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rsx: Add a comment explaining the barycentric interpolation change

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kd-11 2023-05-02 19:05:52 +03:00 committed by kd-11
parent 08e7a23121
commit 579a6c9311
1 changed files with 2 additions and 0 deletions
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rpcs3/Emu/RSX/Program/GLSLCommon.cpp
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@ -1250,6 +1250,8 @@ namespace glsl
"\n" "\n"
"vec4 _interpolate_varying3(const in vec4[3] v)\n" "vec4 _interpolate_varying3(const in vec4[3] v)\n"
"{\n" "{\n"
// In the corner case where v[0] == v[1] == v[2], this algorithm generates a perfect result vs alternatives that use weighted multiply + add.
// Due to the finite precision of floating point arithmetic, adding together the result of different multiplies yeields a slightly inaccurate result which breaks things.
" const vec4 p10 = v[1] - v[0];\n" " const vec4 p10 = v[1] - v[0];\n"
" const vec4 p20 = v[2] - v[0];\n" " const vec4 p20 = v[2] - v[0];\n"
" return v[0] + p10 * $gl_BaryCoord.y + p20 * $gl_BaryCoord.z;\n" " return v[0] + p10 * $gl_BaryCoord.y + p20 * $gl_BaryCoord.z;\n"