/*
* Copyright (c) 2022, Jelle Raaijmakers <jelle@gmta.nl>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibGL/Image.h>
namespace GL {
ErrorOr<GPU::PixelType> get_validated_pixel_type(GLenum target, GLenum internal_format, GLenum format, GLenum type)
{
// We accept GL_NONE as target for non-texture related calls (such as `glDrawPixels`)
if (target != GL_NONE
&& target != GL_TEXTURE_1D
&& target != GL_TEXTURE_2D
&& target != GL_TEXTURE_3D
&& target != GL_TEXTURE_1D_ARRAY
&& target != GL_TEXTURE_2D_ARRAY
&& target != GL_TEXTURE_CUBE_MAP
&& target != GL_PROXY_TEXTURE_1D
&& target != GL_PROXY_TEXTURE_2D
&& target != GL_PROXY_TEXTURE_3D)
return Error::from_errno(GL_INVALID_ENUM);
// Internal format can be a number between 1 and 4. Symbolic formats were only added with EXT_texture, promoted to core in OpenGL 1.1
if (internal_format == 1)
internal_format = GL_ALPHA;
else if (internal_format == 2)
internal_format = GL_LUMINANCE_ALPHA;
else if (internal_format == 3)
internal_format = GL_RGB;
else if (internal_format == 4)
internal_format = GL_RGBA;
if (internal_format != GL_NONE
&& internal_format != GL_ALPHA
&& internal_format != GL_ALPHA4
&& internal_format != GL_ALPHA8
&& internal_format != GL_ALPHA12
&& internal_format != GL_ALPHA16
&& internal_format != GL_COMPRESSED_ALPHA
&& internal_format != GL_COMPRESSED_LUMINANCE
&& internal_format != GL_COMPRESSED_LUMINANCE_ALPHA
&& internal_format != GL_COMPRESSED_INTENSITY
&& internal_format != GL_COMPRESSED_RGB
&& internal_format != GL_COMPRESSED_RGBA
&& internal_format != GL_DEPTH_COMPONENT
&& internal_format != GL_DEPTH_COMPONENT16
&& internal_format != GL_DEPTH_COMPONENT24
&& internal_format != GL_DEPTH_COMPONENT32
&& internal_format != GL_DEPTH_STENCIL
&& internal_format != GL_LUMINANCE
&& internal_format != GL_LUMINANCE4
&& internal_format != GL_LUMINANCE8
&& internal_format != GL_LUMINANCE12
&& internal_format != GL_LUMINANCE16
&& internal_format != GL_LUMINANCE_ALPHA
&& internal_format != GL_LUMINANCE4_ALPHA4
&& internal_format != GL_LUMINANCE6_ALPHA2
&& internal_format != GL_LUMINANCE8_ALPHA8
&& internal_format != GL_LUMINANCE12_ALPHA4
&& internal_format != GL_LUMINANCE12_ALPHA12
&& internal_format != GL_LUMINANCE16_ALPHA16
&& internal_format != GL_INTENSITY
&& internal_format != GL_INTENSITY4
&& internal_format != GL_INTENSITY8
&& internal_format != GL_INTENSITY12
&& internal_format != GL_INTENSITY16
&& internal_format != GL_R3_G3_B2
&& internal_format != GL_RED
&& internal_format != GL_RG
&& internal_format != GL_RGB
&& internal_format != GL_RGB4
&& internal_format != GL_RGB5
&& internal_format != GL_RGB8
&& internal_format != GL_RGB10
&& internal_format != GL_RGB12
&& internal_format != GL_RGB16
&& internal_format != GL_RGBA
&& internal_format != GL_RGBA2
&& internal_format != GL_RGBA4
&& internal_format != GL_RGB5_A1
&& internal_format != GL_RGBA8
&& internal_format != GL_RGB10_A2
&& internal_format != GL_RGBA12
&& internal_format != GL_RGBA16
&& internal_format != GL_SLUMINANCE
&& internal_format != GL_SLUMINANCE8
&& internal_format != GL_SLUMINANCE_ALPHA
&& internal_format != GL_SLUMINANCE8_ALPHA8
&& internal_format != GL_SRGB
&& internal_format != GL_SRGB8
&& internal_format != GL_SRGB_ALPHA
&& internal_format != GL_SRGB8_ALPHA8)
return Error::from_errno(GL_INVALID_ENUM);
if (format != GL_NONE
&& (format < GL_COLOR_INDEX || format > GL_LUMINANCE_ALPHA)
&& format != GL_BGR
&& format != GL_BGRA)
return Error::from_errno(GL_INVALID_ENUM);
if (type != GL_NONE
&& type != GL_BITMAP
