TorusExample(void)
: make_torus(1.0, 0.5, 36, 24)
, torus_instr(make_torus.Instructions())
, torus_indices(make_torus.Indices())
, prog(make_prog())
, projection_matrix(prog, "ProjectionMatrix")
, camera_matrix(prog, "CameraMatrix")
, model_matrix(prog, "ModelMatrix")
{
Uniform<Vec4f>(prog, "ClipPlane").Set(0.f, 0.f, 1.f, 0.f);
// 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
VertexArrayAttrib attr(prog, "Position");
attr.Setup<GLfloat>(n_per_vertex);
attr.Enable();
}
// bind the VBO for the torus UV-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
VertexArrayAttrib attr(prog, "TexCoord");
attr.Setup<GLfloat>(n_per_vertex);
attr.Enable();
}
//
gl.ClearColor(0.8f, 0.8f, 0.7f, 0.0f);
gl.ClearDepth(1.0f);
gl.FrontFace(make_torus.FaceWinding());
gl.Enable(Capability::DepthTest);
gl.Enable(Functionality::ClipDistance, 0);
}
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;"
"out vec3 vertNormal;"
"void main(void)"
"{"
" vertNormal = mat3(ModelMatrix)*Normal;"
" gl_Position = "
" ProjectionMatrix *"
" CameraMatrix *"
" ModelMatrix *"
" Position;"
"}"
).Compile();
// set the fragment shader source and compile it
fs.Source(
"#version 330\n"
"in vec3 vertNormal;"
"out vec4 fragColor;"
"uniform vec3 LightPos;"
"void main(void)"
"{"
" float intensity = 2.0 * max("
" dot(vertNormal, LightPos)/"
" length(LightPos),"
" 0.0"
" );"
" if(!gl_FrontFacing)"
" fragColor = vec4(0.0, 0.0, 0.0, 1.0);"
" else if(intensity > 0.9)"
" fragColor = vec4(1.0, 0.9, 0.8, 1.0);"
" else if(intensity > 0.1)"
" fragColor = vec4(0.7, 0.6, 0.4, 1.0);"
" else"
" fragColor = vec4(0.3, 0.2, 0.1, 1.0);"
"}"
).Compile();
// attach the shaders to the program
prog << vs << 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
(prog|"Position").Setup(n_per_vertex, DataType::Float).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
(prog|"Normal").Setup(n_per_vertex, DataType::Float).Enable();
}
//
// set the light position
(prog/"LightPos").Set(Vec3f(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);
glLineWidth(4.0f);
}
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<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
VertexAttribArray attr(prog, "Normal");
attr.Setup<GLfloat>(n_per_vertex);
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<GLfloat>(n_per_vertex);
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())
, transf_prog(make_transf_prog())
, face_prog(make_face_prog())
, frame_prog(make_frame_prog())
, projection_matrix(transf_prog, "ProjectionMatrix")
, camera_matrix(transf_prog, "CameraMatrix")
, model_matrix(transf_prog, "ModelMatrix")
, transf_time(transf_prog, "Time")
{
transf_prog.Use();
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);
VertexArrayAttrib 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);
VertexArrayAttrib 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);
VertexArrayAttrib attr(transf_prog, "TexCoord");
attr.Setup<GLfloat>(n_per_vertex);
attr.Enable();
}
face_pp.Bind();
face_prog.Use();
face_pp.UseStages(transf_prog).Vertex().Geometry();
face_pp.UseStages(face_prog).Fragment();
frame_pp.Bind();
frame_prog.Use();
frame_pp.UseStages(transf_prog).Vertex().Geometry();
frame_pp.UseStages(frame_prog).Fragment();
gl.Bind(NoProgramPipeline());
gl.Use(NoProgram());
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());
}
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;"
"out vec3 vertNormal;"
"void main(void)"
