" vec4 gl_Position;"
" float gl_ClipDistance[3];"
"};"
"flat out mat3 geomPositionFront;"
"flat out mat3 geomTexCoordFront;"
"flat out vec3 geomWFront;"
"noperspective out vec3 geomBarycentric;"
"out vec3 geomPosition;"
"out vec3 geomTexCoord;"
"void main(void)"
"{"
" vec4 world_pos[8*3];"
" vec3 tex_coord[8*3];"
" vec4 view_pos[8*3];"
" vec3 screen_pos[8*3];"
" bool front_facing[8];"
" int ft = gl_InvocationID+1;"
" for(int pass=0; pass!=2; ++pass)"
" {"
" bool first = pass == 0;"
" if(((ft == 0) && first) || (((ft != 0) && !first)))"
" {"
" for(int v=0; v!=3; ++v)"
" {"
" int w = 2-v;"
" world_pos[0+v] = gl_in[w].gl_Position;"
" tex_coord[0+v] = vec3(vertTexCoord[w], 0.0);"
" }"
" }"
" vec4 n = vec4(-0.15 * normalize(cross("
" gl_in[1].gl_Position.xyz-gl_in[0].gl_Position.xyz,"
" gl_in[2].gl_Position.xyz-gl_in[0].gl_Position.xyz "
" )), 0.0);"
" if(((ft == 1) && first) || (((ft != 1) && !first)))"
" {"
" for(int v=0; v!=3; ++v)"
" {"
" world_pos[3+v] = gl_in[v].gl_Position + n;"
" tex_coord[3+v] = vec3(vertTexCoord[v], 1.0);"
" }"
" }"
" for(int v=0; v!=3; ++v)"
" {"
" int w = (v+1)%3;"
" int k = 2+2*v;"
" if(((ft == k) && first) || (((ft != k) && !first)))"
" {"
" world_pos[6+0+v*6] = gl_in[v].gl_Position;"
" tex_coord[6+0+v*6] = vec3(vertTexCoord[v], 0.0);"
" world_pos[6+1+v*6] = gl_in[w].gl_Position;"
" tex_coord[6+1+v*6] = vec3(vertTexCoord[w], 0.0);"
" world_pos[6+2+v*6] = gl_in[v].gl_Position + n;"
" tex_coord[6+2+v*6] = vec3(vertTexCoord[v], 1.0);"
" }"
" k = 3+2*v;"
" if(((ft == k) && first) || (((ft != k) && !first)))"
" {"
" world_pos[6+3+v*6] = gl_in[w].gl_Position;"
" tex_coord[6+3+v*6] = vec3(vertTexCoord[w], 0.0);"
" world_pos[6+4+v*6] = gl_in[w].gl_Position + n;"
" tex_coord[6+4+v*6] = vec3(vertTexCoord[w], 1.0);"
" world_pos[6+5+v*6] = gl_in[v].gl_Position + n;"
" tex_coord[6+5+v*6] = vec3(vertTexCoord[v], 1.0);"
" }"
" }"
" for(int t=first?ft:0; t!=8; ++t)"
" {"
" if(!first && (t == ft)) continue;"
" int o = t*3;"
" for(int v=0; v!=3; ++v)"
" {"
" int w = o+v;"
" view_pos[w] = Matrix * world_pos[w];"
" screen_pos[w] = view_pos[w].xyz/view_pos[w].w;"
" }"
" front_facing[t] = cross("
" screen_pos[o+1]-screen_pos[o+0],"
" screen_pos[o+2]-screen_pos[o+0] "
" ).z < 0.0;"
" if(first) break;"
" }"
" if(first && !front_facing[ft]) return;"
" }"
" int o = ft*3;"
" vec4 clip_plane[3];"
" for(int v=0; v!=3; ++v)"
" {"
" int w = (v+1)%3;"
" vec3 p0 = world_pos[o+v].xyz;"
" vec3 p1 = world_pos[o+w].xyz;"
" vec3 p2 = CameraPosition;"
" vec3 pv = normalize(cross(p1-p0, p2-p0));"
" clip_plane[v] = vec4(pv, -dot(pv, p0));"
" }"
" vec3 lo = CameraPosition;"
" vec3 p0 = world_pos[o+0].xyz;"
" vec3 pu = world_pos[o+1].xyz-p0;"
" vec3 pv = world_pos[o+2].xyz-p0;"
" vec3 lp = lo-p0;"
" float w0 = view_pos[o+0].w;"
" float wu = view_pos[o+1].w-w0;"
" float wv = view_pos[o+2].w-w0;"
" vec3 t0 = tex_coord[o+0];"
" vec3 tu = tex_coord[o+1]-t0;"
" vec3 tv = tex_coord[o+2]-t0;"
" for(int bt=0; bt!=8; ++bt)"
" {"
" int k = bt*3;"
" if((ft != bt) && !front_facing[bt])"
" {"
" for(int v=0; v!=3; ++v)"
" {"
" vec3 lt = world_pos[k+v].xyz;"
" mat3 im = mat3(lo-lt, pu, pv);"
" vec3 ic = inverse(im)*lp;"
" float s = ic.y;"
" float t = ic.z;"
" geomPositionFront[v] = p0+pu*s+pv*t;"
" geomTexCoordFront[v] = t0+tu*s+tv*t;"
" geomWFront[v] = w0+wu*s+wv*t;"
" }"
" for(int v=0; v!=3; ++v)"
" {"
" int w = k+v;"
" gl_Position = view_pos[w];"
" for(int c=0; c!=3; ++c)"
" {"
" gl_ClipDistance[c] = dot("
" clip_plane[c],"
" world_pos[w]"
" );"
" }"
" geomPosition = world_pos[w].xyz;"
" geomTexCoord = tex_coord[w];"
" geomBarycentric = vec3(0.0);"
" geomBarycentric[v] = 1.0;"
" EmitVertex();"
" }"
" EndPrimitive();"
" }"
" }"
"}"
)).Compile();
prog.AttachShader(gs);
FragmentShader fs;
fs.Source(StrLit(
"#version 330\n"
"uniform float Time;"
"uniform sampler2D ColorMap;"
"uniform sampler2D BumpMap;"
"uniform vec3 LightPosition;"
"flat in mat3 geomPositionFront;"
"flat in mat3 geomTexCoordFront;"
"flat in vec3 geomWFront;"
"noperspective in vec3 geomBarycentric;"
"in vec3 geomPosition;"
"in vec3 geomTexCoord;"
"out vec3 fragColor;"
"vec3 vcdiv(vec3 a, vec3 b)"
"{"
" return vec3(a.x/b.x, a.y/b.y, a.z/b.z);"
"}"
"void main(void)"
"{"
" const vec3 one = vec3(1.0, 1.0, 1.0);"
" vec3 bzfv = vcdiv(geomBarycentric,geomWFront);"
" vec3 p0 = geomPosition;"
" vec3 p1 = (geomPositionFront*bzfv)/dot(one,bzfv);"
" vec3 tc0 = geomTexCoord;"
" vec3 tc1 = (geomTexCoordFront*bzfv)/dot(one,bzfv);"
" ivec2 ts = textureSize(BumpMap, 0);"
" int mts = max(ts.x, ts.y);"
" vec2 dtc = tc1.xy - tc0.xy;"
" float mdtc = max(abs(dtc.x), abs(dtc.y));"
" int nsam = max(min(int(mdtc*mts), mts/2), 1);"
" float step = 1.0 / nsam;"
" for(int s=0; s<=nsam; ++s)"
" {"
" vec3 tc = mix(tc1, tc0, s*step);"
" vec4 bm = texture(BumpMap, tc.xy);"
" if(tc.z <= bm.w)"
" {"
" vec3 p = mix(p1, p0, s*step);"
" vec3 ldir = normalize(LightPosition - p);"
" float l = max(dot(ldir, bm.xzy), 0.0)*1.3;"
" fragColor = texture(ColorMap, tc.xy).rgb*l;"
" return;"
" }"
" }"
" discard;"
"}"
)).Compile();
prog.AttachShader(fs);
prog.Link();
prog.Use();
shape.UseInProgram(prog);
auto tex_image = images::LoadTexture("stones_color_hmap");
