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(n_per_vertex, DataType::Float);
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(n_per_vertex, DataType::Float);
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 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);
}
// 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);
}
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);
}