SphereExample(void)
: sphere_instr(make_sphere.Instructions())
, sphere_indices(make_sphere.Indices())
, hole_count(50)
, hole_diameter(0.30f)
{
// This shader will be used in transform fedback mode
// to transform the vertices used to "cut out the holes"
// the same way the sphere is transformed
vs_tfb.Source(
"#version 330\n"
"uniform mat4 CameraMatrix, ModelMatrix;"
"uniform float Diameter;"
"in vec3 Hole;"
"out vec3 vertTransfHole;"
"void main(void)"
"{"
" vertTransfHole = ("
" CameraMatrix *"
" ModelMatrix *"
" vec4(Hole * (1.0 + 0.5 * Diameter), 0.0)"
" ).xyz;"
"}"
);
// compile, setup transform feedback output variables
// link and use the program
vs_tfb.Compile();
prog_tfb.AttachShader(vs_tfb);
const GLchar* var_name = "vertTransfHole";
prog_tfb.TransformFeedbackVaryings(
1, &var_name,
TransformFeedbackMode::InterleavedAttribs
);
prog_tfb.Link();
prog_tfb.Use();
Uniform<GLfloat> diameter(prog_tfb, "Diameter");
diameter.Set(hole_diameter);
// bind the VAO for the holes
holes.Bind();
// bind the VBO for the hole vertices
hole_verts.Bind(Buffer::Target::Array);
// and the VBO for the transformed hole vertices captured by tfb
transf_hole_verts.Bind(Buffer::Target::TransformFeedback);
{
std::vector<GLfloat> data;
make_hole_data(data, hole_count);
Buffer::Data(Buffer::Target::TransformFeedback, data);
Buffer::Data(Buffer::Target::Array, data);
VertexAttribArray attr(prog_tfb, "Hole");
attr.Setup<Vec3f>();
attr.Enable();
}
transf_hole_verts.BindBase(
Buffer::IndexedTarget::TransformFeedback,
0
);
// Set the vertex shader source
vs.Source(
"#version 330\n"
"uniform mat4 ProjectionMatrix, CameraMatrix, ModelMatrix;"
"in vec4 Position;"
"in vec3 Normal;"
"out vec3 vertNormal;"
"out vec3 vertLight;"
"const vec3 LightPos = vec3(2.0, 3.0, 3.0);"
"void main(void)"
"{"
" gl_Position = ModelMatrix * Position;"
" vertNormal = mat3(ModelMatrix)*Normal;"
" vertLight = LightPos-gl_Position.xyz;"
" gl_Position = ProjectionMatrix * CameraMatrix * gl_Position;"
"}"
);
// compile it
vs.Compile();
// set the fragment shader source
fs.Source(
"#version 330\n"
"in vec3 vertNormal;"
"in vec3 vertLight;"
"out vec4 fragColor;"
"const int HoleCount = 50;"
"uniform vec3 TransfHole[50];"
"uniform float Diameter;"
"void main(void)"
"{"
" int imax = 0;"
" float dmax = -1.0;"
" for(int i=0; i!=HoleCount; ++i)"
" {"
" float d = dot(vertNormal, TransfHole[i]);"
" if(dmax < d)"
" {"
" dmax = d;"
" imax = i;"
" }"
" }"
" float l = length(vertLight);"
" vec3 FragDiff = TransfHole[imax] - vertNormal;"
" vec3 FinalNormal = "
" length(FragDiff) > Diameter?"