Texture::Active(0);
try
{
UniformSampler(prog, "ColorMap").Set(0);
auto bound_tex = Bind(color_tex, Texture::Target::_2D);
bound_tex.Image2D(tex_image);
bound_tex.GenerateMipmap();
bound_tex.MinFilter(TextureMinFilter::LinearMipmapLinear);
bound_tex.MagFilter(TextureMagFilter::Linear);
bound_tex.WrapS(TextureWrap::Repeat);
bound_tex.WrapT(TextureWrap::Repeat);
}
catch(Error&){ }
Texture::Active(1);
try
{
UniformSampler(prog, "BumpMap").Set(1);
auto bound_tex = Bind(bump_tex, Texture::Target::_2D);
bound_tex.Image2D(
images::NormalMap(
tex_image,
images::NormalMap::FromAlpha()
)
);
bound_tex.GenerateMipmap();
bound_tex.MinFilter(TextureMinFilter::LinearMipmapLinear);
bound_tex.MagFilter(TextureMagFilter::Linear);
bound_tex.WrapS(TextureWrap::Repeat);
bound_tex.WrapT(TextureWrap::Repeat);
}
catch(Error&){ }
gl.ClearColor(0.1f, 0.1f, 0.1f, 0.0f);
gl.ClearDepth(1.0f);
gl.Enable(Capability::DepthTest);
gl.Disable(Capability::CullFace);
gl.Enable(Functionality::ClipDistance, 0);
gl.Enable(Functionality::ClipDistance, 1);
gl.Enable(Functionality::ClipDistance, 2);
}
TessellationExample(void)
: shape_instr(make_shape.Instructions(PrimitiveType::Patches))
, shape_indices(make_shape.Indices())
, vs(ObjectDesc("Vertex"))
, cs(ObjectDesc("Tessellation Control"))
, es(ObjectDesc("Tessellation Evaluation"))
, gs(ObjectDesc("Geometry"))
, fs(ObjectDesc("Fragment"))
, projection_matrix(prog, "ProjectionMatrix")
, camera_matrix(prog, "CameraMatrix")
, model_matrix(prog, "ModelMatrix")
, offset(prog, "Offset")
, view_position(prog, "ViewPosition")
, viewport_dimensions(prog, "ViewportDimensions")
{
vs.Source(
"#version 330\n"
"uniform vec3 ViewPosition;"
"in vec3 Position;"
"out vec3 vertPosition;"
"out float vertDistance;"
"void main(void)"
"{"
" vertPosition = Position;"
" vertDistance = length(ViewPosition - vertPosition);"
"}"
);
vs.Compile();
cs.Source(
"#version 330\n"
"#extension ARB_tessellation_shader : enable\n"
"layout(vertices = 3) out;"
"in vec3 vertPosition[];"
"in float vertDistance[];"
"out vec3 tecoPosition[];"
"int tessLevel(float dist)"
"{"
" return int(9.0 / sqrt(dist+0.1));"
"}"
"void main(void)"
"{"
" tecoPosition[gl_InvocationID] ="
" vertPosition[gl_InvocationID];"
" if(gl_InvocationID == 0)"
" {"
" gl_TessLevelInner[0] = tessLevel(("
" vertDistance[0]+"
" vertDistance[1]+"
" vertDistance[2] "
" )*0.333);"
" gl_TessLevelOuter[0] = tessLevel(("
" vertDistance[1]+"
" vertDistance[2] "
" )*0.5);"
" gl_TessLevelOuter[1] = tessLevel(("
" vertDistance[2]+"
" vertDistance[0] "
" )*0.5);"
" gl_TessLevelOuter[2] = tessLevel(("
" vertDistance[0]+"
" vertDistance[1] "
" )*0.5);"
" }"
"}"
);
cs.Compile();
es.Source(
"#version 330\n"
"#extension ARB_tessellation_shader : enable\n"
"layout(triangles, equal_spacing, ccw) in;"
"const vec3 LightPosition = vec3(12.0, 10.0, 7.0);"
"uniform mat4 ProjectionMatrix, CameraMatrix, ModelMatrix;"
"in vec3 tecoPosition[];"
"out vec3 teevNormal;"
"out vec3 teevLightDir;"
"void main(void)"
"{"
" vec3 p0 = gl_TessCoord.x * tecoPosition[0];"
" vec3 p1 = gl_TessCoord.y * tecoPosition[1];"
" vec3 p2 = gl_TessCoord.z * tecoPosition[2];"
" vec4 tempPosition = vec4(normalize(p0+p1+p2), 0.0);"
" teevNormal = (ModelMatrix * tempPosition).xyz;"
" tempPosition.w = 1.0;"
" tempPosition = ModelMatrix * tempPosition;"
" teevLightDir = LightPosition - tempPosition.xyz;"
" gl_Position = "
" ProjectionMatrix *"
" CameraMatrix *"
" tempPosition;"
"}"
);
es.Compile();
gs.Source(
"#version 330\n"
"layout (triangles) in;"
"layout (triangle_strip, max_vertices = 3) out;"
"uniform vec3 Offset;"
"uniform vec2 ViewportDimensions;"
"in vec3 teevNormal[], teevLightDir[];"
"noperspective out vec3 geomDist;"
"flat out vec3 geomNormal;"
"out vec3 geomColor;"
"out vec3 geomLightDir;"
"void main(void)"
"{"
" geomNormal = normalize("
" teevNormal[0]+"
" teevNormal[1]+"
" teevNormal[2]"
" );"
" vec2 ScreenPos[3];"
" for(int i=0; i!=3; ++i)"
" {"
" ScreenPos[i] = "
" ViewportDimensions*"
" gl_in[i].gl_Position.xy/"
" gl_in[i].gl_Position.w;"
" }"
" vec2 TmpVect[3];"
" for(int i=0; i!=3; ++i)"
" {"
" TmpVect[i] = "
" ScreenPos[(i+2)%3]-"
" ScreenPos[(i+1)%3];"
" }"
" const vec3 EdgeMask[3] = vec3[3]("
" vec3(1.0, 0.0, 0.0),"
" vec3(0.0, 1.0, 0.0),"
" vec3(0.0, 0.0, 1.0) "
" );"
" for(int i=0; i!=3; ++i)"
" {"
" float Dist = abs("
" TmpVect[(i+1)%3].x*TmpVect[(i+2)%3].y-"
" TmpVect[(i+1)%3].y*TmpVect[(i+2)%3].x "
" ) / length(TmpVect[i]);"
" vec3 DistVect = vec3(Dist, Dist, Dist);"
" gl_Position = gl_in[i].gl_Position;"
" geomColor = normalize(abs("
" vec3(2.0, 2.0, 2.0)-"
" teevNormal[i]-"
" Offset"
" ));"
" geomLightDir = teevLightDir[i];"
" geomDist = EdgeMask[i] * DistVect;"
" EmitVertex();"
" }"
" EndPrimitive();"
"}"
);
gs.Compile();
fs.Source(
"#version 330\n"
"noperspective in vec3 geomDist;"
"flat in vec3 geomNormal;"
"in vec3 geomColor;"
"in vec3 geomLightDir;"
"out vec3 fragColor;"
"void main(void)"
"{"
" float MinDist = min(min(geomDist.x,geomDist.y),geomDist.z);"
" float EdgeAlpha = exp2(-pow(MinDist, 2.0));"
" const float Ambient = 0.8;"
" float Diffuse = max(dot("
" normalize(geomNormal),"
" normalize(geomLightDir)"
" ), 0.0);"
