ryujinx/Ryujinx.Graphics.Shader/CodeGen/Glsl/HelperFunctions/ShuffleDown.glsl

float Helper_ShuffleDown(float x, uint index, uint mask, out bool valid)
{
    uint clamp = mask & 0x1fu;
    uint segMask = (mask >> 8) & 0x1fu;
    uint minThreadId = $SUBGROUP_INVOCATION$ & segMask;
    uint maxThreadId = minThreadId | (clamp & ~segMask);
    uint srcThreadId = $SUBGROUP_INVOCATION$ + index;
    valid = srcThreadId <= maxThreadId;
    float v = $SUBGROUP_BROADCAST$(x, srcThreadId);
    return valid ? v : x;
}
Support multiple destination operands on shader IR and shuffle predicates (#1964) * Support multiple destination operands on shader IR and shuffle predicates * Cache version change 2021-01-27 23:59:47 +00:00			`float Helper_ShuffleDown(float x, uint index, uint mask, out bool valid)`
Implement BFI, BRK, FLO, FSWZADD, PBK, SHFL and TXD shader instructions, misc. fixes 2019-10-31 03:29:22 +00:00			`{`
			`uint clamp = mask & 0x1fu;`
			`uint segMask = (mask >> 8) & 0x1fu;`
Use shader subgroup extensions if shader ballot is not supported (#2627) * Use shader subgroup extensions if shader ballot is not supported * Shader cache version bump + cleanup * The type is still required on the table 2021-09-19 12:38:39 +00:00			`uint minThreadId = $SUBGROUP_INVOCATION$ & segMask;`
Implement BFI, BRK, FLO, FSWZADD, PBK, SHFL and TXD shader instructions, misc. fixes 2019-10-31 03:29:22 +00:00			`uint maxThreadId = minThreadId \| (clamp & ~segMask);`
Use shader subgroup extensions if shader ballot is not supported (#2627) * Use shader subgroup extensions if shader ballot is not supported * Shader cache version bump + cleanup * The type is still required on the table 2021-09-19 12:38:39 +00:00			`uint srcThreadId = $SUBGROUP_INVOCATION$ + index;`
Support multiple destination operands on shader IR and shuffle predicates (#1964) * Support multiple destination operands on shader IR and shuffle predicates * Cache version change 2021-01-27 23:59:47 +00:00			`valid = srcThreadId <= maxThreadId;`
Use shader subgroup extensions if shader ballot is not supported (#2627) * Use shader subgroup extensions if shader ballot is not supported * Shader cache version bump + cleanup * The type is still required on the table 2021-09-19 12:38:39 +00:00			`float v = $SUBGROUP_BROADCAST$(x, srcThreadId);`
Fix out-of-bounds shader thread shuffle (#2605) * Fix out-of-bounds shader thread shuffle * Shader cache version bump 2021-08-30 17:02:40 +00:00			`return valid ? v : x;`
Implement BFI, BRK, FLO, FSWZADD, PBK, SHFL and TXD shader instructions, misc. fixes 2019-10-31 03:29:22 +00:00			`}`