Method CropRenderSize

neo/renderer/RenderSystem.cpp:776–849

================ CropRenderSize This automatically halves sizes until it fits in the current window size, so if you specify a power of two size for a texture copy, it may be shrunk down, but still valid. ================ */

================
*/
void	idRenderSystemLocal::CropRenderSize( int width, int height, bool makePowerOfTwo, bool forceDimensions ) {
	if ( !glConfig.isInitialized ) {
		return;
	}

	// close any gui drawing before changing the size
	guiModel->EmitFullScreen();
	guiModel->Clear();

	if ( width < 1 || height < 1 ) {
		common->Error( "CropRenderSize: bad sizes" );
	}

	if ( session->writeDemo ) {
		session->writeDemo->WriteInt( DS_RENDER );
		session->writeDemo->WriteInt( DC_CROP_RENDER );
		session->writeDemo->WriteInt( width );
		session->writeDemo->WriteInt( height );
		session->writeDemo->WriteInt( makePowerOfTwo );

		if ( r_showDemo.GetBool() ) {
			common->Printf( "write DC_CROP_RENDER\n" );
		}
	}

	// convert from virtual SCREEN_WIDTH/SCREEN_HEIGHT coordinates to physical OpenGL pixels
	renderView_t renderView;
	renderView.x = 0;
	renderView.y = 0;
	renderView.width = width;
	renderView.height = height;

	idScreenRect	r;
	RenderViewToViewport( &renderView, &r );

	width = r.x2 - r.x1 + 1;
	height = r.y2 - r.y1 + 1;

	if ( forceDimensions ) {
		// just give exactly what we ask for
		width = renderView.width;
		height = renderView.height;
	}

	// if makePowerOfTwo, drop to next lower power of two after scaling to physical pixels
	if ( makePowerOfTwo ) {
		width = RoundDownToPowerOfTwo( width );
		height = RoundDownToPowerOfTwo( height );
		// FIXME: megascreenshots with offset viewports don't work right with this yet
	}

	renderCrop_t	*rc = &renderCrops[currentRenderCrop];

	// we might want to clip these to the crop window instead
	while ( width > glConfig.vidWidth ) {
		width >>= 1;
	}
	while ( height > glConfig.vidHeight ) {