compositor-drm: Match the EGLConfig native visual ID if it has one

We'll add the GBM format code as the native visual ID for EGLConfigs
when running on GBM.  This patch lets the drm backend pass in the
format code it's using with KMS and make sure we get a confing that
matches.  In the future, mesa will add support for 10 bpc configs
which will match the "at least 8 color bits" requirement.  By also
matching the native visual ID, we avoid rendering XRGB2101010 into a
XRGB8888 KMS framebuffer.

src/compositor-drm.c

@@ -85,6 +85,7 @@ struct drm_compositor {
 	uint32_t crtc_allocator;
 	uint32_t connector_allocator;
 	struct wl_listener session_listener;
+	uint32_t format;
 
 	/* we need these parameters in order to not fail drmModeAddFB2()
 	 * due to out of bounds dimensions, and then mistakenly set
@@ -495,7 +496,7 @@ drm_output_render_gl(struct drm_output *output, pixman_region32_t *damage)
 		return;
 	}
 
-	output->next = drm_fb_get_from_bo(bo, c, GBM_FORMAT_XRGB8888);
+	output->next = drm_fb_get_from_bo(bo, c, c->format);
 	if (!output->next) {
 		weston_log("failed to get drm_fb for bo\n");
 		gbm_surface_release_buffer(output->surface, bo);
@@ -1246,8 +1247,9 @@ init_egl(struct drm_compositor *ec)
 	if (!ec->gbm)
 		return -1;
 
-	if (gl_renderer_create(&ec->base, ec->gbm, gl_renderer_opaque_attribs,
-			NULL) < 0) {
+	if (gl_renderer_create(&ec->base, ec->gbm,
+			       gl_renderer_opaque_attribs,
+			       &ec->format) < 0) {
 		gbm_device_destroy(ec->gbm);
 		return -1;
 	}
@@ -1441,7 +1443,7 @@ drm_output_init_egl(struct drm_output *output, struct drm_compositor *ec)
 	output->surface = gbm_surface_create(ec->gbm,
 					     output->base.current_mode->width,
 					     output->base.current_mode->height,
-					     GBM_FORMAT_XRGB8888,
+					     ec->format,
 					     GBM_BO_USE_SCANOUT |
 					     GBM_BO_USE_RENDERING);
 	if (!output->surface) {
@@ -2552,7 +2554,7 @@ drm_compositor_create(struct wl_display *display,
 	/* KMS support for sprites is not complete yet, so disable the
 	 * functionality for now. */
 	ec->sprites_are_broken = 1;
-
+	ec->format = GBM_FORMAT_XRGB8888;
 	ec->use_pixman = pixman;
 
 	if (weston_compositor_init(&ec->base, display, argc, argv,

src/gl-renderer.c

@@ -1587,7 +1587,7 @@ egl_choose_config(struct gl_renderer *gr, const EGLint *attribs,
 					&id))
 				continue;
 
-			if (id != *visual_id)
+			if (id != 0 && id != *visual_id)
 				continue;
 		}