11 lines
435 B
GLSL
11 lines
435 B
GLSL
float Helper_ShuffleDown(float x, uint index, uint mask, out bool valid)
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{
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uint clamp = mask & 0x1fu;
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uint segMask = (mask >> 8) & 0x1fu;
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uint minThreadId = gl_SubGroupInvocationARB & segMask;
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uint maxThreadId = minThreadId | (clamp & ~segMask);
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uint srcThreadId = gl_SubGroupInvocationARB + index;
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valid = srcThreadId <= maxThreadId;
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float v = readInvocationARB(x, srcThreadId);
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return valid ? v : x;
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} |