CubeExample(void)
: cube_instr(make_cube.Instructions())
, cube_indices(make_cube.Indices())
, light_pos(prog, "LightPos")
, projection_matrix(prog, "ProjectionMatrix")
, tex_projection_matrix(prog, "TexProjectionMatrix")
, model_matrix(prog, "ModelMatrix")
{
// Set the vertex shader source
vs.Source(
"#version 330\n"
"uniform mat4 ProjectionMatrix, CameraMatrix, ModelMatrix;"
"uniform mat4 TexProjectionMatrix;"
"in vec4 Position;"
"in vec3 Normal;"
"out vec3 vertNormal;"
"out vec3 vertLight;"
"out vec4 vertTexCoord;"
"uniform vec3 LightPos;"
"void main(void)"
"{"
" vertNormal = ("
" ModelMatrix *"
" vec4(-Normal, 0.0)"
" ).xyz;"
" vertLight = ("
" vec4(LightPos, 0.0)-"
" ModelMatrix * Position"
" ).xyz;"
" vertTexCoord = "
" TexProjectionMatrix *"
" ModelMatrix *"
" Position;"
" gl_Position = "
" ProjectionMatrix *"
" CameraMatrix *"
" ModelMatrix *"
" Position;"
"}"
);
// compile it
vs.Compile();
// set the fragment shader source
fs.Source(
"#version 330\n"
"uniform sampler2D TexUnit;"
"in vec3 vertNormal;"
"in vec3 vertLight;"
"in vec4 vertTexCoord;"
"out vec4 fragColor;"
"void main(void)"
"{"
" float l = length(vertLight);"
" float d = l != 0.0 ? dot("
" vertNormal, "
" normalize(vertLight)"
" ) / l : 0.0;"
" float i = 0.1 + 4.2*max(d, 0.0);"
" vec2 coord = vertTexCoord.st/vertTexCoord.q;"
" vec4 t = texture(TexUnit, coord*0.5 + 0.5);"
" fragColor = vec4(t.rgb*i*sqrt(1.0-t.a), 1.0);"
"}"
);
// compile it
fs.Compile();
// attach the shaders to the program
prog.AttachShader(vs);
prog.AttachShader(fs);
// link and use it
prog.Link();
prog.Use();
// bind the VAO for the cube
cube.Bind();
verts.Bind(Buffer::Target::Array);
{
std::vector<GLfloat> data;
GLuint n_per_vertex = make_cube.Positions(data);
Buffer::Data(Buffer::Target::Array, data);
VertexArrayAttrib 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_cube.Normals(data);
Buffer::Data(Buffer::Target::Array, data);
VertexArrayAttrib attr(prog, "Normal");
attr.Setup<GLfloat>(n_per_vertex);
attr.Enable();
}
// setup the texture
gl.Direct(Texture::Target::_2D, tex)
.Image2D(images::LoadTexture("flower_glass"))
.GenerateMipmap()
.BorderColor(Vec4f(1.0f, 1.0f, 1.0f, 0.0f))
.MinFilter(TextureMinFilter::LinearMipmapLinear)
.MagFilter(TextureMagFilter::Linear)
.WrapS(TextureWrap::ClampToBorder)
.WrapT(TextureWrap::ClampToBorder)
.Bind();
UniformSampler(prog, "TexUnit").Set(0);
Uniform<Mat4f>(prog, "CameraMatrix").Set(
CamMatrixf::LookingAt(Vec3f(0.0f, 1.0f, 2.0f), Vec3f())
);
gl.ClearColor(0.1f, 0.1f, 0.1f, 0.0f);
gl.ClearDepth(1.0f);
gl.Enable(Capability::DepthTest);
gl.Enable(Capability::CullFace);
gl.FrontFace(make_cube.FaceWinding());
}
CubeExample(void)
: cube_instr(make_cube.Instructions())
, cube_indices(make_cube.Indices())
, projection_matrix(prog, "ProjectionMatrix")
, camera_matrix(prog, "CameraMatrix")
, model_matrix(prog, "ModelMatrix")
{
// Set the vertex shader source
vs.Source(
"#version 330\n"
"uniform mat4 ProjectionMatrix, CameraMatrix, ModelMatrix;"
"in vec4 Position;"
"in vec3 Normal;"
"in vec2 TexCoord;"
"out vec3 vertNormal;"
"out vec3 vertLight;"
"out vec2 vertTexCoord;"
"uniform vec3 LightPos;"
"void main(void)"
"{"
" vertNormal = mat3(ModelMatrix)*Normal;"
" gl_Position = ModelMatrix * Position;"
" vertLight = LightPos - gl_Position.xyz;"
" vertTexCoord = TexCoord * 6.0;"
" gl_Position = ProjectionMatrix * CameraMatrix * gl_Position;"
"}"
);
// compile it
vs.Compile();
// set the fragment shader source
fs.Source(
"#version 330\n"
"uniform sampler2D TexUnit;"
"in vec3 vertNormal;"
"in vec3 vertLight;"
"in vec2 vertTexCoord;"
"out vec4 fragColor;"
"void main(void)"
"{"
" float l = dot(vertLight, vertLight);"
" float d = l != 0.0 ? dot("
" vertNormal, "
" normalize(vertLight)"
" ) / l : 0.0;"
" vec3 c = vec3(0.9, 0.8, 0.2);"
" vec4 t = texture(TexUnit, vertTexCoord);"
" float a = 1.0 - sqrt(abs(d)), e;"
" if(gl_FrontFacing)"
" {"
" e = d >= 0.0 ?"
