ryujinx/Ryujinx.Graphics.Shader/CodeGen/Glsl/HelperFunctions/ShuffleDown.glsl
gdkchan 4b7c7dab9e
Support multiple destination operands on shader IR and shuffle predicates (#1964)
* Support multiple destination operands on shader IR and shuffle predicates

* Cache version change
2021-01-28 10:59:47 +11:00

10 lines
418 B
GLSL

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;
return valid ? readInvocationARB(x, srcThreadId) : x;
}