" vec3 FaceColor = geomColor * (Diffuse + Ambient);"
" const vec3 EdgeColor = vec3(0.0, 0.0, 0.0);"
" fragColor = mix(FaceColor, EdgeColor, EdgeAlpha);"
"}"
);
fs.Compile();
prog.AttachShader(vs);
prog.AttachShader(cs);
prog.AttachShader(es);
prog.AttachShader(gs);
prog.AttachShader(fs);
prog.Link();
prog.Use();
shape.Bind();
verts.Bind(Buffer::Target::Array);
{
std::vector<GLfloat> data;
GLuint n_per_vertex = make_shape.Positions(data);
Buffer::Data(Buffer::Target::Array, data);
VertexAttribArray attr(prog, "Position");
attr.Setup<GLfloat>(n_per_vertex);
attr.Enable();
indices.Bind(Buffer::Target::ElementArray);
Buffer::Data(Buffer::Target::ElementArray, shape_indices);
shape_indices.clear();
}
//
gl.ClearColor(0.8f, 0.8f, 0.8f, 0.0f);
gl.ClearDepth(1.0f);
gl.Enable(Capability::DepthTest);
prog.Use();
}
BlenderMeshExample(int argc, const char* argv[])
: prog()
, camera_matrix(prog, "CameraMatrix")
, light_position(prog, "LightPosition")
, camera_position(prog, "CameraPosition")
, face_normals(prog, "FaceNormals")
, element_count(0)
{
using namespace oglplus;
VertexShader vs;
vs.Source(
"#version 330\n"
"uniform mat4 CameraMatrix, ProjectionMatrix;"
"uniform vec3 LightPosition, CameraPosition;"
"mat4 Matrix = ProjectionMatrix * CameraMatrix;"
"in vec3 Position;"
"in vec3 Normal;"
"out vec3 vertNormal;"
"out vec3 vertLightDir;"
"out vec3 vertViewDir;"
"void main(void)"
"{"
" vertNormal = Normal;"
" vertLightDir = LightPosition - Position;"
" vertViewDir = CameraPosition - Position;"
" gl_Position = Matrix * vec4(Position, 1.0);"
"}"
);
vs.Compile();
prog.AttachShader(vs);
GeometryShader gs;
gs.Source(
"#version 330\n"
"layout (triangles) in;"
"layout (triangle_strip, max_vertices=3) out;"
"uniform bool FaceNormals;"
"in vec3 vertNormal[3];"
"in vec3 vertLightDir[3];"
"in vec3 vertViewDir[3];"
"out vec3 geomNormal;"
"out vec3 geomLightDir;"
"out vec3 geomViewDir;"
"void main(void)"
"{"
" vec3 fn;"
" if(FaceNormals)"
" {"
" vec3 p0 = gl_in[0].gl_Position.xyz;"
" vec3 p1 = gl_in[1].gl_Position.xyz;"
" vec3 p2 = gl_in[2].gl_Position.xyz;"
" fn = normalize(cross(p1-p0, p2-p0));"
" }"
" for(int v=0; v!=3; ++v)"
" {"
" gl_Position = gl_in[v].gl_Position;"
" if(FaceNormals) geomNormal = fn;"
" else geomNormal = vertNormal[v];"
" geomLightDir = vertLightDir[v];"
" geomViewDir = vertViewDir[v];"
" EmitVertex();"
" }"
" EndPrimitive();"
"}"
);
gs.Compile();
prog.AttachShader(gs);
FragmentShader fs;
fs.Source(
"#version 330\n"
"in vec3 geomNormal;"
"in vec3 geomLightDir;"
"in vec3 geomViewDir;"
"out vec3 fragColor;"
"void main(void)"
"{"
" vec3 LightColor = vec3(1.0, 1.0, 1.0);"
" vec3 MatColor = vec3(0.5, 0.5, 0.5);"
" vec3 LightRefl = reflect(-geomLightDir, geomNormal);"
" float Ambient = 0.3;"
" float Diffuse = max(dot("
" normalize(geomNormal),"
" normalize(geomLightDir)"
" ), 0.0);"
" float Contour = pow((1.0 - max(dot("
" normalize(geomNormal),"
" normalize(geomViewDir)"
" )-0.1, 0.0))*1.05, 4.0);"
" float Specular = pow(clamp(dot("
" normalize(geomViewDir),"
" normalize(LightRefl)"
" )+0.005, 0.0, 0.98), 64.0);"
" fragColor = MatColor * LightColor * (Contour + Diffuse + Ambient)+"
" LightColor * Specular;"
"}"
);
fs.Compile();
prog.AttachShader(fs);
prog.Link();
prog.Use();
gl.PrimitiveRestartIndex(0);
// vectors with vertex position and normals
// the values at index 0 is unused
// 0 is used as primitive restart index
std::vector<GLfloat> pos_data(3, 0.0);
std::vector<GLfloat> nml_data(3, 0.0);
// index offset starting at 1
GLuint index_offset = 1;
// vectors with vertex indices
std::vector<GLuint> idx_data(1, 0);
// open an input stream
std::ifstream input(argc>1? argv[1]: "./test.blend");
// check if we succeeded
if(!input.good())
throw std::runtime_error("Error opening file for reading");
// parse the input stream
imports::BlendFile blend_file(input);
// get the file's global block
auto glob_block = blend_file.StructuredGlobalBlock();
// get the default scene
auto scene_data = blend_file[glob_block.curscene];
//
// get the pointer to the first object in the scene
auto object_link_ptr = scene_data.Field<void*>("base.first").Get();
// and go through the whole list of objects
while(object_link_ptr)
{
// for each list element open the linked list block
auto object_link_data = blend_file[object_link_ptr];
// get the pointer to its object
auto object_ptr = object_link_data.Field<void*>("object").Get();
// open the object block (if any)
if(object_ptr) try
{
auto object_data = blend_file[object_ptr];
// get the data pointer
auto object_data_ptr = object_data.Field<void*>("data").Get();
// open the data block (if any)
if(object_data_ptr)
{
auto object_data_data = blend_file[object_data_ptr];
// if it is a mesh
if(object_data_data.StructureName() == "Mesh")
{
// get the object matrix field
auto object_obmat_field = object_data.Field<float>("obmat");
// make a transformation matrix
Mat4f obmat(
object_obmat_field.Get(0, 0),
object_obmat_field.Get(0, 4),
object_obmat_field.Get(0, 8),
object_obmat_field.Get(0,12),
object_obmat_field.Get(0, 1),
object_obmat_field.Get(0, 5),
object_obmat_field.Get(0, 9),
object_obmat_field.Get(0,13),
object_obmat_field.Get(0, 2),
object_obmat_field.Get(0, 6),
