wined3d: Support for single buffering.

dlls/wined3d/device.c

@@ -1152,9 +1152,6 @@ HRESULT WINAPI IWineD3DDeviceImpl_CreateAdditionalSwapChain(IWineD3DDevice* ifac
 
     D3DCREATEOBJECTINSTANCE(object, SwapChain)
 
-    /* Initialize other useful values */
-    object->presentParms.BackBufferCount = 1; /* TODO:? support for gl_aux buffers */
-
     /*********************
     * Lookup the window Handle and the relating X window handle
     ********************/
@@ -1382,6 +1379,7 @@ HRESULT WINAPI IWineD3DDeviceImpl_CreateAdditionalSwapChain(IWineD3DDevice* ifac
                              NULL /* pShared (always null)*/);
     if (object->frontBuffer != NULL)
         IWineD3DSurface_SetContainer(object->frontBuffer, (IWineD3DBase *)object);
+    if(object->presentParms.BackBufferCount > 0) {
         TRACE("calling rendertarget CB\n");
         hr = D3DCB_CreateRenderTarget((IUnknown *) This->parent,
                                 object->presentParms.BackBufferWidth,
@@ -1392,8 +1390,23 @@ HRESULT WINAPI IWineD3DDeviceImpl_CreateAdditionalSwapChain(IWineD3DDevice* ifac
                                 TRUE /* Lockable */,
                                 &object->backBuffer,
                                 NULL /* pShared (always null)*/);
-    if (object->backBuffer != NULL)
+    } else {
+        object->backBuffer = NULL;
+    }
+
+    if (object->backBuffer != NULL) {
         IWineD3DSurface_SetContainer(object->backBuffer, (IWineD3DBase *)object);
+        ENTER_GL();
+        glDrawBuffer(GL_BACK);
+        checkGLcall("glDrawBuffer(GL_BACK)");
+        LEAVE_GL();
+    } else {
+        /* Single buffering - draw to front buffer */
+        ENTER_GL();
+        glDrawBuffer(GL_FRONT);
+        checkGLcall("glDrawBuffer(GL_FRONT)");
+        LEAVE_GL();
+    }
 
     /* Under directX swapchains share the depth stencil, so only create one depth-stencil */
     if (pPresentationParameters->EnableAutoDepthStencil) {

dlls/wined3d/swapchain.c

@@ -94,19 +94,24 @@ ULONG WINAPI IWineD3DSwapChainImpl_Release(IWineD3DSwapChain *iface) {
         IWineD3DDevice_SwapChainReleased((IWineD3DDevice *)This->wineD3DDevice, iface);
 
         /* release the ref to the front and back buffer parents */
+        if(This->frontBuffer) {
             IWineD3DSurface_SetContainer(This->frontBuffer, 0);
             IWineD3DSurface_GetParent(This->frontBuffer, &bufferParent);
             IUnknown_Release(bufferParent); /* once for the get parent */
             if(IUnknown_Release(bufferParent) > 0){
                 FIXME("(%p) Something's still holding the front buffer\n",This);
             }
+        }
 
+        if(This->backBuffer) {
             IWineD3DSurface_SetContainer(This->backBuffer, 0);
             IWineD3DSurface_GetParent(This->backBuffer, &bufferParent);
             IUnknown_Release(bufferParent); /* once for the get parent */
             if(IUnknown_Release(bufferParent) > 0){
                 FIXME("(%p) Something's still holding the back buffer\n",This);
             }
+        }
+
         /* Clean up the context */
         /* check that we are the current context first */
         if(glXGetCurrentContext() == This->glCtx){