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LibGL+LibGPU+LibSoftGPU: Implement flexible pixel format conversion

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A GPU (driver) is now responsible for reading and writing pixels from
and to user data. The client (LibGL) is responsible for specifying how
the user data must be interpreted or written to.

This allows us to centralize all pixel format conversion in one class,
`LibSoftGPU::PixelConverter`. For both the input and output image, it
takes a specification containing the image dimensions, the pixel type
and the selection (basically a clipping rect), and converts the pixels
from the input image to the output image.

Effectively this means we now support almost all OpenGL 1.5 formats,
and all custom logic has disappeared from:
  - `glDrawPixels`
  - `glReadPixels`
  - `glTexImage2D`
  - `glTexSubImage2D`

The new logic is still unoptimized, but on my machine I experienced no
noticeable slowdown. :^)
This commit is contained in:
Jelle Raaijmakers 2022-08-24 23:47:49 +02:00 • committed by Andreas Kling
parent d7cfdfe633
commit eb7c3d16fb
24 changed files with 1350 additions and 705 deletions
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30
Tests/LibGL/TestRender.cpp
View file

@ -169,3 +169,33 @@ TEST_CASE(0005_lines_antialiased)
context->present();
expect_bitmap_equals_reference(context->frontbuffer(), "0005_lines"sv);
}
TEST_CASE(0006_test_rgb565_texture)
{
auto context = create_testing_context(64, 64);
GLuint texture_id;
glGenTextures(1, &texture_id);
glBindTexture(GL_TEXTURE_2D, texture_id);
u16 texture_data[] = { 0xF800, 0xC000, 0x8000, 0x07E0, 0x0600, 0x0400, 0x001F, 0x0018, 0x0010 };
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, 3, 3, 0, GL_RGB, GL_UNSIGNED_SHORT_5_6_5, texture_data);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glEnable(GL_TEXTURE_2D);
glBegin(GL_QUADS);
glTexCoord2i(0, 0);
glVertex2i(-1, 1);
glTexCoord2i(0, 1);
glVertex2i(-1, -1);
glTexCoord2i(1, 1);
glVertex2i(1, -1);
glTexCoord2i(1, 0);
glVertex2i(1, 1);
glEnd();
EXPECT_EQ(glGetError(), 0u);
context->present();
expect_bitmap_equals_reference(context->frontbuffer(), "0006_test_rgb565_texture"sv);
}