Store multisampling in FBO about raylib

[raysan5]

Hello @victorfisac ,

SetConfigFlags(FLAG_MSAA_4X_HINT) tryes to setup multisampling on main framebuffer, it depends on OpenGL version (> 3.0) and hardware support (ARB_multisample extension). Setting multisampling on FBO requires manual setup; the default FBO used for post-processing effects has no multisampling enabled, it will consume too much resources, specially for embeded and low-end devices.

If you desire to implement an antialiasing algorythm to your post-produced image, my recomendation is using FXAA antialiasing. It can be directly implemented on the fragment shader and it's very fast. You can find more information here:

http://www.kotaku.com.au/2011/12/what-is-fxaa/
http://www.geeks3d.com/20110405/fxaa-fast-approximate-anti-aliasing-demo-glsl-opengl-test-radeon-geforce/

[victorfisac]

Found a working FXAA fragment shader! Here is an adapted to raylib version: http://pastebin.com/ZE6w1LKi

Changed to version 330 and var names to fragTexCoord and fragColor. The shader just needs the screen resolution to work.

Source: https://www.opengl.org/discussion_boards/showthread.php/184192-GLSL-FXAA-rendering-off-screen

I think maybe it can be optimized a little bit... not sure. Tested with shaders_custom_uniform.c and dwarf model, nice result! :D I could test FPS drop, I disable SetTargetFPS() and it is still limited to 60 (also disabled Vsync in nvidia panel)...

[raysan5]

Thanks @victorfisac!

FXAA fragment shader and an example will be added to raylib shaders collection on next version!