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+/**
+ * @file lltinygltfhelper.cpp
+ *
+ * $LicenseInfo:firstyear=2022&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2022, Linden Research, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation;
+ * version 2.1 of the License only.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ * Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
+ * $/LicenseInfo$
+ */
+
+#include "llviewerprecompiledheaders.h"
+
+#include "lltinygltfhelper.h"
+
+#include "llimage.h"
+#include "llviewertexture.h"
+#include "llviewertexturelist.h"
+
+void strip_alpha_channel(LLPointer<LLImageRaw>& img)
+{
+ if (img->getComponents() == 4)
+ {
+ LLImageRaw* tmp = new LLImageRaw(img->getWidth(), img->getHeight(), 3);
+ tmp->copyUnscaled4onto3(img);
+ img = tmp;
+ }
+}
+
+// copy red channel from src_img to dst_img
+// PRECONDITIONS:
+// dst_img must be 3 component
+// src_img and dst_image must have the same dimensions
+void copy_red_channel(LLPointer<LLImageRaw>& src_img, LLPointer<LLImageRaw>& dst_img)
+{
+ llassert(src_img->getWidth() == dst_img->getWidth() && src_img->getHeight() == dst_img->getHeight());
+ llassert(dst_img->getComponents() == 3);
+
+ U32 pixel_count = dst_img->getWidth() * dst_img->getHeight();
+ U8* src = src_img->getData();
+ U8* dst = dst_img->getData();
+ S8 src_components = src_img->getComponents();
+
+ for (U32 i = 0; i < pixel_count; ++i)
+ {
+ dst[i * 3] = src[i * src_components];
+ }
+}
+
+void LLTinyGLTFHelper::initFetchedTextures(tinygltf::Material& material,
+ LLPointer<LLImageRaw>& base_color_img,
+ LLPointer<LLImageRaw>& normal_img,
+ LLPointer<LLImageRaw>& mr_img,
+ LLPointer<LLImageRaw>& emissive_img,
+ LLPointer<LLImageRaw>& occlusion_img,
+ LLPointer<LLViewerFetchedTexture>& base_color_tex,
+ LLPointer<LLViewerFetchedTexture>& normal_tex,
+ LLPointer<LLViewerFetchedTexture>& mr_tex,
+ LLPointer<LLViewerFetchedTexture>& emissive_tex)
+{
+ if (base_color_img)
+ {
+ base_color_tex = LLViewerTextureManager::getFetchedTexture(base_color_img, FTType::FTT_LOCAL_FILE, true);
+ }
+
+ if (normal_img)
+ {
+ strip_alpha_channel(normal_img);
+ normal_tex = LLViewerTextureManager::getFetchedTexture(normal_img, FTType::FTT_LOCAL_FILE, true);
+ }
+
+ if (mr_img)
+ {
+ strip_alpha_channel(mr_img);
+
+ if (occlusion_img && material.pbrMetallicRoughness.metallicRoughnessTexture.index != material.occlusionTexture.index)
+ {
+ // occlusion is a distinct texture from pbrMetallicRoughness
+ // pack into mr red channel
+ int occlusion_idx = material.occlusionTexture.index;
+ int mr_idx = material.pbrMetallicRoughness.metallicRoughnessTexture.index;
+ if (occlusion_idx != mr_idx)
+ {
+ //scale occlusion image to match resolution of mr image
+ occlusion_img->scale(mr_img->getWidth(), mr_img->getHeight());
+
+ copy_red_channel(occlusion_img, mr_img);
+ }
+ }
+ }
+ else if (occlusion_img)
+ {
+ //no mr but occlusion exists, make a white mr_img and copy occlusion red channel over
+ mr_img = new LLImageRaw(occlusion_img->getWidth(), occlusion_img->getHeight(), 3);
+ mr_img->clear(255, 255, 255);
+ copy_red_channel(occlusion_img, mr_img);
+ }
+
+ if (mr_img)
+ {
+ mr_tex = LLViewerTextureManager::getFetchedTexture(mr_img, FTType::FTT_LOCAL_FILE, true);
