gl-renderer: do not even pick a config with configless_context

If configless context is supported, we can skip choosing the "base" config
completely as it will never be used.

This simplifies the code a little bit.

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

libweston/renderer-gl/egl-glue.c

@@ -198,8 +198,7 @@ gl_renderer_get_egl_config(struct gl_renderer *gr,
 	 * everything.
 	 */
 	if (gr->egl_config != EGL_NO_CONFIG_KHR &&
-	    egl_config != gr->egl_config &&
-	    !gr->has_configless_context) {
+	    egl_config != gr->egl_config) {
 		weston_log("Found an EGLConfig but it is not usable because "
 			   "neither EGL_KHR_no_config_context nor "
 			   "EGL_MESA_configless_context are supported by EGL.\n");

libweston/renderer-gl/gl-renderer.c

@@ -3454,19 +3454,21 @@ gl_renderer_display_create(struct weston_compositor *ec,
 
 	log_egl_info(gr->egl_display);
 
-	gr->egl_config = gl_renderer_get_egl_config(gr, config_attribs,
-						    drm_formats,
-						    drm_formats_count);
-	if (gr->egl_config == EGL_NO_CONFIG_KHR) {
-		weston_log("failed to choose EGL config\n");
-		goto fail_terminate;
-	}
-
 	ec->renderer = &gr->base;
 
 	if (gl_renderer_setup_egl_extensions(ec) < 0)
 		goto fail_with_error;
 
+	if (!gr->has_configless_context) {
+		gr->egl_config = gl_renderer_get_egl_config(gr, config_attribs,
+							    drm_formats,
+							    drm_formats_count);
+		if (gr->egl_config == EGL_NO_CONFIG_KHR) {
+			weston_log("failed to choose EGL config\n");
+			goto fail_terminate;
+		}
+	}
+
 	ec->capabilities |= WESTON_CAP_ROTATION_ANY;
 	ec->capabilities |= WESTON_CAP_CAPTURE_YFLIP;
 	ec->capabilities |= WESTON_CAP_VIEW_CLIP_MASK;
@@ -3610,7 +3612,6 @@ gl_renderer_setup(struct weston_compositor *ec, EGLSurface egl_surface)
 {
 	struct gl_renderer *gr = get_renderer(ec);
 	const char *extensions;
-	EGLConfig context_config;
 	EGLBoolean ret;
 
 	EGLint context_attribs[16] = {
@@ -3639,20 +3640,15 @@ gl_renderer_setup(struct weston_compositor *ec, EGLSurface egl_surface)
 	assert(nattr < ARRAY_LENGTH(context_attribs));
 	context_attribs[nattr] = EGL_NONE;
 
-	context_config = gr->egl_config;
-
-	if (gr->has_configless_context)
-		context_config = EGL_NO_CONFIG_KHR;
-
 	/* try to create an OpenGLES 3 context first */
 	context_attribs[1] = 3;
-	gr->egl_context = eglCreateContext(gr->egl_display, context_config,
+	gr->egl_context = eglCreateContext(gr->egl_display, gr->egl_config,
 					   EGL_NO_CONTEXT, context_attribs);
 	if (gr->egl_context == NULL) {
 		/* and then fallback to OpenGLES 2 */
 		context_attribs[1] = 2;
 		gr->egl_context = eglCreateContext(gr->egl_display,
-						   context_config,
+						   gr->egl_config,
 						   EGL_NO_CONTEXT,
 						   context_attribs);
 		if (gr->egl_context == NULL) {