&& (type < GL_BYTE || type > GL_FLOAT)
&& type != GL_HALF_FLOAT
&& (type < GL_UNSIGNED_BYTE_3_3_2 || type > GL_UNSIGNED_INT_10_10_10_2)
&& (type < GL_UNSIGNED_BYTE_2_3_3_REV || type > GL_UNSIGNED_INT_2_10_10_10_REV))
return Error::from_errno(GL_INVALID_ENUM);
if (type == GL_BITMAP && format != GL_COLOR_INDEX && format != GL_STENCIL_INDEX)
return Error::from_errno(GL_INVALID_ENUM);
if (format != GL_RGB && (type == GL_UNSIGNED_BYTE_3_3_2 || type == GL_UNSIGNED_BYTE_2_3_3_REV || type == GL_UNSIGNED_SHORT_5_6_5 || type == GL_UNSIGNED_SHORT_5_6_5_REV))
return Error::from_errno(GL_INVALID_OPERATION);
if ((type == GL_UNSIGNED_SHORT_4_4_4_4
|| type == GL_UNSIGNED_SHORT_4_4_4_4_REV
|| type == GL_UNSIGNED_SHORT_5_5_5_1
|| type == GL_UNSIGNED_SHORT_1_5_5_5_REV
|| type == GL_UNSIGNED_INT_8_8_8_8
|| type == GL_UNSIGNED_INT_8_8_8_8_REV
|| type == GL_UNSIGNED_INT_10_10_10_2
|| type == GL_UNSIGNED_INT_2_10_10_10_REV)
&& format != GL_RGBA
&& format != GL_BGRA)
return Error::from_errno(GL_INVALID_OPERATION);
if (internal_format != GL_NONE) {
auto const internal_format_is_depth = internal_format == GL_DEPTH_COMPONENT
|| internal_format == GL_DEPTH_COMPONENT16
|| internal_format == GL_DEPTH_COMPONENT24
|| internal_format == GL_DEPTH_COMPONENT32;
if ((target != GL_TEXTURE_2D && target != GL_PROXY_TEXTURE_2D && internal_format_is_depth)
|| (format == GL_DEPTH_COMPONENT && !internal_format_is_depth)
|| (format != GL_DEPTH_COMPONENT && internal_format_is_depth))
return Error::from_errno(GL_INVALID_OPERATION);
}
return get_format_specification(format, type);
}
GPU::PixelType get_format_specification(GLenum format, GLenum type)
{
auto get_format = [](GLenum format) -> GPU::PixelFormat {
switch (format) {
case GL_ALPHA:
return GPU::PixelFormat::Alpha;
case GL_BGR:
return GPU::PixelFormat::BGR;
case GL_BGRA:
return GPU::PixelFormat::BGRA;
case GL_BLUE:
return GPU::PixelFormat::Blue;
case GL_COLOR_INDEX:
return GPU::PixelFormat::ColorIndex;
case GL_DEPTH_COMPONENT:
return GPU::PixelFormat::DepthComponent;
case GL_GREEN:
return GPU::PixelFormat::Green;
case GL_LUMINANCE:
return GPU::PixelFormat::Luminance;
case GL_LUMINANCE_ALPHA:
return GPU::PixelFormat::LuminanceAlpha;
case GL_RED:
return GPU::PixelFormat::Red;
case GL_RGB:
return GPU::PixelFormat::RGB;
case GL_RGBA:
return GPU::PixelFormat::RGBA;
case GL_STENCIL_INDEX:
return GPU::PixelFormat::StencilIndex;
}
VERIFY_NOT_REACHED();
};
auto pixel_format = get_format(format);
switch (type) {
case GL_BITMAP:
return { pixel_format, GPU::PixelComponentBits::AllBits, GPU::PixelDataType::Bitmap, GPU::ComponentsOrder::Normal };
case GL_BYTE:
return { pixel_format, GPU::PixelComponentBits::AllBits, GPU::PixelDataType::Byte, GPU::ComponentsOrder::Normal };
case GL_FLOAT:
return { pixel_format, GPU::PixelComponentBits::AllBits, GPU::PixelDataType::Float, GPU::ComponentsOrder::Normal };
case GL_HALF_FLOAT:
return { pixel_format, GPU::PixelComponentBits::AllBits, GPU::PixelDataType::HalfFloat, GPU::ComponentsOrder::Normal };
case GL_INT:
return { pixel_format, GPU::PixelComponentBits::AllBits, GPU::PixelDataType::Int, GPU::ComponentsOrder::Normal };
case GL_SHORT:
return { pixel_format, GPU::PixelComponentBits::AllBits, GPU::PixelDataType::Short, GPU::ComponentsOrder::Normal };
case GL_UNSIGNED_BYTE:
return { pixel_format, GPU::PixelComponentBits::AllBits, GPU::PixelDataType::UnsignedByte, GPU::ComponentsOrder::Normal };
case GL_UNSIGNED_BYTE_2_3_3_REV:
return { pixel_format, GPU::PixelComponentBits::B2_3_3, GPU::PixelDataType::UnsignedByte, GPU::ComponentsOrder::Reversed };
