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VideoCommon: Add comment explaining why only the first normal gets normalized

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Co-authored-by: Scott Mansell <phiren@gmail.com>
This commit is contained in:
Pokechu22
2022-04-19 17:46:20 -07:00
parent 2a5c77f43f
commit 784079853d
3 changed files with 15 additions and 2 deletions
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6
Source/Core/VideoCommon/VertexShaderGen.cpp
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@ -258,7 +258,11 @@ ShaderCode GenerateVertexShaderCode(APIType api_type, const ShaderHostConfig& ho
if ((uid_data->components & VB_HAS_BINORMAL) == 0)
out.Write("float3 rawbinormal = " I_CACHED_BINORMAL ".xyz;\n");
// Only the first normal gets normalized (TODO: why?)
// The scale of the transform matrix is used to control the size of the emboss map effect, by
// changing the scale of the transformed binormals (which only get used by emboss map texgens).
// By normalising the first transformed normal (which is used by lighting calculations and needs
// to be unit length), the same transform matrix can do double duty, scaling for emboss mapping,
// and not scaling for lighting.
out.Write("float3 _normal = normalize(float3(dot(N0, rawnormal), dot(N1, rawnormal), dot(N2, "
"rawnormal)));\n"
"float3 _tangent = float3(dot(N0, rawtangent), dot(N1, rawtangent), dot(N2, "