Use the existing interfaces.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@1547 dfc29bdd-3216-0410-991c-e03cc46cb475

source/Irrlicht/COpenGLExtensionHandler.h

@@ -65,8 +65,6 @@ namespace irr
 namespace video
 {
 
-	class COpenGLTexture;
-
 static const char* const OpenGLFeatureStrings[] = {
 	"GL_3DFX_multisample",
 	"GL_3DFX_tbuffer",
@@ -684,7 +682,6 @@ class COpenGLExtensionHandler
 		IRR_OpenGL_Feature_Count
 	};
 
-	friend class COpenGLTexture;
 
 	// constructor
 	COpenGLExtensionHandler();

source/Irrlicht/COpenGLTexture.cpp

@@ -401,14 +401,14 @@ void* COpenGLTexture::lock(bool readOnly)
 
 		// allows to read pixels in top-to-bottom order
 #ifdef GL_MESA_pack_invert
-		if (Driver->FeatureAvailable[COpenGLExtensionHandler::IRR_MESA_pack_invert])
+		if (Driver->queryOpenGLFeature(COpenGLExtensionHandler::IRR_MESA_pack_invert))
 			glPixelStorei(GL_PACK_INVERT_MESA, GL_TRUE);
 #endif
 
 		glGetTexImage(GL_TEXTURE_2D, 0, GL_BGRA_EXT, GL_UNSIGNED_BYTE, pPixels);
 
 #ifdef GL_MESA_pack_invert
-		if (Driver->FeatureAvailable[COpenGLExtensionHandler::IRR_MESA_pack_invert])
+		if (Driver->queryOpenGLFeature(COpenGLExtensionHandler::IRR_MESA_pack_invert))
 			glPixelStorei(GL_PACK_INVERT_MESA, GL_FALSE);
 		else
 #endif