Add a film grain postprocessor

[libs/demoscene.git] / source / filmgrain.h

diff --git a/source/filmgrain.h b/source/filmgrain.h
new file mode 100644 (file)
index 0000000..810b9a4
--- /dev/null
+++ b/source/filmgrain.h
@@ -0,0 +1,63 @@
+#ifndef MSP_DEMOSCENE_FILMGRAIN_H_
+#define MSP_DEMOSCENE_FILMGRAIN_H_
+
+#include <msp/gl/mesh.h>
+#include <msp/gl/postprocessor.h>
+#include <msp/gl/program.h>
+#include <msp/gl/programdata.h>
+#include <msp/gl/texture2darray.h>
+#include <msp/gl/texturing.h>
+
+namespace Msp {
+namespace DemoScene {
+
+class FilmGrain: public GL::PostProcessor
+{
+public:
+       struct Template: public PostProcessor::Template
+       {
+               class Loader: public DataFile::DerivedObjectLoader<Template, PostProcessor::Template::Loader>
+               {
+               public:
+                       Loader(Template &t);
+               };
+
+               unsigned size;
+               unsigned layers;
+               float coarseness;
+               float strength;
+
+               Template();
+
+               virtual FilmGrain *create(unsigned, unsigned) const;
+       };
+
+private:
+       const Msp::GL::Mesh &mesh;
+       const Msp::GL::Program &shprog;
+       Msp::GL::ProgramData shdata;
+       Msp::GL::Texturing texturing;
+       unsigned size;
+       unsigned layers;
+       Msp::GL::Texture2DArray grain;
+       unsigned current_layer;
+
+public:
+       FilmGrain(unsigned = 256, unsigned = 16);
+
+private:
+       void generate_grain();
+       void bicubic2x(const UInt8 *, UInt8 *, Int16 *);
+       static UInt8 clamp(int);
+
+public:
+       void set_coarseness(float);
+       void set_strength(float);
+
+       virtual void render(GL::Renderer &, const GL::Texture2D &, const GL::Texture2D &);
+};
+
+} // namespace DemoScene
+} // namespace Msp
+
+#endif