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/**
* @file llgltfmaterial_templates.h
* @brief Material template definition
*
* $LicenseInfo:firstyear=2023&license=viewerlgpl$
* Second Life Viewer Source Code
* Copyright (C) 2023, 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
* $/LicenseInfo$
*/
#pragma once
#include "llgltfmaterial.h"
// Use templates here as workaround for the different similar texture info classes in tinygltf
// Includer must first include tiny_gltf.h with the desired flags
template<typename T>
std::string gltf_get_texture_image(const tinygltf::Model& model, const T& texture_info)
{
const S32 texture_idx = texture_info.index;
if (texture_idx < 0 || texture_idx >= model.textures.size())
{
return "";
}
const tinygltf::Texture& texture = model.textures[texture_idx];
// Ignore texture.sampler for now
const S32 image_idx = texture.source;
if (image_idx < 0 || image_idx >= model.images.size())
{
return "";
}
const tinygltf::Image& image = model.images[image_idx];
return image.uri;
}
template<typename T>
void LLGLTFMaterial::setFromTexture(const tinygltf::Model& model, const T& texture_info, TextureInfo texture_info_id)
{
setFromTexture(model, texture_info, mTextureId[texture_info_id], mTextureTransform[texture_info_id]);
const std::string uri = gltf_get_texture_image(model, texture_info);
}
// static
template<typename T>
void LLGLTFMaterial::setFromTexture(const tinygltf::Model& model, const T& texture_info, LLUUID& texture_id, TextureTransform& transform)
{
LL_PROFILE_ZONE_SCOPED;
const std::string uri = gltf_get_texture_image(model, texture_info);
texture_id.set(uri);
const tinygltf::Value::Object& extensions_object = texture_info.extensions;
const auto transform_it = extensions_object.find(GLTF_FILE_EXTENSION_TRANSFORM);
if (transform_it != extensions_object.end())
{
const tinygltf::Value& transform_json = std::get<1>(*transform_it);
if (transform_json.IsObject())
{
const tinygltf::Value::Object& transform_object = transform_json.Get<tinygltf::Value::Object>();
transform.mOffset = vec2FromJson(transform_object, GLTF_FILE_EXTENSION_TRANSFORM_OFFSET, getDefaultTextureOffset());
transform.mScale = vec2FromJson(transform_object, GLTF_FILE_EXTENSION_TRANSFORM_SCALE, getDefaultTextureScale());
transform.mRotation = floatFromJson(transform_object, GLTF_FILE_EXTENSION_TRANSFORM_ROTATION, getDefaultTextureRotation());
}
}
}
// static
template<typename T>
void LLGLTFMaterial::allocateTextureImage(tinygltf::Model& model, T& texture_info, const std::string& uri)
{
const S32 image_idx = model.images.size();
model.images.emplace_back();
model.images[image_idx].uri = uri;
// The texture, not to be confused with the texture info
const S32 texture_idx = model.textures.size();
model.textures.emplace_back();
tinygltf::Texture& texture = model.textures[texture_idx];
texture.source = image_idx;
texture_info.index = texture_idx;
}
// static
template<typename T>
void LLGLTFMaterial::writeToTexture(tinygltf::Model& model, T& texture_info, TextureInfo texture_info_id, bool force_write) const
{
writeToTexture(model, texture_info, mTextureId[texture_info_id], mTextureTransform[texture_info_id], force_write);
}
// static
template<typename T>
void LLGLTFMaterial::writeToTexture(tinygltf::Model& model, T& texture_info, const LLUUID& texture_id, const TextureTransform& transform, bool force_write)
{
LL_PROFILE_ZONE_SCOPED;
const bool is_blank_transform = transform == sDefault.mTextureTransform[0];
// Check if this material matches all the fallback values, and if so, then
// skip including it to reduce material size
if (!force_write && texture_id.isNull() && is_blank_transform)
{
return;
}
// tinygltf will discard this texture info if there is no valid texture,
// causing potential loss of information for overrides, so ensure one is
// defined. -Cosmic,2023-01-30
allocateTextureImage(model, texture_info, texture_id.asString());
if (!is_blank_transform)
{
tinygltf::Value::Object transform_map;
transform_map[GLTF_FILE_EXTENSION_TRANSFORM_OFFSET] = tinygltf::Value(tinygltf::Value::Array({
tinygltf::Value(transform.mOffset.mV[VX]),
tinygltf::Value(transform.mOffset.mV[VY])
}));
transform_map[GLTF_FILE_EXTENSION_TRANSFORM_SCALE] = tinygltf::Value(tinygltf::Value::Array({
tinygltf::Value(transform.mScale.mV[VX]),
tinygltf::Value(transform.mScale.mV[VY])
}));
transform_map[GLTF_FILE_EXTENSION_TRANSFORM_ROTATION] = tinygltf::Value(transform.mRotation);
texture_info.extensions[GLTF_FILE_EXTENSION_TRANSFORM] = tinygltf::Value(transform_map);
}
}
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