vtkGLTFUtils.h

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// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
 
#ifndef vtkGLTFUtils_h
#define vtkGLTFUtils_h
 
#include "vtkABINamespace.h"
 
#include <vtk_nlohmannjson.h>
#include VTK_NLOHMANN_JSON(json.hpp)
 
#include <string> // For string
#include <vector> // For vector
 
VTK_ABI_NAMESPACE_BEGIN
class vtkResourceStream;
class vtkURILoader;
VTK_ABI_NAMESPACE_END
 
namespace vtkGLTFUtils
{
VTK_ABI_NAMESPACE_BEGIN
using ChunkInfoType = std::pair<std::string, uint32_t>;
// Binary glTF constants
static constexpr uint32_t GLBWordSize = 4;
static constexpr uint32_t GLBHeaderSize = 12;
static constexpr uint32_t GLBChunkHeaderSize = 8;
static constexpr uint32_t GLBVersion = 2;
 
bool ValidateGLBFile(const std::string& magic, uint32_t version, uint32_t fileLength,
  std::vector<vtkGLTFUtils::ChunkInfoType> chunkInfo);
 
bool ExtractGLBFileInformation(vtkResourceStream* stream, uint32_t& version, uint32_t& fileLength,
  uint32_t glbStart, std::vector<vtkGLTFUtils::ChunkInfoType>& chunkInfo);
 
bool GetIntValue(const nlohmann::json& root, const std::string& key, int& value);
 
bool GetUIntValue(const nlohmann::json& root, const std::string& key, unsigned int& value);
 
bool GetDoubleValue(const nlohmann::json& root, const std::string& key, double& value);
 
bool GetStringValue(const nlohmann::json& root, const std::string& key, std::string& value);
 
bool GetBoolValue(const nlohmann::json& root, const std::string& key, bool& value);
 
bool GetIntArray(const nlohmann::json& root, const std::string& key, std::vector<int>& value);
 
bool GetUIntArray(
  const nlohmann::json& root, const std::string& key, std::vector<unsigned int>& value);
 
bool GetFloatArray(const nlohmann::json& root, const std::string& key, std::vector<float>& value);
 
bool GetDoubleArray(const nlohmann::json& root, const std::string& key, std::vector<double>& value);
 
bool CheckVersion(const nlohmann::json& glTFAsset);
 
bool GetBinaryBufferFromUri(
  const std::string& uri, vtkURILoader* loader, std::vector<char>& buffer, size_t bufferSize);
 
VTK_ABI_NAMESPACE_END
}
 
#endif
 
// VTK-HeaderTest-Exclude: vtkGLTFUtils.h