gl-renderer: Refactor gl_renderer_output_window_create()

This change refactors gl_renderer_output_window_create() to separate out
window surface creation code from output common creation code.

Signed-off-by: Miguel A Vico Moya <mvicomoya@nvidia.com>
Reviewed-by: Andy Ritger <aritger@nvidia.com>
Reviewed-by: James Jones <jajones@nvidia.com>
[Pekka: rebased and removed unused 'gr' and 'ec']
Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>

libweston/gl-renderer.c

@@ -1,6 +1,7 @@
 /*
  * Copyright © 2012 Intel Corporation
  * Copyright © 2015 Collabora, Ltd.
+ * Copyright © 2016 NVIDIA Corporation
  *
  * Permission is hereby granted, free of charge, to any person obtaining
  * a copy of this software and associated documentation files (the
@@ -2639,24 +2640,21 @@ gl_renderer_output_set_border(struct weston_output *output,
 static int
 gl_renderer_setup(struct weston_compositor *ec, EGLSurface egl_surface);
 
-static int
-gl_renderer_output_window_create(struct weston_output *output,
+static EGLSurface
+gl_renderer_create_window_surface(struct gl_renderer *gr,
 				  EGLNativeWindowType window_for_legacy,
 				  void *window_for_platform,
 				  const EGLint *config_attribs,
 				  const EGLint *visual_id,
 				  int n_ids)
 {
-	struct weston_compositor *ec = output->compositor;
-	struct gl_renderer *gr = get_renderer(ec);
-	struct gl_output_state *go;
+	EGLSurface egl_surface = EGL_NO_SURFACE;
 	EGLConfig egl_config;
-	int i;
 
 	if (egl_choose_config(gr, config_attribs, visual_id,
 			      n_ids, &egl_config) == -1) {
 		weston_log("failed to choose EGL config for output\n");
-		return -1;
+		return EGL_NO_SURFACE;
 	}
 
 	if (egl_config != gr->egl_config &&
@@ -2664,42 +2662,75 @@ gl_renderer_output_window_create(struct weston_output *output,
 		weston_log("attempted to use a different EGL config for an "
 			   "output but EGL_MESA_configless_context is not "
 			   "supported\n");
-		return -1;
+		return EGL_NO_SURFACE;
 	}
 
-	go = zalloc(sizeof *go);
-	if (go == NULL)
-		return -1;
+	log_egl_config_info(gr->egl_display, egl_config);
 
-	if (gr->create_platform_window) {
-		go->egl_surface =
-			gr->create_platform_window(gr->egl_display,
+	if (gr->create_platform_window)
+		egl_surface = gr->create_platform_window(gr->egl_display,
 							 egl_config,
 							 window_for_platform,
 							 NULL);
-	} else {
-		go->egl_surface =
-			eglCreateWindowSurface(gr->egl_display,
+	else
+		egl_surface = eglCreateWindowSurface(gr->egl_display,
 						     egl_config,
 						     window_for_legacy, NULL);
-	}
 
-	if (go->egl_surface == EGL_NO_SURFACE) {
-		weston_log("failed to create egl surface\n");
-		free(go);
+	return egl_surface;
+}
+
+static int
+gl_renderer_output_create(struct weston_output *output,
+			  EGLSurface surface)
+{
+	struct gl_output_state *go;
+	int i;
+
+	go = zalloc(sizeof *go);
+	if (go == NULL)
 		return -1;
-	}
+
+	go->egl_surface = surface;
 
 	for (i = 0; i < BUFFER_DAMAGE_COUNT; i++)
 		pixman_region32_init(&go->buffer_damage[i]);
 
 	output->renderer_state = go;
 
-	log_egl_config_info(gr->egl_display, egl_config);
-
 	return 0;
 }
 
+static int
+gl_renderer_output_window_create(struct weston_output *output,
+				 EGLNativeWindowType window_for_legacy,
+				 void *window_for_platform,
+				 const EGLint *config_attribs,
+				 const EGLint *visual_id,
+				 int n_ids)
+{
+	struct weston_compositor *ec = output->compositor;
+	struct gl_renderer *gr = get_renderer(ec);
+	EGLSurface egl_surface = EGL_NO_SURFACE;
+	int ret = 0;
+
+	egl_surface = gl_renderer_create_window_surface(gr,
+							window_for_legacy,
+							window_for_platform,
+							config_attribs,
+							visual_id, n_ids);
+	if (egl_surface == EGL_NO_SURFACE) {
+		weston_log("failed to create egl surface\n");
+		return -1;
+	}
+
+	ret = gl_renderer_output_create(output, egl_surface);
+	if (ret < 0)
+		eglDestroySurface(gr->egl_display, egl_surface);
+
+	return ret;
+}
+
 static void
 gl_renderer_output_destroy(struct weston_output *output)
 {