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Optimize coverage computation algorithm

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s2s 2021-02-11 22:10:05 +01:00 committed by Sergey Lipskiy
parent e6c3797726
commit 090b38e2d3
1 changed files with 10 additions and 11 deletions
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21
src/Graphics/OpenGLContext/GLSL/glsl_CombinerProgramBuilder.cpp
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@ -2637,18 +2637,17 @@ class ShaderCoverage : public ShaderPart {
public:
ShaderCoverage() {
m_part =
"const highp vec2 bias[8] = vec2[8] (vec2(-0.5,-0.5), vec2(0.0, -0.5), vec2(-0.25,-0.25), vec2(-0.25, 0.25), \n"
"const highp vec2 bias[8] = vec2[8] (vec2(-0.5,-0.5), vec2(0.0, -0.5), vec2(-0.25,-0.25), vec2(0.25, -0.25), \n"
" vec2(-0.5, 0.0), vec2(0.0,0.0), vec2(-0.25,0.25), vec2(0.25,0.25)); \n"
"highp vec4 dBCdx = dFdx(vBaryCoords); \n"
"highp vec4 dBCdy = dFdy(vBaryCoords); \n"
"cvg = 0.0; \n"
"for (int i = 0; i<8; i++) { \n"
" lowp float addend = 0.125; \n"
" for (int j=0; j<4; j++) { \n"
" addend *= step(0.0, vBaryCoords[j] + dot(vec2(dBCdx[j], dBCdy[j]), bias[i])); \n"
" } \n"
" cvg += addend; \n"
"} \n"
"highp vec4 dBCdx = dFdx(vBaryCoords); \n"
"highp vec4 dBCdy = dFdy(vBaryCoords); \n"
"cvg = 0.0; \n"
"for (int i = 0; i<8; i++) { \n"
" highp vec2 currentBias = bias[i]; \n"
" highp vec4 baryCoordsBiased = vBaryCoords + dBCdx*currentBias.x + dBCdy * currentBias.y; \n"
" lowp vec4 inside = step(0.0, baryCoordsBiased); \n"
" cvg += 0.125 * inside[0] * inside[1] * inside[2] * inside[3]; \n"
"} \n"
;
}
};