gl-renderer: use gl_renderer_get_egl_config() for display_create

Replace a direct call to egl_choose_config() with a higher level function
gl_renderer_get_egl_config(). This will make follow-up work easier when
attribute lists will be generated inside gl_renderer_get_egl_config() instead
of passed in as is.

We explicitly replace visual_id with drm_formats, because that is what they
really are. Only the DRM backend passes in other than NULL/0, and if other
backends start caring about the actual pixel format, drm_format is the lingua
franca.

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.com>

libweston/backend-drm/drm.c

@@ -735,12 +735,12 @@ fallback_format_for(uint32_t format)
 static int
 drm_backend_create_gl_renderer(struct drm_backend *b)
 {
-	EGLint format[3] = {
+	uint32_t format[3] = {
 		b->gbm_format,
 		fallback_format_for(b->gbm_format),
 		0,
 	};
-	int n_formats = 2;
+	unsigned n_formats = 2;
 
 	if (format[1])
 		n_formats = 3;

libweston/renderer-gl/gl-renderer.c

@@ -3388,8 +3388,8 @@ gl_renderer_display_create(struct weston_compositor *ec,
 			   EGLenum platform,
 			   void *native_display,
 			   const EGLint *config_attribs,
-			   const EGLint *visual_id,
+			   const uint32_t *drm_formats,
-			   int n_ids)
+			   unsigned drm_formats_count)
 {
 	struct gl_renderer *gr;
 	EGLint major, minor;
@@ -3454,8 +3454,10 @@ gl_renderer_display_create(struct weston_compositor *ec,
 
 	log_egl_info(gr->egl_display);
 
-	if (egl_choose_config(gr, config_attribs, visual_id,
+	gr->egl_config = gl_renderer_get_egl_config(gr, config_attribs,
-			      n_ids, &gr->egl_config) < 0) {
+						    drm_formats,
+						    drm_formats_count);
+	if (gr->egl_config == EGL_NO_CONFIG_KHR) {
 		weston_log("failed to choose EGL config\n");
 		goto fail_terminate;
 	}

libweston/renderer-gl/gl-renderer.h

@@ -64,8 +64,8 @@ struct gl_renderer_interface {
 			      EGLenum platform,
 			      void *native_display,
 			      const EGLint *config_attribs,
-			      const EGLint *visual_id,
+			      const uint32_t *drm_formats,
-			      const int n_ids);
+			      unsigned drm_formats_count);
 
 	int (*output_window_create)(struct weston_output *output,
 				    EGLNativeWindowType window_for_legacy,