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Simon Ser b7505b23cf Get DMA-BUF from wlr_buffer if possible 
wlr_texture_to_dmabuf involves issuing EGL commands to get a DMA-BUF out
of an EGLImage.

When the client submits a DMA-BUF via the linux-dmabuf protocol, there's
no need to go through EGL. We can directly import the client's DMA-BUF
into Vulkan.

The old code is still retained as a fallback in case the client uses
wl_drm (old Xwayland) or wl_shm. Removing it would involve creating a
Vulkan-based wlr_renderer.

References: https://github.com/Plagman/gamescope/issues/16
2020-07-23 22:14:17 +02:00
src Get DMA-BUF from wlr_buffer if possible 2020-07-23 22:14:17 +02:00
subprojects Upgrade to wlroots 0.11.0 2020-07-23 13:37:33 +02:00
.gitmodules Switch to upstream wlroots 2020-05-19 22:21:45 +02:00
LICENSE docs: add back license file 2020-01-01 15:30:38 +09:00
meson.build Get rid of C_SIDE 2020-06-11 12:44:36 +02:00
README.md Correct integer scaling example in README 2020-05-13 01:37:31 +02:00

README.md

gamescope: the micro-compositor formerly known as steamcompmgr

In an embedded session usecase, gamescope does the same thing as steamcompmgr, but with less extra copies and latency:

  • It's getting game frames through Wayland by way of Xwayland, so there's no copy within X itself before it gets the frame.
  • It can use DRM/KMS to directly flip game frames to the screen, even when stretching or when notifications are up, removing another copy.
  • When it does need to composite with the GPU, it does so with async Vulkan compute, meaning you get to see your frame quick even if the game already has the GPU busy with the next frame.

It also runs on top of a regular desktop, the 'nested' usecase steamcompmgr didn't support.

  • Because the game is running in its own personal Xwayland sandbox desktop, it can't interfere with your desktop and your desktop can't interfere with it.
  • You can spoof a virtual screen with a desired resolution and refresh rate as the only thing the game sees, and control/resize the output as needed. This can be useful in exotic display configurations like ultrawide or multi-monitor setups that involve rotation.

It runs on Mesa+AMDGPU, and could be made to run on other Mesa/DRM drivers with minimal work. Can support NVIDIA if/when they support accelerated Xwayland.

If running RadeonSI clients, currently have to set R600_DEBUG=nodcc, or corruption will be observed until the stack picks up DRM modifiers support.

Keyboard shortcuts

Meta + F : Toggle fullscreen Meta + N : Toggle integer scaling

Examples

On any X11 or Wayland desktop running Mesa with commit 3746ee91, you can set the Steam launch arguments of your game as follows:

// Upscale a 720p game to 1080p with integer scaling
gamescope -w 1280 -h 720 -W 1920 -H 1080 -n -- %command%

// Limit a vsynced game to 30 FPS:
gamescope -r 30 -- %command%

// Run the game at 1080p, but scale output to a fullscreen 3440×1440 pillarboxed ultrawide window
gamescope -w 1920 -h 1080 -W 3440 -H 1440 -b -- %command%