2 * Copyright (c) 2019 Samsung Electronics Co., Ltd.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
19 #include "ktx-loader.h"
25 #include <dali/integration-api/debug.h>
26 #include <dali/devel-api/adaptor-framework/file-stream.h>
35 uint32_t glType; //(UNSIGNED_BYTE, UNSIGNED_SHORT_5_6_5, etc.)
37 uint32_t glFormat; //(RGB, RGBA, BGRA, etc.)
38 uint32_t glInternalFormat; //For uncompressed textures, specifies the internalformat parameter passed to glTexStorage*D or glTexImage*D
39 uint32_t glBaseInternalFormat;
43 uint32_t numberOfArrayElements;
44 uint32_t numberOfFaces; //Cube map faces are stored in the order: +X, -X, +Y, -Y, +Z, -Z.
45 uint32_t numberOfMipmapLevels;
46 uint32_t bytesOfKeyValueData;
50 * Convert KTX format to Dali::Pixel::Format
52 bool ConvertPixelFormat(const uint32_t ktxPixelFormat, Dali::Pixel::Format& format)
54 switch( ktxPixelFormat )
56 case 0x93B0: // GL_COMPRESSED_RGBA_ASTC_4x4_KHR
58 format = Dali::Pixel::COMPRESSED_RGBA_ASTC_4x4_KHR;
61 case 0x881B:// GL_RGB16F
63 format = Dali::Pixel::RGB16F;
66 case 0x8815: // GL_RGB32F
68 format = Dali::Pixel::RGB32F;
71 case 0x8C3A: // GL_R11F_G11F_B10F
73 format = Dali::Pixel::RGB32F;
76 case 0x8D7C: // GL_RGBA8UI
78 format = Dali::Pixel::RGBA8888;
81 case 0x8D7D: // GL_RGB8UI
83 format = Dali::Pixel::RGB888;
95 bool LoadCubeMapFromKtxFile( const std::string& path, CubeData& cubedata )
97 std::unique_ptr<FILE, void(*)(FILE*)> fp(fopen(path.c_str(), "rb"), [](FILE* fp) {
108 KtxFileHeader header;
109 int result = fread(&header, sizeof(KtxFileHeader), 1u, fp.get());
115 // Skip the key-values:
116 if (fseek(fp.get(), header.bytesOfKeyValueData, SEEK_CUR))
121 cubedata.img.resize(header.numberOfFaces);
123 for (unsigned int face = 0; face < header.numberOfFaces; ++face) //array_element must be 0 or 1
125 cubedata.img[face].resize(header.numberOfMipmapLevels);
128 if (0 == header.numberOfMipmapLevels)
130 header.numberOfMipmapLevels = 1u;
133 if (0 == header.numberOfArrayElements)
135 header.numberOfArrayElements = 1u;
138 if (0 == header.pixelDepth)
140 header.pixelDepth = 1u;
143 if (0 == header.pixelHeight)
145 header.pixelHeight = 1u;
148 Dali::Pixel::Format daliformat = Pixel::RGB888;
150 ConvertPixelFormat(header.glInternalFormat, daliformat);
152 for (unsigned int mipmapLevel = 0; mipmapLevel < header.numberOfMipmapLevels; ++mipmapLevel)
154 uint32_t byteSize = 0;
155 if (fread(&byteSize, sizeof(byteSize), 1u, fp.get()) != 1)
160 if (0 != byteSize % 4u)
162 byteSize += 4u - byteSize % 4u;
165 for (unsigned int arrayElement = 0; arrayElement < header.numberOfArrayElements; ++arrayElement) // arrayElement must be 0 or 1
167 for (unsigned int face = 0; face < header.numberOfFaces; ++face)
169 std::unique_ptr<uint8_t, void(*)(void*)> img(static_cast<unsigned char*>(malloc(byteSize)), free); // resources will be freed when the PixelData is destroyed.
170 if (fread(img.get(), byteSize, 1u, fp.get()) != 1)
174 cubedata.img[face][mipmapLevel] = PixelData::New(img.release(), byteSize, header.pixelWidth, header.pixelHeight, daliformat, PixelData::FREE);
178 header.pixelHeight /= 2u;
179 header.pixelWidth /= 2u;
185 } // namespace PbrDemo