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MobileGL/MobileGL/MG_Util/Texture/TextureFormatProcessor.cpp
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// MobileGL - MobileGL/MG_Util/Texture/TextureFormatProcessor.cpp
// Copyright (c) 2025-2026 MobileGL-Dev
// Licensed under the GNU Lesser General Public License v3.0:
// https://www.gnu.org/licenses/gpl-3.0.txt
// https://www.gnu.org/licenses/lgpl-3.0.txt
// SPDX-License-Identifier: LGPL-3.0-only
// End of Source File Header
#include "TextureFormatProcessor.h"
#include "MG_Util/Converters/GLToStr/GLEnumConverter.h"
namespace MobileGL::MG_Util::TextureFormatProcessor {
void NormalizePixelFormat(GLenum internalFormat, Flags<PixelFormatNormalizeOptionBit> options,
GLenum* outInternalFormat, GLenum* outFormat, GLenum* outType) {
#ifdef TRACY_ENABLE
ZoneScopedC(TRACY_ZONECOLOR_BACKEND);
#endif
// internal format
if (outInternalFormat) {
switch (internalFormat) {
case GL_DEPTH_COMPONENT32:
*outInternalFormat = GL_DEPTH_COMPONENT;
break;
case GL_RGBA16:
if (options & PixelFormatNormalizeOptionBit::NoNorm16) {
*outInternalFormat = GL_RGBA32F;
break;
}
case GL_RGB16:
if (options & PixelFormatNormalizeOptionBit::NoNorm16) {
*outInternalFormat = GL_RGB32F;
break;
}
case GL_RG16:
if (options & PixelFormatNormalizeOptionBit::NoNorm16) {
*outInternalFormat = GL_RG32F;
break;
}
case GL_R16:
if (options & PixelFormatNormalizeOptionBit::NoNorm16) {
*outInternalFormat = GL_R32F;
break;
}
default:
*outInternalFormat = internalFormat;
break;
}
}
// format
if (outFormat) {
switch (internalFormat) {
// Color Unsigned Normalized
case GL_RGBA:
case GL_RGBA16:
case GL_RGBA8:
*outFormat = GL_RGBA;
break;
case GL_RGB:
case GL_RGB16:
case GL_RGB8:
*outFormat = GL_RGB;
break;
case GL_RG:
case GL_RG16:
case GL_RG8:
*outFormat = GL_RG;
break;
case GL_RED:
case GL_R16:
case GL_R8:
*outFormat = GL_RED;
break;
// Color Signed Normalized
case GL_RGBA_SNORM:
case GL_RGBA16_SNORM:
case GL_RGBA8_SNORM:
*outFormat = GL_RGBA;
break;
case GL_RGB_SNORM:
case GL_RGB16_SNORM:
case GL_RGB8_SNORM:
*outFormat = GL_RGB;
break;
case GL_RG_SNORM:
case GL_RG16_SNORM:
case GL_RG8_SNORM:
*outFormat = GL_RG;
break;
case GL_RED_SNORM:
case GL_R16_SNORM:
case GL_R8_SNORM:
*outFormat = GL_RED;
break;
// Color Integer
case GL_RGBA32UI:
case GL_RGBA16UI:
case GL_RGBA8UI:
case GL_RGBA32I:
case GL_RGBA16I:
case GL_RGBA8I:
*outFormat = GL_RGBA_INTEGER;
break;
case GL_RGB32UI:
case GL_RGB16UI:
case GL_RGB8UI:
case GL_RGB32I:
case GL_RGB16I:
case GL_RGB8I:
*outFormat = GL_RGB_INTEGER;
break;
case GL_RG32UI:
case GL_RG16UI:
case GL_RG8UI:
case GL_RG32I:
case GL_RG16I:
case GL_RG8I:
*outFormat = GL_RG_INTEGER;
break;
case GL_R32UI:
case GL_R16UI:
case GL_R8UI:
case GL_R32I:
case GL_R16I:
case GL_R8I:
*outFormat = GL_RED_INTEGER;
break;
// Color Float
case GL_RGBA32F:
case GL_RGBA16F:
*outFormat = GL_RGBA;
break;
case GL_RGB32F:
case GL_RGB16F:
*outFormat = GL_RGB;
break;
case GL_RG32F:
case GL_RG16F:
*outFormat = GL_RG;
break;
case GL_R32F:
case GL_R16F:
*outFormat = GL_RED;
break;
// Color sRGB
case GL_SRGB:
case GL_SRGB8:
*outFormat = GL_RGB;
break;
case GL_SRGB8_ALPHA8:
*outFormat = GL_RGBA;
break;
// Color sized other
case GL_RGB9_E5:
case GL_R11F_G11F_B10F:
*outFormat = GL_RGB;
break;
case GL_RGB10_A2:
case GL_RGB5_A1:
*outFormat = GL_RGBA;
break;
// Depth
case GL_DEPTH_COMPONENT16:
case GL_DEPTH_COMPONENT24:
case GL_DEPTH_COMPONENT32:
case GL_DEPTH_COMPONENT32F:
case GL_DEPTH_COMPONENT:
*outFormat = GL_DEPTH_COMPONENT;
break;
// Depth Stencil
