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chore: dump gltf skin inverseBindMatrices

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Jan 2024-05-11 00:35:18 +02:00
parent 6a1962b65a
commit 5c06b6e5e4
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1 changed files with 57 additions and 1 deletions
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58
src/ObjWriting/XModel/Gltf/GltfWriter.cpp
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@ -41,9 +41,9 @@ namespace
CreateMeshNode(gltf, xmodel); CreateMeshNode(gltf, xmodel);
CreateRootNode(gltf, xmodel); CreateRootNode(gltf, xmodel);
CreateMaterials(gltf, xmodel); CreateMaterials(gltf, xmodel);
CreateSkin(gltf, xmodel);
CreateBufferViews(gltf, xmodel); CreateBufferViews(gltf, xmodel);
CreateAccessors(gltf, xmodel); CreateAccessors(gltf, xmodel);
CreateSkin(gltf, xmodel);
CreateMesh(gltf, xmodel); CreateMesh(gltf, xmodel);
CreateScene(gltf, xmodel); CreateScene(gltf, xmodel);
FillBufferData(gltf, xmodel, bufferData); FillBufferData(gltf, xmodel, bufferData);
@ -260,6 +260,8 @@ namespace
for (auto boneIndex = 0u; boneIndex < boneCount; boneIndex++) for (auto boneIndex = 0u; boneIndex < boneCount; boneIndex++)
skin.joints.emplace_back(boneIndex + m_first_bone_node); skin.joints.emplace_back(boneIndex + m_first_bone_node);
skin.inverseBindMatrices = m_inverse_bind_matrices_accessor;
gltf.skins->emplace_back(std::move(skin)); gltf.skins->emplace_back(std::move(skin));
} }
@ -316,6 +318,15 @@ namespace
m_weights_buffer_view = gltf.bufferViews->size(); m_weights_buffer_view = gltf.bufferViews->size();
gltf.bufferViews->emplace_back(weightsBufferView); gltf.bufferViews->emplace_back(weightsBufferView);
JsonBufferView inverseBindMatricesBufferView;
inverseBindMatricesBufferView.buffer = 0u;
inverseBindMatricesBufferView.byteOffset = bufferOffset;
inverseBindMatricesBufferView.byteLength = sizeof(float) * xmodel.m_bones.size() * 16u;
bufferOffset += inverseBindMatricesBufferView.byteLength;
m_inverse_bind_matrices_buffer_view = gltf.bufferViews->size();
gltf.bufferViews->emplace_back(inverseBindMatricesBufferView);
} }
m_first_index_buffer_view = gltf.bufferViews->size(); m_first_index_buffer_view = gltf.bufferViews->size();
@ -381,6 +392,14 @@ namespace
weightsAccessor.type = JsonAccessorType::VEC4; weightsAccessor.type = JsonAccessorType::VEC4;
m_weights_accessor = gltf.accessors->size(); m_weights_accessor = gltf.accessors->size();
gltf.accessors->emplace_back(weightsAccessor); gltf.accessors->emplace_back(weightsAccessor);
JsonAccessor inverseBindMatricesAccessor;
inverseBindMatricesAccessor.bufferView = m_inverse_bind_matrices_buffer_view;
inverseBindMatricesAccessor.componentType = JsonAccessorComponentType::FLOAT;
inverseBindMatricesAccessor.count = xmodel.m_bones.size();
inverseBindMatricesAccessor.type = JsonAccessorType::MAT4;
m_inverse_bind_matrices_accessor = gltf.accessors->size();
gltf.accessors->emplace_back(inverseBindMatricesAccessor);
} }
m_first_index_accessor = gltf.accessors->size(); m_first_index_accessor = gltf.accessors->size();
@ -482,6 +501,37 @@ namespace
} }
currentBufferOffset += (sizeof(uint8_t) + sizeof(float)) * 4u * xmodel.m_vertex_bone_weights.size(); currentBufferOffset += (sizeof(uint8_t) + sizeof(float)) * 4u * xmodel.m_vertex_bone_weights.size();
auto* inverseBindMatrixData = reinterpret_cast<float*>(&bufferData[currentBufferOffset]);
for (const auto& bone : xmodel.m_bones)
{
Matrix32 inverseBindMatrix;
inverseBindMatrix.m_data[0][3] = -bone.globalOffset[0];
inverseBindMatrix.m_data[1][3] = -bone.globalOffset[2];
inverseBindMatrix.m_data[2][3] = bone.globalOffset[1];
// In-memory = row major
// gltf = column major
inverseBindMatrixData[0] = inverseBindMatrix.m_data[0][0];
inverseBindMatrixData[1] = inverseBindMatrix.m_data[1][0];
inverseBindMatrixData[2] = inverseBindMatrix.m_data[2][0];
inverseBindMatrixData[3] = inverseBindMatrix.m_data[3][0];
inverseBindMatrixData[4] = inverseBindMatrix.m_data[0][1];
inverseBindMatrixData[5] = inverseBindMatrix.m_data[1][1];
inverseBindMatrixData[6] = inverseBindMatrix.m_data[2][1];
inverseBindMatrixData[7] = inverseBindMatrix.m_data[3][1];
inverseBindMatrixData[8] = inverseBindMatrix.m_data[0][2];
inverseBindMatrixData[9] = inverseBindMatrix.m_data[1][2];
inverseBindMatrixData[10] = inverseBindMatrix.m_data[2][2];
inverseBindMatrixData[11] = inverseBindMatrix.m_data[3][2];
inverseBindMatrixData[12] = inverseBindMatrix.m_data[0][3];
inverseBindMatrixData[13] = inverseBindMatrix.m_data[1][3];
inverseBindMatrixData[14] = inverseBindMatrix.m_data[2][3];
inverseBindMatrixData[15] = inverseBindMatrix.m_data[3][3];
inverseBindMatrixData += 16u;
}
currentBufferOffset += sizeof(float) * 16u * xmodel.m_bones.size();
} }
for (const auto& object : xmodel.m_objects) for (const auto& object : xmodel.m_objects)
@ -508,7 +558,11 @@ namespace
if (!xmodel.m_vertex_bone_weights.empty()) if (!xmodel.m_vertex_bone_weights.empty())
{ {
// Joints and weights
result += xmodel.m_vertices.size() * 4u * (sizeof(uint8_t) + sizeof(float)); result += xmodel.m_vertices.size() * 4u * (sizeof(uint8_t) + sizeof(float));
// Inverse bind matrices
result += xmodel.m_bones.size() * 16u * sizeof(float);
} }
for (const auto& object : xmodel.m_objects) for (const auto& object : xmodel.m_objects)
@ -541,9 +595,11 @@ namespace
unsigned m_uv_accessor = 0u; unsigned m_uv_accessor = 0u;
unsigned m_joints_accessor = 0u; unsigned m_joints_accessor = 0u;
unsigned m_weights_accessor = 0u; unsigned m_weights_accessor = 0u;
unsigned m_inverse_bind_matrices_accessor = 0u;
unsigned m_vertex_buffer_view = 0u; unsigned m_vertex_buffer_view = 0u;
unsigned m_joints_buffer_view = 0u; unsigned m_joints_buffer_view = 0u;
unsigned m_weights_buffer_view = 0u; unsigned m_weights_buffer_view = 0u;
unsigned m_inverse_bind_matrices_buffer_view = 0u;
unsigned m_first_index_buffer_view = 0u; unsigned m_first_index_buffer_view = 0u;
unsigned m_first_index_accessor = 0u; unsigned m_first_index_accessor = 0u;