TODO.txt

TODO:

- Z-prepass
- deep deferred shading
- deep shadow mapping (is the name correct?) -> use the alpha value in the light G-buffer
  for translucent shadow casters
- several bounces + Russian Roulette Sampling
- for the fake texture reduce operation: support many rays
	- PhotonVolumesRenderer
- real texture reduce operation
- resolve the problems with energy
- transparency is not correct. When removing
		if(texel_pixels_done.r == 1.0)
			discard;
		-> BUG
	+ blending function is wrong anyway...it seems impossible to have
	a correct blending without doing all lighting calculations this way
- transparent objects' shadow casting is wrong
- resolve the Z-fighting with back layers when doing shadow mapping in MultiLayerRenderer
- material_reflectance -> ??
- transmission map? transmission coefficient?
- Use stencil routing in the MultiLayerRenderer
- Sampler objects?
- can we use a shadow sampler for the depth comparisons when tracing the rays?
  -> probably not, as there is the z_error calculation
- bilateral filtering

- don't store position in G-buffer
  => from Z-buffer and window coords (x,y) in [-1,1]²: multiply by inv(proj) => screen space
- light angle attenuation
- light distance attenuation
- packing of normalized vectors: 2 vectors can be stored in 1 RGBA8 texture
- texture manager
- fix normal mapping (tangent vectors, etc)
- use AssImp and add new scenes (Sponza...)

X some class to handle additional texture bindings
  => own them
  => bind them

X shadow mapping
	X "visibility map" for the deferred shading ->
	   texture(visibility_map, naninani)[0] -> is the pixel visible for the first light?
	   (IDEA: we could use a stencil buffer and bit operations with the number of the current light)
	X restrict lighting to the angle of the light using a dot product?
	X debug drawing of lights using quads
	X debug drawing of frustums for lights
	X debug drawing of shadow maps
	X debug DeferredShadingRenderer with shadow mapping
	X add debug drawing of lights in DeferredShadingRenderer
	X see http://www.opengl.org/wiki/GL_EXT_framebuffer_object : glDrawBuffer(GL_NONE) for rendering the shadow map (take care, they do not put a color attachment while it's compulsory...)
	ABANDONNED is using a depth buffer in color attachment 0 possible? -> NO