object_obmat_field.Get(0,10),
object_obmat_field.Get(0,14),
object_obmat_field.Get(0, 3),
object_obmat_field.Get(0, 7),
object_obmat_field.Get(0,11),
object_obmat_field.Get(0,15)
);
// the number of vertices
std::size_t n_verts = 0;
// get the vertex block pointer
auto vertex_ptr = object_data_data.Field<void*>("mvert").Get();
// open the vertex block (if any)
if(vertex_ptr)
{
auto vertex_data = blend_file[vertex_ptr];
// get the number of vertices in the block
n_verts = vertex_data.BlockElementCount();
// get the vertex coordinate and normal fields
auto vertex_co_field = vertex_data.Field<float>("co");
auto vertex_no_field = vertex_data.Field<short>("no");
// make two vectors of position and normal data
std::vector<GLfloat> ps(3 * n_verts);
std::vector<GLfloat> ns(3 * n_verts);
for(std::size_t v=0; v!=n_verts; ++v)
{
// (transpose y and z axes)
// get the positional coordinates
Vec4f position(
vertex_co_field.Get(v, 0),
vertex_co_field.Get(v, 1),
vertex_co_field.Get(v, 2),
1.0f
);
Vec4f newpos = obmat * position;
ps[3*v+0] = newpos.x();
ps[3*v+1] = newpos.z();
ps[3*v+2] =-newpos.y();
// get the normals
Vec4f normal(
vertex_no_field.Get(v, 0),
vertex_no_field.Get(v, 1),
vertex_no_field.Get(v, 2),
0.0f
);
Vec4f newnorm = obmat * normal;
ns[3*v+0] = newnorm.x();
ns[3*v+1] = newnorm.z();
ns[3*v+2] =-newnorm.y();
}
// append the values
pos_data.insert(pos_data.end(), ps.begin(), ps.end());
nml_data.insert(nml_data.end(), ns.begin(), ns.end());
}
// get the face block pointer
auto face_ptr = object_data_data.Field<void*>("mface").Get();
// open the face block (if any)
if(face_ptr)
{
auto face_data = blend_file[face_ptr];
// get the number of faces in the block
std::size_t n_faces = face_data.BlockElementCount();
// get the vertex index fields of the face
auto face_v1_field = face_data.Field<int>("v1");
auto face_v2_field = face_data.Field<int>("v2");
auto face_v3_field = face_data.Field<int>("v3");
auto face_v4_field = face_data.Field<int>("v4");
// make a vector of index data
std::vector<GLuint> is(5 * n_faces);
for(std::size_t f=0; f!=n_faces; ++f)
{
// get face vertex indices
int v1 = face_v1_field.Get(f);
int v2 = face_v2_field.Get(f);
int v3 = face_v3_field.Get(f);
int v4 = face_v4_field.Get(f);
is[5*f+0] = v1+index_offset;
is[5*f+1] = v2+index_offset;
is[5*f+2] = v3+index_offset;
is[5*f+3] = v4?v4+index_offset:0;
is[5*f+4] = 0; // primitive restart index
}
// append the values
idx_data.insert(idx_data.end(), is.begin(), is.end());
}
// get the poly block pointer
auto poly_ptr = object_data_data.TryGet<void*>("mpoly", nullptr);
// and the loop block pointer
auto loop_ptr = object_data_data.TryGet<void*>("mloop", nullptr);
// open the poly and loop blocks (if we have both)
if(poly_ptr && loop_ptr)
{
auto poly_data = blend_file[poly_ptr];
auto loop_data = blend_file[loop_ptr];
// get the number of polys in the block
std::size_t n_polys = poly_data.BlockElementCount();
// get the fields of poly and loop
auto poly_loopstart_field = poly_data.Field<int>("loopstart");
auto poly_totloop_field = poly_data.Field<int>("totloop");
auto loop_v_field = loop_data.Field<int>("v");
// make a vector of index data
std::vector<GLuint> is;
for(std::size_t f=0; f!=n_polys; ++f)
{
int ls = poly_loopstart_field.Get(f);
int tl = poly_totloop_field.Get(f);
for(int l=0; l!=tl; ++l)
{
int v = loop_v_field.Get(ls+l);
is.push_back(v+index_offset);
}
is.push_back(0); // primitive restart index
}
// append the values
idx_data.insert(idx_data.end(), is.begin(), is.end());
}
index_offset += n_verts;
}
}
}
catch(...)
{ }
// and get the pointer to the nex block
object_link_ptr = object_link_data.Field<void*>("next").Get();
}
meshes.Bind();
positions.Bind(Buffer::Target::Array);
{
Buffer::Data(Buffer::Target::Array, pos_data);
VertexAttribArray attr(prog, "Position");
attr.Setup<GLfloat>(3);
attr.Enable();
}
normals.Bind(Buffer::Target::Array);
{
Buffer::Data(Buffer::Target::Array, nml_data);
VertexAttribArray attr(prog, "Normal");
attr.Setup<GLfloat>(3);
attr.Enable();
}
indices.Bind(Buffer::Target::ElementArray);
Buffer::Data(Buffer::Target::ElementArray, idx_data);
element_count = idx_data.size();
// find the extremes of the mesh(es)
GLfloat min_x = pos_data[3], max_x = pos_data[3];
GLfloat min_y = pos_data[4], max_y = pos_data[4];
GLfloat min_z = pos_data[5], max_z = pos_data[5];
for(std::size_t v=1, vn=pos_data.size()/3; v!=vn; ++v)
{
GLfloat x = pos_data[v*3+0];
GLfloat y = pos_data[v*3+1];
GLfloat z = pos_data[v*3+2];
if(min_x > x) min_x = x;
if(min_y > y) min_y = y;
if(min_z > z) min_z = z;
if(max_x < x) max_x = x;
if(max_y < y) max_y = y;
if(max_z < z) max_z = z;
}
// position the camera target
camera_target = Vec3f(
(min_x + max_x) * 0.5,
(min_y + max_y) * 0.5,
(min_z + max_z) * 0.5
);
// and calculate a good value for camera distance
camera_distance = 1.1*Distance(camera_target, Vec3f(min_x, min_y, min_z))+1.0;
gl.ClearColor(0.17f, 0.22f, 0.17f, 0.0f);
gl.ClearDepth(1.0f);
gl.Enable(Capability::DepthTest);
gl.Enable(Capability::PrimitiveRestart);
}
LandscapeExample(void)
: grid_side(8)
, make_plane(
Vec3f(0.0f, 0.0f, 0.0f),
Vec3f(1.0f, 0.0f, 0.0f),
Vec3f(0.0f, 0.0f,-1.0f),
