source/effects/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
  12 namespace Msp {
  13 namespace GL {
  14
  15 /**
  16 Implements screen-space ambient occlusion.
  17
  18 http://en.wikipedia.org/wiki/Screen_Space_Ambient_Occlusion
  19 */
  20 class AmbientOcclusion: public PostProcessor
  21 {
  22 public:
  23         struct Template: PostProcessor::Template
  24         {
  25                 class Loader: public DataFile::DerivedObjectLoader<Template, PostProcessor::Template::Loader>
  26                 {
  27                 public:
  28                         Loader(Template &);
  29                 };
  30
  31                 unsigned n_samples;
  32                 float occlusion_radius;
  33                 float darkness;
  34                 float edge_depth_threshold;
  35
  36                 Template();
  37
  38                 virtual AmbientOcclusion *create(unsigned, unsigned) const;
  39         };
  40
  41 private:
  42         const Texture2D &rotate_lookup;
  43         RenderTarget occlude_target;
  44         const Program &occlude_shader;
  45         const Program &combine_shader;
  46         mutable ProgramData shdata;
  47         const Mesh &quad;
  48         const Sampler &linear_sampler;
  49         const Sampler &nearest_clamp_sampler;
  50         const Sampler &nearest_sampler;
  51
  52 public:
  53         AmbientOcclusion(unsigned, unsigned, float = 1.0f);
  54
  55 private:
  56         static const Texture2D &get_or_create_rotate_lookup();
  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