Move particle vertex processing to the GPU #2086
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The item pickup animation is not working for some reason.
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Optimize code; fix translucent particles
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Currently, all particle vertices are processed and rotated on the CPU, before uploading them to a shader to be rendered. Sodium optimizes this slightly with more direct and explicit math operations for more optimization opportunities. However, a lot of vector math is still being done on the CPU.
This PR moves that processing (for most particles) to the GPU in a new shader. Specifically, this PR optimizes billboard particles that haven't overridden the buildGeometry method, which means they face the camera. This is the vast majority of particles, with only a few overrides in vanilla Minecraft (shrieker, elder guardian, etc). The normal particle rendering is still in place for the particles that are built some other way.