" d * mix(0.5, 1.0, t.a):"
" (-0.9*d) * (1.0 - t.a);"
" }"
" else"
" {"
" e = d >= 0.0 ?"
" (0.6*d) * (1.0 - t.a):"
" (-0.7*d) * mix(0.5, 1.0, t.a);"
" }"
" float i = 0.1 + 9.0*e;"
" fragColor = vec4("
" t.r*c.r*i, "
" t.g*c.g*i, "
" t.b*c.b*i, "
" clamp(pow(t.a,2) + a*0.4, 0.0, 1.0)"
" );"
"}"
);
// compile it
fs.Compile();
// attach the shaders to the program
prog.AttachShader(vs);
prog.AttachShader(fs);
// link and use it
prog.Link();
prog.Use();
// bind the VAO for the cube
cube.Bind();
verts.Bind(Buffer::Target::Array);
{
std::vector<GLfloat> data;
GLuint n_per_vertex = make_cube.Positions(data);
Buffer::Data(Buffer::Target::Array, data);
VertexAttribArray attr(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_cube.Normals(data);
Buffer::Data(Buffer::Target::Array, data);
VertexAttribArray attr(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_cube.TexCoordinates(data);
Buffer::Data(Buffer::Target::Array, data);
VertexAttribArray attr(prog, "TexCoord");
attr.Setup(n_per_vertex, DataType::Float);
attr.Enable();
}
// setup the texture
{
auto bound_tex = Bind(tex, Texture::Target::_2D);
bound_tex.Image2D(images::LoadTexture("honeycomb"));
bound_tex.GenerateMipmap();
bound_tex.MinFilter(TextureMinFilter::LinearMipmapLinear);
bound_tex.MagFilter(TextureMagFilter::Linear);
bound_tex.WrapS(TextureWrap::MirroredRepeat);
bound_tex.WrapT(TextureWrap::MirroredRepeat);
}
//
UniformSampler(prog, "TexUnit").Set(0);
Uniform<Vec3f>(prog, "LightPos").Set(Vec3f(1.0f, 2.0f, 3.0f));
//
gl.ClearColor(0.1f, 0.1f, 0.1f, 0.0f);
gl.ClearDepth(1.0f);
gl.Enable(Capability::DepthTest);
gl.Enable(Capability::Blend);
gl.BlendFunc(
BlendFn::SrcAlpha,
BlendFn::OneMinusSrcAlpha
);
gl.Enable(Capability::CullFace);
gl.FrontFace(make_cube.FaceWinding());
}
TorusExample(void)
: make_torus()
, torus_instr(make_torus.Instructions())
, torus_indices(make_torus.Indices())
{
// Set the vertex shader source
vs.Source(
"#version 150\n"
"uniform mat4 ProjectionMatrix, CameraMatrix;"
"in vec4 Position;"
"in vec3 Normal;"
"in vec3 Color;"
"out vec3 vertColor;"
"out vec3 vertNormal;"
"out vec3 vertViewDir;"
"void main(void)"
"{"
" vertColor = normalize(vec3(1,1,1)-Color);"
" vertNormal = Normal;"
" vertViewDir = ("
" vec4(0.0, 0.0, 1.0, 1.0)*"
" CameraMatrix"
" ).xyz;"
" gl_Position = "
" ProjectionMatrix *"
" CameraMatrix *"
" Position;"
"}"
);
// compile it
vs.Compile();
// set the fragment shader source
fs.Source(
"#version 150\n"
"in vec3 vertColor;"
"in vec3 vertNormal;"
"in vec3 vertViewDir;"
"out vec4 fragColor;"
"uniform vec3 LightPos[3];"
"void main(void)"
"{"
" float amb = 0.2;"
" float diff = 0.0;"
" float spec = 0.0;"
" for(int i=0;i!=3;++i)"
" {"
" diff += max("
" dot(vertNormal, LightPos[i])/"
" dot(LightPos[i], LightPos[i]),"
" 0.0"
" );"
" float k = dot(vertNormal, LightPos[i]);"
" vec3 r = 2.0*k*vertNormal - LightPos[i];"
" spec += pow(max("
" dot(normalize(r), vertViewDir),"
" 0.0"
" ), 32.0 * dot(r, r));"
" }"
" fragColor = "
