source/effects/ambientocclusion.h

   1 #ifndef MSP_GL_AMBIENTOCCLUSION_H_
   2 #define MSP_GL_AMBIENTOCCLUSION_H_
   3
   4 #include "postprocessor.h"
   5 #include "programdata.h"
   6 #include "rendertarget.h"
   7
   8 namespace Msp {
   9 namespace GL {
  10
  11 class Program;
  12
  13 /**
  14 Darkens recessed areas of the scene to simulate the occlusion of ambient light.
  15
  16 http://en.wikipedia.org/wiki/Screen_Space_Ambient_Occlusion
  17 */
  18 class AmbientOcclusion: public PostProcessor
  19 {
  20 public:
  21         struct Template: PostProcessor::Template
  22         {
  23                 class Loader: public DataFile::DerivedObjectLoader<Template, PostProcessor::Template::Loader>
  24                 {
  25                 public:
  26                         Loader(Template &);
  27                 };
  28
  29                 unsigned n_samples = 16;
  30                 float occlusion_radius = 0.5f;
  31                 float darkness = 1.0f;
  32                 float edge_depth_threshold = 0.1f;
  33
  34                 virtual AmbientOcclusion *create(unsigned, unsigned) const;
  35         };
  36
  37 private:
  38         const Texture2D &rotate_lookup;
  39         RenderTarget occlude_target;
  40         const Program &occlude_shader;
  41         const Program &combine_shader;
  42         mutable ProgramData shdata;
  43         const Mesh &quad;
  44         const Sampler &linear_sampler;
  45         const Sampler &nearest_clamp_sampler;
  46         const Sampler &nearest_sampler;
  47
  48 public:
  49         AmbientOcclusion(unsigned, unsigned);
  50
  51 private:
  52         static const Texture2D &get_or_create_rotate_lookup();
  53         static float radical_inverse(unsigned);
  54
  55 public:
  56         void set_n_samples(unsigned);
  57         void set_occlusion_radius(float);
  58         void set_edge_depth_threshold(float);
  59
  60         void set_darkness(float);
  61
  62         virtual void render(Renderer &, const Texture2D &, const Texture2D &);
  63
  64         virtual void set_debug_name(const std::string &);
  65 };
  66
  67 } // namespace GL
  68 } // namespace Msp
  69
  70 #endif