X-Git-Url: https://git.ralfj.de/gltest.git/blobdiff_plain/aa4575e1aa768daff8ca10c7a8a06aa0603e998f..92d3b1692f11658cad027cd597019eabd65faf89:/eglbackend.cpp

diff --git a/eglbackend.cpp b/eglbackend.cpp
index 359d54a..04165c7 100644
--- a/eglbackend.cpp
+++ b/eglbackend.cpp
@@ -1,3 +1,21 @@
+/* gltest - small OpenGL tearing test program
+ * Copyright (C) 2012-2013 Ralf Jung <post@ralfj.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
 #include "eglbackend.h"
 
 #include <stdlib.h>
@@ -94,11 +112,26 @@ EGLBackend::~EGLBackend()
 void EGLBackend::swapBuffers() const
 {
 	assert(context != EGL_NO_CONTEXT); // this implies the display is also initialized
-	eglSwapBuffers(display, surface);
+	if (eglSwapBuffers(display, surface) == EGL_FALSE)
+		exitEglError("Failed to swap buffers");
 }
 
 void EGLBackend::setSwapInterval(int i) const
 {
 	assert(context != EGL_NO_CONTEXT);
-	eglSwapInterval(display, i);
+	// check if swap interval value is supported
+	EGLint val;
+	eglGetConfigAttrib(display, config, EGL_MIN_SWAP_INTERVAL, &val);
+	if (i < val) {
+		fprintf(stderr, "Cannot set swap interval to %d, minimum supported value is %d\n", i, val);
+		exit(1);
+	}
+	eglGetConfigAttrib(display, config, EGL_MAX_SWAP_INTERVAL, &val);
+	if (i > val) {
+		fprintf(stderr, "Cannot set swap interval to %d, maximum supported value is %d\n", i, val);
+		exit(1);
+	}
+	// use it
+	if (eglSwapInterval(display, i) == EGL_FALSE)
+		exitEglError("Failed to set swap interval");
 }