OpenGL2: Add support for OpenGL ES 2 #664
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This mainly targets OpenGL ES 2.0 but it also supports compiling GLSL as ESSL 3.00. It's missing support for framebuffer objects which should be possible on ES 2. (Though using renderbuffers instead of textures.) opengl1 cvars that are not supported will display a message and disable the cvar. This has not been reviewed for new opengl2 cvars. Enabling cvars may cause rendering issues. Some of the broken cvars may be possible to support using OpenGL ES 3 features. The game displays okay with the default cvars.
OpenGL ES 2 is only required to support unsigned short for indexes.
OpenGL ES has a minimum of 8 vertex attributes while desktop OpenGL has a minimum of 16. Vertex animation uses attributes 10 to 12.
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Thank you! Performance improvements can come later on, much better to get a start. You're the best. |
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This adds support for running the OpenGL2 renderer using the OpenGL ES 2 and 3 APIs.
It doesn't have framebuffer object support yet; used by many features such as auto-exposure/HDR, SSAO, and sun shadows.
I think this ran at 5 FPS on the Raspberry Pi 3B when I tested essentially these changes in 2019. Though I think the issue is how the OpenGL2 renderer operates rather than the ES API usage.
There is nothing actually broken about this OpenGL ES 2 port—just missing features and room for better performance—so it could be merged.