Implemented CHECK_GL_ERROR macro for debugging OpenGL calls.

svn-id: r50731

2 files changed, 96 insertions, 0 deletions

diff --git a/backends/graphics/opengl/glerrorcheck.cpp b/backends/graphics/opengl/glerrorcheck.cpp
new file mode 100644
index 0000000000..76e8de9d8a
--- /dev/null
+++ b/backends/graphics/opengl/glerrorcheck.cpp
@@ -0,0 +1,58 @@
+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * 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.
+ *
+ * $URL$
+ * $Id$
+ *
+ */
+
+#if defined(DEBUG) //&& defined(USE_OPENGL)
+
+#include "backends/graphics/opengl/glerrorcheck.h"
+#include "common/debug.h"
+
+#ifdef USE_GLES
+#include <GLES/gl.h>
+#else
+#include <GL/gl.h>
+#endif
+
+static const char* getGlErrStr(GLenum error) {
+	switch (error) {
+	case GL_NO_ERROR:		   return "GL_NO_ERROR";
+	case GL_INVALID_ENUM:	   return "GL_INVALID_ENUM";
+	case GL_INVALID_OPERATION: return "GL_INVALID_OPERATION";
+	case GL_STACK_OVERFLOW:	   return "GL_STACK_OVERFLOW";
+	case GL_STACK_UNDERFLOW:   return "GL_STACK_UNDERFLOW";
+	case GL_OUT_OF_MEMORY:	   return "GL_OUT_OF_MEMORY";
+	}
+
+	static char buf[40];
+	snprintf(buf, sizeof(buf), "(Unknown GL error code 0x%x)", error);
+	return buf;
+}
+
+void checkGlError(const char* file, int line) {
+	GLenum error = glGetError();
+	if (error != GL_NO_ERROR)
+		warning("%s:%d: GL error: %s", file, line, getGlErrStr(error));
+}
+
+#endif
diff --git a/backends/graphics/opengl/glerrorcheck.h b/backends/graphics/opengl/glerrorcheck.h
new file mode 100644
index 0000000000..7c997eb288
--- /dev/null
+++ b/backends/graphics/opengl/glerrorcheck.h
@@ -0,0 +1,38 @@
+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * 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.
+ *
+ * $URL$
+ * $Id$
+ *
+ */
+
+#if !defined(DEBUG)
+
+// If not in debug, just do the GL call
+#define CHECK_GL_ERROR(call) (call)
+
+#else
+
+// If in debug, check for an error after a GL call
+#define CHECK_GL_ERROR(call) ((call), checkGlError(__FILE__, __LINE__))
+
+void checkGlError(const char* file, int line);
+
+#endif