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Pyromuffin/Integer rotate shader.hlsl

Last active July 10, 2018 18:11
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Integer rotate shader.hlsl
uint2 IntegerRotate(int2 right, int2 up, int2 offset, uint2 pos)
{
static const int BIG_NUMBER_EXPONENT = 20;
uint2 rotatedPos;
rotatedPos.x = pos.x * right.x + pos.y * right.y;
rotatedPos.y = pos.x * up.x + pos.y * up.y;
rotatedPos += offset;
rotatedPos = rotatedPos >> BIG_NUMBER_EXPONENT;
return rotatedPos;
}
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