Hmm, general front buffer reading is bad for texture based RTTs, so fixed this...

Hmm, general front buffer reading is bad for texture based RTTs, so fixed this change to the screenshot method.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@1558 dfc29bdd-3216-0410-991c-e03cc46cb475

source/Irrlicht/COpenGLDriver.cpp

@@ -319,8 +319,6 @@ bool COpenGLDriver::genericDriverInit(const core::dimension2d<s32>& screenSize,
 	else
 		os::Printer::log("GLSL not available.", ELL_INFORMATION);
 
-	// We want to read the front buffer to get the latest render finished.
-	glReadBuffer(GL_FRONT);
 	glPixelStorei(GL_PACK_ALIGNMENT, 1);
 
 	// Reset The Current Viewport
@@ -2688,7 +2686,10 @@ IImage* COpenGLDriver::createScreenShot()
 		glPixelStorei(GL_PACK_INVERT_MESA, GL_TRUE);
 #endif
 
+	// We want to read the front buffer to get the latest render finished.
+	glReadBuffer(GL_FRONT);
 	glReadPixels(0, 0, ScreenSize.Width, ScreenSize.Height, GL_RGB, GL_UNSIGNED_BYTE, pPixels);
+	glReadBuffer(GL_BACK);
 
 #ifdef GL_MESA_pack_invert
 	if (FeatureAvailable[IRR_MESA_pack_invert])