case GL_DEPTH24_STENCIL8:
case GL_DEPTH32F_STENCIL8:
case GL_DEPTH_STENCIL:
*outFormat = GL_DEPTH_STENCIL;
break;
default:
MGLOG_E("NormalizePixelFormat: outFormat: unhandled internalFormat: %s",
MG_Util::ConvertGLEnumToString(internalFormat).c_str());
// Fallback handling for other formats
// Try to infer format from internal format name
if (strstr(MG_Util::ConvertGLEnumToString(internalFormat).c_str(), "RGBA") != nullptr) {
*outFormat = GL_RGBA;
} else if (strstr(MG_Util::ConvertGLEnumToString(internalFormat).c_str(), "RGB") != nullptr) {
*outFormat = GL_RGB;
} else if (strstr(MG_Util::ConvertGLEnumToString(internalFormat).c_str(), "RG") != nullptr) {
*outFormat = GL_RG;
} else if (strstr(MG_Util::ConvertGLEnumToString(internalFormat).c_str(), "RED") != nullptr) {
*outFormat = GL_RED;
} else {
*outFormat = GL_RGBA; // Ultimate fallback
}
break;
}
}
// type
if (outType) {
switch (internalFormat) {
// Color Unsigned Normalized
case GL_RGBA16:
case GL_RGB16:
case GL_RG16:
case GL_R16:
if (options & PixelFormatNormalizeOptionBit::NoNorm16) {
// converted to GL_RGBA32F
*outType = GL_FLOAT;
break;
} else {
*outType = GL_UNSIGNED_SHORT;
break;
}
case GL_RGBA8:
case GL_RGB8:
case GL_RG8:
case GL_R8:
*outType = GL_UNSIGNED_BYTE;
break;
// Color Signed Normalized
case GL_RGBA16_SNORM:
case GL_RGB16_SNORM:
case GL_RG16_SNORM:
case GL_R16_SNORM:
*outType = GL_SHORT;
break;
case GL_RGBA8_SNORM:
case GL_RGB8_SNORM:
case GL_RG8_SNORM:
case GL_R8_SNORM:
*outType = GL_BYTE;
break;
// Color Unsigned Integer
case GL_RGBA32UI:
case GL_RGB32UI:
case GL_RG32UI:
case GL_R32UI:
*outType = GL_UNSIGNED_INT;
break;
case GL_RGBA16UI:
case GL_RGB16UI:
case GL_RG16UI:
case GL_R16UI:
*outType = GL_UNSIGNED_SHORT;
break;
case GL_RGBA8UI:
case GL_RGB8UI:
case GL_RG8UI:
case GL_R8UI:
*outType = GL_UNSIGNED_BYTE;
break;
// Color Integer
case GL_RGBA32I:
case GL_RGB32I:
case GL_RG32I:
case GL_R32I:
*outType = GL_INT;
break;
case GL_RGBA16I:
case GL_RGB16I:
case GL_RG16I:
case GL_R16I:
*outType = GL_SHORT;
break;
case GL_RGBA8I:
case GL_RGB8I:
case GL_RG8I:
case GL_R8I:
*outType = GL_BYTE;
break;
// Color Float
case GL_RGBA32F:
case GL_RGB32F:
case GL_RG32F:
case GL_R32F:
*outType = GL_FLOAT;
break;
case GL_RGBA16F:
case GL_RGB16F:
case GL_RG16F:
case GL_R16F:
*outType = GL_HALF_FLOAT;
break;
// Color sRGB
case GL_SRGB8:
*outType = GL_UNSIGNED_BYTE;
break;
case GL_SRGB8_ALPHA8:
*outType = GL_UNSIGNED_BYTE;
break;
// Color sized other
case GL_RGB9_E5:
*outType = GL_UNSIGNED_INT_5_9_9_9_REV;
break;
case GL_R11F_G11F_B10F:
*outType = GL_UNSIGNED_INT_10F_11F_11F_REV;
break;
case GL_RGB10_A2:
*outType = GL_UNSIGNED_INT_2_10_10_10_REV;
break;
case GL_RGB5_A1:
*outType = GL_UNSIGNED_SHORT_5_5_5_1;
break;
// Depth
case GL_DEPTH_COMPONENT16:
*outType = GL_UNSIGNED_SHORT;
break;
case GL_DEPTH_COMPONENT24:
*outType = GL_UNSIGNED_INT;
break;
case GL_DEPTH_COMPONENT32:
*outType = GL_UNSIGNED_INT;
break;
case GL_DEPTH_COMPONENT32F:
*outType = GL_FLOAT;
break;
case GL_DEPTH_COMPONENT:
*outType = GL_UNSIGNED_INT;
break;
// Depth Stencil
case GL_DEPTH24_STENCIL8:
*outType = GL_UNSIGNED_INT_24_8;
break;
case GL_DEPTH32F_STENCIL8:
case GL_DEPTH_STENCIL:
*outType = GL_FLOAT_32_UNSIGNED_INT_24_8_REV;
break;
default:
MGLOG_E("NormalizePixelFormat: outType: unhandled internalFormat: %s",
MG_Util::ConvertGLEnumToString(internalFormat).c_str());
// Fallback handling for other formats
*outType = GL_UNSIGNED_BYTE;
break;
}
}
}
} // namespace MobileGL::MG_Util::TextureFormatProcessor
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