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 Implements screen-space ambient occlusion.
  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;
  30                 float occlusion_radius;
  31                 float darkness;
  32                 float edge_depth_threshold;
  33
  34                 Template();
  35
  36                 virtual AmbientOcclusion *create(unsigned, unsigned) const;
  37         };
  38
  39 private:
  40         const Texture2D &rotate_lookup;
  41         RenderTarget occlude_target;
  42         const Program &occlude_shader;
  43         const Program &combine_shader;
  44         mutable ProgramData shdata;
  45         const Mesh &quad;
  46         const Sampler &linear_sampler;
  47         const Sampler &nearest_clamp_sampler;
  48         const Sampler &nearest_sampler;
  49
  50 public:
  51         AmbientOcclusion(unsigned, unsigned, float = 1.0f);
  52
  53 private:
  54         static const Texture2D &get_or_create_rotate_lookup();
  55         static float radical_inverse(unsigned);
  56
  57 public:
  58         void set_n_samples(unsigned);
  59         void set_occlusion_radius(float);
  60         void set_edge_depth_threshold(float);
  61
  62         void set_darkness(float);
  63
  64         virtual void render(Renderer &, const Texture2D &, const Texture2D &);
  65
  66         virtual void set_debug_name(const std::string &);
  67 };
  68
  69 } // namespace GL
  70 } // namespace Msp
  71
  72 #endif