void ResizeLightMask(GLuint width, GLuint height)
{
Texture::Active(light_tex_unit);
Texture::Target tex_tgt = Texture::Target::Rectangle;
light_mask.Bind(tex_tgt);
Texture::Image2D(
tex_tgt,
0,
PixelDataInternalFormat::Red,
width, height,
0,
PixelDataFormat::Red,
PixelDataType::UnsignedByte,
nullptr
);
Renderbuffer::Target rbo_tgt = Renderbuffer::Target::Renderbuffer;
light_rbo.Bind(rbo_tgt);
Renderbuffer::Storage(
rbo_tgt,
PixelDataInternalFormat::DepthComponent,
width,
height
);
}
void SetupLightMask(void)
{
Texture::Active(light_tex_unit);
Texture::Target tex_tgt = Texture::Target::Rectangle;
light_mask.Bind(tex_tgt);
draw_prog.Use();
UniformSampler(draw_prog, "LightMap").Set(GLuint(light_tex_unit));
Texture::MinFilter(tex_tgt, TextureMinFilter::Linear);
Texture::MagFilter(tex_tgt, TextureMagFilter::Linear);
Texture::WrapS(tex_tgt, TextureWrap::ClampToEdge);
Texture::WrapT(tex_tgt, TextureWrap::ClampToEdge);
Framebuffer::Target fbo_tgt = Framebuffer::Target::Draw;
light_fbo.Bind(fbo_tgt);
Framebuffer::AttachTexture(fbo_tgt, FramebufferAttachment::Color, light_mask, 0);
Renderbuffer::Target rbo_tgt = Renderbuffer::Target::Renderbuffer;
light_rbo.Bind(rbo_tgt);
Framebuffer::AttachRenderbuffer(fbo_tgt, FramebufferAttachment::Depth, light_rbo);
}
void RenderShadowMap(GLuint size)
{
// matrices
auto lt_proj= CamMatrixf::PerspectiveX(Degrees(12), 1.0, 85.0, 110.0);
auto light = CamMatrixf::LookingAt(light_position, Vec3f());
// setup the texture
Texture::Active(shadow_tex_unit);
mask_prog.Use();
Uniform<Mat4f>(mask_prog, "LightMatrix").Set(lt_proj*light);
UniformSampler(mask_prog, "ShadowMap").Set(GLuint(shadow_tex_unit));
draw_prog.Use();
Uniform<Mat4f>(draw_prog, "LightMatrix").Set(lt_proj*light);
UniformSampler(draw_prog, "ShadowMap").Set(GLuint(shadow_tex_unit));
Texture::Target tex_tgt = Texture::Target::_2D;
shadow_map.Bind(tex_tgt);
Texture::MinFilter(tex_tgt, TextureMinFilter::Linear);
Texture::MagFilter(tex_tgt, TextureMagFilter::Linear);
Texture::WrapS(tex_tgt, TextureWrap::ClampToEdge);
Texture::WrapT(tex_tgt, TextureWrap::ClampToEdge);
Texture::CompareMode(tex_tgt, TextureCompareMode::CompareRefToTexture);
Texture::Image2D(
tex_tgt,
0,
PixelDataInternalFormat::DepthComponent32,
size, size,
0,
PixelDataFormat::DepthComponent,
PixelDataType::Float,
nullptr
);
// create shadow program
ShadowProgram shadow_prog(vert_shader);
// VAO for the meshes in shadow program
VertexArray vao = meshes.VAOForProgram(shadow_prog);
vao.Bind();
// FBO for offscreen rendering of the shadow map
Framebuffer::Target fbo_tgt = Framebuffer::Target::Draw;
Framebuffer fbo;
fbo.Bind(fbo_tgt);
Framebuffer::AttachTexture(fbo_tgt, FramebufferAttachment::Depth, shadow_map, 0);
// RBO for offscreen rendering
Renderbuffer::Target rbo_tgt = Renderbuffer::Target::Renderbuffer;
Renderbuffer rbo;
rbo.Bind(rbo_tgt);
Renderbuffer::Storage(rbo_tgt, PixelDataInternalFormat::RGBA, size, size);
Framebuffer::AttachRenderbuffer(fbo_tgt, FramebufferAttachment::Color, rbo);
// setup the matrices
shadow_prog.projection_matrix.Set(lt_proj);
shadow_prog.camera_matrix.Set(light);
// setup and clear the viewport
gl.Viewport(size, size);
gl.Clear().DepthBuffer();
// draw the meshes
gl.PolygonOffset(1.0, 1.0);
gl.Enable(Capability::PolygonOffsetFill);
meshes.Draw();
gl.Disable(Capability::PolygonOffsetFill);
gl.Finish();
// bind the default framebuffer
DefaultFramebuffer().Bind(Framebuffer::Target::Draw);
}