mirror of https://github.com/minetest/minetest.git
144 lines
3.6 KiB
C++
144 lines
3.6 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 "IAnimatedMesh.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 "SMesh.h"
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#include "vector2d.h"
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#include "vector3d.h"
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#include <tiny_gltf.h>
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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 tinygltf::Model& model) noexcept;
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MeshExtractor(const tinygltf::Model&& model) noexcept;
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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::vector<u16> getIndices(const std::size_t meshIdx,
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const std::size_t primitiveIdx) const;
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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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private:
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tinygltf::Model m_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 float scale = 1.0f);
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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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/* Get the scale factor from the glTF mesh information.
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*
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* Returns 1.0f if no scale factor is present.
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*/
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float getScale() 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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BufferOffset getBuffer(const std::size_t accessorIdx) const;
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std::size_t getIndicesAccessorIdx(const std::size_t meshIdx,
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const std::size_t primitiveIdx) const;
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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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* -1 is returned if none are present.
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*/
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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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* -1 is returned if none are present.
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*/
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std::size_t getTCoordAccessorIdx(const std::size_t meshIdx,
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const std::size_t primitiveIdx) const;
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};
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void loadPrimitives(const MeshExtractor& parser, SMesh* mesh);
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static bool tryParseGLTF(io::IReadFile* file,
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tinygltf::Model& model);
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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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