2 * Copyright (c) 2024 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 <dali-scene3d/public-api/loader/ktx-loader.h>
22 #include <dali/integration-api/pixel-data-integ.h>
23 #include <dali/public-api/rendering/texture.h>
31 // http://github.khronos.org/KTX-Specification/
32 const uint8_t KTX_ID_HEAD[] = {0xAB, 0x4B, 0x54, 0x58, 0x20};
33 const uint8_t KTX_ID_TAIL[] = {0xBB, 0x0D, 0x0A, 0x1A, 0x0A};
35 const uint8_t KTX_VERSION_1_1[] = {0x31, 0x31};
36 const uint8_t KTX_VERSION_2_0[] = {0x32, 0x30};
38 static_assert(sizeof(KTX_ID_HEAD) + sizeof(KTX_ID_TAIL) == 10);
39 static_assert(sizeof(KTX_VERSION_1_1) == 2);
40 static_assert(sizeof(KTX_VERSION_2_0) == sizeof(KTX_VERSION_1_1));
42 void FreeBuffer(uint8_t* buffer)
54 uint8_t identifier[12];
56 uint32_t glType; //(UNSIGNED_BYTE, UNSIGNED_SHORT_5_6_5, etc.)
58 uint32_t glFormat; //(RGB, RGBA, BGRA, etc.)
59 uint32_t glInternalFormat; //For uncompressed textures, specifies the internalformat parameter passed to glTexStorage*D or glTexImage*D
60 uint32_t glBaseInternalFormat;
64 uint32_t numberOfArrayElements;
65 uint32_t numberOfFaces; //Cube map faces are stored in the order: +X, -X, +Y, -Y, +Z, -Z.
66 uint32_t numberOfMipmapLevels;
67 uint32_t bytesOfKeyValueData;
69 bool IsIdentifierValid() const
71 return std::equal(KTX_ID_HEAD, std::end(KTX_ID_HEAD), identifier) &&
72 (std::equal(KTX_VERSION_1_1, std::end(KTX_VERSION_1_1), identifier + sizeof(KTX_ID_HEAD)) ||
73 std::equal(KTX_VERSION_2_0, std::end(KTX_VERSION_2_0), identifier + sizeof(KTX_ID_HEAD))) &&
74 std::equal(KTX_ID_TAIL, std::end(KTX_ID_TAIL), identifier + (sizeof(KTX_ID_HEAD) + sizeof(KTX_VERSION_1_1)));
79 * Convert KTX format to Pixel::Format
81 bool ConvertPixelFormat(const uint32_t ktxPixelFormat, Pixel::Format& format)
83 switch(ktxPixelFormat)
85 case 0x93B0: // GL_COMPRESSED_RGBA_ASTC_4x4
87 format = Pixel::COMPRESSED_RGBA_ASTC_4x4_KHR;
90 case 0x93B1: // GL_COMPRESSED_RGBA_ASTC_5x4
92 format = Pixel::COMPRESSED_RGBA_ASTC_5x4_KHR;
95 case 0x93B2: // GL_COMPRESSED_RGBA_ASTC_5x5
97 format = Pixel::COMPRESSED_RGBA_ASTC_5x5_KHR;
100 case 0x93B3: // GL_COMPRESSED_RGBA_ASTC_6x5
102 format = Pixel::COMPRESSED_RGBA_ASTC_6x5_KHR;
105 case 0x93B4: // GL_COMPRESSED_RGBA_ASTC_6x6
107 format = Pixel::COMPRESSED_RGBA_ASTC_6x6_KHR;
110 case 0x93B5: // GL_COMPRESSED_RGBA_ASTC_8x5
112 format = Pixel::COMPRESSED_RGBA_ASTC_8x5_KHR;
115 case 0x93B6: // GL_COMPRESSED_RGBA_ASTC_8x6
117 format = Pixel::COMPRESSED_RGBA_ASTC_8x6_KHR;
120 case 0x93B7: // GL_COMPRESSED_RGBA_ASTC_8x8
122 format = Pixel::COMPRESSED_RGBA_ASTC_8x8_KHR;
125 case 0x93B8: // GL_COMPRESSED_RGBA_ASTC_10x5
127 format = Pixel::COMPRESSED_RGBA_ASTC_10x5_KHR;
130 case 0x93B9: // GL_COMPRESSED_RGBA_ASTC_10x6
132 format = Pixel::COMPRESSED_RGBA_ASTC_10x6_KHR;
135 case 0x93BA: // GL_COMPRESSED_RGBA_ASTC_10x8
137 format = Pixel::COMPRESSED_RGBA_ASTC_10x8_KHR;
