I’ve been searching around looking for a glow shader tutorial they all seem to be in HLSL or lack examples , if one of you is able to give me a link to a good tutorial or even just give a simple run through of what I would need to do to obtain a glow effect.
blur the areas you want to glow (perhaps by color or a mask) then potentially adjust contrast or muck about and blend (additive or otherwise) back into the original image. Must use FBO passes.
There is also the trick with code in the Nvidia Gameworks OpenGL demos which will make luminant colors glow.
https://github.com/NVIDIAGameWorks/OpenGLSamples/tree/master/samples/es2-aurora/Bloom
Lots of other neat techniques in the Gameworks OpenGL samples. Eventually in my “copious spare time” I’m going to port over the Gameworks OpenGL samples to the Java / Android OpenGL demos repo I’ll be maintaining.
Can you not convert simple HLSL to GLSL? They’re fairly similar…
Solved it , I was confused about the interpolation of values after finding that out and researching FBOS I am managing to write it now.