ktx-loader.cpp
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/*
* Copyright (c) 2019 Samsung Electronics Co., Ltd.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
// FILE HEADER
#include "ktx-loader.h"
// EXTERNAL INCLUDES
#include <memory.h>
#include <stdio.h>
#include <stdint.h>
#include <dali/integration-api/debug.h>
#include <dali/devel-api/adaptor-framework/file-stream.h>
namespace PbrDemo
{
struct KtxFileHeader
{
char identifier[12];
uint32_t endianness;
uint32_t glType; //(UNSIGNED_BYTE, UNSIGNED_SHORT_5_6_5, etc.)
uint32_t glTypeSize;
uint32_t glFormat; //(RGB, RGBA, BGRA, etc.)
uint32_t glInternalFormat; //For uncompressed textures, specifies the internalformat parameter passed to glTexStorage*D or glTexImage*D
uint32_t glBaseInternalFormat;
uint32_t pixelWidth;
uint32_t pixelHeight;
uint32_t pixelDepth;
uint32_t numberOfArrayElements;
uint32_t numberOfFaces; //Cube map faces are stored in the order: +X, -X, +Y, -Y, +Z, -Z.
uint32_t numberOfMipmapLevels;
uint32_t bytesOfKeyValueData;
};
/**
* Convert KTX format to Dali::Pixel::Format
*/
bool ConvertPixelFormat(const uint32_t ktxPixelFormat, Dali::Pixel::Format& format)
{
switch( ktxPixelFormat )
{
case 0x93B0: // GL_COMPRESSED_RGBA_ASTC_4x4_KHR
{
format = Dali::Pixel::COMPRESSED_RGBA_ASTC_4x4_KHR;
break;
}
case 0x881B:// GL_RGB16F
{
format = Dali::Pixel::RGB16F;
break;
}
case 0x8815: // GL_RGB32F
{
format = Dali::Pixel::RGB32F;
break;
}
case 0x8C3A: // GL_R11F_G11F_B10F
{
format = Dali::Pixel::RGB32F;
break;
}
case 0x8D7C: // GL_RGBA8UI
{
format = Dali::Pixel::RGBA8888;
break;
}
case 0x8D7D: // GL_RGB8UI
{
format = Dali::Pixel::RGB888;
break;
}
default:
{
return false;
}
}
return true;
}
bool LoadCubeMapFromKtxFile( const std::string& path, CubeData& cubedata )
{
std::unique_ptr<FILE, void(*)(FILE*)> fp(fopen(path.c_str(), "rb"), [](FILE* fp) {
if (fp)
{
fclose(fp);
}
});
if (!fp)
{
return false;
}
KtxFileHeader header;
int result = fread(&header, sizeof(KtxFileHeader), 1u, fp.get());
if (0 == result)
{
return false;
}
// Skip the key-values:
if (fseek(fp.get(), header.bytesOfKeyValueData, SEEK_CUR))
{
return false;
}
cubedata.img.resize(header.numberOfFaces);
for (unsigned int face = 0; face < header.numberOfFaces; ++face) //array_element must be 0 or 1
{
cubedata.img[face].resize(header.numberOfMipmapLevels);
}
if (0 == header.numberOfMipmapLevels)
{
header.numberOfMipmapLevels = 1u;
}
if (0 == header.numberOfArrayElements)
{
header.numberOfArrayElements = 1u;
}
if (0 == header.pixelDepth)
{
header.pixelDepth = 1u;
}
if (0 == header.pixelHeight)
{
header.pixelHeight = 1u;
}
Dali::Pixel::Format daliformat = Pixel::RGB888;
ConvertPixelFormat(header.glInternalFormat, daliformat);
for (unsigned int mipmapLevel = 0; mipmapLevel < header.numberOfMipmapLevels; ++mipmapLevel)
{
uint32_t byteSize = 0;
if (fread(&byteSize, sizeof(byteSize), 1u, fp.get()) != 1)
{
return false;
}
if (0 != byteSize % 4u)
{
byteSize += 4u - byteSize % 4u;
}
for (unsigned int arrayElement = 0; arrayElement < header.numberOfArrayElements; ++arrayElement) // arrayElement must be 0 or 1
{
for (unsigned int face = 0; face < header.numberOfFaces; ++face)
{
std::unique_ptr<uint8_t, void(*)(void*)> img(static_cast<unsigned char*>(malloc(byteSize)), free); // resources will be freed when the PixelData is destroyed.
if (fread(img.get(), byteSize, 1u, fp.get()) != 1)
{
return false;
}
cubedata.img[face][mipmapLevel] = PixelData::New(img.release(), byteSize, header.pixelWidth, header.pixelHeight, daliformat, PixelData::FREE);
}
}
header.pixelHeight /= 2u;
header.pixelWidth /= 2u;
}
return true;
}
} // namespace PbrDemo