+ }
+
+ if (emissive_img)
+ {
+ strip_alpha_channel(emissive_img);
+ emissive_tex = LLViewerTextureManager::getFetchedTexture(emissive_img, FTType::FTT_LOCAL_FILE, true);
+ }
+}
+
+LLColor4 LLTinyGLTFHelper::getColor(const std::vector<double>& in)
+{
+ LLColor4 out;
+ for (S32 i = 0; i < llmin((S32)in.size(), 4); ++i)
+ {
+ out.mV[i] = in[i];
+ }
+
+ return out;
+}
+
+const tinygltf::Image * LLTinyGLTFHelper::getImageFromTextureIndex(const tinygltf::Model & model, S32 texture_index)
+{
+ if (texture_index >= 0)
+ {
+ S32 source_idx = model.textures[texture_index].source;
+ if (source_idx >= 0)
+ {
+ return &(model.images[source_idx]);
+ }
+ }
+
+ return nullptr;
+}
+
+LLImageRaw * LLTinyGLTFHelper::getTexture(const std::string & folder, const tinygltf::Model & model, S32 texture_index, std::string & name)
+{
+ const tinygltf::Image* image = getImageFromTextureIndex(model, texture_index);
+ LLImageRaw* rawImage = nullptr;
+
+ if (image != nullptr &&
+ image->bits == 8 &&
+ !image->image.empty() &&
+ image->component <= 4)
+ {
+ name = image->name;
+ rawImage = new LLImageRaw(&image->image[0], image->width, image->height, image->component);
+ rawImage->verticalFlip();
+ rawImage->optimizeAwayAlpha();
+ }
+
+ return rawImage;
+}
+
+LLImageRaw * LLTinyGLTFHelper::getTexture(const std::string & folder, const tinygltf::Model & model, S32 texture_index)
+{
+ const tinygltf::Image* image = getImageFromTextureIndex(model, texture_index);
+ LLImageRaw* rawImage = nullptr;
+
+ if (image != nullptr &&
+ image->bits == 8 &&
+ !image->image.empty() &&
+ image->component <= 4)
+ {
+ rawImage = new LLImageRaw(&image->image[0], image->width, image->height, image->component);
+ rawImage->verticalFlip();
+ }
+
+ return rawImage;
+}
+
+bool LLTinyGLTFHelper::loadModel(const std::string& filename, tinygltf::Model& model_in)
+{
+ std::string exten = gDirUtilp->getExtension(filename);
+
+ if (exten == "gltf" || exten == "glb")
+ {
+ tinygltf::TinyGLTF loader;
+ std::string error_msg;
+ std::string warn_msg;
+
+ std::string filename_lc = filename;
+ LLStringUtil::toLower(filename_lc);
+
+ // Load a tinygltf model fom a file. Assumes that the input filename has already been
+ // been sanitized to one of (.gltf , .glb) extensions, so does a simple find to distinguish.
+ bool decode_successful = false;
+ if (std::string::npos == filename_lc.rfind(".gltf"))
+ { // file is binary
+ decode_successful = loader.LoadBinaryFromFile(&model_in, &error_msg, &warn_msg, filename_lc);
+ }
+ else
+ { // file is ascii
+ decode_successful = loader.LoadASCIIFromFile(&model_in, &error_msg, &warn_msg, filename_lc);
+ }
+
+ if (!decode_successful)
+ {
+ LL_WARNS("GLTF") << "Cannot load, error: Failed to decode" << error_msg
+ << ", warning:" << warn_msg
+ << " file: " << filename
+ << LL_ENDL;
+ return false;
+ }
+
+ if (model_in.materials.empty())
+ {
+ // materials are missing
+ LL_WARNS("GLTF") << "Cannot load. File has no materials " << filename << LL_ENDL;
+ return false;
+ }
+
+ return true;
+ }
+
+
+ return false;
+}
+
+bool LLTinyGLTFHelper::getMaterialFromModel(
+ const std::string& filename,
+ const tinygltf::Model& model_in,
+ S32 mat_index,
+ LLFetchedGLTFMaterial* material,
+ std::string& material_name)
