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Enable support for writing binary glTF.

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This commit is contained in:
David Harmon 2018-08-30 08:06:05 -04:00
parent be718436c1
commit da9eac2fbe
1 changed files with 39 additions and 4 deletions
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41
tiny_gltf.h
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@ -874,7 +874,8 @@ class TinyGLTF {
///
bool WriteGltfSceneToFile(Model *model, const std::string &filename,
bool embedImages,
bool embedBuffers /*, bool writeBinary*/);
bool embedBuffers,
bool writeBinary);
///
/// Set callback to use for loading image data
@ -4238,10 +4239,39 @@ static void WriteGltfFile(const std::string &output,
gltfFile << content << std::endl;
}
static void WriteBinaryGltfFile(const std::string &output,
const std::string &content) {
std::ofstream gltfFile(output.c_str(), std::ios::binary);
const std::string header = "glTF";
const int version = 2;
const int padding_size = content.size() % 4;
// 12 bytes for header, JSON content length, 8 bytes for JSON chunk info, padding
const int length = 12 + 8 + content.size() + padding_size;
gltfFile.write(header.c_str(), header.size());
gltfFile.write(reinterpret_cast<const char *>(&version), sizeof(version));
gltfFile.write(reinterpret_cast<const char *>(&length), sizeof(length));
// JSON chunk info, then JSON data
const int model_length = content.size() + padding_size;
const int model_format = 0x4E4F534A;
gltfFile.write(reinterpret_cast<const char *>(&model_length), sizeof(model_length));
gltfFile.write(reinterpret_cast<const char *>(&model_format), sizeof(model_format));
gltfFile.write(content.c_str(), content.size());
// Chunk must be multiplies of 4, so pad with spaces
if (padding_size > 0) {
const std::string padding = std::string(padding_size, ' ');
gltfFile.write(padding.c_str(), padding.size());
}
}
bool TinyGLTF::WriteGltfSceneToFile(Model *model, const std::string &filename,
bool embedImages = false,
bool embedBuffers = false
/*, bool writeBinary*/) {
bool embedBuffers = false,
bool writeBinary = false) {
json output;
// ACCESSORS
@ -4458,7 +4488,12 @@ bool TinyGLTF::WriteGltfSceneToFile(Model *model, const std::string &filename,
SerializeValue("extras", model->extras, output);
}
if (writeBinary) {
WriteBinaryGltfFile(filename, output.dump());
} else {
WriteGltfFile(filename, output.dump());
}
return true;
}