7 lines
297 B
Metal
7 lines
297 B
Metal
float swizzleAdd(float x, float y, int mask, uint thread_index_in_simdgroup)
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{
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float4 xLut = float4(1.0, -1.0, 1.0, 0.0);
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float4 yLut = float4(1.0, 1.0, -1.0, 1.0);
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int lutIdx = (mask >> (int(thread_index_in_simdgroup & 3u) * 2)) & 3;
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return x * xLut[lutIdx] + y * yLut[lutIdx];
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}
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