"{"
" vertNormal = mat3(CameraMatrix)*mat3(ModelMatrix)*Normal;"
" gl_Position = "
" ProjectionMatrix *"
" CameraMatrix *"
" ModelMatrix *"
" Position;"
"}"
).Compile();
// set the fragment shader source and compile it
fs.Source(
"#version 330\n"
"uniform int ColorCount;"
"uniform vec4 Color[8];"
"in vec3 vertNormal;"
"vec3 ViewDir = vec3(0.0, 0.0, 1.0);"
"vec3 TopDir = vec3(0.0, 1.0, 0.0);"
"out vec4 fragColor;"
"void main(void)"
"{"
" float k = dot(vertNormal, ViewDir);"
" vec3 reflDir = 2.0*k*vertNormal - ViewDir;"
" float a = dot(reflDir, TopDir);"
" vec3 reflColor;"
" for(int i = 0; i != (ColorCount - 1); ++i)"
" {"
" if(a<Color[i].a && a>=Color[i+1].a)"
" {"
" float m = "
" (a - Color[i].a)/"
" (Color[i+1].a-Color[i].a);"
" reflColor = mix("
" Color[i].rgb,"
" Color[i+1].rgb,"
" m"
" );"
" break;"
" }"
" }"
" float i = max(dot(vertNormal, TopDir), 0.0);"
" vec3 diffColor = vec3(i, i, i);"
" fragColor = vec4("
" mix(reflColor, diffColor, 0.3 + i*0.7),"
" 1.0"
" );"
"}"
).Compile();
// attach the shaders to the program
prog.AttachShader(vs);
prog.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).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).Enable();
}
// setup the color gradient
Uniform<GLint>(prog, "ColorCount").Set(8);
Uniform<Vec4f> color(prog, "Color");
color[0].Set(1.0f, 1.0f, 0.9f, 1.00f);
color[1].Set(1.0f, 0.9f, 0.8f, 0.97f);
color[2].Set(0.9f, 0.7f, 0.5f, 0.95f);
color[3].Set(0.5f, 0.5f, 1.0f, 0.95f);
color[4].Set(0.2f, 0.2f, 0.7f, 0.00f);
color[5].Set(0.1f, 0.1f, 0.1f, 0.00f);
color[6].Set(0.2f, 0.2f, 0.2f,-0.10f);
color[7].Set(0.5f, 0.5f, 0.5f,-1.00f);
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_torus.FaceWinding());
gl.CullFace(Face::Back);
}
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());
}
FBTexExample(void)
: make_cube()
, cube_instr(make_cube.Instructions())
, cube_indices(make_cube.Indices())
, make_torus(1.0, 0.5, 72, 48)
, torus_instr(make_torus.Instructions())
, torus_indices(make_torus.Indices())
, cube_fs(ObjectDesc("Cube fragment"))
, torus_fs(ObjectDesc("Torus fragment"))
, torus_projection_matrix(torus_prog, "ProjectionMatrix")
, torus_camera_matrix(torus_prog, "CameraMatrix")
, torus_model_matrix(torus_prog, "ModelMatrix")
, cube_projection_matrix(cube_prog, "ProjectionMatrix")
, cube_camera_matrix(cube_prog, "CameraMatrix")
, cube_model_matrix(cube_prog, "ModelMatrix")
, tex_side(512)
, width(tex_side)
, height(tex_side)
{
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;"
" gl_Position = ProjectionMatrix * CameraMatrix * gl_Position;"
"}"
);
vs.Compile();
cube_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 = 0.6 + max(d, 0.0);"
" fragColor = texture(TexUnit, vertTexCoord)*i;"
"}"
);
cube_fs.Compile();
cube_prog.AttachShader(vs);
cube_prog.AttachShader(cube_fs);
cube_prog.Link();
cube_prog.Use();
cube.Bind();
cube_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(cube_prog, "Position");
attr.Setup<GLfloat>(n_per_vertex);
attr.Enable();
}
cube_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(cube_prog, "Normal");
attr.Setup<GLfloat>(n_per_vertex);
attr.Enable();
}
cube_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(cube_prog, "TexCoord");
attr.Setup<GLfloat>(n_per_vertex);
attr.Enable();
}
UniformSampler(cube_prog, "TexUnit").Set(0);
Uniform<Vec3f>(cube_prog, "LightPos").Set(4.0f, 4.0f, -8.0f);
torus_fs.Source(
"#version 330\n"
"in vec3 vertNormal;"
"in vec3 vertLight;"
