Fix alpha blending in WebGL backends #650
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This reverts commit 91bdf9b
emilk
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Aug 25, 2021
Co-authored-by: Emil Ernerfeldt <emil.ernerfeldt@gmail.com>
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mankinskin
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Sep 29, 2021
Add a render-to-texture step with an sRGBA8 texture
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This fixes alpha blending in the WebGL backends by first blending everything in a linear framebuffer, before converting the result to sRGB in a second shader.
The results of the color test are now identical to the egui_glium backend when using the WebGL2 backend.
The WebGL1 backend suffers from reduced precision in dark colors without the
SRGB8_ALPHA8format and still doesn't have correct texture interpolation.Color test with the change (I have since removed the warning):
WebGL2
WebGL1
(Sorry for not following the contributing guidelines exactly ("First file an issue" and all that). This was a spontaneous test as I didn't know whether it was even possible and I didn't wan't to file an issue the same minute as closing it (Should I?).)