source/ambientocclusion.h

   1 #ifndef MSP_GL_AMBIENTOCCLUSION_H_
   2 #define MSP_GL_AMBIENTOCCLUSION_H_
   3
   4 #include "framebuffer.h"
   5 #include "mesh.h"
   6 #include "postprocessor.h"
   7 #include "program.h"
   8 #include "programdata.h"
   9 #include "rendertarget.h"
  10 #include "texture2d.h"
  11 #include "texturing.h"
  12
  13 namespace Msp {
  14 namespace GL {
  15
  16 /**
  17 Implements screen-space ambient occlusion.
  18
  19 http://en.wikipedia.org/wiki/Screen_Space_Ambient_Occlusion
  20 */
  21 class AmbientOcclusion: public PostProcessor
  22 {
  23 public:
  24         struct Template: PostProcessor::Template
  25         {
  26                 class Loader: public DataFile::DerivedObjectLoader<Template, PostProcessor::Template::Loader>
  27                 {
  28                 public:
  29                         Loader(Template &);
  30                 };
  31
  32                 unsigned n_samples;
  33                 float occlusion_radius;
  34                 float darkness;
  35                 float edge_depth_threshold;
  36
  37                 Template();
  38
  39                 virtual AmbientOcclusion *create(unsigned, unsigned) const;
  40         };
  41
  42 private:
  43         Texture2D rotate_lookup;
  44         RenderTarget occlude_target;
  45         Texturing texturing;
  46         Program occlude_shader;
  47         Program combine_shader;
  48         mutable ProgramData shdata;
  49         RefPtr<Mesh> quad;
  50         RefPtr<Sampler> linear_sampler;
  51         RefPtr<Sampler> nearest_sampler;
  52
  53 public:
  54         AmbientOcclusion(unsigned, unsigned, float = 1.0f);
  55
  56 private:
  57         static float random(unsigned &);
  58
  59 public:
  60         void set_n_samples(unsigned);
  61         void set_occlusion_radius(float);
  62         void set_edge_depth_threshold(float);
  63
  64         void set_darkness(float);
  65
  66         virtual void render(Renderer &, const Texture2D &, const Texture2D &);
  67 };
  68
  69 } // namespace GL
  70 } // namespace Msp
  71
  72 #endif