case GL_UNSIGNED_BYTE_3_3_2:
return { pixel_format, GPU::PixelComponentBits::B3_3_2, GPU::PixelDataType::UnsignedByte, GPU::ComponentsOrder::Normal };
case GL_UNSIGNED_INT:
return { pixel_format, GPU::PixelComponentBits::AllBits, GPU::PixelDataType::UnsignedInt, GPU::ComponentsOrder::Normal };
case GL_UNSIGNED_INT_2_10_10_10_REV:
return { pixel_format, GPU::PixelComponentBits::B2_10_10_10, GPU::PixelDataType::UnsignedInt, GPU::ComponentsOrder::Reversed };
case GL_UNSIGNED_INT_8_8_8_8:
return { pixel_format, GPU::PixelComponentBits::B8_8_8_8, GPU::PixelDataType::UnsignedInt, GPU::ComponentsOrder::Normal };
case GL_UNSIGNED_INT_8_8_8_8_REV:
return { pixel_format, GPU::PixelComponentBits::B8_8_8_8, GPU::PixelDataType::UnsignedInt, GPU::ComponentsOrder::Reversed };
case GL_UNSIGNED_INT_10_10_10_2:
return { pixel_format, GPU::PixelComponentBits::B10_10_10_2, GPU::PixelDataType::UnsignedInt, GPU::ComponentsOrder::Normal };
case GL_UNSIGNED_SHORT:
return { pixel_format, GPU::PixelComponentBits::AllBits, GPU::PixelDataType::UnsignedShort, GPU::ComponentsOrder::Normal };
case GL_UNSIGNED_SHORT_1_5_5_5_REV:
return { pixel_format, GPU::PixelComponentBits::B1_5_5_5, GPU::PixelDataType::UnsignedShort, GPU::ComponentsOrder::Reversed };
case GL_UNSIGNED_SHORT_4_4_4_4:
return { pixel_format, GPU::PixelComponentBits::B4_4_4_4, GPU::PixelDataType::UnsignedShort, GPU::ComponentsOrder::Normal };
case GL_UNSIGNED_SHORT_4_4_4_4_REV:
return { pixel_format, GPU::PixelComponentBits::B4_4_4_4, GPU::PixelDataType::UnsignedShort, GPU::ComponentsOrder::Reversed };
case GL_UNSIGNED_SHORT_5_6_5:
return { pixel_format, GPU::PixelComponentBits::B5_6_5, GPU::PixelDataType::UnsignedShort, GPU::ComponentsOrder::Normal };
case GL_UNSIGNED_SHORT_5_6_5_REV:
return { pixel_format, GPU::PixelComponentBits::B5_6_5, GPU::PixelDataType::UnsignedShort, GPU::ComponentsOrder::Reversed };
case GL_UNSIGNED_SHORT_5_5_5_1:
return { pixel_format, GPU::PixelComponentBits::B5_5_5_1, GPU::PixelDataType::UnsignedShort, GPU::ComponentsOrder::Normal };
}
VERIFY_NOT_REACHED();
}
GPU::PixelFormat pixel_format_for_internal_format(GLenum internal_format)
{
// FIXME: add support for all the SRGB formats
// Numbers 1-4 are supported deprecated values
switch (internal_format) {
case 1:
case GL_ALPHA:
case GL_ALPHA4:
case GL_ALPHA8:
case GL_ALPHA12:
case GL_ALPHA16:
case GL_COMPRESSED_ALPHA:
return GPU::PixelFormat::Alpha;
case GL_DEPTH_COMPONENT:
case GL_DEPTH_COMPONENT16:
case GL_DEPTH_COMPONENT24:
case GL_DEPTH_COMPONENT32:
return GPU::PixelFormat::DepthComponent;
case GL_INTENSITY:
case GL_INTENSITY4:
case GL_INTENSITY8:
case GL_INTENSITY12:
case GL_INTENSITY16:
case GL_COMPRESSED_INTENSITY:
return GPU::PixelFormat::Intensity;
case GL_LUMINANCE:
case GL_LUMINANCE4:
case GL_LUMINANCE8:
case GL_LUMINANCE12:
case GL_LUMINANCE16:
case GL_COMPRESSED_LUMINANCE:
return GPU::PixelFormat::Luminance;
case 2:
case GL_LUMINANCE_ALPHA:
case GL_LUMINANCE4_ALPHA4:
case GL_LUMINANCE6_ALPHA2:
case GL_LUMINANCE8_ALPHA8:
case GL_LUMINANCE12_ALPHA4:
case GL_LUMINANCE12_ALPHA12:
case GL_LUMINANCE16_ALPHA16:
return GPU::PixelFormat::LuminanceAlpha;
case 3:
case GL_RGB:
case GL_R3_G3_B2:
case GL_RGB4:
case GL_RGB5:
case GL_RGB8:
case GL_RGB10:
case GL_RGB12:
case GL_RGB16:
case GL_COMPRESSED_RGB:
return GPU::PixelFormat::RGB;
case 4:
case GL_RGBA:
case GL_RGBA2:
case GL_RGBA4:
case GL_RGBA8:
case GL_RGB10_A2:
case GL_RGBA12:
case GL_RGBA16:
case GL_COMPRESSED_RGBA:
return GPU::PixelFormat::RGBA;
}
VERIFY_NOT_REACHED();
}
}