functions for copying data to buffers directly on the GPU #13
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For #11 I got inspired to just go ahead and implement what I was imagining.
This PR adds some utility functions for copying framebuffer data to a single buffer (
readPixelsToWebGLBuffer) and also to multiple buffers (readPixelsToMultipleWebGLBuffers). Additionally, there's a simpleGPULayer.copyToWebGLBufferthat usesreadPixelsToWebGLBuffer.This is WebGL2-only functionality. I'd like to support mobile devices in my application but I was running out of framebuffer attachments, so my plan is to concatenate a bunch of data into a single
GPULayerand use thereadPixelsToMultipleWebGLBuffersto read them out to various buffers that I can use as vertex/instance attribute buffers. This will also cut back on texture sampling.Performance is still a ❔ but hopefully it'll be better!