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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();
}
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;
}
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