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

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