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bccfa205d3
We can get rid of a `VERIFY` since we already do this in `Array::at()`. Also move `::mipmap()` to the header file so it is inlined in `Sampler2D`.
113 lines
4.4 KiB
C++
113 lines
4.4 KiB
C++
/*
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* Copyright (c) 2021, Jesse Buhagiar <jooster669@gmail.com>
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* Copyright (c) 2021, Stephan Unverwerth <s.unverwerth@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibGL/GL/gl.h>
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#include <LibGL/Tex/Texture2D.h>
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namespace GL {
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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)
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{
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// NOTE: Some target, format, and internal formats are currently unsupported.
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// Considering we control this library, and `gl.h` itself, we don't need to add any
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// checks here to see if we support them; the program will simply fail to compile..
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auto& mip = m_mipmaps[lod];
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mip.set_width(width);
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mip.set_height(height);
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mip.pixel_data().resize(width * height);
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// No pixel data was supplied leave the texture memory uninitialized.
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if (pixels == nullptr)
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return;
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m_internal_format = internal_format;
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replace_sub_texture_data(lod, 0, 0, width, height, format, type, pixels, pixels_per_row, byte_alignment);
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}
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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)
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{
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auto& mip = m_mipmaps[lod];
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// FIXME: We currently only support GL_UNSIGNED_BYTE pixel data
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VERIFY(type == GL_UNSIGNED_BYTE);
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VERIFY(xoffset >= 0 && yoffset >= 0 && xoffset + width <= mip.width() && yoffset + height <= mip.height());
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VERIFY(pixels_per_row == 0 || pixels_per_row >= xoffset + width);
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// Calculate row offset at end to fit alignment
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int const physical_width = pixels_per_row > 0 ? pixels_per_row : width;
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u8 const component_size_bytes = sizeof(u8);
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u8 const component_count = (format == GL_RGBA || format == GL_BGRA) ? 4 : 3;
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size_t const physical_width_bytes = physical_width * component_count * component_size_bytes;
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size_t const row_remainder_bytes = (physical_width - width) * component_count * component_size_bytes
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+ (byte_alignment - physical_width_bytes % byte_alignment) % byte_alignment;
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u8 const* pixel_byte_array = reinterpret_cast<u8 const*>(pixels);
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if (format == GL_RGBA) {
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for (auto y = yoffset; y < yoffset + height; y++) {
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for (auto x = xoffset; x < xoffset + width; x++) {
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u32 r = *pixel_byte_array++;
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u32 g = *pixel_byte_array++;
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u32 b = *pixel_byte_array++;
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u32 a = *pixel_byte_array++;
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u32 pixel = ((a << 24) | (r << 16) | (g << 8) | b);
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mip.pixel_data()[y * mip.width() + x] = pixel;
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}
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pixel_byte_array += row_remainder_bytes;
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}
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} else if (format == GL_BGRA) {
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for (auto y = yoffset; y < yoffset + height; y++) {
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for (auto x = xoffset; x < xoffset + width; x++) {
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u32 b = *pixel_byte_array++;
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u32 g = *pixel_byte_array++;
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u32 r = *pixel_byte_array++;
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u32 a = *pixel_byte_array++;
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u32 pixel = ((a << 24) | (r << 16) | (g << 8) | b);
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mip.pixel_data()[y * mip.width() + x] = pixel;
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}
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pixel_byte_array += row_remainder_bytes;
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}
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} else if (format == GL_BGR) {
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for (auto y = yoffset; y < yoffset + height; y++) {
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for (auto x = xoffset; x < xoffset + width; x++) {
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u32 b = *pixel_byte_array++;
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u32 g = *pixel_byte_array++;
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u32 r = *pixel_byte_array++;
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u32 a = 255;
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u32 pixel = ((a << 24) | (r << 16) | (g << 8) | b);
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mip.pixel_data()[y * mip.width() + x] = pixel;
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}
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pixel_byte_array += row_remainder_bytes;
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}
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} else if (format == GL_RGB) {
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for (auto y = yoffset; y < yoffset + height; y++) {
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for (auto x = xoffset; x < xoffset + width; x++) {
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u32 r = *pixel_byte_array++;
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u32 g = *pixel_byte_array++;
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u32 b = *pixel_byte_array++;
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u32 a = 255;
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u32 pixel = ((a << 24) | (r << 16) | (g << 8) | b);
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mip.pixel_data()[y * mip.width() + x] = pixel;
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}
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pixel_byte_array += row_remainder_bytes;
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}
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} else {
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VERIFY_NOT_REACHED();
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}
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}
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}
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