use main buffer and copy data to fbo texture (opengl) #5294
+36
−14
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DO NOT MERGE.
continuation of #5037
resolves #4729
renders all shaders to the default buffer and then copies it to the designated custom shader texture.
this is the messy mvp of a new shader "pipeline" which doesnt fit in with how the system was designed to work (which is only rendering to the fbo) which is why this is a draft pr.