grid_side, grid_side
), plane_instr(make_plane.Instructions())
, plane_indices(make_plane.Indices())
, projection_matrix(prog, "ProjectionMatrix")
, camera_matrix(prog, "CameraMatrix")
, vc_int(prog, "vc_int")
, gc_int(prog, "gc_int")
, fc_int(prog, "fc_int")
{
VertexShader vs;
vs.Source(StrLit(
"#version 420\n"
"uniform mat4 ProjectionMatrix, CameraMatrix;"
"layout(binding = 0, offset = 0) uniform atomic_uint vc;"
"const float mult = 1.0/128.0;"
"uniform float vc_int;"
"in vec4 Position;"
"out vec3 vertColor;"
"void main(void)"
"{"
" gl_Position = "
" ProjectionMatrix *"
" CameraMatrix *"
" Position;"
" vertColor = vec3("
" fract(atomicCounterIncrement(vc)*mult),"
" 0.0,"
" 0.0 "
" )*max(vc_int, 0.0);"
"}"
));
vs.Compile();
prog.AttachShader(vs);
GeometryShader gs;
gs.Source(StrLit(
"#version 420\n"
"layout (triangles) in;"
"layout (triangle_strip, max_vertices = 3) out;"
"layout(binding = 0, offset = 4) uniform atomic_uint gc;"
"const float mult = 1.0/128.0;"
"uniform float gc_int;"
"in vec3 vertColor[3];"
"out vec3 geomColor;"
"void main(void)"
"{"
" vec3 Color = vec3("
" 0.0,"
" fract(atomicCounterIncrement(gc)*mult),"
" 0.0 "
" )*max(gc_int, 0.0);"
" for(int v=0; v!=3; ++v)"
" {"
" gl_Position = gl_in[v].gl_Position;"
" geomColor = vertColor[v] + Color;"
" EmitVertex();"
" }"
" EndPrimitive();"
"}"
));
gs.Compile();
prog.AttachShader(gs);
FragmentShader fs;
fs.Source(StrLit(
"#version 420\n"
"layout(binding = 0, offset = 8) uniform atomic_uint fc;"
"const float mult = 1.0/4096.0;"
"uniform float fc_int;"
"in vec3 geomColor;"
"out vec3 fragColor;"
"void main(void)"
"{"
" vec3 Color = vec3("
" 0.0,"
" 0.0,"
" sqrt(fract(atomicCounterIncrement(fc)*mult))"
" )*max(fc_int, 0.0);"
" fragColor = geomColor + Color;"
"}"
));
fs.Compile();
prog.AttachShader(fs);
prog.Link();
prog.Use();
// bind the VAO for the plane
plane.Bind();
// bind the VBO for the plane vertices
positions.Bind(Buffer::Target::Array);
{
std::vector<GLfloat> data;
GLuint n_per_vertex = make_plane.Positions(data);
// upload the data
Buffer::Data(Buffer::Target::Array, data);
// setup the vertex attribs array for the vertices
VertexAttribArray attr(prog, "Position");
attr.Setup<GLfloat>(n_per_vertex);
attr.Enable();
}
counters.Bind(Buffer::Target::AtomicCounter);
{
const GLuint tmp[3] = {0u, 0u, 0u};
Buffer::Data(
Buffer::Target::AtomicCounter,
3, tmp,
BufferUsage::DynamicDraw
);
}
counters.BindBase(Buffer::IndexedTarget::AtomicCounter, 0);
gl.ClearColor(0.2f, 0.2f, 0.2f, 0.0f);
gl.ClearDepth(1.0f);
gl.Enable(Capability::DepthTest);
plane.Bind();
}
static Program make() {
Program prog;
StrCRef vs_src(
"#version 150\n"
"uniform mat4 ModelMatrix;"
"in vec4 Position;"
"in vec3 Normal;"
"in vec3 Tangent;"
"in vec2 TexCoord;"
"out vec3 vertNormal;"
"out vec3 vertTangent;"
"out vec2 vertTexCoord;"
"void main()"
"{"
" gl_Position = ModelMatrix * Position;"
" vertNormal = mat3(ModelMatrix) * Normal;"
" vertTangent = mat3(ModelMatrix) * Tangent;"
" vertTexCoord = vec2(4.0*TexCoord.x,2.0*TexCoord.y+TexCoord.x);"
"}");
VertexShader vs;
vs.Source(vs_src).Compile();
prog.AttachShader(vs);
StrCRef gs_src(
"#version 150\n"
"#extension GL_ARB_gpu_shader5 : enable\n"
"layout(triangles, invocations = 28) in;"
"layout(triangle_strip, max_vertices = 6) out;"
"uniform mat4 ProjectionMatrix, CameraMatrix;"
"mat4 Matrix = ProjectionMatrix * CameraMatrix;"
"uniform vec3 CameraPosition;"
"const float WindingDirection = -1;"
"const float ShellHeight = 0.1;"
"in vec3 vertNormal[3];"
"in vec3 vertTangent[3];"
"in vec2 vertTexCoord[3];"
"out gl_PerVertex {"
" vec4 gl_Position;"
" float gl_ClipDistance[3];"
"};"
"flat out mat3 geomPositionFront;"
"flat out mat3 geomNormalFront;"
"flat out mat3 geomTangentFront;"
"flat out mat3 geomTexCoordFront;"
"flat out vec3 geomWFront;"
"noperspective out vec3 geomBarycentric;"
"out vec3 geomPosition;"
"out vec3 geomNormal;"
"out vec3 geomTangent;"
"out vec3 geomTexCoord;"
"mat3x4 get_world_pos(int id)"
"{"
" mat3x4 result;"
" id -= 2;"
" if(id == -2)"
" {"
" for(int v=0; v!=3; ++v)"
" {"
" result[v] = gl_in[2-v].gl_Position;"
" }"
" }"
" else if(id == -1)"
" {"
" for(int v=0; v!=3; ++v)"
" {"
" result[v] = gl_in[v].gl_Position+"
" vec4(ShellHeight*vertNormal[v], 0.0);"
" }"
" }"
" else"
" {"
" int v = id/2;"
" int w = (v+1)%3;"
" if(id % 2 == 0)"
" {"
" result[0] = gl_in[v].gl_Position;"
" result[1] = gl_in[w].gl_Position;"
" result[2] = gl_in[v].gl_Position+"
" vec4(ShellHeight*vertNormal[v], 0.0);"
" }"
" else"
" {"
" result[0] = gl_in[w].gl_Position;"
" result[1] = gl_in[w].gl_Position+"
" vec4(ShellHeight*vertNormal[w], 0.0);"
" result[2] = gl_in[v].gl_Position+"
" vec4(ShellHeight*vertNormal[v], 0.0);"
" }"
" }"
" return result;"
"}"
"mat3x4 get_view_pos(mat3x4 pos)"
"{"
" for(int v=0; v!=3; ++v)"
" pos[v] = Matrix * pos[v];"
" return pos;"
"}"
"mat3 get_screen_pos(mat3x4 pos)"
"{"
" mat3 res;"
" for(int v=0; v!=3; ++v)"
" res[v] = pos[v].xyz/pos[v].w;"
" return res;"
"}"
"bool is_front_facing(mat3x4 view_pos)"
"{"
" mat3 screen_pos = get_screen_pos(view_pos);"
" return WindingDirection * cross("
" screen_pos[1]-screen_pos[0],"
" screen_pos[2]-screen_pos[0] "