" vec4(vertColor, 1.0)*(amb+diff)+"
" vec4(1.0, 1.0, 1.0, 1.0)*spec;"
"}"
);
// compile it
fs.Compile();
// attach the shaders to the program
prog.AttachShader(vs);
prog.AttachShader(fs);
// link and use it
prog.Link();
prog.Use();
// bind the VAO for the torus
torus.Bind();
// bind the VBO for the torus vertex positions
positions.Bind(Buffer::Target::Array);
{
std::vector<GLfloat> data;
GLuint n_per_vertex = make_torus.Positions(data);
// upload the data
Buffer::Data(Buffer::Target::Array, data);
// setup the vertex attribs array for the vertices
VertexArrayAttrib attr(prog, "Position");
attr.Setup<GLfloat>(n_per_vertex);
attr.Enable();
}
// bind the VBO for the torus normals
normals.Bind(Buffer::Target::Array);
{
std::vector<GLfloat> data;
GLuint n_per_vertex = make_torus.Normals(data);
// upload the data
Buffer::Data(Buffer::Target::Array, data);
// setup the vertex attribs array for the vertices
VertexArrayAttrib attr(prog, "Normal");
attr.Setup<GLfloat>(n_per_vertex);
attr.Enable();
}
// bind the VBO for the torus colors
colors.Bind(Buffer::Target::Array);
{
std::vector<GLfloat> data;
GLuint n_per_vertex = make_torus.Tangents(data);
// upload the data
Buffer::Data(Buffer::Target::Array, data);
// setup the vertex attribs array for the vertices
VertexArrayAttrib attr(prog, "Color");
attr.Setup<GLfloat>(n_per_vertex);
attr.Enable();
}
// set the light positions
Uniform<Vec3f> light_pos(prog, "LightPos");
light_pos[0].Set(Vec3f(2.0f,-1.0f, 0.0f));
light_pos[1].Set(Vec3f(0.0f, 3.0f,-1.0f));
light_pos[2].Set(Vec3f(0.0f,-1.0f, 4.0f));
//
gl.ClearColor(0.8f, 0.8f, 0.7f, 0.0f);
gl.ClearDepth(1.0f);
gl.Enable(Capability::DepthTest);
gl.Enable(Capability::CullFace);
gl.FrontFace(make_torus.FaceWinding());
gl.CullFace(Face::Back);
}
TorusExample(void)
: make_torus(1.0, 0.5, 72, 48)
, torus_instr(make_torus.Instructions())
, torus_indices(make_torus.Indices())
, projection_matrix(prog, "ProjectionMatrix")
, camera_matrix(prog, "CameraMatrix")
, model_matrix(prog, "ModelMatrix")
{
// Set the vertex shader source and compile it
vs.Source(
"#version 330\n"
"uniform mat4 ProjectionMatrix, CameraMatrix, ModelMatrix;"
"in vec4 Position;"
"in vec3 Normal;"
"in vec2 TexCoord;"
"out vec3 vertNormal;"
"out vec3 vertLight;"
"out vec2 vertTexCoord;"
"uniform vec3 LightPos;"
"void main(void)"
"{"
" gl_Position = ModelMatrix * Position;"
" vertNormal = mat3(ModelMatrix)*Normal;"
" vertLight = LightPos - gl_Position.xyz;"
" vertTexCoord = TexCoord;"
" gl_Position = ProjectionMatrix * CameraMatrix * gl_Position;"
"}"
).Compile();
// set the fragment shader source and compile it
fs.Source(
"#version 330\n"
"uniform sampler2D TexUnit;"
"in vec3 vertNormal;"
"in vec3 vertLight;"
"in vec2 vertTexCoord;"
"out vec4 fragColor;"
"void main(void)"
"{"
" float l = sqrt(length(vertLight));"
" float d = l > 0? dot("
" vertNormal, "
" normalize(vertLight)"
" ) / l : 0.0;"
" float i = 0.2 + 3.2*max(d, 0.0);"
" fragColor = texture(TexUnit, vertTexCoord)*i;"
