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41 lines
1.9 KiB
41 lines
1.9 KiB
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// Pass-2: AA on Texture
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// Note: gcv_FboTexCoord is in center of sample pixels, origin is bottom left!
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float sampleCount = gcu_FboTexSize.z;
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vec2 psize = 1.0 / gcu_FboTexSize.xy; // pixel size
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// Just poles (NW, SW, ..)
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float edge1H = sampleCount / 2.0;
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float edge1T = sampleCount / 3.0;
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float edgeTH = edge1H-edge1T;
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vec2 normFragCoord = gl_FragCoord.xy - vec2(0.5, 0.5); // normalize center 0.5/0.5 -> 0/0
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vec2 modPos = mod(normFragCoord, 2.0);
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float orient = mod(modPos.x + modPos.y, 2.0); // mirrored on all odd columns, alternating each row (checker-board pattern)
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vec2 texCoord = gcv_FboTexCoord.st;
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vec4 t;
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if( 0.0 == orient ) {
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// SWIPE LEFT -> RIGHT
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t = GetSample(gcu_FboTexUnit, texCoord, psize, -edge1H, edgeTH, 0.0, 0.0)*0.25; // upper-left [p1]
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t += GetSample(gcu_FboTexUnit, texCoord, psize, -edgeTH, -edge1H, 0.0, 0.0)*0.25; // lower-left [p3]
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t += GetSample(gcu_FboTexUnit, texCoord, psize, edgeTH, edge1H, 0.0, 0.0)*0.25; // upper-right [p2]
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t += GetSample(gcu_FboTexUnit, texCoord, psize, edge1H, -edgeTH, 0.0, 0.0)*0.25; // lower-right [p4]
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} else {
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t = GetSample(gcu_FboTexUnit, texCoord, psize, -edge1H, -edgeTH, 0.0, 0.0)*0.25; // lower-left [p4]
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t += GetSample(gcu_FboTexUnit, texCoord, psize, -edgeTH, edge1H, 0.0, 0.0)*0.25; // upper-left [p3]
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t += GetSample(gcu_FboTexUnit, texCoord, psize, edgeTH, -edge1H, 0.0, 0.0)*0.25; // lower-right [p2]
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t += GetSample(gcu_FboTexUnit, texCoord, psize, edge1H, edgeTH, 0.0, 0.0)*0.25; // upper-right [p1]
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}
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#if 0
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if(t.w == 0.0){
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discard; // discard freezes NV tegra2 compiler
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}
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#endif
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mgl_FragColor = t;
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