mirror of
https://github.com/minetest/irrlicht.git
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036b40a9d8
* Support u8 / u32 indices * Skip primitives without vertices * Add support for non-indexed geometry & skipping primitives * Fix possible memory leak on error * Use SSkinnedMesh * Check indices * Properly mirror node hierarchy * Update .gitignore * Reorder includes * Add some throws for logic errors * Fix non-indexed geometry winding order, add unit test * Address code review comments * Add matrix transform unit test
147 lines
3.8 KiB
C++
147 lines
3.8 KiB
C++
#ifndef __C_GLTF_MESH_FILE_LOADER_INCLUDED__
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#define __C_GLTF_MESH_FILE_LOADER_INCLUDED__
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#include "ISkinnedMesh.h"
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#include "IMeshLoader.h"
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#include "IReadFile.h"
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#include "irrTypes.h"
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#include "path.h"
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#include "S3DVertex.h"
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#include "vector2d.h"
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#include "vector3d.h"
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#include <tiniergltf.hpp>
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#include <cstddef>
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#include <vector>
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namespace irr
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{
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namespace scene
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{
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class CGLTFMeshFileLoader : public IMeshLoader
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{
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public:
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CGLTFMeshFileLoader() noexcept;
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bool isALoadableFileExtension(const io::path& filename) const override;
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IAnimatedMesh* createMesh(io::IReadFile* file) override;
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private:
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class BufferOffset
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{
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public:
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BufferOffset(const std::vector<unsigned char>& buf,
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const std::size_t offset);
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BufferOffset(const BufferOffset& other,
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const std::size_t fromOffset);
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unsigned char at(const std::size_t fromOffset) const;
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private:
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const std::vector<unsigned char>& m_buf;
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std::size_t m_offset;
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int m_filesize;
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};
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class MeshExtractor {
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public:
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using vertex_t = video::S3DVertex;
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MeshExtractor(const tiniergltf::GlTF &model,
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ISkinnedMesh *mesh) noexcept
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: m_gltf_model(model), m_irr_model(mesh) {};
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MeshExtractor(const tiniergltf::GlTF &&model,
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ISkinnedMesh *mesh) noexcept
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: m_gltf_model(model), m_irr_model(mesh) {};
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/* Gets indices for the given mesh/primitive.
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*
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* Values are return in Irrlicht winding order.
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*/
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std::optional<std::vector<u16>> getIndices(const std::size_t meshIdx,
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const std::size_t primitiveIdx) const;
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std::optional<std::vector<vertex_t>> getVertices(std::size_t meshIdx,
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const std::size_t primitiveIdx) const;
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std::size_t getMeshCount() const;
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std::size_t getPrimitiveCount(const std::size_t meshIdx) const;
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void loadNodes() const;
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private:
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const tiniergltf::GlTF m_gltf_model;
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ISkinnedMesh *m_irr_model;
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template <typename T>
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static T readPrimitive(const BufferOffset& readFrom);
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static core::vector2df readVec2DF(
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const BufferOffset& readFrom);
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/* Read a vec3df from a buffer with transformations applied.
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*
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* Values are returned in Irrlicht coordinates.
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*/
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static core::vector3df readVec3DF(
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const BufferOffset& readFrom,
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const core::vector3df scale);
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void copyPositions(const std::size_t accessorIdx,
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std::vector<vertex_t>& vertices) const;
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void copyNormals(const std::size_t accessorIdx,
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std::vector<vertex_t>& vertices) const;
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void copyTCoords(const std::size_t accessorIdx,
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std::vector<vertex_t>& vertices) const;
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std::size_t getElemCount(const std::size_t accessorIdx) const;
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std::size_t getByteStride(const std::size_t accessorIdx) const;
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bool isAccessorNormalized(const std::size_t accessorIdx) const;
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BufferOffset getBuffer(const std::size_t accessorIdx) const;
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std::optional<std::size_t> getIndicesAccessorIdx(const std::size_t meshIdx,
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const std::size_t primitiveIdx) const;
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std::optional<std::size_t> getPositionAccessorIdx(const std::size_t meshIdx,
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const std::size_t primitiveIdx) const;
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/* Get the accessor id of the normals of a primitive.
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*/
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std::optional<std::size_t> getNormalAccessorIdx(const std::size_t meshIdx,
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const std::size_t primitiveIdx) const;
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/* Get the accessor id for the tcoords of a primitive.
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*/
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std::optional<std::size_t> getTCoordAccessorIdx(const std::size_t meshIdx,
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const std::size_t primitiveIdx) const;
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void loadMesh(
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std::size_t meshIdx,
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ISkinnedMesh::SJoint *parentJoint) const;
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void loadNode(
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const std::size_t nodeIdx,
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ISkinnedMesh::SJoint *parentJoint) const;
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};
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std::optional<tiniergltf::GlTF> tryParseGLTF(io::IReadFile* file);
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};
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} // namespace scene
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} // namespace irr
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#endif // __C_GLTF_MESH_FILE_LOADER_INCLUDED__
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