src/egl.c: error check eglCreateWindowSurface() call

Signed-off-by: Edward O'Callaghan <funfunctor@folklore1984.net>

1 files changed, 7 insertions, 1 deletions

diff --git a/src/egl.c b/src/egl.c
index 244bd67..c83c7cd 100644
--- a/src/egl.c
+++ b/src/egl.c
@@ -105,7 +105,13 @@ void init_egl(struct display * d)
 	if (!d->egl_ctx)
 		fprintf(stderr, "cannot create EGL context\n");
 
-	d->egl_surface = eglCreateWindowSurface(d->egl_display, d->egl_conf, (EGLNativeWindowType)d->dev->gbm_surface, NULL);
+	assert(d->dev->gbm_surface);
+	EGLNativeWindowType native_surface = (EGLNativeWindowType) d->dev->gbm_surface;
+	d->egl_surface = eglCreateWindowSurface(d->egl_display, d->egl_conf, native_surface, NULL);
+	if (d->egl_surface == EGL_NO_SURFACE) {
+		fprintf(stderr, "cannot create EGL surface\n");
+		assert(0);
+	}
 
 	/* connect the context to the surface */
 	eglMakeCurrent(d->egl_display, d->egl_surface, d->egl_surface, d->egl_ctx);