fixed a bug where opengl scissor tests were not disabled after drawing 2d...

fixed a bug where opengl scissor tests were not disabled after drawing 2d images with an invalid clipping rectangle.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@796 dfc29bdd-3216-0410-991c-e03cc46cb475

source/Irrlicht/COpenGLDriver.cpp

@@ -815,6 +815,9 @@ void COpenGLDriver::draw2DImage(video::ITexture* texture,
 	glColor4ub(color.getRed(), color.getGreen(), color.getBlue(), color.getAlpha());
 	if (clipRect)
 	{
+		if (!clipRect->isValid())
+			return;
+
 		glEnable(GL_SCISSOR_TEST);
 		glScissor(clipRect->UpperLeftCorner.X,renderTargetSize.Height-clipRect->LowerRightCorner.Y,
 			clipRect->getWidth(),clipRect->getHeight());
@@ -913,6 +916,9 @@ void COpenGLDriver::draw2DImage(video::ITexture* texture, const core::rect<s32>&
 
 	if (clipRect)
 	{
+		if (!clipRect->isValid())
+			return;
+
 		glEnable(GL_SCISSOR_TEST);
 		glScissor(clipRect->UpperLeftCorner.X,renderTargetSize.Height-clipRect->LowerRightCorner.Y,
 			clipRect->getWidth(),clipRect->getHeight());