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server: allow external renderer and allocator on Android

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On Android, the standard wlr_renderer_autocreate() and
wlr_allocator_autocreate() paths fail because there is no DRM
subsystem. Android apps create EGL contexts via eglGetDisplay()
and provide GPU buffers via AHardwareBuffer.

Add hooks guarded by #ifdef __ANDROID__ that check for externally
provided renderer/allocator globals before falling back to
autocreate. This allows the JNI bridge to:

1. Create an EGL context via Android's native EGL
2. Wrap it in wlr_egl_create_with_context()
3. Create a GLES2 renderer via wlr_gles2_renderer_create()
4. Provide a custom allocator (e.g. AHardwareBuffer-based)

The globals (android_renderer, android_allocator) are declared
extern and only referenced when __ANDROID__ is defined, so there
is no impact on non-Android builds.

Ref: https://github.com/GlassOnTin/Haven/issues/47
This commit is contained in:
GlassOnTin 2026-03-31 00:11:41 +01:00
parent 9a8154836c
commit c902d6d6a8
1 changed files with 21 additions and 3 deletions
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24
src/server.c
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@ -502,7 +502,17 @@ server_init(void)
* The renderer is responsible for defining the various pixel formats it
* supports for shared memory, this configures that for clients.
*/
server.renderer = wlr_renderer_autocreate(server.backend);
#ifdef __ANDROID__
/* Android: accept externally created renderer (e.g. GLES2 via
* eglGetDisplay + wlr_egl_create_with_context) */
extern struct wlr_renderer *android_renderer;
if (android_renderer) {
server.renderer = android_renderer;
} else
#endif
{
server.renderer = wlr_renderer_autocreate(server.backend);
}
if (!server.renderer) {
wlr_log(WLR_ERROR, "unable to create renderer");
exit(EXIT_FAILURE);
@ -541,8 +551,16 @@ server_init(void)
* the renderer and the backend. It handles the buffer creation,
* allowing wlroots to render onto the screen
*/
server.allocator = wlr_allocator_autocreate(
server.backend, server.renderer);
#ifdef __ANDROID__
extern struct wlr_allocator *android_allocator;
if (android_allocator) {
server.allocator = android_allocator;
} else
#endif
{
server.allocator = wlr_allocator_autocreate(
server.backend, server.renderer);
}
if (!server.allocator) {
wlr_log(WLR_ERROR, "unable to create allocator");
exit(EXIT_FAILURE);