" ).z < 0.0;"
"}"
"mat3 get_tex_coords(int id)"
"{"
" mat3 result;"
" id -= 2;"
" if(id == -2)"
" {"
" for(int v=0; v!=3; ++v)"
" {"
" result[v] = vec3(vertTexCoord[2-v], 0.0);"
" }"
" }"
" else if(id == -1)"
" {"
" for(int v=0; v!=3; ++v)"
" {"
" result[v] = vec3(vertTexCoord[v], 1.0);"
" }"
" }"
" else"
" {"
" int v = id/2;"
" int w = (v+1)%3;"
" if(id % 2 == 0)"
" {"
" result[0] = vec3(vertTexCoord[v], 0.0);"
" result[1] = vec3(vertTexCoord[w], 0.0);"
" result[2] = vec3(vertTexCoord[v], 1.0);"
" }"
" else"
" {"
" result[0] = vec3(vertTexCoord[w], 0.0);"
" result[1] = vec3(vertTexCoord[w], 1.0);"
" result[2] = vec3(vertTexCoord[v], 1.0);"
" }"
" }"
" return result;"
"}"
"mat3 get_vectors(int id, vec3 attrib[3])"
"{"
" mat3 result;"
" id -= 2;"
" if(id == -2)"
" {"
" for(int v=0; v!=3; ++v)"
" {"
" result[v] = attrib[2-v];"
" }"
" }"
" else if(id == -1)"
" {"
" for(int v=0; v!=3; ++v)"
" {"
" result[v] = attrib[v];"
" }"
" }"
" else"
" {"
" int v = id/2;"
" int w = (v+1)%3;"
" if(id % 2 == 0)"
" {"
" result[0] = attrib[v];"
" result[1] = attrib[w];"
" result[2] = attrib[v];"
" }"
" else"
" {"
" result[0] = attrib[w];"
" result[1] = attrib[w];"
" result[2] = attrib[v];"
" }"
" }"
" return result;"
"}"
"void main()"
"{"
" int ft = gl_InvocationID/4+1;"
" mat3x4 world_pos_f = get_world_pos(ft);"
" mat3x4 view_pos_f = get_view_pos(world_pos_f);"
" if(!is_front_facing(view_pos_f)) return;"
" int bt[2];"
" bt[0] = (gl_InvocationID%4)*2;"
" bt[1] = bt[0]+1;"
" mat3x4 world_pos[2];"
" mat3x4 view_pos[2];"
" bool front_facing[2];"
" for(int b=0; b!=2; ++b)"
" {"
" if(ft == bt[b])"
" {"
" front_facing[b] = true;"
" }"
" else"
" {"
" world_pos[b] = get_world_pos(bt[b]);"
" view_pos[b] = get_view_pos(world_pos[b]);"
" front_facing[b] = is_front_facing(view_pos[b]);"
" }"
" }"
" if(front_facing[0] && front_facing[1]) return;"
" vec4 clip_plane[3];"
" for(int v=0; v!=3; ++v)"
" {"
" int w = (v+1)%3;"
" vec3 p0 = world_pos_f[v].xyz;"
" vec3 p1 = world_pos_f[w].xyz;"
" vec3 p2 = CameraPosition;"
" vec3 pv = WindingDirection*normalize(cross(p1-p0, p2-p0));"
" clip_plane[v] = vec4(pv, -dot(pv, p0));"
" }"
" vec3 lo = CameraPosition;"
" vec3 p0 = world_pos_f[0].xyz;"
" vec3 pu = world_pos_f[1].xyz-p0;"
" vec3 pv = world_pos_f[2].xyz-p0;"
" vec3 lp = lo-p0;"
" float w0 = view_pos_f[0].w;"
" float wu = view_pos_f[1].w-w0;"
" float wv = view_pos_f[2].w-w0;"
" mat3 normal_f = get_vectors(ft, vertNormal);"
" vec3 n0 = normal_f[0];"
" vec3 nu = normal_f[1]-n0;"
" vec3 nv = normal_f[2]-n0;"
" mat3 tangent_f = get_vectors(ft, vertTangent);"
" vec3 t0 = tangent_f[0];"
" vec3 tu = tangent_f[1]-t0;"
" vec3 tv = tangent_f[2]-t0;"
" mat3 tex_coord_f = get_tex_coords(ft);"
" vec3 tc0 = tex_coord_f[0];"
" vec3 tcu = tex_coord_f[1]-tc0;"
" vec3 tcv = tex_coord_f[2]-tc0;"
" for(int b=0; b!=2; ++b)"
" {"
" if(front_facing[b]) continue;"
" for(int v=0; v!=3; ++v)"
" {"
" vec3 lt = world_pos[b][v].xyz;"
" mat3 im = mat3(lo-lt, pu, pv);"
" vec3 ic = inverse(im)*lp;"
" float s = ic.y;"
" float t = ic.z;"
" geomPositionFront[v] = p0+pu*s+pv*t;"
" geomNormalFront[v] = n0+nu*s+nv*t;"
" geomTangentFront[v] = t0+tu*s+tv*t;"
" geomTexCoordFront[v] = tc0+tcu*s+tcv*t;"
" geomWFront[v] = w0+wu*s+wv*t;"
" }"
" mat3 normal = get_vectors(bt[b], vertNormal);"
" mat3 tangent = get_vectors(bt[b], vertTangent);"
" mat3 tex_coord = get_tex_coords(bt[b]);"
" for(int v=0; v!=3; ++v)"
" {"
" gl_Position = view_pos[b][v];"
" for(int c=0; c!=3; ++c)"
" {"
" gl_ClipDistance[c] = dot("
" clip_plane[c],"
" world_pos[b][v]"
" );"
" }"
" geomPosition = world_pos[b][v].xyz;"
" geomNormal = normal[v];"
" geomTangent = tangent[v];"
" geomTexCoord = tex_coord[v];"
" geomBarycentric = vec3(0.0);"
" geomBarycentric[v] = 1.0;"
" EmitVertex();"
" }"
" EndPrimitive();"
" }"
"}");
GeometryShader gs;
gs.Source(gs_src).Compile();
prog.AttachShader(gs);
StrCRef fs_src(
"#version 150\n"
"#extension GL_EXT_gpu_shader4_1 : enable\n"
"uniform float Time;"
"uniform sampler2D ColorMap;"
"uniform sampler2D BumpMap;"
"uniform vec3 LightPosition;"
"flat in mat3 geomPositionFront;"
"flat in mat3 geomNormalFront;"
"flat in mat3 geomTangentFront;"
"flat in mat3 geomTexCoordFront;"
"flat in vec3 geomWFront;"
"noperspective in vec3 geomBarycentric;"
"in vec3 geomPosition;"
"in vec3 geomNormal;"
"in vec3 geomTangent;"
"in vec3 geomTexCoord;"
"out vec3 fragColor;"
"vec3 vcdiv(vec3 a, vec3 b)"
"{"
" return vec3(a.x/b.x, a.y/b.y, a.z/b.z);"
"}"
"void main()"
"{"
" const vec3 one = vec3(1.0, 1.0, 1.0);"
" vec3 bzfv = vcdiv(geomBarycentric,geomWFront);"
" float idobzfv = 1.0/dot(one,bzfv);"
" vec3 p0 = geomPosition;"
" vec3 p1 = (geomPositionFront*bzfv)*idobzfv;"
" vec3 n0 = geomNormal;"
" vec3 n1 = (geomNormalFront*bzfv)*idobzfv;"
" vec3 t0 = geomTangent;"
" vec3 t1 = (geomTangentFront*bzfv)*idobzfv;"
" vec3 tc0 = geomTexCoord;"
" vec3 tc1 = (geomTexCoordFront*bzfv)*idobzfv;"
" float tl = textureQueryLod(BumpMap, tc1.xy).x;"
" ivec2 ts = textureSize(BumpMap, int(tl));"
" int mts = max(ts.x, ts.y);"
" vec2 dtc = tc1.xy - tc0.xy;"
" float mdtc = max(abs(dtc.x), abs(dtc.y));"
" int nsam = max(min(int(mdtc*mts), mts), 1);"
" float step = 1.0 / nsam;"
