added CHECKGLERROR define in gltools/misc

gltools/misc.cpp

@@ -2,6 +2,8 @@
 
 #include "gl.h"
 
+#include <iostream>
+
 namespace base
 {
 	//
@@ -132,4 +134,42 @@ namespace base
 			glEnd();
 		}
 	}
+
+
+
+	std::string glErrorString( int glErrorCode )
+	{
+		switch(glErrorCode)
+		{
+		case GL_NO_ERROR:
+				return "No error has been recorded.";break;
+		case GL_INVALID_ENUM:
+				return "An unacceptable value is specified for an enumerated argument.";break;
+		case GL_INVALID_VALUE:
+				return "A numeric argument is out of range.";break;
+		case GL_INVALID_OPERATION:
+			return "The specified operation is not allowed in the current state.";break;
+		case GL_STACK_OVERFLOW:
+			return "This command would cause a stack overflow.";break;
+		case GL_STACK_UNDERFLOW:
+			return "This command would cause a stack underflow.";break;
+		case GL_OUT_OF_MEMORY:
+			return "There is not enough memory left to execute the command.";break;
+		case GL_TABLE_TOO_LARGE:
+			return "GL_TABLE_TOO_LARGE";break;
+		default:
+			return "";
+		};
+		return "";
+	}
+	bool checkGlError(const char *file, int line)
+	{
+		GLenum err = glGetError();
+		if (err != GL_NO_ERROR)
+		{
+			std::cerr << "OpenGL Error at " << file << " line " << line << ":" << glErrorString(err) << std::endl;
+			return true;
+		}
+		return false;
+	}
 }

gltools/misc.h

@@ -1,14 +1,17 @@
 #pragma once
-
+#include <string>
 #include <math/Math.h>
 
-
+#define CHECKGLERROR() checkGlError(__FILE__, __LINE__)
 
 namespace base
 {
 	void                                      drawGrid( bool axes = true );  ///< draw a orientation grid identical to the ones used in popular dcc apps
 	void                        drawTransform( const math::Matrix44f &tm );  ///< draw orientation vectors for given transform
 	void                                                       headLight();  ///< sets light0 parameters accordingly
+
+	std::string                           glErrorString( int glErrorCode );
+	bool                          checkGlError(const char *file, int line); // returns true if there was an error
 }