/**
* Creates necessary resources to render a window and sends draw commands to the rendering thread
*
* @param WindowDrawBuffer The buffer containing elements to draw
*/
void FSlateOpenGLRenderer::DrawWindows( FSlateDrawBuffer& InWindowDrawBuffer )
{
// Update the font cache with new text before elements are batched
FontCache->UpdateCache();
// Draw each window. For performance. All elements are batched before anything is rendered
TArray<FSlateWindowElementList>& WindowElementLists = InWindowDrawBuffer.GetWindowElementLists();
for( int32 ListIndex = 0; ListIndex < WindowElementLists.Num(); ++ListIndex )
{
FSlateWindowElementList& ElementList = WindowElementLists[ListIndex];
if ( ElementList.GetWindow().IsValid() )
{
TSharedRef<SWindow> WindowToDraw = ElementList.GetWindow().ToSharedRef();
const FVector2D WindowSize = WindowToDraw->GetSizeInScreen();
FSlateOpenGLViewport* Viewport = WindowToViewportMap.Find( &WindowToDraw.Get() );
check(Viewport);
//@todo Slate OpenGL: Move this to ResizeViewport
if( WindowSize.X != Viewport->ViewportRect.Right || WindowSize.Y != Viewport->ViewportRect.Bottom )
{
//@todo implement fullscreen
const bool bFullscreen = false;
Private_ResizeViewport( WindowSize, *Viewport, bFullscreen );
}
Viewport->MakeCurrent();
// Batch elements. Note that we must set the current viewport before doing this so we have a valid rendering context when calling OpenGL functions
ElementBatcher->AddElements( ElementList.GetDrawElements() );
//@ todo Slate: implement for opengl
bool bRequiresStencilTest = false;
ElementBatcher->FillBatchBuffers( ElementList, bRequiresStencilTest );
ElementBatcher->ResetBatches();
RenderingPolicy->UpdateBuffers( ElementList );
check(Viewport);
glViewport( Viewport->ViewportRect.Left, Viewport->ViewportRect.Top, Viewport->ViewportRect.Right, Viewport->ViewportRect.Bottom );
// Draw all elements
RenderingPolicy->DrawElements( ViewMatrix*Viewport->ProjectionMatrix, ElementList.GetRenderBatches() );
Viewport->SwapBuffers();
// Reset all batch data for this window
ElementBatcher->ResetBatches();
}
}
FontCache->ConditionalFlushCache();
}
void FSlateOpenGLRenderer::UpdateFullscreenState( const TSharedRef<SWindow> InWindow, uint32 OverrideResX, uint32 OverrideResY )
{
FSlateOpenGLViewport* Viewport = WindowToViewportMap.Find( &InWindow.Get() );
if( Viewport )
{
bool bFullscreen = IsViewportFullscreen( *InWindow );
// todo: support Fullscreen modes in OpenGL
// uint32 ResX = OverrideResX ? OverrideResX : GSystemResolution.ResX;
// uint32 ResY = OverrideResY ? OverrideResY : GSystemResolution.ResY;
Private_ResizeViewport( FVector2D( Viewport->ViewportRect.Right, Viewport->ViewportRect.Bottom ), *Viewport, bFullscreen );
}
}
void FSlateD3DRenderer::RequestResize( const TSharedPtr<SWindow>& InWindow, uint32 NewSizeX, uint32 NewSizeY )
{
const bool bFullscreen = IsViewportFullscreen( *InWindow );
Private_ResizeViewport( InWindow.ToSharedRef(), NewSizeX, NewSizeY, bFullscreen );
}
