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WindowServer: Coordinate double-buffering with the BochsVGA card.

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Use the BochsVGA card's virtual-height + virtual-y features to implement
a "hardware double buffering" type scheme.

This is a performance degradation since we now draw a bunch more than before.
But there's also no tearing or cursor flickering. I'm gonna commit this and
try to improve upon it. :^)
This commit is contained in:
Andreas Kling 2019-02-07 08:53:57 +01:00
parent 1f159eaab0
commit 443d1c2237
6 changed files with 52 additions and 15 deletions
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2
Kernel/ProcessGUI.cpp
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@ -276,7 +276,7 @@ DisplayInfo Process::set_video_resolution(int width, int height)
info.height = height;
info.bpp = 32;
info.pitch = width * 4;
size_t framebuffer_size = width * height * 4;
size_t framebuffer_size = width * height * 4 * 2;
if (!m_display_framebuffer_region) {
auto framebuffer_vmo = VMObject::create_framebuffer_wrapper(BochsVGADevice::the().framebuffer_address(), framebuffer_size);
m_display_framebuffer_region = allocate_region_with_vmo(LinearAddress(0xe0000000), framebuffer_size, move(framebuffer_vmo), 0, "framebuffer", true, true);