Use case

This is an extension to #136025.

Fragment shaders sometimes need lookup tables, for example for color transformations. These tables usually use floating point, since that's the natural way math works on GPUs. GLSL handles this transparently, and APIs like OpenGL have support for this via floating point textures (GL_RGBA32F, GL_R32F, etc).

Proposal

If Flutter adds support for sync texture construction, this should also allow supplying a floating point texture to enable these kinds of operations in fragment shaders.