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// Pass-2: AA on Texture
// Note: gcv_FboTexCoord is in center of sample pixels, origin is bottom left!
//
// Same as flipquad - but w/ rgss coordinates
float sampleCount = gcu_FboTexSize.z;
vec2 psize = 1.0 / gcu_FboTexSize.xy; // pixel size
vec2 normFragCoord = gl_FragCoord.xy - vec2(0.5, 0.5); // normalize center 0.5/0.5 -> 0/0
vec2 modPos = mod(normFragCoord, 2.0);
float orient = mod(modPos.x + modPos.y, 2.0); // mirrored on all odd columns, alternating each row (checker-board pattern)
vec2 texCoord = gcv_FboTexCoord.st;
float edge1Q = ( sampleCount / 2.0 ) - 1.0;
vec4 t;
// #define GetSample(texUnit, texCoord, psize, cx, cy, offX, offY) texture2D(texUnit, texCoord + psize * vec2(cx+offX, cy+offY))
if( 0.0 == orient ) {
// SWIPE LEFT -> RIGHT
t = GetSample(gcu_FboTexUnit, texCoord, psize, -edge1Q, 0.0, -0.5, 0.5)*0.25; // upper-left [p1]
t += GetSample(gcu_FboTexUnit, texCoord, psize, 0.0, -edge1Q, -0.5, -0.5)*0.25; // lower-left [p3]
t += GetSample(gcu_FboTexUnit, texCoord, psize, 0.0, edge1Q, 0.5, 0.5)*0.25; // upper-right [p2]
t += GetSample(gcu_FboTexUnit, texCoord, psize, edge1Q, 0.0, 0.5, -0.5)*0.25; // lower-right [p4]
} else {
t = GetSample(gcu_FboTexUnit, texCoord, psize, -edge1Q, 0.0, -0.5, -0.5)*0.25; // lower-left [p4]
t += GetSample(gcu_FboTexUnit, texCoord, psize, 0.0, edge1Q, -0.5, 0.5)*0.25; // upper-left [p3]
t += GetSample(gcu_FboTexUnit, texCoord, psize, 0.0, -edge1Q, 0.5, -0.5)*0.25; // lower-right [p2]
t += GetSample(gcu_FboTexUnit, texCoord, psize, edge1Q, 0.0, 0.5, 0.5)*0.25; // upper-right [p1]
}
#if USE_DISCARD
if( 0.0 == t.w ) {
discard; // discard freezes NV tegra2 compiler
} else {
mgl_FragColor = t;
}
#else
mgl_FragColor = t;
#endif
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