96 lines
3.5 KiB
C++
96 lines
3.5 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, GLenum format, GLenum type, GLvoid const* 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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m_internal_format = internal_format;
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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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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, GLvoid const* 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 and GL_UNSIGNED_SHORT_5_6_5 pixel data
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VERIFY(type == GL_UNSIGNED_BYTE || type == GL_UNSIGNED_SHORT_5_6_5);
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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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// FIXME: We currently depend on the first glTexImage2D call to attach an image to mipmap level 0, which initializes the GPU image
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// Ideally we would create separate GPU images for each level and merge them into a final image
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// once used for rendering for the first time.
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if (device_image().is_null())
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return;
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u8 pixel_size_bytes;
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switch (type) {
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case GL_UNSIGNED_BYTE:
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pixel_size_bytes = (format == GL_RGBA || format == GL_BGRA) ? 4 : 3;
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break;
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case GL_UNSIGNED_SHORT_5_6_5:
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pixel_size_bytes = sizeof(u16);
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break;
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default:
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VERIFY_NOT_REACHED();
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}
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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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size_t const physical_width_bytes = physical_width * pixel_size_bytes;
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GPU::ImageDataLayout layout;
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layout.column_stride = pixel_size_bytes;
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layout.row_stride = physical_width_bytes + (byte_alignment - physical_width_bytes % byte_alignment) % byte_alignment;
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layout.depth_stride = 0;
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if (type == GL_UNSIGNED_SHORT_5_6_5) {
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layout.format = GPU::ImageFormat::RGB565;
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} else if (type == GL_UNSIGNED_BYTE) {
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if (format == GL_RGB)
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layout.format = GPU::ImageFormat::RGB888;
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else if (format == GL_BGR)
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layout.format = GPU::ImageFormat::BGR888;
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else if (format == GL_RGBA)
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layout.format = GPU::ImageFormat::RGBA8888;
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else if (format == GL_BGRA)
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layout.format = GPU::ImageFormat::BGRA8888;
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}
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Vector3<unsigned> offset {
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static_cast<unsigned>(xoffset),
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static_cast<unsigned>(yoffset),
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0
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};
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Vector3<unsigned> size {
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static_cast<unsigned>(width),
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static_cast<unsigned>(height),
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1
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};
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device_image()->write_texels(0, lod, offset, size, pixels, layout);
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}
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}
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