28 lines
642 B
Plaintext
28 lines
642 B
Plaintext
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const mat4 ditherMatrix = mat4(
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vec4(0.0625, 0.5625, 0.1875, 0.6875),
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vec4(0.8125, 0.3125, 0.9375, 0.4375),
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vec4(0.25, 0.75, 0.125, 0.625),
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vec4(1.0, 0.5, 0.875, 0.375));
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float dither( float alpha, vec2 pos )
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{
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int x = int( pos.x ) % 4;
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int y = int( pos.y ) % 4;
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float res = 0.0;
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vec4 temp;
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if (x == 0) {temp = ditherMatrix[0];}
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else if (x == 1) temp = ditherMatrix[1];
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else if (x == 2) temp = ditherMatrix[2];
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else if (x == 3) temp = ditherMatrix[3];
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if (y == 0) {res = temp[0];}
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else if (y == 1) res = temp[1];
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else if (y == 2) res = temp[2];
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else if (y == 3) res = temp[3];
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return res;
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}
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