"in vec2 vertTexCoord;"
"out vec4 fragColor;"
"void main(void)"
"{"
" float d = dot("
" vertNormal, "
" normalize(vertLight)"
" );"
" float i = ("
" int(vertTexCoord.x*18) % 2+"
" int(vertTexCoord.y*14) % 2"
" ) % 2;"
" float c = (0.4 + max(d, 0.0))*(1-i/2);"
" fragColor = vec4(c, c, c, 1.0);"
"}"
);
torus_fs.Compile();
torus_prog.AttachShader(vs);
torus_prog.AttachShader(torus_fs);
torus_prog.Link();
torus_prog.Use();
torus.Bind();
torus_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(torus_prog, "Position");
attr.Setup<GLfloat>(n_per_vertex);
attr.Enable();
}
torus_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(torus_prog, "Normal");
attr.Setup<GLfloat>(n_per_vertex);
attr.Enable();
}
torus_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(torus_prog, "TexCoord");
attr.Setup<GLfloat>(n_per_vertex);
attr.Enable();
}
Uniform<Vec3f>(torus_prog, "LightPos").Set(2.0f, 3.0f, 4.0f);
{
auto bound_tex = Bind(tex, Texture::Target::_2D);
bound_tex.Image2D(
0,
PixelDataInternalFormat::RGBA,
tex_side, tex_side,
0,
PixelDataFormat::RGBA,
PixelDataType::UnsignedByte,
nullptr
);
bound_tex.MinFilter(TextureMinFilter::Linear);
bound_tex.MagFilter(TextureMagFilter::Linear);
bound_tex.WrapS(TextureWrap::Repeat);
bound_tex.WrapT(TextureWrap::Repeat);
}
{
auto bound_fbo = Bind(
fbo,
Framebuffer::Target::Draw
);
auto bound_rbo = Bind(
rbo,
Renderbuffer::Target::Renderbuffer
);
bound_rbo.Storage(
PixelDataInternalFormat::DepthComponent,
tex_side,
tex_side
);
bound_fbo.AttachTexture(
FramebufferAttachment::Color,
tex,
0
);
bound_fbo.AttachRenderbuffer(
FramebufferAttachment::Depth,
rbo
);
}
gl.Enable(Capability::DepthTest);
gl.Enable(Capability::CullFace);
gl.CullFace(Face::Back);
}
TorusExample(void)
: make_torus(1.0, 0.5, 36, 24)
, torus_instr(make_torus.Instructions())
, torus_indices(make_torus.Indices())
, make_plane(make_plane_builders())
, plane_instr(make_plane[0].Instructions())
, plane_indices(make_plane[0].Indices())
, torus_vs(ShaderType::Vertex, ObjectDesc("Torus vertex"))
, plane_vs(ShaderType::Vertex, ObjectDesc("Plane vertex"))
, torus_fs(ShaderType::Fragment, ObjectDesc("Torus fragment"))
, plane_fs(ShaderType::Fragment, ObjectDesc("Plane fragment"))
, torus_prog(ObjectDesc("Torus"))
, plane_prog(ObjectDesc("Plane"))
, plane_normal(plane_prog, "Normal")
, plane_camera_matrix(plane_prog, "CameraMatrix")
, torus_camera_matrix(torus_prog, "CameraMatrix")
, torus_model_matrix(torus_prog, "ModelMatrix")
, plane(make_plane.size())
, plane_positions(make_plane.size())
{
std::stringstream plane_count_def;
plane_count_def <<"#define PlaneCount "<<plane.size()<<'\n';
const GLchar* torus_vs_source[3] = {
"#version 330\n",
plane_count_def.str().c_str(),
"uniform mat4 ProjectionMatrix, ModelMatrix, CameraMatrix;"
"uniform float ClipSign[PlaneCount];"
"uniform vec4 ClipPlane[PlaneCount];"
"in vec4 Position;"
"in vec2 TexCoord;"
"out vec2 vertTexCoord;"
"void main(void)"
"{"
" vertTexCoord = TexCoord;"
" gl_Position = "
" ModelMatrix *"
" Position;"
" for(int p=0; p!=PlaneCount; ++p)"
" {"
" gl_ClipDistance[p] = "
" ClipSign[p]* "
" dot(ClipPlane[p], gl_Position);"
" }"
" gl_Position = "
" ProjectionMatrix *"
" CameraMatrix *"
" gl_Position;"
"}"
};
torus_vs.Source(torus_vs_source, 3);
torus_vs.Compile();
torus_fs.Source(
"#version 330\n"
"in vec2 vertTexCoord;"
"out vec4 fragColor;"
"void main(void)"
"{"
" float i = ("
" int(vertTexCoord.x*36) % 2+"
