Remove unused FBO code and add groundwork for FBO blit functions #1813
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We don't use renderbuffers. The renderbuffer size limit does not apply to an FBO.
Replace GL_FRAMEBUFFER with GL_DRAW_FRAMEBUFFER everywhere. Binding GL_FRAMEBUFFER to x is defined as binding GL_DRAW_FRAMEBUFFER to x then binding GL_READ_FRAMEBUFFER to x. Currently we only use the DRAW aspect. The double binding can be a nuisance when adding functionality (blit) that needs the read aspect.
Co-Authored-By: VReaperV <[email protected]>
Strangely, we didn't use any functions from EXT_framebuffer_blit before this, despite it being a required extension (if ARB_framebuffer_blit is unavailable) and a comment saying "our code is known to require EXT_framebuffer_blit".
Provide the alternative function to use if GL_ARB_framebuffer_object is not available but GL_EXT_framebuffer_object is. The missing shim could result in a crash if the former extension is not available and dynamic lights are enabled.
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The last 2 things are needed for FBO blitting. I need FBO blitting to fix #1783, while it is also used in #1480 so I'm trying to reuse the code from there. But I've tried to make R_BindFBO more robust by making GL_DRAW_FRAMEBUFFER the default instead of GL_FRAMEBUFFER because with the latter, you get issues that it matters what order you do the bindings in because it overwrites both READ and DRAW framebuffers.