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Wanna implement

1. lighting.
   • Layered Car Paint Shader
   • Area light https://eheitzresearch.wordpress.com/415-2/
2. Light Scattering (GPU Pro 5) http://www.scratchapixel.com/lessons/procedural-generation-virtual-worlds/simulating-sky
3. Reflection
   • Screen space reflection
   • http://roar11.com/2015/07/screen-space-glossy-reflections/
4. SSAO
   • Horizon-Base Ambient Occlusion +
   • triangle sample kernel in textur space. orient it in the same hemisphere with a texel's normal.
   • https://software.intel.com/en-us/articles/adaptive-screen-space-ambient-occlusion
5. AA
   • FXAA, MSAA, MLAA, SMAA
6. SDF https://kosmonautblog.wordpress.com/2017/05/09/signed-distance-field-rendering-journey-pt-2/

TODO

1. main loop. pump_sys_messages is an update routine as well. move into the update loop.
2. profile: memory, perf (VS profiler, anything else)
3. try to move Win_app::run implemtation into Application. You will need _mouse, _window, _rnd_ctx, pump_sys_messages
4. Tangent space debugging. Draw tangent space for each vertex. Also draw the final normal exctracted from normal-map
5. os messages(events)
   • mouse wheel
   • keyboard
   • fullscreen (F11), max/min window https://github.com/powervr-graphics/Native_SDK/blob/4.1/Framework/PVRShell/OS/Windows/ShellOS.cpp
6. math
   • Plane <n, d>
   • Rect_3d
   • Frustum owns planes. view_space_{near/far/left/right}plane(), view_space{near/far/left/right}_rect_3d()
   • float{2/3/4} to float[2/3/4] array
7. Deferred_lighting_renderer viewpoint rotation is broken if viewpoint's target is not float3::zero. Possible fix. Oy rotation axis must take target's position into account.
8. set_uniform overload funcs instead of function template specs. (set_uniform_array too if it's possible)
9. deferred_lighting_renderer specular term is visible at the opposite side of the teapot
10. Models
    • crytek sponza
    • light house
11. init.cmd
    • See Assimp & MS switches link.