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bit shifts instead of if else also comments

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This commit is contained in:
Michael Riegger
2021-04-28 18:09:37 -07:00
parent 815c02fb57
commit 59077f068c
1 changed files with 7 additions and 26 deletions
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Gems/Atom/Feature/Common/Assets/ShaderLib/Atom/Features/PBR/Lights/PointLight.azsli
+7 -26
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@@ -48,33 +48,14 @@ int GetPointLightShadowCubemapFace(const float3 targetPos, const float3 lightPos
}
}
int UnpackPointLightShadowIndex(const ViewSrg::PointLight light, const int i)
// PointLight::m_shadowIndices actually consists of uint16_t x 6 on the CPU, but visible as a uint32_t x 3 on the GPU.
// This function returns the proper uint16_t value given an input face in the range 0-5
int UnpackPointLightShadowIndex(const ViewSrg::PointLight light, const int face)
{
if (i == 0)
{
return light.m_shadowIndices[0] & 0xFFFF;
}
else if (i==1)
{
return (light.m_shadowIndices[0] >> 16) & 0xFFFF;
}
else if (i==2)
{
return (light.m_shadowIndices[1]) & 0xFFFF;
}
else if (i==3)
{
return (light.m_shadowIndices[1] >> 16) & 0xFFFF;
}
else if (i==4)
{
return (light.m_shadowIndices[2]) & 0xFFFF;
}
else
{
return (light.m_shadowIndices[2] >> 16) & 0xFFFF;
}
}
const int index = face >> 1;
const int shiftAmount = (face & 1) * 16;
return (light.m_shadowIndices[index] >> shiftAmount) & 0xFFFF;
}
void ApplyPointLight(ViewSrg::PointLight light, Surface surface, inout LightingData lightingData)
{