"}"
).Compile();
// attach the shaders to the program
prog.AttachShader(vs).AttachShader(fs);
// link and use it
prog.Link().Use();
// bind the VAO for the torus
torus.Bind();
// bind the VBO for the torus vertices
verts.Bind(Buffer::Target::Array);
{
std::vector<GLfloat> data;
GLuint n_per_vertex = make_torus.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);
attr.Enable();
}
// bind the VBO for the torus normals
normals.Bind(Buffer::Target::Array);
{
std::vector<GLfloat> data;
GLuint n_per_vertex = make_torus.Normals(data);
// upload the data
Buffer::Data(Buffer::Target::Array, data);
// setup the vertex attribs array for the vertices
VertexAttribArray attr(prog, "Normal");
attr.Setup(n_per_vertex, DataType::Float);
attr.Enable();
}
// bind the VBO for the torus texture coordinates
texcoords.Bind(Buffer::Target::Array);
{
std::vector<GLfloat> data;
GLuint n_per_vertex = make_torus.TexCoordinates(data);
// upload the data
Buffer::Data(Buffer::Target::Array, data);
// setup the vertex attribs array for the vertices
VertexAttribArray attr(prog, "TexCoord");
attr.Setup(n_per_vertex, DataType::Float);
attr.Enable();
}
// setup the texture
Texture::Target tex_tgt = Texture::Target::_2D;
tex.Bind(tex_tgt);
{
GLuint s = 256;
std::vector<GLubyte> tex_data(s*s);
for(GLuint v=0;v!=s;++v)
for(GLuint u=0;u!=s;++u)
tex_data[v*s+u] = rand() % 0x100;
Texture::Image2D(
tex_tgt,
0,
PixelDataInternalFormat::Red,
s, s,
0,
PixelDataFormat::Red,
PixelDataType::UnsignedByte,
tex_data.data()
);
Texture::MinFilter(tex_tgt, TextureMinFilter::Linear);
Texture::MagFilter(tex_tgt, TextureMagFilter::Linear);
Texture::WrapS(tex_tgt, TextureWrap::Repeat);
Texture::WrapT(tex_tgt, TextureWrap::Repeat);
Texture::SwizzleG(tex_tgt, TextureSwizzle::Red);
Texture::SwizzleB(tex_tgt, TextureSwizzle::Red);
}
// typechecked uniform with exact data type
// on compilers supporting strongly typed enums
// you can use:
//Typechecked<Uniform<SLtoCpp<SLDataType::Sampler2D>>>(prog, "TexUnit").Set(0);
// without strongly typed enums you need to do:
typedef SLtoCpp<OGLPLUS_CONST_ENUM_VALUE(SLDataType::Sampler2D)> GLSLsampler2D;
Typechecked<Uniform<GLSLsampler2D>>(prog, "TexUnit").Set(0);
//
Uniform<Vec3f>(prog, "LightPos").Set(4.0f, 4.0f, -8.0f);
gl.ClearColor(0.8f, 0.8f, 0.7f, 0.0f);
gl.ClearDepth(1.0f);
gl.Enable(Capability::DepthTest);
gl.Enable(Capability::CullFace);
gl.FrontFace(make_torus.FaceWinding());
gl.CullFace(Face::Back);
}
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<GLfloat>(n_per_vertex);
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<GLfloat>(n_per_vertex);
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<GLfloat>(n_per_vertex);
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());
}
CubeMapExample(void)
: shape_instr(make_shape.Instructions())
, shape_indices(make_shape.Indices())
, projection_matrix(prog, "ProjectionMatrix")
, camera_matrix(prog, "CameraMatrix")
, model_matrix(prog, "ModelMatrix")
{
