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#define FUNC_NEVER 512 // 0x0200
#define FUNC_LESS 513 // 0x0201
#define FUNC_EQUAL 514 // 0x0202
#define FUNC_LEQUAL 515 // 0x0203
#define FUNC_GREATER 516 // 0x0204
#define FUNC_NOTEQUAL 517 // 0x0205
#define FUNC_GEQUAL 518 // 0x0206
#define FUNC_ALWAYS 519 // 0x0207
#if @alphaFunc != FUNC_ALWAYS && @alphaFunc != FUNC_NEVER
uniform float alphaRef;
#endif
float mipmapLevel(vec2 scaleduv)
{
vec2 dUVdx = dFdx(scaleduv);
vec2 dUVdy = dFdy(scaleduv);
float maxDUVSquared = max(dot(dUVdx, dUVdx), dot(dUVdy, dUVdy));
return max(0.0, 0.5 * log2(maxDUVSquared));
}
float coveragePreservingAlphaScale(sampler2D diffuseMap, vec2 uv)
{
#if @adjustCoverage
vec2 textureSize;
#if @useGPUShader4
textureSize = textureSize2D(diffuseMap, 0);
#else
textureSize = vec2(256.0);
#endif
return 1.0 + mipmapLevel(uv * textureSize) * 0.25;
#else
return 1.0;
#endif
}
void alphaTest()
{
#if @alphaToCoverage
float coverageAlpha = (gl_FragData[0].a - clamp(alphaRef, 0.0001, 0.9999)) / max(fwidth(gl_FragData[0].a), 0.0001) + 0.5;
// Some functions don't make sense with A2C or are a pain to think about and no meshes use them anyway
// Use regular alpha testing in such cases until someone complains.
#if @alphaFunc == FUNC_NEVER
discard;
#elif @alphaFunc == FUNC_LESS
gl_FragData[0].a = 1.0 - coverageAlpha;
#elif @alphaFunc == FUNC_EQUAL
if (gl_FragData[0].a != alphaRef)
discard;
#elif @alphaFunc == FUNC_LEQUAL
gl_FragData[0].a = 1.0 - coverageAlpha;
#elif @alphaFunc == FUNC_GREATER
gl_FragData[0].a = coverageAlpha;
#elif @alphaFunc == FUNC_NOTEQUAL
if (gl_FragData[0].a == alphaRef)
discard;
#elif @alphaFunc == FUNC_GEQUAL
gl_FragData[0].a = coverageAlpha;
#endif
#else
#if @alphaFunc == FUNC_NEVER
discard;
#elif @alphaFunc == FUNC_LESS
if (gl_FragData[0].a >= alphaRef)
discard;
#elif @alphaFunc == FUNC_EQUAL
if (gl_FragData[0].a != alphaRef)
discard;
#elif @alphaFunc == FUNC_LEQUAL
if (gl_FragData[0].a > alphaRef)
discard;
#elif @alphaFunc == FUNC_GREATER
if (gl_FragData[0].a <= alphaRef)
discard;
#elif @alphaFunc == FUNC_NOTEQUAL
if (gl_FragData[0].a == alphaRef)
discard;
#elif @alphaFunc == FUNC_GEQUAL
if (gl_FragData[0].a < alphaRef)
discard;
#endif
#endif
}
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