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/**
* @file llgltfmaterial.cpp
* @brief Material definition
*
* $LicenseInfo:firstyear=2022&license=viewerlgpl$
* 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 "linden_common.h"
#include "llgltfmaterial.h"
#include "tiny_gltf.h"
bool LLGLTFMaterial::fromJSON(const std::string& json, std::string& warn_msg, std::string& error_msg)
{
tinygltf::TinyGLTF gltf;
tinygltf::Model model_in;
if (gltf.LoadASCIIFromString(&model_in, &error_msg, &warn_msg, json.c_str(), json.length(), ""))
{
setFromModel(model_in, 0);
//DEBUG generate json and print
LL_INFOS() << asJSON(true) << LL_ENDL;
return true;
}
return false;
}
std::string LLGLTFMaterial::asJSON(bool prettyprint) const
{
tinygltf::TinyGLTF gltf;
tinygltf::Model model_out;
std::ostringstream str;
writeToModel(model_out, 0);
gltf.WriteGltfSceneToStream(&model_out, str, prettyprint, false);
return str.str();
}
void LLGLTFMaterial::setFromModel(const tinygltf::Model& model, S32 mat_index)
{
if (model.materials.size() <= mat_index)
{
return;
}
const tinygltf::Material& material_in = model.materials[mat_index];
// get base color texture
S32 tex_index = material_in.pbrMetallicRoughness.baseColorTexture.index;
if (tex_index >= 0)
{
mBaseColorId.set(model.images[tex_index].uri);
}
else
{
mBaseColorId.setNull();
}
// get normal map
tex_index = material_in.normalTexture.index;
if (tex_index >= 0)
{
mNormalId.set(model.images[tex_index].uri);
}
else
{
mNormalId.setNull();
}
// get metallic-roughness texture
tex_index = material_in.pbrMetallicRoughness.metallicRoughnessTexture.index;
if (tex_index >= 0)
{
mMetallicRoughnessId.set(model.images[tex_index].uri);
}
else
{
mMetallicRoughnessId.setNull();
}
// get emissive texture
tex_index = material_in.emissiveTexture.index;
if (tex_index >= 0)
{
mEmissiveId.set(model.images[tex_index].uri);
}
else
{
mEmissiveId.setNull();
}
setAlphaMode(material_in.alphaMode);
mAlphaCutoff = llclamp((F32)material_in.alphaCutoff, 0.f, 1.f);
mBaseColor.set(material_in.pbrMetallicRoughness.baseColorFactor);
mEmissiveColor.set(material_in.emissiveFactor);
mMetallicFactor = llclamp((F32)material_in.pbrMetallicRoughness.metallicFactor, 0.f, 1.f);
mRoughnessFactor = llclamp((F32)material_in.pbrMetallicRoughness.roughnessFactor, 0.f, 1.f);
mDoubleSided = material_in.doubleSided;
}
void LLGLTFMaterial::writeToModel(tinygltf::Model& model, S32 mat_index) const
{
if (model.materials.size() < mat_index+1)
{
model.materials.resize(mat_index + 1);
}
tinygltf::Material& material_out = model.materials[mat_index];
// set base color texture
if (mBaseColorId.notNull())
{
U32 idx = model.images.size();
model.images.resize(idx + 1);
model.textures.resize(idx + 1);
material_out.pbrMetallicRoughness.baseColorTexture.index = idx;
model.textures[idx].source = idx;
model.images[idx].uri = mBaseColorId.asString();
}
// set normal texture
if (mNormalId.notNull())
{
U32 idx = model.images.size();
model.images.resize(idx + 1);
model.textures.resize(idx + 1);
material_out.normalTexture.index = idx;
model.textures[idx].source = idx;
model.images[idx].uri = mNormalId.asString();
}
// set metallic-roughness texture
if (mMetallicRoughnessId.notNull())
{
U32 idx = model.images.size();
model.images.resize(idx + 1);
model.textures.resize(idx + 1);
material_out.pbrMetallicRoughness.metallicRoughnessTexture.index = idx;
model.textures[idx].source = idx;
model.images[idx].uri = mMetallicRoughnessId.asString();
}
// set emissive texture
if (mEmissiveId.notNull())
{
U32 idx = model.images.size();
model.images.resize(idx + 1);
model.textures.resize(idx + 1);
material_out.emissiveTexture.index = idx;
model.textures[idx].source = idx;
model.images[idx].uri = mEmissiveId.asString();
}
material_out.alphaMode = getAlphaMode();
material_out.alphaCutoff = mAlphaCutoff;
mBaseColor.write(material_out.pbrMetallicRoughness.baseColorFactor);
mEmissiveColor.write(material_out.emissiveFactor);
material_out.pbrMetallicRoughness.metallicFactor = mMetallicFactor;
material_out.pbrMetallicRoughness.roughnessFactor = mRoughnessFactor;
material_out.doubleSided = mDoubleSided;
}
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