SDL_gpu on RPi5 and KMSDRM

SDL Development
1

Hi,

I successfully ran SDL_gpu on my mac, and try to port my stuff onto rpi5 with no X11, only kmsdrm. However, SDL fails to open vulkan, and it seems it’s related to rpi5 supposedly not supporting VK_KHR_SURFACE_EXTENSION_NAME.

Have anyone succeeded in using SDL_gpu in this context?

Best,

Stéphane

2

so I installed libdrm, mesa, SDL fresh from github.
Now I get an SDL error Vulkan can't find any displays., presumably because vkGetPhysicalDeviceDisplayPropertiesKHRreturns 0.

Still investigating.

This is what SDL says with SDL_LOGGING set to verbose:

App name: SDL Application
App version: <unspecified>
App ID: <unspecified>
SDL revision: SDL3-3.3.0-113eb6f
/dev/dri/card1 connector, encoder and CRTC counts are: 2 4 4
/dev/dri/card1 connector, encoder and CRTC counts are: 2 4 4
KMSDRM_VideoInit()
Opening device /dev/dri/card1
Opened DRM FD (5)
WARNING: Validation layers not found, continuing without validation
SDL_GPU Driver: Vulkan
Vulkan Device: V3D 7.1.7.0
Vulkan Driver: V3DV Mesa Mesa 25.1.0-devel (git-b6b8193534)
Vulkan Conformance: 1.3.3