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/*
* Copyright (c) 2021, Jesse Buhagiar <jooster669@gmail.com>
* Copyright (c) 2021, Stephan Unverwerth <s.unverwerth@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibGL/GL/gl.h>
#include <LibGL/Tex/Texture2D.h>
namespace GL {
void Texture2D::upload_texture_data(GLuint lod, GLint internal_format, GLsizei width, GLsizei height, GLenum format, GLenum type, GLvoid const* pixels, GLsizei pixels_per_row, u8 byte_alignment)
{
// NOTE: Some target, format, and internal formats are currently unsupported.
// Considering we control this library, and `gl.h` itself, we don't need to add any
// checks here to see if we support them; the program will simply fail to compile..
auto& mip = m_mipmaps[lod];
mip.set_width(width);
mip.set_height(height);
m_internal_format = internal_format;
// No pixel data was supplied; leave the texture memory uninitialized.
if (pixels == nullptr)
return;
replace_sub_texture_data(lod, 0, 0, width, height, format, type, pixels, pixels_per_row, byte_alignment);
}
void Texture2D::replace_sub_texture_data(GLuint lod, GLint xoffset, GLint yoffset, GLsizei width, GLsizei height, GLenum format, GLenum type, GLvoid const* pixels, GLsizei pixels_per_row, u8 byte_alignment)
{
auto& mip = m_mipmaps[lod];
// FIXME: We currently only support GL_UNSIGNED_BYTE and GL_UNSIGNED_SHORT_5_6_5 pixel data
VERIFY(type == GL_UNSIGNED_BYTE || type == GL_UNSIGNED_SHORT_5_6_5);
VERIFY(xoffset >= 0 && yoffset >= 0 && xoffset + width <= mip.width() && yoffset + height <= mip.height());
VERIFY(pixels_per_row == 0 || pixels_per_row >= xoffset + width);
// FIXME: We currently depend on the first glTexImage2D call to attach an image to mipmap level 0, which initializes the GPU image
// Ideally we would create separate GPU images for each level and merge them into a final image
// once used for rendering for the first time.
if (device_image().is_null())
return;
u8 pixel_size_bytes;
switch (type) {
case GL_UNSIGNED_BYTE:
pixel_size_bytes = (format == GL_RGBA || format == GL_BGRA) ? 4 : 3;
break;
case GL_UNSIGNED_SHORT_5_6_5:
pixel_size_bytes = sizeof(u16);
break;
default:
VERIFY_NOT_REACHED();
}
// Calculate row offset at end to fit alignment
int const physical_width = pixels_per_row > 0 ? pixels_per_row : width;
size_t const physical_width_bytes = physical_width * pixel_size_bytes;
SoftGPU::ImageDataLayout layout;
layout.column_stride = pixel_size_bytes;
layout.row_stride = physical_width_bytes + (byte_alignment - physical_width_bytes % byte_alignment) % byte_alignment;
layout.depth_stride = 0;
if (type == GL_UNSIGNED_SHORT_5_6_5) {
layout.format = SoftGPU::ImageFormat::RGB565;
} else if (type == GL_UNSIGNED_BYTE) {
if (format == GL_RGB)
layout.format = SoftGPU::ImageFormat::RGB888;
else if (format == GL_BGR)
layout.format = SoftGPU::ImageFormat::BGR888;
else if (format == GL_RGBA)
layout.format = SoftGPU::ImageFormat::RGBA8888;
else if (format == GL_BGRA)
layout.format = SoftGPU::ImageFormat::BGRA8888;
}
Vector3<unsigned> offset {
static_cast<unsigned>(xoffset),
static_cast<unsigned>(yoffset),
0
};
Vector3<unsigned> size {
static_cast<unsigned>(width),
static_cast<unsigned>(height),
1
};
device_image()->write_texels(0, lod, offset, size, pixels, layout);
}
}
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