// Set the vertex shader source
vs.Source(
"#version 330\n"
"uniform mat4 ProjectionMatrix, CameraMatrix, ModelMatrix;"
"in vec4 Position;"
"in vec3 Normal;"
"in vec2 TexCoord;"
"out vec3 vertNormal;"
"out vec3 vertLightDir;"
"out vec3 vertLightRefl;"
"out vec3 vertViewDir;"
"out vec3 vertViewRefl;"
"uniform vec3 LightPos;"
"void main(void)"
"{"
" gl_Position = ModelMatrix * Position;"
" vertNormal = mat3(ModelMatrix)*Normal;"
" vertLightDir = LightPos - gl_Position.xyz;"
" vertLightRefl = reflect("
" -normalize(vertLightDir),"
" normalize(vertNormal)"
" );"
" vertViewDir = ("
" vec4(0.0, 0.0, 1.0, 1.0)*"
" CameraMatrix"
" ).xyz;"
" vertViewRefl = reflect("
" normalize(vertViewDir),"
" normalize(vertNormal)"
" );"
" gl_Position = ProjectionMatrix * CameraMatrix * gl_Position;"
"}"
);
// compile it
vs.Compile();
// set the fragment shader source
fs.Source(
"#version 330\n"
"uniform samplerCube TexUnit;"
"in vec3 vertNormal;"
"in vec3 vertLightDir;"
"in vec3 vertLightRefl;"
"in vec3 vertViewDir;"
"in vec3 vertViewRefl;"
"out vec4 fragColor;"
"void main(void)"
"{"
" float l = length(vertLightDir);"
" float d = dot("
" normalize(vertNormal), "
" normalize(vertLightDir)"
" ) / l;"
" float s = dot("
" normalize(vertLightRefl),"
" normalize(vertViewDir)"
" );"
" vec3 lt = vec3(1.0, 1.0, 1.0);"
" vec3 env = texture(TexUnit, vertViewRefl).rgb;"
" fragColor = vec4("
" env * 0.4 + "
" (lt + env) * 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(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 = 256;
auto image = images::NewtonFractal(
tex_side, tex_side,
Vec3f(0.3f, 0.1f, 0.2f),
Vec3f(1.0f, 0.8f, 0.9f),
Vec2f(-1.0f, -1.0f),
Vec2f( 1.0f, 1.0f),
images::NewtonFractal::X4Minus1(),
images::NewtonFractal::DefaultMixer()
);
auto tex_target = Texture::Target::CubeMap;
// texture syntax sugar
tex << tex_target;
tex_target << TextureMinFilter::Linear;
tex_target << TextureMagFilter::Linear;
tex_target << TextureWrap::ClampToEdge;
for(int i=0; i!=6; ++i)
{
Texture::CubeMapFace(i) << image;
}
}
// typechecked uniform with the exact sampler type
// on compilers supporting strongly typed enums
// you can use:
//Typechecked<Uniform<SLtoCpp<SLDataType::SamplerCube>>>(prog, "TexUnit").Set(0);
// without strongly typed enums you need to do:
typedef SLtoCpp<OGLPLUS_CONST_ENUM_VALUE(SLDataType::SamplerCube)> GLSLsamplerCube;
Typechecked<Uniform<GLSLsamplerCube>>(prog, "TexUnit").Set(0);
//
Uniform<Vec3f>(prog, "LightPos").Set(Vec3f(3.0f, 5.0f, 4.0f));
//
gl.ClearColor(0.2f, 0.05f, 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);
}
CubeExample()
: cube_instr(make_cube.Instructions())
, cube_indices(make_cube.Indices())
, prog(make())
, projection_matrix(prog, "ProjectionMatrix")
, camera_matrix(prog, "CameraMatrix")
, model_matrix(prog, "ModelMatrix")
, light_pos(prog, "LightPos") {
// bind the VAO for the cube
gl.Bind(cube);
gl.Bind(Buffer::Target::Array, verts);
{
std::vector<GLfloat> data;
GLuint n_per_vertex = make_cube.Positions(data);