+{
+ llassert(material);
+
+ if (model_in.materials.size() <= mat_index)
+ {
+ // materials are missing
+ LL_WARNS("GLTF") << "Cannot load Material, Material " << mat_index << " is missing, " << filename << LL_ENDL;
+ return false;
+ }
+
+ material->setFromModel(model_in, mat_index);
+
+ std::string folder = gDirUtilp->getDirName(filename);
+ tinygltf::Material material_in = model_in.materials[mat_index];
+
+ material_name = material_in.name;
+
+ // get base color texture
+ LLPointer<LLImageRaw> base_img = LLTinyGLTFHelper::getTexture(folder, model_in, material_in.pbrMetallicRoughness.baseColorTexture.index);
+ // get normal map
+ LLPointer<LLImageRaw> normal_img = LLTinyGLTFHelper::getTexture(folder, model_in, material_in.normalTexture.index);
+ // get metallic-roughness texture
+ LLPointer<LLImageRaw> mr_img = LLTinyGLTFHelper::getTexture(folder, model_in, material_in.pbrMetallicRoughness.metallicRoughnessTexture.index);
+ // get emissive texture
+ LLPointer<LLImageRaw> emissive_img = LLTinyGLTFHelper::getTexture(folder, model_in, material_in.emissiveTexture.index);
+ // get occlusion map if needed
+ LLPointer<LLImageRaw> occlusion_img;
+ if (material_in.occlusionTexture.index != material_in.pbrMetallicRoughness.metallicRoughnessTexture.index)
+ {
+ occlusion_img = LLTinyGLTFHelper::getTexture(folder, model_in, material_in.occlusionTexture.index);
+ }
+
+ LLPointer<LLViewerFetchedTexture> base_color_tex;
+ LLPointer<LLViewerFetchedTexture> normal_tex;
+ LLPointer<LLViewerFetchedTexture> mr_tex;
+ LLPointer<LLViewerFetchedTexture> emissive_tex;
+
+ // todo: pass it into local bitmaps?
+ LLTinyGLTFHelper::initFetchedTextures(material_in,
+ base_img, normal_img, mr_img, emissive_img, occlusion_img,
+ base_color_tex, normal_tex, mr_tex, emissive_tex);
+
+ if (base_color_tex)
+ {
+ base_color_tex->addTextureStats(64.f * 64.f, TRUE);
+ material->mTextureId[LLGLTFMaterial::GLTF_TEXTURE_INFO_BASE_COLOR] = base_color_tex->getID();
+ material->mBaseColorTexture = base_color_tex;
+ }
+ else
+ {
+ material->mTextureId[LLGLTFMaterial::GLTF_TEXTURE_INFO_BASE_COLOR] = LLUUID::null;
+ material->mBaseColorTexture = nullptr;
+ }
+
+ if (normal_tex)
+ {
+ normal_tex->addTextureStats(64.f * 64.f, TRUE);
+ material->mTextureId[LLGLTFMaterial::GLTF_TEXTURE_INFO_NORMAL] = normal_tex->getID();
+ material->mNormalTexture = normal_tex;
+ }
+ else
+ {
+ material->mTextureId[LLGLTFMaterial::GLTF_TEXTURE_INFO_NORMAL] = LLUUID::null;
+ material->mNormalTexture = nullptr;
+ }
+
+ if (mr_tex)
+ {
+ mr_tex->addTextureStats(64.f * 64.f, TRUE);
+ material->mTextureId[LLGLTFMaterial::GLTF_TEXTURE_INFO_METALLIC_ROUGHNESS] = mr_tex->getID();
+ material->mMetallicRoughnessTexture = mr_tex;
+ }
+ else
+ {
+ material->mTextureId[LLGLTFMaterial::GLTF_TEXTURE_INFO_METALLIC_ROUGHNESS] = LLUUID::null;
+ material->mMetallicRoughnessTexture = nullptr;
+ }
+
+ if (emissive_tex)
+ {
+ emissive_tex->addTextureStats(64.f * 64.f, TRUE);
+ material->mTextureId[LLGLTFMaterial::GLTF_TEXTURE_INFO_EMISSIVE] = emissive_tex->getID();
+ material->mEmissiveTexture = emissive_tex;
+ }
+ else
+ {
+ material->mTextureId[LLGLTFMaterial::GLTF_TEXTURE_INFO_EMISSIVE] = LLUUID::null;
+ material->mEmissiveTexture = nullptr;
+ }
+
+ return true;
+}