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Optimize blend weights to use 8-bit per bone (instead of 16-bit)

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This commit is contained in:
Wojtek Figat
2025-01-21 11:40:01 +01:00
parent 0b24c50161
commit 9fd98c8e12
2 changed files with 16 additions and 5 deletions
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15
Source/Engine/Content/Assets/ModelBase.cpp
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@@ -666,6 +666,7 @@ bool ModelBase::SaveLOD(WriteStream& stream, const ModelData& modelData, int32 l
const bool useSeparatePositions = !isSkinned; const bool useSeparatePositions = !isSkinned;
const bool useSeparateColors = !isSkinned; const bool useSeparateColors = !isSkinned;
PixelFormat blendIndicesFormat = PixelFormat::R8G8B8A8_UInt; PixelFormat blendIndicesFormat = PixelFormat::R8G8B8A8_UInt;
PixelFormat blendWeightsFormat = PixelFormat::R8G8B8A8_UNorm;
for (const Int4& indices : mesh.BlendIndices) for (const Int4& indices : mesh.BlendIndices)
{ {
if (indices.MaxValue() > MAX_uint8) if (indices.MaxValue() > MAX_uint8)
@@ -705,7 +706,7 @@ bool ModelBase::SaveLOD(WriteStream& stream, const ModelData& modelData, int32 l
if (isSkinned) if (isSkinned)
{ {
vb.Add({ VertexElement::Types::BlendIndices, vbIndex, 0, 0, blendIndicesFormat }); vb.Add({ VertexElement::Types::BlendIndices, vbIndex, 0, 0, blendIndicesFormat });
vb.Add({ VertexElement::Types::BlendWeights, vbIndex, 0, 0, PixelFormat::R16G16B16A16_Float }); vb.Add({ VertexElement::Types::BlendWeights, vbIndex, 0, 0, blendWeightsFormat });
} }
if (!useSeparateColors && hasColors) if (!useSeparateColors && hasColors)
vb.Add({ VertexElement::Types::Color, vbIndex, 0, 0, PixelFormat::R8G8B8A8_UNorm }); vb.Add({ VertexElement::Types::Color, vbIndex, 0, 0, PixelFormat::R8G8B8A8_UNorm });
@@ -784,7 +785,7 @@ bool ModelBase::SaveLOD(WriteStream& stream, const ModelData& modelData, int32 l
const Color32 blendIndicesEnc(blendIndices.X, blendIndices.Y, blendIndices.Z, blendIndices.W); const Color32 blendIndicesEnc(blendIndices.X, blendIndices.Y, blendIndices.Z, blendIndices.W);
stream.Write(blendIndicesEnc); stream.Write(blendIndicesEnc);
} }
else else //if (blendWeightsFormat == PixelFormat::R16G16B16A16_UInt)
{ {
// 16-bit indices // 16-bit indices
const uint16 blendIndicesEnc[4] = { (uint16)blendIndices.X, (uint16)blendIndices.Y, (uint16)blendIndices.Z, (uint16)blendIndices.W }; const uint16 blendIndicesEnc[4] = { (uint16)blendIndices.X, (uint16)blendIndices.Y, (uint16)blendIndices.Z, (uint16)blendIndices.W };
@@ -795,8 +796,18 @@ bool ModelBase::SaveLOD(WriteStream& stream, const ModelData& modelData, int32 l
case VertexElement::Types::BlendWeights: case VertexElement::Types::BlendWeights:
{ {
const Float4 blendWeights = mesh.BlendWeights.Get()[vertex]; const Float4 blendWeights = mesh.BlendWeights.Get()[vertex];
if (blendWeightsFormat == PixelFormat::R8G8B8A8_UNorm)
{
// 8-bit weights
const Color32 blendWeightsEnc(blendWeights);
stream.Write(blendWeightsEnc);
}
else //if (blendWeightsFormat == PixelFormat::R16G16B16A16_Float)
{
// 16-bit weights
const Half4 blendWeightsEnc(blendWeights); const Half4 blendWeightsEnc(blendWeights);
stream.Write(blendWeightsEnc); stream.Write(blendWeightsEnc);
}
break; break;
} }
case VertexElement::Types::TexCoord0: case VertexElement::Types::TexCoord0:

2
Source/Engine/Graphics/Models/SkinnedMesh.cpp
View File

@@ -62,7 +62,7 @@ namespace
vb0elements.Add({ VertexElement::Types::Tangent, 0, 0, 0, PixelFormat::R10G10B10A2_UNorm }); vb0elements.Add({ VertexElement::Types::Tangent, 0, 0, 0, PixelFormat::R10G10B10A2_UNorm });
} }
vb0elements.Add({ VertexElement::Types::BlendIndices, 0, 0, 0, PixelFormat::R8G8B8A8_UInt }); vb0elements.Add({ VertexElement::Types::BlendIndices, 0, 0, 0, PixelFormat::R8G8B8A8_UInt });
vb0elements.Add({ VertexElement::Types::BlendWeights, 0, 0, 0, PixelFormat::R16G16B16A16_Float }); vb0elements.Add({ VertexElement::Types::BlendWeights, 0, 0, 0, PixelFormat::R8G8B8A8_UNorm });
if (uvs) if (uvs)
vb0elements.Add({ VertexElement::Types::TexCoord, 0, 0, 0, PixelFormat::R16G16_Float }); vb0elements.Add({ VertexElement::Types::TexCoord, 0, 0, 0, PixelFormat::R16G16_Float });
if (colors) if (colors)