D3D12: Recursive layer support

To avoid using the same color buffer both as a shader resource and as a
render target, recursive layers add a second render target and just play
ping-pong with them. Multisampling does not need this since rendering
happens into a MS buffer while shader access uses a separate, non-MS color
buffer.

Change-Id: I6fd65318f69390d7af9ca6763d1d9fe2329780aa
Reviewed-by: Andy Nichols <andy.nichols@qt.io>

1 files changed, 3 insertions, 2 deletions

diff --git a/src/plugins/scenegraph/d3d12/qsgd3d12engine_p.h b/src/plugins/scenegraph/d3d12/qsgd3d12engine_p.h
index 47c090b34d..6deef9f06b 100644
--- a/src/plugins/scenegraph/d3d12/qsgd3d12engine_p.h
+++ b/src/plugins/scenegraph/d3d12/qsgd3d12engine_p.h
@@ -341,12 +341,13 @@ public:
     void queueTextureUpload(uint id, const QVector<QImage> &images, const QVector<QPoint> &dstPos);
     void releaseTexture(uint id);
     SIZE_T textureSRV(uint id) const;
-    void activateTexture(uint id);
+    void useTexture(uint id);
 
     uint genRenderTarget();
     void createRenderTarget(uint id, const QSize &size, const QVector4D &clearColor, uint samples);
     void releaseRenderTarget(uint id);
-    void activateRenderTargetAsTexture(uint id);
+    void useRenderTargetAsTexture(uint id);
+    uint activeRenderTarget() const;
 
     // QSGRendererInterface
     GraphicsAPI graphicsAPI() const override;