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LibGL+LibSoftGPU: Implement glDrawPixels depth buffer support

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This enabled writing directly to the depth buffer, and allows games
like Grim Fandango to render their pre-baked depth buffers correctly!
This commit is contained in:
Jelle Raaijmakers 2022-01-12 17:08:59 +01:00 • committed by Andreas Kling
parent ca78327a96
commit 8efd6bc878
3 changed files with 52 additions and 15 deletions
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20
Userland/Libraries/LibSoftGPU/Device.cpp
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@ -992,6 +992,26 @@ void Device::blit_to_color_buffer_at_raster_position(Gfx::Bitmap const& source)
painter.blit({ blit_rect.x(), blit_rect.y() }, source, source.rect(), 1.0f, true);
}
void Device::blit_to_depth_buffer_at_raster_position(Vector<float> const& depth_values, size_t width, size_t height)
{
if (!m_raster_position.valid)
return;
auto const raster_rect = raster_rect_in_target_coordinates({ width, height });
auto const y1 = raster_rect.y();
auto const y2 = y1 + height;
auto const x1 = raster_rect.x();
int const x2 = x1 + width;
auto index = 0;
for (int y = y2 - 1; y >= y1; --y) {
auto depth_line = m_depth_buffer->scanline(y);
for (int x = x1; x < x2; ++x) {
depth_line[x] = depth_values.at(index++);
}
}
}
void Device::blit_to(Gfx::Bitmap& target)
{
wait_for_all_threads();