Fixed two places which would create an glError and increased extension check performance.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@851 dfc29bdd-3216-0410-991c-e03cc46cb475

source/Irrlicht/CIrrDeviceWin32.h

@@ -55,8 +55,8 @@ namespace irr
 		//! notifies the device that it should close itself
 		virtual void closeDevice();
 
-		//! \return Returns a pointer to a list with all video modes supported
-		//! by the gfx adapter.
+		//! \return Returns a pointer to a list with all video modes
+		//! supported by the gfx adapter.
 		video::IVideoModeList* getVideoModeList();
 
 		//! Notifies the device, that it has been resized

source/Irrlicht/COpenGLDriver.cpp

@@ -1145,7 +1145,8 @@ void COpenGLDriver::setRenderStates3DMode()
 	if (CurrentRenderMode != ERM_3D)
 	{
 		// Reset Texture Stages
-		glTexEnvi( GL_TEXTURE_ENV, GL_COMBINE_ALPHA_ARB, GL_MODULATE );
+		if (FeatureAvailable[IRR_ARB_texture_env_combine])
+			glTexEnvi( GL_TEXTURE_ENV, GL_COMBINE_ALPHA_ARB, GL_MODULATE );
 		glDisable(GL_ALPHA_TEST);
 		glDisable( GL_BLEND );
 		glBlendFunc( GL_ONE, GL_ONE_MINUS_SRC_COLOR );
@@ -1953,7 +1954,8 @@ void COpenGLDriver::setFog(SColor c, bool linearFog, f32 start,
 
 	glFogi(GL_FOG_MODE, linearFog ? GL_LINEAR : GL_EXP);
 #ifdef GL_EXT_fog_coord
-	glFogi(GL_FOG_COORDINATE_SOURCE, GL_FRAGMENT_DEPTH);
+	if (FeatureAvailable[IRR_EXT_fog_coord])
+		glFogi(GL_FOG_COORDINATE_SOURCE, GL_FRAGMENT_DEPTH);
 #endif
 
 	if(linearFog)

source/Irrlicht/COpenGLExtensionHandler.cpp

@@ -92,8 +92,13 @@ void COpenGLExtensionHandler::initExtensions(bool stencilBuffer)
 			{
 				str[i] = 0;
 				for (u32 i=0; i<IRR_OpenGL_Feature_Count; ++i)
+				{
 					if (strstr(p, OpenGLFeatureStrings[i]))
+					{
 						FeatureAvailable[i] = true;
+						break;
+					}
+				}
 
 				p = p + strlen(p) + 1;
 			}