" for(int s=0; s<=nsam; ++s)"
" {"
" vec3 tc = mix(tc1, tc0, s*step);"
" vec4 bm = texture(BumpMap, tc.xy);"
" if(tc.z <= bm.w+0.01)"
" {"
" vec3 p = mix(p1, p0, s*step);"
" vec3 n = mix(n1, n0, s*step);"
" vec3 t = mix(t1, t0, s*step);"
" vec3 b = cross(n, t);"
" vec3 ldir = normalize(LightPosition - p);"
" vec3 nml = normalize(t*bm.x+b*bm.y+n*bm.z);"
" float l = max(dot(ldir, nml), 0.0)*max(dot(ldir, n)+0.3, "
"0.0)+0.2;"
" fragColor = texture(ColorMap, tc.xy).rgb*l;"
" return;"
" }"
" }"
" discard;"
"}");
FragmentShader fs;
fs.Source(fs_src).Compile();
prog.AttachShader(fs);
prog.Link();
prog.Use();
return prog;
}
HaloExample(void)
: make_shape()
, shape_indices(make_shape.Indices())
, shape_instr(make_shape.Instructions())
, vs_shape(ObjectDesc("Shape VS"))
, vs_plane(ObjectDesc("Plane VS"))
, fs_shape(ObjectDesc("Shape FS"))
, fs_plane(ObjectDesc("Plane FS"))
, vs_halo(ObjectDesc("Halo VS"))
, gs_halo(ObjectDesc("Halo GS"))
, fs_halo(ObjectDesc("Halo FS"))
, shape_projection_matrix(shape_prog, "ProjectionMatrix")
, shape_camera_matrix(shape_prog, "CameraMatrix")
, shape_model_matrix(shape_prog, "ModelMatrix")
, plane_projection_matrix(plane_prog, "ProjectionMatrix")
, plane_camera_matrix(plane_prog, "CameraMatrix")
, halo_projection_matrix(halo_prog, "ProjectionMatrix")
, halo_camera_matrix(halo_prog, "CameraMatrix")
, halo_model_matrix(halo_prog, "ModelMatrix")
{
vs_shape.Source(
"#version 140\n"
"in vec4 Position;"
"in vec3 Normal;"
"uniform mat4 ProjectionMatrix, CameraMatrix, ModelMatrix;"
"uniform vec3 LightPos;"
"out vec3 vertNormal;"
"out vec3 vertViewNormal;"
"out vec3 vertLight;"
"void main(void)"
"{"
" gl_Position = ModelMatrix * Position;"
" vertNormal = mat3(ModelMatrix)*Normal;"
" vertViewNormal = mat3(CameraMatrix)*vertNormal;"
" vertLight = LightPos - gl_Position.xyz;"
" gl_Position = ProjectionMatrix * CameraMatrix * gl_Position;"
"}"
);
vs_shape.Compile();
fs_shape.Source(
"#version 140\n"
"in vec3 vertNormal;"
"in vec3 vertViewNormal;"
"in vec3 vertLight;"
"uniform mat4 CameraMatrix;"
"out vec4 fragColor;"
"void main(void)"
"{"
" float ltlen = sqrt(length(vertLight));"
" float ltexp = dot("
" normalize(vertNormal),"
" normalize(vertLight)"
" );"
" float lview = dot("
" normalize(vertLight),"
" normalize(vec3("
" CameraMatrix[0][2],"
" CameraMatrix[1][2],"
" CameraMatrix[2][2] "
" ))"
" );"
" float depth = normalize(vertViewNormal).z;"
" vec3 ftrefl = vec3(0.9, 0.8, 0.7);"
" vec3 scatter = vec3(0.9, 0.6, 0.1);"
" vec3 bklt = vec3(0.8, 0.6, 0.4);"
" vec3 ambient = vec3(0.5, 0.4, 0.3);"
" fragColor = vec4("
" pow(max(ltexp, 0.0), 8.0)*ftrefl+"
" ( ltexp+1.0)/ltlen*pow(depth,2.0)*scatter+"
" (-ltexp+1.0)/ltlen*(1.0-depth)*scatter+"
" (-lview+1.0)*0.6*(1.0-abs(depth))*bklt+"
" 0.2*ambient,"
" 1.0"
" );"
"}"
);
fs_shape.Compile();
shape_prog.AttachShader(vs_shape);
shape_prog.AttachShader(fs_shape);
shape_prog.Link();
vs_plane.Source(
"#version 140\n"
"in vec4 Position;"
"in vec3 Normal;"
"uniform mat4 ProjectionMatrix, CameraMatrix;"
"uniform vec3 LightPos;"
"out vec3 vertNormal;"
"out vec3 vertLight;"
"void main(void)"
"{"
" gl_Position = "
" ProjectionMatrix *"
" CameraMatrix *"
" Position;"
" vertNormal = Normal;"
" vertLight = LightPos-Position.xyz;"
"}"
);
vs_plane.Compile();
fs_plane.Source(
"#version 140\n"
"in vec3 vertNormal;"
"in vec3 vertLight;"
"out vec4 fragColor;"
"void main(void)"
"{"
" float l = sqrt(length(vertLight));"
" float e = dot("
" vertNormal,"
" normalize(vertLight)"
" );"
" float d = l > 0.0 ? e / l : 0.0;"
" float i = 0.2 + 2.5 * d;"
" fragColor = vec4(0.8*i, 0.7*i, 0.4*i, 1.0);"
"}"
);
fs_plane.Compile();
plane_prog.AttachShader(vs_plane);
plane_prog.AttachShader(fs_plane);
plane_prog.Link();
vs_halo.Source(
"#version 150\n"
"in vec4 Position;"
"in vec3 Normal;"
"uniform mat4 ModelMatrix, CameraMatrix;"
"out vec3 vertNormal;"
"out float vd;"
"void main(void)"
"{"
" gl_Position = "
" CameraMatrix *"
" ModelMatrix *"
" Position;"
" vertNormal = ("
" CameraMatrix *"
" ModelMatrix *"
" vec4(Normal, 0.0)"
" ).xyz;"
" vd = vertNormal.z;"
"}"
);
vs_halo.Compile();
gs_halo.Source(
"#version 150\n"
"layout(triangles) in;"
"layout(triangle_strip, max_vertices = 12) out;"
"in vec3 vertNormal[];"
"in float vd[];"
"uniform mat4 CameraMatrix, ProjectionMatrix;"
"uniform vec3 LightPos;"
"out float geomAlpha;"
"void main(void)"
"{"
" for(int v=0; v!=3; ++v)"
" {"
" int a = v, b = (v+1)%3, c = (v+2)%3;"
" vec4 pa = gl_in[a].gl_Position;"
" vec4 pb = gl_in[b].gl_Position;"
" vec4 pc = gl_in[c].gl_Position;"
" vec4 px, py;"
" vec3 na = vertNormal[a];"
" vec3 nb = vertNormal[b];"
" vec3 nc = vertNormal[c];"
" vec3 nx, ny;"
" if(vd[a] == 0.0 && vd[b] == 0.0)"
" {"
" px = pa;"
" nx = na;"
" py = pb;"
" ny = nb;"
" }"
" else if(vd[a] > 0.0 && vd[b] < 0.0)"
" {"
" float x = vd[a]/(vd[a]-vd[b]);"
" float y;"
" px = mix(pa, pb, x);"
" nx = mix(na, nb, x);"
" if(vd[c] < 0.0)"
" {"
" y = vd[a]/(vd[a]-vd[c]);"
" py = mix(pa, pc, y);"
" ny = mix(na, nc, y);"
" }"
" else"
" {"
" y = vd[c]/(vd[c]-vd[b]);"
" py = mix(pc, pb, y);"
" ny = mix(nc, nb, y);"
" }"
" }"
" else continue;"
" vec4 gx1 = vec4(px.xyz, 1.0);"
" vec4 gy1 = vec4(py.xyz, 1.0);"
