Implement water simulation and surface shader for forest pond

[libs/gl.git] / demos / forestpond / source / water.h

diff --git a/demos/forestpond/source/water.h b/demos/forestpond/source/water.h
new file mode 100644 (file)
index 0000000..88bf935
--- /dev/null
+++ b/demos/forestpond/source/water.h
@@ -0,0 +1,61 @@
+#ifndef WATER_H_
+#define WATER_H_
+
+#include <random>
+#include <msp/gl/objectinstance.h>
+#include <msp/gl/texture2d.h>
+
+class Water: public Msp::GL::ObjectInstance
+{
+public:
+       struct Region
+       {
+               const Msp::GL::Mesh &terrain;
+               float left;
+               float bottom;
+               float right;
+               float top;
+       };
+
+private:
+       struct State
+       {
+               Msp::GL::Texture2D surface;
+               Msp::GL::Texture2D velocity;
+               Msp::GL::Texture2D clamping;
+       };
+
+       unsigned width;
+       unsigned height;
+       State state[2];
+       State *current;
+       State *next;
+       float time = 0.0f;
+       float stepsize = 0.001f;
+       std::minstd_rand rng;
+       Msp::GL::Texture2D bottom;
+       Msp::GL::Texture2D normals;
+       Msp::GL::Texture2D variance_x;
+       Msp::GL::Texture2D variance_y;
+       const Msp::GL::Sampler &sampler;
+       const Msp::GL::Program &sim_integrate;
+       const Msp::GL::Program &sim_velocity;
+       const Msp::GL::Program &sim_clamp;
+       const Msp::GL::Program &normals_shader;
+       const Msp::GL::Program &variance_x_shader;
+       const Msp::GL::Program &variance_y_shader;
+       Msp::GL::ProgramData sim_shdata;
+       Msp::GL::ProgramData shdata;
+       bool simulated = false;
+
+public:
+       Water(const Msp::GL::Object &, Msp::DataFile::Collection &, const Region &);
+
+public:
+       void setup_frame(Msp::GL::Renderer &) override;
+       void finish_frame() override;
+
+       void setup_render(Msp::GL::Renderer &, Msp::GL::Tag) const override;
+};
+
+#endif