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+/************************************************************************************
+
+Filename    :   CAPI_DistortionRenderer.h
+Content     :   Abstract interface for platform-specific rendering of distortion
+Created     :   February 2, 2014
+Authors     :   Michael Antonov
+
+Copyright   :   Copyright 2014 Oculus VR, Inc. All Rights reserved.
+
+Licensed under the Oculus VR Rift SDK License Version 3.1 (the "License"); 
+you may not use the Oculus VR Rift SDK except in compliance with the License, 
+which is provided at the time of installation or download, or which 
+otherwise accompanies this software in either electronic or hard copy form.
+
+You may obtain a copy of the License at
+
+http://www.oculusvr.com/licenses/LICENSE-3.1 
+
+Unless required by applicable law or agreed to in writing, the Oculus VR SDK 
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+
+************************************************************************************/
+
+#ifndef OVR_CAPI_DistortionRenderer_h
+#define OVR_CAPI_DistortionRenderer_h
+
+#include "CAPI_HMDRenderState.h"
+#include "CAPI_FrameTimeManager.h"
+
+
+namespace OVR { namespace CAPI {
+
+//-------------------------------------------------------------------------------------
+// ***** CAPI::DistortionRenderer
+
+// DistortionRenderer implements rendering of distortion and other overlay elements
+// in platform-independent way.
+// Platform-specific renderer back ends for CAPI are derived from this class.
+
+class  DistortionRenderer : public RefCountBase<DistortionRenderer>
+{
+    // Quiet assignment compiler warning.
+    void operator = (const DistortionRenderer&) { }
+public:
+    
+    DistortionRenderer(ovrRenderAPIType api, ovrHmd hmd,
+                       FrameTimeManager& timeManager,              
+                       const HMDRenderState& renderState)
+        : RenderAPI(api), HMD(hmd), TimeManager(timeManager), RState(renderState)
+    { }
+    virtual ~DistortionRenderer()
+    { }
+    
+
+    // Configures the Renderer based on externally passed API settings. Must be
+    // called before use.
+    // Under D3D, apiConfig includes D3D Device pointer, back buffer and other
+    // needed structures.
+    virtual bool Initialize(const ovrRenderAPIConfig* apiConfig,
+                            unsigned hmdCaps, unsigned distortionCaps) = 0;
+
+    // Submits one eye texture for rendering. This is in the separate method to
+    // allow "submit as you render" scenarios on horizontal screens where one
+    // eye can be scanned out before the other.
+    virtual void SubmitEye(int eyeId, ovrTexture* eyeTexture) = 0;
+
+    // Finish the frame, optionally swapping buffers.
+    // Many implementations may actually apply the distortion here.
+    virtual void EndFrame(bool swapBuffers, unsigned char* latencyTesterDrawColor,
+                                            unsigned char* latencyTester2DrawColor) = 0;
+    
+
+
+    // *** Creation Factory logic
+    
+    ovrRenderAPIType GetRenderAPI() const { return RenderAPI; }
+
+    // Creation function for this interface, registered for API.
+    typedef DistortionRenderer* (*CreateFunc)(ovrHmd hmd,
+                                              FrameTimeManager &timeManager,
+                                              const HMDRenderState& renderState);
+
+    static CreateFunc APICreateRegistry[ovrRenderAPI_Count];
+
+protected:
+    const ovrRenderAPIType  RenderAPI;
+    const ovrHmd            HMD;
+    FrameTimeManager&       TimeManager;
+    const HMDRenderState&   RState;    
+};
+
+}} // namespace OVR::CAPI
+
+
+#endif // OVR_CAPI_DistortionRenderer_h
+
+