Some driver cleanup. Fixed the issues with external window usage under OpenGL...

Some driver cleanup. Fixed the issues with external window usage under OpenGL and Linux. Added error checking for VBO usage.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@1443 dfc29bdd-3216-0410-991c-e03cc46cb475

source/Irrlicht/COpenGLDriver.h

@@ -393,6 +393,8 @@ namespace video
 			HDC HDc; // Private GDI Device Context
 			HWND Window;
 			HGLRC HRc; // Permanent Rendering Context
+		#elif defined(_IRR_USE_LINUX_DEVICE_)
+			GLXDrawable Drawable;
 		#elif defined(_IRR_USE_OSX_DEVICE_)
 			CIrrDeviceMacOSX *_device;
 		#endif

source/Irrlicht/COpenGLMaterialRenderer.h

@@ -91,7 +91,7 @@ public:
 		Driver->setTexture(0, material.getTexture(0));
 		Driver->setBasicRenderStates(material, lastMaterial, resetAllRenderstates);
 
-		if (material.MaterialType != lastMaterial.MaterialType || resetAllRenderstates)
+		if (resetAllRenderstates || (material.MaterialType != lastMaterial.MaterialType))
 		{
 			// thanks to Murphy, the following line removed some
 			// bugs with several OpenGL implementations.

source/Irrlicht/COpenGLTexture.cpp

@@ -406,7 +406,7 @@ const core::dimension2d<s32>& COpenGLTexture::getOriginalSize() const
 }
 
 
-//! Returns of the texture.
+//! Returns size of the texture.
 const core::dimension2d<s32>& COpenGLTexture::getSize() const
 {
 	if (Image)
@@ -501,7 +501,7 @@ bool COpenGLTexture::isRenderTarget() const
 }
 
 
-void COpenGLTexture::setRenderTarget(bool isTarget)
+void COpenGLTexture::setIsRenderTarget(bool isTarget)
 {
     IsRenderTarget = isTarget;
 }

source/Irrlicht/COpenGLTexture.h

@@ -99,7 +99,7 @@ public:
 	void unbindFrameBufferObject();
 
 	//! sets whether this texture is intended to be used as a render target.
-	void setRenderTarget(bool isTarget);
+	void setIsRenderTarget(bool isTarget);
 
 private: