render/egl: replace wlr_egl_create with wlr_egl_create_with_drm_fd

We never create an EGL context with the platform set to something
other than EGL_PLATFORM_GBM_KHR. Let's simplify wlr_egl_create by
taking a DRM FD instead of a (platform, remote_display) tuple.

This hides the internal details of creating an EGL context for a
specific device. This will allow us to transparently use the device
platform [1] when the time comes.

[1]: https://github.com/swaywm/wlroots/pull/2671

include/render/egl.h

@@ -11,10 +11,11 @@ struct wlr_egl_context {
 };
 
 /**
- * Initializes an EGL context for the given platform and remote display.
+ * Initializes an EGL context for the given DRM FD.
- * Will attempt to load all possibly required api functions.
+ *
+ * Will attempt to load all possibly required API functions.
  */
-struct wlr_egl *wlr_egl_create(EGLenum platform, void *remote_display);
+struct wlr_egl *wlr_egl_create_with_drm_fd(int drm_fd);
 
 /**
  * Frees all related EGL resources, makes the context not-current and

render/egl.c

@@ -156,7 +156,7 @@ out:
 	free(formats);
 }
 
-struct wlr_egl *wlr_egl_create(EGLenum platform, void *remote_display) {
+struct wlr_egl *wlr_egl_create_with_drm_fd(int drm_fd) {
 	struct wlr_egl *egl = calloc(1, sizeof(struct wlr_egl));
 	if (egl == NULL) {
 		wlr_log_errno(WLR_ERROR, "Allocation failed");
@@ -173,12 +173,10 @@ struct wlr_egl *wlr_egl_create(EGLenum platform, void *remote_display) {
 		return NULL;
 	}
 
-	if (platform == EGL_PLATFORM_GBM_KHR) {
 	if (!check_egl_ext(client_exts_str, "EGL_KHR_platform_gbm")) {
 		wlr_log(WLR_ERROR, "EGL_KHR_platform_gbm not supported");
 		return NULL;
 	}
-	}
 
 	if (!check_egl_ext(client_exts_str, "EGL_EXT_platform_base")) {
 		wlr_log(WLR_ERROR, "EGL_EXT_platform_base not supported");
@@ -206,8 +204,14 @@ struct wlr_egl *wlr_egl_create(EGLenum platform, void *remote_display) {
 		goto error;
 	}
 
-	egl->display = egl->procs.eglGetPlatformDisplayEXT(platform,
+	egl->gbm_device = gbm_create_device(drm_fd);
-		remote_display, NULL);
+	if (!egl->gbm_device) {
+		wlr_log(WLR_ERROR, "Failed to create GBM device");
+		goto error;
+	}
+
+	egl->display = egl->procs.eglGetPlatformDisplayEXT(EGL_PLATFORM_GBM_KHR,
+		egl->gbm_device, NULL);
 	if (egl->display == EGL_NO_DISPLAY) {
 		wlr_log(WLR_ERROR, "Failed to create EGL display");
 		goto error;

render/gles2/renderer.c

@@ -733,21 +733,12 @@ extern const GLchar tex_fragment_src_rgbx[];
 extern const GLchar tex_fragment_src_external[];
 
 struct wlr_renderer *wlr_gles2_renderer_create_with_drm_fd(int drm_fd) {
-	struct gbm_device *gbm_device = gbm_create_device(drm_fd);
+	struct wlr_egl *egl = wlr_egl_create_with_drm_fd(drm_fd);
-	if (!gbm_device) {
-		wlr_log(WLR_ERROR, "Failed to create GBM device");
-		return NULL;
-	}
-
-	struct wlr_egl *egl = wlr_egl_create(EGL_PLATFORM_GBM_KHR, gbm_device);
 	if (egl == NULL) {
 		wlr_log(WLR_ERROR, "Could not initialize EGL");
-		gbm_device_destroy(gbm_device);
 		return NULL;
 	}
 
-	egl->gbm_device = gbm_device;
-
 	struct wlr_renderer *renderer = wlr_gles2_renderer_create(egl);
 	if (!renderer) {
 		wlr_log(WLR_ERROR, "Failed to create GLES2 renderer");