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04b55c866a
Review of the alpha to coverage change for alpha tested surfaces: - An alpha which is flat over the pixel (fwidth 0) and equal to the opacity threshold got a coverage of 0.5, so e.g. opacity 1 on an opaque or DXT1 texture turned half see-through with multisampling. Without an alpha edge in the pixel the plain test decides now: step(opacity, alpha). - The shaders took the coverage path whenever they were built with multisampling, also where alpha to coverage is off (the reflections pass) or does nothing (the single-sampled model previews), and grew the cut-outs there by about half a pixel. model_ubo gets an alpha_to_coverage flag, set together with the GL state, and the shaders keep the plain alpha test without it. The previews no longer turn alpha to coverage on. The flag takes 4 of the 12 padding bytes after shadow_tone, so the std140 layout and the size of the block stay the same. - The shader validator never set iMultisampling, so it never compiled the alpha to coverage branches. Its "features on" configuration uses the default of 2 now, on desktop GL and GLES.