" vertNormal:"
" normalize(FragDiff+vertNormal*Diameter);"
" float i = (l > 0.0) ? dot("
" FinalNormal, "
" normalize(vertLight)"
" ) / l : 0.0;"
" i = 0.2+max(i*2.5, 0.0);"
" fragColor = vec4(i, i, i, 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();
diameter.Set(hole_diameter);
// bind the VAO for the sphere
sphere.Bind();
// bind the VBO for the sphere vertices
verts.Bind(Buffer::Target::Array);
{
std::vector<GLfloat> data;
GLuint n_per_vertex = make_sphere.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();
}
// bind the VBO for the sphere normals
normals.Bind(Buffer::Target::Array);
{
std::vector<GLfloat> data;
GLuint n_per_vertex = make_sphere.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<GLfloat>(n_per_vertex);
attr.Enable();
}
gl.ClearColor(0.8f, 0.8f, 0.7f, 0.0f);
gl.ClearDepth(1.0f);
gl.Enable(Capability::DepthTest);
}
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);
}
SphereExample(void)
: sphere_instr(make_sphere.Instructions())
, sphere_indices(make_sphere.Indices())
, projection_matrix(prog, "ProjectionMatrix")
, camera_matrix(prog, "CameraMatrix")
{
// Vertex shader
VertexShader vs;
// Set the vertex shader source and compile it
vs.Source(
"#version 330\n"
"uniform mat4 ProjectionMatrix, CameraMatrix;"
"layout(location = 0) in vec4 Position;"
"layout(location = 1) in vec2 TexCoord;"
"out vec2 vertTexCoord;"
"void main(void)"
"{"
" vertTexCoord = TexCoord;"
" gl_Position = "
" ProjectionMatrix *"
" CameraMatrix *"
" Position;"
"}"
).Compile();
// Fragment shader
FragmentShader fs;
// set the fragment shader source and compile it
fs.Source(
"#version 330\n"
"in vec2 vertTexCoord;"
"out vec4 fragColor;"
"void main(void)"
"{"
" float i = ("
" int(vertTexCoord.x*18) % 2+"
" int(vertTexCoord.y*14) % 2"
" ) % 2;"
" fragColor = vec4(1-i/2, 1-i/2, 1-i/2, 1.0);"
"}"
).Compile();
// attach the shaders to the program
prog.AttachShader(vs).AttachShader(fs);
// link and use it
prog.Link().Use();
// bind the VAO for the sphere
sphere.Bind();
// bind the VBO for the sphere vertices
verts.Bind(Buffer::Target::Array);
{
std::vector<GLfloat> data;
GLuint n_per_vertex = make_sphere.Positions(data);
// upload the data
Buffer::Data(Buffer::Target::Array, data);
// setup the vertex attribs array for the vertices
// (prog|0) is equivalent to VertexAttribArray(prog, VertexAtribSlot(0))
(prog|0).Setup<GLfloat>(n_per_vertex).Enable();
}
// bind the VBO for the sphere UV-coordinates
texcoords.Bind(Buffer::Target::Array);
{
std::vector<GLfloat> data;
GLuint n_per_vertex = make_sphere.TexCoordinates(data);
// upload the data
Buffer::Data(Buffer::Target::Array, data);
// setup the vertex attribs array for the vertices
// (prog|1) is equivalent to VertexAttribArray(prog, VertexAtribSlot(1))
(prog|1).Setup<GLfloat>(n_per_vertex).Enable();
}
//
gl.ClearColor(0.8f, 0.8f, 0.7f, 0.0f);
gl.ClearDepth(1.0f);
Capability::DepthTest << true;
}
SphereExample(void)
: sphere_instr(make_sphere.Instructions())
, sphere_indices(make_sphere.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 vec2 TexCoord;"
"out vec2 vertTexCoord;"
"void main(void)"
"{"
" vertTexCoord = TexCoord;"
" gl_Position = "
" ProjectionMatrix *"
" CameraMatrix *"
" ModelMatrix *"
" Position;"
"}"
);
// compile it
vs.Compile();
// set the fragment shader source
fs.Source(
"#version 330\n"
"in vec2 vertTexCoord;"
"out vec4 fragColor;"
"void main(void)"
"{"
" float i = int(("
" vertTexCoord.x+"
" vertTexCoord.y "
" )*16) % 2;"
" fragColor = mix("
" vec4(0.9, 0.9, 0.9, 1.0),"
" vec4(1.0, 0.3, 0.4, 1.0),"
" i"
" );"
"}"
);
// 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 sphere
sphere.Bind();
// bind the VBO for the sphere vertices
verts.Bind(Buffer::Target::Array);
{
std::vector<GLfloat> data;
GLuint n_per_vertex = make_sphere.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 sphere UV-coordinates
texcoords.Bind(Buffer::Target::Array);
{
std::vector<GLfloat> data;
GLuint n_per_vertex = make_sphere.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();
}
//
gl.ClearColor(0.8f, 0.8f, 0.7f, 0.0f);
gl.ClearDepth(1.0f);
gl.Enable(Capability::DepthTest);
}