Buffer::Data(Buffer::Target::Array, data);
(prog | "Position").Setup<GLfloat>(n_per_vertex).Enable();
}
gl.Bind(Buffer::Target::Array, normals);
{
std::vector<GLfloat> data;
GLuint n_per_vertex = make_cube.Normals(data);
Buffer::Data(Buffer::Target::Array, data);
(prog | "Normal").Setup<GLfloat>(n_per_vertex).Enable();
}
gl.Bind(Buffer::Target::Array, tangents);
{
std::vector<GLfloat> data;
GLuint n_per_vertex = make_cube.Tangents(data);
Buffer::Data(Buffer::Target::Array, data);
(prog | "Tangent").Setup<GLfloat>(n_per_vertex).Enable();
}
gl.Bind(Buffer::Target::Array, texcoords);
{
std::vector<GLfloat> data;
GLuint n_per_vertex = make_cube.TexCoordinates(data);
Buffer::Data(Buffer::Target::Array, data);
(prog | "TexCoord").Setup<GLfloat>(n_per_vertex).Enable();
}
{
auto img = images::SphereBumpMap(512, 512, 2, 2);
Uniform<GLsizei>(prog, "BumpTexWidth").Set(img.Width());
Uniform<GLsizei>(prog, "BumpTexHeight").Set(img.Height());
UniformSampler(prog, "BumpTex").Set(0);
Texture::Active(0);
gl.Bound(Texture::Target::_2D, bumpTex)
.MinFilter(TextureMinFilter::LinearMipmapLinear)
.MagFilter(TextureMagFilter::Linear)
.WrapS(TextureWrap::Repeat)
.WrapT(TextureWrap::Repeat)
.Image2D(img)
.GenerateMipmap();
}
//
gl.ClearColor(0.1f, 0.1f, 0.1f, 0.0f);
gl.ClearDepth(1.0f);
gl.Enable(Capability::DepthTest);
gl.Enable(Capability::CullFace);
gl.FrontFace(make_cube.FaceWinding());
}
ShadowVolExample(const ExampleParams& params)
: shape_instr(make_shape.Instructions())
, shape_indices(make_shape.Indices())
, shape_vs(ShaderType::Vertex, ObjectDesc("Shape vertex"))
, depth_vs(ShaderType::Vertex, ObjectDesc("Depth vertex"))
, light_vs(ShaderType::Vertex, ObjectDesc("Light vertex"))
, depth_gs(ShaderType::Geometry, ObjectDesc("Depth geometry"))
, light_gs(ShaderType::Geometry, ObjectDesc("Light geometry"))
, shape_fs(ShaderType::Fragment, ObjectDesc("Shape fragment"))
, depth_fs(ShaderType::Fragment, ObjectDesc("Depthfragment"))
, light_fs(ShaderType::Fragment, ObjectDesc("Light fragment"))
, shape_prog(ObjectDesc("Shape"))
, depth_prog(ObjectDesc("Depth"))
, light_prog(ObjectDesc("Light"))
, tex_side(128)
, sample_count(params.HighQuality()?1024:128)
{
shape_vs.Source(
"#version 330\n"
"uniform mat4 ProjectionMatrix, CameraMatrix, ModelMatrix;"
"in vec4 Position;"
"in vec3 Normal;"
"in vec2 TexCoord;"
"out vec3 vertNormal;"
"out vec3 vertLightDir;"
"out vec3 vertLightRefl;"
"out vec3 vertViewDir;"
"out vec3 vertViewRefl;"
"uniform vec3 LightPos;"
"void main(void)"
"{"
" gl_Position = ModelMatrix * Position;"
" vertNormal = mat3(ModelMatrix)*Normal;"
" vertLightDir = LightPos - gl_Position.xyz;"
" vertLightRefl = reflect("
" -normalize(vertLightDir),"
" normalize(vertNormal)"
" );"
" vertViewDir = (vec4(0.0, 0.0, 1.0, 1.0)* CameraMatrix).xyz;"
" vertViewRefl = reflect("
" normalize(vertViewDir),"
" normalize(vertNormal)"
" );"
" gl_Position = ProjectionMatrix * CameraMatrix * gl_Position;"
"}"
);
shape_vs.Compile();
