Fixed: Don't crash if GL_VERSION returns NULL (it should never happen)

--HG--
branch : develop

code/nel/src/3d/driver/opengl/driver_opengl.cpp

@@ -1352,9 +1352,9 @@ void CDriverGL::getZBufferPart (std::vector<float>  &zbuffer, NLMISC::CRect &rec
 #ifdef USE_OPENGLES
 		glReadPixels (rect.X, rect.Y, rect.Width, rect.Height, GL_DEPTH_COMPONENT16_OES, GL_FLOAT, &(zbuffer[0]));
 #else
-		glPixelTransferf(GL_DEPTH_SCALE, 1.0f) ;
-		glPixelTransferf(GL_DEPTH_BIAS, 0.f) ;
-		glReadPixels (rect.X, rect.Y, rect.Width, rect.Height, GL_DEPTH_COMPONENT , GL_FLOAT, &(zbuffer[0]));
+		glPixelTransferf(GL_DEPTH_SCALE, 1.0f);
+		glPixelTransferf(GL_DEPTH_BIAS, 0.f);
+		glReadPixels(rect.X, rect.Y, rect.Width, rect.Height, GL_DEPTH_COMPONENT , GL_FLOAT, &(zbuffer[0]));
 #endif
 	}
 }

code/nel/src/3d/driver/opengl/driver_opengl_extension.cpp

@@ -1566,12 +1566,21 @@ void	registerGlExtensions(CGlExtensions &ext)
 	H_AUTO_OGL(registerGlExtensions);
 
 	// OpenGL 1.2 ??
-	const char	*nglVersion= (const char *)glGetString (GL_VERSION);
-	sint	a=0, b=0;
+	const char	*nglVersion = (const char *)glGetString (GL_VERSION);
 
-	// 1.2***  ???
-	sscanf(nglVersion, "%d.%d", &a, &b);
-	ext.Version1_2 = (a==1 && b>=2) || (a>=2);
+	if (nglVersion)
+	{
+		sint a = 0, b = 0;
+
+		// 1.2***  ???
+		sscanf(nglVersion, "%d.%d", &a, &b);
+		ext.Version1_2 = (a==1 && b>=2) || (a>=2);
+	}
+	else
+	{
+		nlwarning("3D: Unable to get GL_VERSION, OpenGL 1.2 should be supported on all recent GPU...");
+		ext.Version1_2 = true;
+	}
 
 	const char *vendor = (const char *) glGetString (GL_VENDOR);
 	const char *renderer = (const char *) glGetString (GL_RENDERER);