From 0f36a56b813c4270033804de8dd4f3412bedca55 Mon Sep 17 00:00:00 2001
From: Johannes Schickel
Date: Tue, 21 Jan 2014 23:52:20 +0100
Subject: OPENGL: Properly query for OpenGL errors.

There might be various error flags and we need to clear all of them to get
precise error results. Thus, we need to call glGetError in a loop to achieve
that.
---
 backends/graphics/opengl/debug.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

(limited to 'backends/graphics')

diff --git a/backends/graphics/opengl/debug.cpp b/backends/graphics/opengl/debug.cpp
index 69006bb975..d5d73fb5ec 100644
--- a/backends/graphics/opengl/debug.cpp
+++ b/backends/graphics/opengl/debug.cpp
@@ -52,9 +52,9 @@ Common::String getGLErrStr(GLenum error) {
 } // End of anonymous namespace
 
 void checkGLError(const char *expr, const char *file, int line) {
-	GLenum error = glGetError();
+	GLenum error;
 
-	if (error != GL_NO_ERROR) {
+	while ((error = glGetError()) != GL_NO_ERROR) {
 		// We cannot use error here because we do not know whether we have a
 		// working screen or not.
 		warning("GL ERROR: %s on %s (%s:%d)", getGLErrStr(error).c_str(), expr, file, line);
-- 
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