ladybird/Userland/Libraries/LibGL/Tex/Texture2D.cpp

144 lines
5 KiB
C++

/*
* 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, GLint, GLenum format, GLenum type, const GLvoid* 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);
mip.pixel_data().resize(width * height);
// No pixel data was supplied leave the texture memory uninitialized.
if (pixels == nullptr)
return;
m_internal_format = internal_format;
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, const GLvoid* 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);
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;
size_t const row_remainder_bytes = (physical_width - width) * pixel_size_bytes
+ (byte_alignment - physical_width_bytes % byte_alignment) % byte_alignment;
u8 const* pixel_byte_array = reinterpret_cast<u8 const*>(pixels);
auto get_next_pixel = [type, format](u8 const** pixels) -> u32 {
// Split bytes up into RGBA components
u8 c1, c2, c3, c4;
switch (type) {
case GL_UNSIGNED_BYTE:
c1 = *((*pixels)++);
c2 = *((*pixels)++);
c3 = *((*pixels)++);
if (format == GL_RGBA || format == GL_BGRA) {
c4 = *((*pixels)++);
} else {
c4 = 255;
}
break;
case GL_UNSIGNED_SHORT_5_6_5: {
u16 const s = *reinterpret_cast<u16 const*>((*pixels) += 2);
c1 = (s & 0xf800) >> 8;
c2 = (s & 0x7e0) >> 3;
c3 = (s & 0x1f) << 3;
c4 = 255;
break;
}
default:
VERIFY_NOT_REACHED();
}
// Reorder components into BGRA pixel
switch (format) {
case GL_BGR:
case GL_BGRA:
return ((c4 << 24) | (c3 << 16) | (c2 << 8) | c1);
case GL_RGB:
case GL_RGBA:
return ((c4 << 24) | (c1 << 16) | (c2 << 8) | c3);
default:
VERIFY_NOT_REACHED();
}
};
for (auto y = yoffset; y < yoffset + height; y++) {
for (auto x = xoffset; x < xoffset + width; x++) {
u32 pixel = get_next_pixel(&pixel_byte_array);
mip.pixel_data()[y * mip.width() + x] = pixel;
}
pixel_byte_array += row_remainder_bytes;
}
if (!device_image().is_null()) {
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);
}
}
}