" int(vertTexCoord.y*24) % 2"
" ) % 2;"
" fragColor = vec4(1-i/2, 1-i/2, 1-i/2, 1.0);"
"}"
);
torus_fs.Compile();
torus_prog.AttachShader(torus_vs);
torus_prog.AttachShader(torus_fs);
torus_prog.Link();
torus_prog.Use();
// bind the VAO for the torus
torus.Bind();
// bind the VBO for the torus vertices
torus_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
VertexAttribArray attr(torus_prog, "Position");
attr.Setup(n_per_vertex, DataType::Float);
attr.Enable();
}
// bind the VBO for the torus UV-coordinates
torus_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(torus_prog, "TexCoord");
attr.Setup(n_per_vertex, DataType::Float);
attr.Enable();
}
const GLchar* plane_vs_source[3] = {
"#version 330\n",
plane_count_def.str().c_str(),
"uniform mat4 ProjectionMatrix, CameraMatrix;"
"uniform float ClipSign[PlaneCount];"
"uniform vec4 ClipPlane[PlaneCount];"
"uniform vec3 Normal;"
"in vec4 Position;"
"out vec3 vertColor;"
"void main(void)"
"{"
" gl_Position = Position;"
" for(int p=0; p!=PlaneCount; ++p)"
" {"
" gl_ClipDistance[p] = "
" ClipSign[p]* "
" dot(ClipPlane[p], gl_Position);"
" }"
" gl_Position = "
" ProjectionMatrix *"
" CameraMatrix *"
" gl_Position;"
" vertColor = normalize("
" abs(Normal) + "
" 0.4*Position.xyz"
" );"
"}"
};
plane_vs.Source(plane_vs_source, 3);
plane_vs.Compile();
plane_fs.Source(
"#version 330\n"
"in vec3 vertColor;"
"out vec4 fragColor;"
"void main(void)"
"{"
" fragColor = vec4(vertColor, 0.7);"
"}"
);
plane_fs.Compile();
plane_prog.AttachShader(plane_vs);
plane_prog.AttachShader(plane_fs);
plane_prog.Link();
plane_prog.Use();
ProgramUniform<Vec4f> torus_clip_plane(torus_prog, "ClipPlane");
ProgramUniform<Vec4f> plane_clip_plane(plane_prog, "ClipPlane");
ProgramUniform<GLfloat> torus_clip_sign(torus_prog, "ClipSign");
ProgramUniform<GLfloat> plane_clip_sign(plane_prog, "ClipSign");
for(std::size_t p=0; p!=plane.size(); ++p)
{
plane[p].Bind();
plane_positions[p].Bind(Buffer::Target::Array);
{
std::vector<GLfloat> data;
GLuint n = make_plane[p].Positions(data);
// upload the data
Buffer::Data(Buffer::Target::Array, data);
VertexAttribArray attr(plane_prog, "Position");
attr.Setup(n, DataType::Float);
attr.Enable();
}
{
auto eq = make_plane[p].Equation();
torus_clip_plane[p].Set(eq);
plane_clip_plane[p].Set(eq);
}
{
torus_clip_signs.push_back(torus_clip_sign[p]);
plane_clip_signs.push_back(plane_clip_sign[p]);
}
}
//
gl.ClearColor(0.8f, 0.8f, 0.7f, 0.0f);
gl.ClearDepth(1.0f);
gl.FrontFace(make_torus.FaceWinding());
gl.Enable(Capability::DepthTest);
gl.BlendFunc(BlendFn::SrcAlpha, BlendFn::OneMinusSrcAlpha);
}
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());
}
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());
}
TorusExample(void)
: make_torus(1.0, 0.5, 72, 48)
, torus_instr(make_torus.Instructions())
, torus_indices(make_torus.Indices())
{
// Set the vertex shader source
vs.Source(
"#version 330\n"
"uniform mat4 ProjectionMatrix, CameraMatrix;"
"in vec4 Position;"
"in vec3 Normal;"
"out vec3 vertNormal;"
"out vec3 vertViewDir;"
"void main(void)"
"{"
" 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 330\n"
"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(1.0, 0.1, 0.3, 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 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();
}
// 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, 0.0f));
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);
}