shape_fs.Source(
"#version 330\n"
"in vec3 vertNormal;"
"in vec3 vertLightDir;"
"in vec3 vertLightRefl;"
"in vec3 vertViewDir;"
"in vec3 vertViewRefl;"
"out vec4 fragColor;"
"void main(void)"
"{"
" float l = length(vertLightDir);"
" float d = dot("
" normalize(vertNormal), "
" normalize(vertLightDir)"
" ) / l;"
" float s = dot("
" normalize(vertLightRefl),"
" normalize(vertViewDir)"
" );"
" vec3 ambi = vec3(0.6, 0.3, 0.5);"
" vec3 diff = vec3(0.9, 0.7, 0.8);"
" vec3 spec = vec3(1.0, 0.9, 0.95);"
" fragColor = vec4("
" ambi * 0.3 + "
" diff * 0.7 * max(d, 0.0) + "
" spec * pow(max(s, 0.0), 64), "
" 1.0"
" );"
"}"
);
shape_fs.Compile();
shape_prog.AttachShader(shape_vs);
shape_prog.AttachShader(shape_fs);
shape_prog.Link();
depth_vs.Source(
"#version 330\n"
"uniform mat4 ModelMatrix;"
"uniform vec3 LightPos;"
"in vec4 Position;"
"void main(void)"
"{"
" gl_Position = "
" mat4("
" 1.0, 0.0, 0.0, -LightPos.x,"
" 0.0, 1.0, 0.0, -LightPos.y,"
" 0.0, 0.0, 1.0, -LightPos.z,"
" 0.0, 0.0, 0.0, 1.0"
" )*"
" ModelMatrix *"
" mat4("
" 10.0, 0.0, 0.0, 0.0,"
" 0.0, 10.0, 0.0, 0.0,"
" 0.0, 0.0, 10.0, 0.0,"
" 0.0, 0.0, 0.0, 1.0 "
" )*"
" Position;"
"}"
);
depth_vs.Compile();
depth_gs.Source(
"#version 330\n"
"layout(triangles) in;"
"layout(triangle_strip, max_vertices = 18) out;"
"uniform mat4 ProjectionMatrix;"
"const mat4 CubeFaceMatrix[6] = mat4[6]("
" mat4("
" 0.0, 0.0, -1.0, 0.0,"
" 0.0, -1.0, 0.0, 0.0,"
" -1.0, 0.0, 0.0, 0.0,"
" 0.0, 0.0, 0.0, 1.0 "
" ), mat4("
" 0.0, 0.0, 1.0, 0.0,"
" 0.0, -1.0, 0.0, 0.0,"
" 1.0, 0.0, 0.0, 0.0,"
" 0.0, 0.0, 0.0, 1.0 "
" ), mat4("
" 1.0, 0.0, 0.0, 0.0,"
" 0.0, 0.0, -1.0, 0.0,"
" 0.0, 1.0, 0.0, 0.0,"
" 0.0, 0.0, 0.0, 1.0 "
" ), mat4("
" 1.0, 0.0, 0.0, 0.0,"
" 0.0, 0.0, 1.0, 0.0,"
" 0.0, -1.0, 0.0, 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,"
" 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,"
" 0.0, 0.0, 0.0, 1.0 "
" )"
");"
"void main(void)"
"{"
" for(gl_Layer=0; gl_Layer!=6; ++gl_Layer)"
" {"
" for(int i=0; i!=3; ++i)"
" {"
" gl_Position = "
" ProjectionMatrix *"
" CubeFaceMatrix[gl_Layer]*"
" gl_in[i].gl_Position;"
" EmitVertex();"
" }"
" EndPrimitive();"
" }"
"}"
);
depth_gs.Compile();
depth_fs.Source(
"#version 330\n"
"void main(void)"
"{"
" gl_FragDepth = gl_FragCoord.z;"
"}"
);
depth_fs.Compile();
depth_prog.AttachShader(depth_vs);
depth_prog.AttachShader(depth_gs);
depth_prog.AttachShader(depth_fs);
depth_prog.Link();
depth_prog.Use();
Uniform<Mat4f>(depth_prog, "ProjectionMatrix").Set(
CamMatrixf::PerspectiveX(
RightAngles(1.0),
1.0,
0.1,
10.0
)
);
// bind the VAO for the shape
shape.Bind();
shape_positions.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(VertexAttribArray::QueryCommonLocation(
"Position",
location,
shape_prog,
depth_prog
))
{
VertexAttribArray shape_attr(location);
shape_attr.Setup(n_per_vertex, DataType::Float);
shape_attr.Enable();
}
else assert(!"Inconsistent 'Position' location");
}
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();
