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Nascent embedded texture parsing 

Untested since tinyusdz doesn't yet fully support embedded textures
pull/5522/head
Steve M 2024-04-05 19:58:25 -07:00
parent f232e45846
commit 47ed2f5b29
1 changed files with 39 additions and 0 deletions
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39
code/AssetLib/USD/USDLoaderImplTinyusdz.cpp
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@ -275,12 +275,51 @@ void USDImporterImplTinyusdz::textures(
(void) numTextures; // Ignore unused variable when -Werror enabled
}
/**
* "owned" as in, used "new" to allocate and aiScene now responsible for "delete"
*
* @param render_scene renderScene object
* @param image textureImage object
* @param nameWExt filename w/ext (use to extract file type hint)
* @return aiTexture ptr
*/
static aiTexture *ownedEmbeddedTextureFor(
const tinyusdz::tydra::RenderScene &render_scene,
const tinyusdz::tydra::TextureImage &image,
const std::string &nameWExt) {
aiTexture *tex = new aiTexture();
tex->mFilename.Set(image.asset_identifier.c_str());
size_t pos = nameWExt.find_last_of('.');
strncpy(tex->achFormatHint, nameWExt.substr(pos + 1).c_str(), 3);
tex->mHeight = 0;
tex->mWidth = render_scene.buffers[image.buffer_id].data.size();
tex->pcData = (aiTexel *) new char[tex->mWidth];
memcpy(tex->pcData, &render_scene.buffers[image.buffer_id].data[0], tex->mWidth);
return tex;
}
void USDImporterImplTinyusdz::textureImages(
const tinyusdz::tydra::RenderScene &render_scene,
aiScene *pScene,
const std::string &nameWExt) {
const size_t numTextureImages{render_scene.images.size()};
(void) numTextureImages; // Ignore unused variable when -Werror enabled
pScene->mTextures = nullptr; // Need to iterate over images before knowing if valid textures available
pScene->mNumTextures = 0;
for (const auto &image : render_scene.images) {
if (image.buffer_id > -1 &&
image.buffer_id < render_scene.buffers.size() &&
!render_scene.buffers[image.buffer_id].data.empty()) {
aiTexture *tex = ownedEmbeddedTextureFor(
render_scene,
image,
nameWExt);
if (pScene->mTextures == nullptr) {
pScene->mTextures = new aiTexture *[render_scene.images.size()];
}
pScene->mTextures[pScene->mNumTextures++] = tex;
}
}
}
void USDImporterImplTinyusdz::buffers(