" vec4 gx2 = vec4(px.xyz + nx*0.3, 1.0);"
" vec4 gy2 = vec4(py.xyz + ny*0.3, 1.0);"
" gl_Position = ProjectionMatrix * gy1;"
" geomAlpha = 1.0;"
" EmitVertex();"
" gl_Position = ProjectionMatrix * gx1;"
" geomAlpha = 1.0;"
" EmitVertex();"
" gl_Position = ProjectionMatrix * gy2;"
" geomAlpha = 0.0;"
" EmitVertex();"
" gl_Position = ProjectionMatrix * gx2;"
" geomAlpha = 0.0;"
" EmitVertex();"
" EndPrimitive();"
" break;"
" }"
"}"
);
gs_halo.Compile();
fs_halo.Source(
"#version 150\n"
"in float geomAlpha;"
"out vec4 fragColor;"
"void main(void)"
"{"
" fragColor = vec4("
" 0.5, 0.4, 0.3,"
" pow(geomAlpha, 2.0)"
" );"
"}"
);
fs_halo.Compile();
halo_prog.AttachShader(vs_halo);
halo_prog.AttachShader(gs_halo);
halo_prog.AttachShader(fs_halo);
halo_prog.Link();
// bind the VAO for the shape
shape.Bind();
// bind the VBO for the shape vertices
shape_verts.Bind(Buffer::Target::Array);
{
std::vector<GLfloat> data;
GLuint n_per_vertex = make_shape.Positions(data);
Buffer::Data(Buffer::Target::Array, data);
VertexAttribSlot location;
if(VertexArrayAttrib::QueryCommonLocation(
MakeGroup(shape_prog, halo_prog),
"Position",
location
))
{
VertexArrayAttrib attr(location);
attr.Setup<GLfloat>(n_per_vertex);
attr.Enable();
}
else OGLPLUS_ABORT("Inconsistent 'Position' location");
}
// bind the VBO for the shape normals
shape_normals.Bind(Buffer::Target::Array);
{
std::vector<GLfloat> data;
GLuint n_per_vertex = make_shape.Normals(data);
Buffer::Data(Buffer::Target::Array, data);
shape_prog.Use();
VertexArrayAttrib attr(shape_prog, "Normal");
attr.Setup<GLfloat>(n_per_vertex);
attr.Enable();
}
// bind the VAO for the plane
plane.Bind();
// bind the VBO for the plane vertices
plane_verts.Bind(Buffer::Target::Array);
{
GLfloat data[4*3] = {
-9.0f, 0.0f, 9.0f,
-9.0f, 0.0f, -9.0f,
9.0f, 0.0f, 9.0f,
9.0f, 0.0f, -9.0f
};
Buffer::Data(Buffer::Target::Array, 4*3, data);
plane_prog.Use();
VertexArrayAttrib attr(plane_prog, "Position");
attr.Setup<Vec3f>();
attr.Enable();
}
// bind the VBO for the plane normals
plane_normals.Bind(Buffer::Target::Array);
{
GLfloat data[4*3] = {
-0.1f, 1.0f, 0.1f,
-0.1f, 1.0f, -0.1f,
0.1f, 1.0f, 0.1f,
0.1f, 1.0f, -0.1f
};
Buffer::Data(Buffer::Target::Array, 4*3, data);
plane_prog.Use();
VertexArrayAttrib attr(plane_prog, "Normal");
attr.Setup<Vec3f>();
attr.Enable();
}
Vec3f lightPos(2.0f, 2.5f, 9.0f);
ProgramUniform<Vec3f>(shape_prog, "LightPos").Set(lightPos);
ProgramUniform<Vec3f>(plane_prog, "LightPos").Set(lightPos);
gl.ClearColor(0.2f, 0.2f, 0.2f, 0.0f);
gl.ClearDepth(1.0f);
gl.ClearStencil(0);
gl.Enable(Capability::DepthTest);
gl.BlendFunc(BlendFn::SrcAlpha, BlendFn::One);
}
ParticlesExample(void)
: projection_matrix(prog, "ProjectionMatrix")
, camera_matrix(prog, "CameraMatrix")
, particle_count(100)
, prev_time(0.0)
, prev_spawn(0.0)
{
// Set the vertex shader source
vs.Source(
"#version 330\n"
"uniform mat4 ModelMatrix, CameraMatrix;"
"in vec4 Position;"
"in float Age;"
"out float vertAge;"
"void main(void)"
"{"
" gl_Position = "
" CameraMatrix *"
" ModelMatrix *"
" Position;"
" vertAge = Age;"
"}"
);
// compile it
vs.Compile();
// Set the geometry shader source
gs.Source(
"#version 330\n"
"layout(points) in;"
"layout(triangle_strip, max_vertices = 4) out;"
"uniform mat4 ProjectionMatrix;"
"in float vertAge[];"
"out float geomAge;"
"void main(void)"
"{"
" float s = 0.5;"
" float yo[2] = float[2](-1.0, 1.0);"
" float xo[2] = float[2](-1.0, 1.0);"
" for(int j=0;j!=2;++j)"
" for(int i=0;i!=2;++i)"
" {"
" float xoffs = xo[i]*(1.0+vertAge[0])*s;"
" float yoffs = yo[j]*(1.0+vertAge[0])*s;"
" gl_Position = ProjectionMatrix * vec4("
" gl_in[0].gl_Position.x-xoffs,"
" gl_in[0].gl_Position.y-yoffs,"
" gl_in[0].gl_Position.z,"
" 1.0"
" );"
" geomAge = vertAge[0];"
" EmitVertex();"
" }"
" EndPrimitive();"
"}"
);
// compile it
gs.Compile();
// set the fragment shader source
fs.Source(
"#version 330\n"
"in float geomAge;"
"out vec4 fragColor;"
"void main(void)"
"{"
" vec3 Color1 = vec3(1.0, 0.5, 0.5);"
" vec3 Color2 = vec3(0.3, 0.1, 0.1);"
" fragColor = vec4("
" mix(Color1, Color2, geomAge),"
" 1.0 - geomAge"
" );"
"}"
);
// compile it
fs.Compile();
// attach the shaders to the program
prog.AttachShader(vs);
prog.AttachShader(gs);
prog.AttachShader(fs);
// link and use it
prog.Link();
prog.Use();
// bind the VAO for the particles
particles.Bind();
// bind the VBO for the particle positions
pos_buf.Bind(Buffer::Target::Array);
{
Buffer::Data(Buffer::Target::Array, positions);
VertexAttribArray attr(prog, "Position");
attr.Setup(3, DataType::Float);
attr.Enable();
}
positions.reserve(particle_count);
directions.reserve(particle_count);
// bind the VBO for the particle ages
age_buf.Bind(Buffer::Target::Array);
{
Buffer::Data(Buffer::Target::Array, ages);
VertexAttribArray attr(prog, "Age");
attr.Setup(1, DataType::Float);
attr.Enable();
}
ages.reserve(particle_count);
Uniform<Mat4f>(prog, "ModelMatrix").Set(
ModelMatrixf::Translation(0.0f, -10.0f, 0.0f)
);
//
gl.ClearColor(0.9f, 0.9f, 0.9f, 0.0f);
gl.ClearDepth(1.0f);
gl.Enable(Capability::DepthTest);
gl.Enable(Capability::Blend);
gl.BlendFunc(BlendFn::SrcAlpha, BlendFn::OneMinusSrcAlpha);
}