VertexAttribArray attr(shape_prog, "Normal");
attr.Setup(n_per_vertex, DataType::Float);
attr.Enable();
}
light_vs.Source(
"#version 330\n"
"in vec3 Position;"
"out float vertZOffs;"
"uniform vec3 LightPos;"
"uniform int SampleCount;"
"void main(void)"
"{"
" float hp = (SampleCount-1) * 0.5;"
" vertZOffs = (gl_InstanceID - hp)/hp;"
" gl_Position = vec4(Position + LightPos, 1.0);"
"}"
);
light_vs.Compile();
light_gs.Source(
"#version 330\n"
"layout(points) in;"
"layout(triangle_strip, max_vertices = 4) out;"
"in float vertZOffs[];"
"out vec4 geomPosition;"
"uniform mat4 CameraMatrix, ProjectionMatrix;"
"uniform vec3 ViewX, ViewY, ViewZ;"
"uniform float LightVolSize;"
"void main(void)"
"{"
" float zo = vertZOffs[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)"
" {"
" geomPosition = vec4("
" gl_in[0].gl_Position.xyz+"
" ViewX * xo[i] * LightVolSize+"
" ViewY * yo[j] * LightVolSize+"
" ViewZ * zo * LightVolSize,"
" 1.0"
" );"
" gl_Position = "
" ProjectionMatrix *"
" CameraMatrix *"
" geomPosition;"
" EmitVertex();"
" }"
" EndPrimitive();"
"}"
);
light_gs.Compile();
light_fs.Source(
"#version 330\n"
"in vec4 geomPosition;"
"out vec4 fragColor;"
"uniform samplerCubeShadow ShadowMap;"
"uniform int SampleCount;"
"uniform vec3 LightPos;"
"void main(void)"
"{"
" vec3 LightDir = geomPosition.xyz - LightPos;"
" vec4 ShadowCoord = vec4("
" normalize(LightDir),"
" length(LightDir)"
" );"
" float s = texture(ShadowMap, ShadowCoord);"
" float alpha = s / (SampleCount * pow(length(LightDir), 2));"
" fragColor = vec4(1.0, 1.0, 1.0, alpha);"
"}"
);
light_fs.Compile();
light_prog.AttachShader(light_vs);
light_prog.AttachShader(light_gs);
light_prog.AttachShader(light_fs);
light_prog.Link();
light_prog.Use();
// bind the VAO for the light volume
light.Bind();
// bind the VBO for the light volume plane positions
light_positions.Bind(Buffer::Target::Array);
{
GLfloat position[3] = {0.0, 0.0, 0.0};
Buffer::Data(Buffer::Target::Array, 3, position);
VertexAttribArray attr(light_prog, "Position");
attr.Setup(3, DataType::Float);
attr.Enable();
}
Uniform<GLint>(light_prog, "SampleCount").Set(sample_count);
Uniform<GLfloat>(light_prog, "LightVolSize").Set(4);
UniformSampler(light_prog, "ShadowMap").Set(0);
// Setup the texture and the offscreen FBO
Texture::Active(0);
{
auto bound_tex = Bind(depth_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);
bound_tex.CompareFunc(CompareFunction::LEqual);
bound_tex.CompareMode(
TextureCompareMode::CompareRefToTexture
);
for(int i=0; i!=6; ++i)
{
Texture::Image2D(
Texture::CubeMapFace(i),
0,
PixelDataInternalFormat::DepthComponent,
tex_side, tex_side,
0,
PixelDataFormat::DepthComponent,
PixelDataType::Float,
nullptr
);
}
auto bound_fbo = Bind(
depth_fbo,
Framebuffer::Target::Draw
);
bound_fbo.AttachTexture(
FramebufferAttachment::Depth,
depth_tex,
0
);
}
//
gl.ClearColor(0.2f, 0.05f, 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);
gl.BlendFunc(BlendFunction::SrcAlpha, BlendFunction::One);
}
