// Returns a vector of cube offsets
static std::vector<Mat4f> MakeCubeMatrices(GLuint count, float max_dist)
{
std::srand(59039);
std::vector<Mat4f> offsets(count);
for(GLuint i=0; i!=count; ++i)
{
float x = float(std::rand())/RAND_MAX;
float y = float(std::rand())/RAND_MAX;
float z = float(std::rand())/RAND_MAX;
float sx = std::rand()%2 ? 1.0f: -1.0f;
float sy = std::rand()%2 ? 1.0f: -1.0f;
float sz = std::rand()%2 ? 1.0f: -1.0f;
offsets[i] =
ModelMatrixf::Translation(
sx*(1.0f + std::pow(x, 0.9f) * max_dist),
sy*(1.0f + std::pow(y, 1.5f) * max_dist),
sz*(1.0f + std::pow(z, 0.7f) * max_dist)
) *
ModelMatrixf::RotationZ(
RightAngles(float(std::rand())/RAND_MAX)
) *
ModelMatrixf::RotationY(
RightAngles(float(std::rand())/RAND_MAX)
) *
ModelMatrixf::RotationX(
RightAngles(float(std::rand())/RAND_MAX)
);
}
return offsets;
}
void Render(ExampleClock& clock) {
if(long(clock.Now().Seconds()) % 4 == 0) {
status += clock.Interval().Seconds();
} else if(status != double(long(status))) {
if(status - double(long(status)) < 0.5)
status = double(long(status));
else
status = 1.0 + double(long(status));
}
gl.Clear().ColorBuffer().DepthBuffer();
point_prog.status = GLfloat(0.5 - 0.5 * CosineWave(status * 0.5));
CamMatrixf camera = CamMatrixf::Orbiting(
Vec3f(),
5.5f,
FullCircles(clock.Now().Seconds() / 19.0),
Degrees(45 + SineWave(clock.Now().Seconds() / 15.0) * 40));
point_prog.camera_matrix.Set(camera);
point_prog.model_matrix.Set(
ModelMatrixf::RotationX(RightAngles(status)));
shape.Draw();
}
void make_shape_1(const Program& prog, int vbo, const GLchar* name) {
vbos[vbo].Bind(Buffer::Target::Array);
std::vector<GLfloat> data(point_count * 3);
auto i = data.begin(), e = data.end();
while(i != e) {
auto phi = FullCircles((std::rand() % 1001) * 0.001);
auto rho = RightAngles((std::rand() % 1001) * 0.002 - 1.0);
*i++ = Cos(phi) * Cos(rho);
*i++ = Sin(rho);
*i++ = Sin(phi) * Cos(rho);
}
Buffer::Data(Buffer::Target::Array, data);
VertexArrayAttrib attr(prog, name);
attr.Setup<Vec3f>();
attr.Enable();
}
void _make_spheres(Vec3f center, GLfloat radius)
{
_adjust_sphere(center, radius);
if(radius < _min_radius) return;
if(!_apply_sphere(center, radius)) return;
GLfloat sub_radius = radius * _sub_scale;
GLsizei i = 0, n = (8.0f*radius*radius)/(sub_radius*sub_radius);
while(i != n)
{
auto rad = radius*(1.0f + _rand_s()*_sub_variance*0.5f);
auto rho = FullCircles(_rand_u());
auto phi = RightAngles(_rand_s());
_make_spheres(
center + Vec3f(
rad*Cos(phi)*Cos(rho),
rad*Sin(phi),
rad*Cos(phi)*Sin(rho)
),
sub_radius*(1.0f + _rand_s()*_sub_variance)
);
++i;
}
}
void Render(double time)
{
gl.Clear().ColorBuffer().StencilBuffer();
int border = 20;
std::stringstream text;
// shape colors
GLfloat shape_color_gen_coeffs[9] = {
0.0f, 0.0f, 0.2f,
0.2f, 0.0f, 0.2f,
0.0f, 0.0f, 0.2f
};
npr.ColorGen(
PathNVColor::Primary,
PathNVGenMode::ObjectBoundingBox,
PathNVColorFormat::RGB,
shape_color_gen_coeffs
);
// Shape
dsa.ModelviewMatrix()
.LoadIdentity()
.Translate(64, 64, 0)
.Translate(192, 192, 0)
.Rotate(RightAngles(time), Vec3f::Unit(2))
.Translate(-192, -192, 0);
shape.StencilFill(PathNVFillMode::CountUp, 0xFF);
shape.CoverFill(PathNVFillCoverMode::BoundingBox);
// text colors
GLfloat text_color_gen_coeffs[9] = {
-0.3f, 0.0f, 0.3f,
0.0f, 0.2f, 0.6f,
0.3f, 0.0f, 0.0f
};
npr.ColorGen(
PathNVColor::Primary,
PathNVGenMode::ObjectBoundingBox,
PathNVColorFormat::RGB,
text_color_gen_coeffs
);
// Time
dsa.ModelviewMatrix()
.LoadIdentity()
.Translate(border, border, 0);
text << "Time: "
<< std::setw(7)
<< std::setprecision(2)
<< std::fixed
<< time << "[s]";
RenderText(text.str());
text.str(std::string());
// Frame no
dsa.ModelviewMatrix()
.LoadIdentity()
.Translate(tex_side-border, border, 0)
.Rotate(RightAngle(), Vec3f::Unit(2));
text << "Frame: "
<< std::setw(7)
<< std::fixed
<< frame_no;
RenderText(text.str());
text.str(std::string());
// FPS
dsa.ModelviewMatrix()
.LoadIdentity()
.Translate(tex_side-border, tex_side-border, 0)
.Rotate(RightAngles(2), Vec3f::Unit(2));
text << "FPS: ";
if(time < 1) text << "<N/A>";
else text << std::setw(7) << std::fixed << frame_no / time;
RenderText(text.str());
text.str(std::string());
// title
dsa.ModelviewMatrix()
.LoadIdentity()
.Translate(border, tex_side-border, 0)
.Rotate(RightAngles(3), Vec3f::Unit(2));
RenderText("OpenGL");
// sync
thread_ready.Signal();
parent_ready.Wait();
++frame_no;
}
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);
}