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Merge pull request #1590 from unknownbrackets/gpu-rounding

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Do alpha test equal compares using rounding
This commit is contained in:
Henrik Rydgård 2013-04-29 01:21:10 -07:00
commit 232b354b13
1 changed files with 9 additions and 2 deletions
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11
GPU/GLES/FragmentShaderGenerator.cpp
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@ -156,6 +156,8 @@ void GenerateFragmentShader(char *buffer) {
WRITE(p, "varying vec2 v_texcoord;\n");
}
WRITE(p, "float round255f(in float x) { return floor(x * 255.0 + 0.5); }\n");
WRITE(p, "void main() {\n");
if (gstate.isModeClear()) {
@ -223,8 +225,13 @@ void GenerateFragmentShader(char *buffer) {
if (enableAlphaTest) {
int alphaTestFunc = gstate.alphatest & 7;
const char *alphaTestFuncs[] = { "#", "#", " != ", " == ", " >= ", " > ", " <= ", " < " }; // never/always don't make sense
if (alphaTestFuncs[alphaTestFunc][0] != '#')
WRITE(p, " if (v.a %s u_alphacolorref.a) discard;\n", alphaTestFuncs[alphaTestFunc]);
if (alphaTestFuncs[alphaTestFunc][0] != '#') {
// If it's an equality check (!=, ==, <=, >=), rounding is more likely to be important.
if (alphaTestFuncs[alphaTestFunc][2] == '=')
WRITE(p, " if (round255f(v.a) %s round255f(u_alphacolorref.a)) discard;\n", alphaTestFuncs[alphaTestFunc]);
else
WRITE(p, " if (v.a %s u_alphacolorref.a) discard;\n", alphaTestFuncs[alphaTestFunc]);
}
}
if (enableColorTest) {