140 case 0x93BB: // GL_COMPRESSED_RGBA_ASTC_10x10
142 format = Pixel::COMPRESSED_RGBA_ASTC_10x10_KHR;
145 case 0x93BC: // GL_COMPRESSED_RGBA_ASTC_12x10
147 format = Pixel::COMPRESSED_RGBA_ASTC_12x10_KHR;
150 case 0x93BD: // GL_COMPRESSED_RGBA_ASTC_12x12
152 format = Pixel::COMPRESSED_RGBA_ASTC_12x12_KHR;
155 case 0x881B: // GL_RGB16F
157 format = Pixel::RGB16F;
160 case 0x8815: // GL_RGB32F
162 format = Pixel::RGB32F;
165 case 0x8C3A: // GL_R11F_G11F_B10F
167 format = Pixel::R11G11B10F;
170 case 0x8D7C: // GL_RGBA8UI
172 format = Pixel::RGBA8888;
175 case 0x8D7D: // GL_RGB8UI
177 format = Pixel::RGB888;
189 bool LoadKtxData(const std::string& path, EnvironmentMapData& environmentMapData)
191 std::fstream fp(path, std::ios::in | std::ios::binary);
192 if(fp.is_open() == false)
197 KtxFileHeader header;
198 if(fp.read(reinterpret_cast<char*>(&header), sizeof(KtxFileHeader)).good() == false)
203 if(!header.IsIdentifierValid())
208 // Skip the key-values:
209 if(fp.seekg(static_cast<std::streamoff>(static_cast<std::size_t>(header.bytesOfKeyValueData)), fp.cur).good() == false)
214 header.numberOfMipmapLevels = std::max(header.numberOfMipmapLevels, 1u);
215 header.numberOfArrayElements = std::max(header.numberOfArrayElements, 1u);
216 header.pixelDepth = std::max(header.pixelDepth, 1u);
217 header.pixelHeight = std::max(header.pixelHeight, 1u);
218 environmentMapData.SetMipmapLevels(header.numberOfMipmapLevels);
220 environmentMapData.mPixelData.resize(header.numberOfFaces);
221 for(uint32_t face = 0u; face < header.numberOfFaces; ++face)
223 environmentMapData.mPixelData[face].resize(header.numberOfMipmapLevels);
226 Pixel::Format daliformat = Pixel::RGB888;
228 ConvertPixelFormat(header.glInternalFormat, daliformat);
230 for(uint32_t mipmapLevel = 0u; mipmapLevel < header.numberOfMipmapLevels; ++mipmapLevel)
232 uint32_t byteSize = 0u;
233 if(fp.read(reinterpret_cast<char*>(&byteSize), sizeof(byteSize)).good() == false)
238 if(0u != byteSize % 4u)
240 byteSize += 4u - byteSize % 4u;
243 for(uint32_t arrayElement = 0u; arrayElement < header.numberOfArrayElements; ++arrayElement) //arrayElement must be 0 or 1
245 for(uint32_t face = 0u; face < header.numberOfFaces; ++face)
247 std::unique_ptr<uint8_t, void (*)(uint8_t*)> img(new uint8_t[byteSize], FreeBuffer);
248 if(fp.read(reinterpret_cast<char*>(img.get()), static_cast<std::streamsize>(static_cast<size_t>(byteSize))).good() == false)
252 environmentMapData.mPixelData[face][mipmapLevel] = Dali::Integration::NewPixelDataWithReleaseAfterUpload(img.release(), byteSize, header.pixelWidth, header.pixelHeight, 0u, daliformat, PixelData::DELETE_ARRAY);
256 header.pixelHeight /= 2u;
257 header.pixelWidth /= 2u;
259 environmentMapData.SetEnvironmentMapType(Scene3D::EnvironmentMapType::CUBEMAP);
264 } // namespace Loader
265 } // namespace Scene3D