WebGL Read pixels from floating point render target

Question

There is some confusion e.g. in terms of support levels for rendering to floating point textures in WebGL. The OES_texture_float extension does not seem to mandate

Answer 1

The readPixels is limited to the RGBA format and the UNSIGNED_BYTE type (WebGL specification). However there are some methods for "packing" floats into RGBA/UNSIGNED_BYTE described here:

http://concord-consortium.github.io/lab/experiments/webgl-gpgpu/webgl.html