mirror/rpcs3
1
0
Fork 0
mirror of https://github.com/RPCS3/rpcs3.git synced 2025-02-06 00:40:11 +00:00
Code Issues Packages Projects Releases Wiki Activity

rsx: Remove the alpha-to-coverage hack that was added to hide the missing mipmaps in games

Browse Source 
- Moves to a purely stochastic function using dithering to simlulate coverage
This commit is contained in:
kd-11 2019-10-10 22:09:35 +03:00 committed by kd-11
parent f0ed0285f3
commit 0c35595ce2
1 changed files with 4 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
rpcs3/Emu/RSX/Common/GLSLCommon.h
View File

@ -555,22 +555,14 @@ namespace glsl
if (props.emulate_coverage_tests)
{
// NOTES:
// Lowers alpha accuracy down to 2 bits, to mimic A2C banding
// Alpha lower than the real threshold (e.g 0.25 for 4 samples) gets a randomized chance to make it to the lowest transparency state
// Helps to avoid A2C tested foliage disappearing in the distance
// TODO: Fix dithering when mipmap gather is finished to remove muddy appearance. Alpha boost is only present to hide far LOD issues in titles like RDR
// Purely stochastic
OS <<
"bool coverage_test_passes(/*inout*/const in vec4 _sample, const in uint control)\n"
"bool coverage_test_passes(const in vec4 _sample, const in uint control)\n"
"{\n"
" if ((control & 0x1) == 0) return false;\n"
"\n"
" float samples = float(control & 0x6) * 0.5f + 1.f;\n"
" float hash = _saturate(_rand(gl_FragCoord) + 0.5f) * 0.9f;\n"
" float epsilon = hash / samples;\n"
" float alpha = trunc((_sample.a + epsilon) * samples) / samples;\n"
" //_sample.a = min(_sample.a, alpha);\n" // Cannot blend A2C samples naively as they are order independent! Causes background bleeding
" return (alpha > 0.f);\n"
" float random = _rand(gl_FragCoord);\n"
" return (_sample.a > random);\n"
"}\n\n";
}