irrlicht/source/Irrlicht/CGLTFMeshFileLoader.h

106 lines
2.2 KiB
C++

#ifndef __C_GLTF_MESH_FILE_LOADER_INCLUDED__
#define __C_GLTF_MESH_FILE_LOADER_INCLUDED__
#include "IAnimatedMesh.h"
#include "IMeshLoader.h"
#include "IReadFile.h"
#include "irrTypes.h"
#include "path.h"
#include "S3DVertex.h"
#include "vector2d.h"
#include "vector3d.h"
#include <tiny_gltf.h>
#include <cstddef>
#include <vector>
namespace irr
{
namespace scene
{
class CGLTFMeshFileLoader : public IMeshLoader
{
public:
CGLTFMeshFileLoader() noexcept;
bool isALoadableFileExtension(const io::path& filename) const override;
IAnimatedMesh* createMesh(io::IReadFile* file) override;
private:
template <typename T>
struct Span
{
T* buffer = nullptr;
std::size_t size = 0;
};
class BufferOffset
{
public:
BufferOffset(const std::vector<unsigned char>& buf,
const std::size_t offset);
BufferOffset(const BufferOffset& other,
const std::size_t fromOffset);
unsigned char at(const std::size_t fromOffset) const;
private:
const std::vector<unsigned char>& m_buf;
std::size_t m_offset;
int m_filesize;
};
class ModelParser {
public:
ModelParser(const tinygltf::Model& model);
ModelParser(const tinygltf::Model&& model);
void getIndices(const std::size_t accessorId,
std::vector<u16>& outIndices) const;
void getVertices(const std::size_t accessorId,
Span<video::S3DVertex>& outVertices,
std::size_t meshIndex,
std::size_t primitiveIndex) const;
private:
tinygltf::Model m_model;
template <typename T>
static T readPrimitive(const BufferOffset& readFrom);
static core::vector2df readVec2DF(
const BufferOffset& readFrom);
static core::vector3df readVec3DF(
const BufferOffset& readFrom,
const float scale);
void copyPositions(const Span<video::S3DVertex> vertices,
const std::size_t accessorId) const;
void copyNormals(const Span<video::S3DVertex> vertices,
const std::size_t accessorId) const;
void copyTCoords(const Span<video::S3DVertex> vertices,
const std::size_t accessorId) const;
float getScale() const;
};
static bool tryParseGLTF(io::IReadFile* file,
tinygltf::Model& model);
};
} // namespace scene
} // namespace irr
#endif // __C_GLTF_MESH_FILE_LOADER_INCLUDED__