Merge ec592390e7 into 9cd7b34a77

internal/graphicsdriver/directx/graphics12_windows.go

@@ -44,7 +44,9 @@ type graphics12 struct {
 	device                 *_ID3D12Device
 	commandQueue           *_ID3D12CommandQueue
 	rtvDescriptorHeap      *_ID3D12DescriptorHeap
+	rtvEmptyDescriptorHeap *_ID3D12DescriptorHeap
 	rtvDescriptorSize      uint32
+	emptyRenderTarget      *_ID3D12Resource
 	renderTargets          [frameCount]*_ID3D12Resource
 	framePipelineToken     _D3D12XBOX_FRAME_PIPELINE_TOKEN
 
@@ -418,6 +420,34 @@ func (g *graphics12) initializeMembers(frameIndex int) (ferr error) {
 			g.rtvDescriptorHeap = nil
 		}
 	}()
+
+	// Create a descriptor heap for empty RTV in case of MRT with empty locations.
+	h, err = g.device.CreateDescriptorHeap(&_D3D12_DESCRIPTOR_HEAP_DESC{
+		Type:           _D3D12_DESCRIPTOR_HEAP_TYPE_RTV,
+		NumDescriptors: frameCount,
+		Flags:          _D3D12_DESCRIPTOR_HEAP_FLAG_NONE,
+		NodeMask:       0,
+	})
+	if err != nil {
+		return err
+	}
+	g.rtvEmptyDescriptorHeap = h
+	defer func() {
+		if ferr != nil {
+			g.rtvEmptyDescriptorHeap.Release()
+			g.rtvEmptyDescriptorHeap = nil
+		}
+	}()
+	hnd, err := g.rtvEmptyDescriptorHeap.GetCPUDescriptorHandleForHeapStart()
+	if err != nil {
+		return err
+	}
+	// Create an empty render target for empty destinations at DrawTriangles
+	g.device.CreateRenderTargetView(nil, &_D3D12_RENDER_TARGET_VIEW_DESC{
+		Format:        _DXGI_FORMAT_R8G8B8A8_UNORM,
+		ViewDimension: _D3D12_RTV_DIMENSION_TEXTURE2D,
+	}, hnd)
+
 	g.rtvDescriptorSize = g.device.GetDescriptorHandleIncrementSize(_D3D12_DESCRIPTOR_HEAP_TYPE_RTV)
 
 	if err := g.pipelineStates.initialize(g.device); err != nil {
@@ -1090,20 +1120,15 @@ func (g *graphics12) setAsRenderTargets(dsts []*image12, useStencil bool) error
 		// Ignore a nil image in case of MRT
 		if img == nil {
 			_ = i
-			rtvBase, err := g.rtvDescriptorHeap.GetCPUDescriptorHandleForHeapStart()
+			rtv, err := g.rtvEmptyDescriptorHeap.GetCPUDescriptorHandleForHeapStart()
 			if err != nil {
 				return err
 			}
-			rtv := rtvBase
 			rtv.Offset(int32(g.frameIndex), g.rtvDescriptorSize)
 			rtvs = append(rtvs, rtv)
 			continue
 		}
 
-		if err := img.ensureRenderTargetView(g.device); err != nil {
-			return err
-		}
-
 		if img.screen {
 			if useStencil {
 				return fmt.Errorf("directx: stencils are not available on the screen framebuffer")
@@ -1119,6 +1144,10 @@ func (g *graphics12) setAsRenderTargets(dsts []*image12, useStencil bool) error
 			continue
 		}
 
+		if err := img.ensureRenderTargetView(g.device); err != nil {
+			return err
+		}
+
 		rtvBase, err := img.rtvDescriptorHeap.GetCPUDescriptorHandleForHeapStart()
 		if err != nil {
 			return err

internal/graphicsdriver/directx/pipeline12_windows.go

@@ -510,7 +510,8 @@ func (p *pipelineStates) newPipelineState(device *_ID3D12Device, vsh, psh *_ID3D
 			AlphaToCoverageEnable:  0,
 			IndependentBlendEnable: 0,
 			RenderTarget: [8]_D3D12_RENDER_TARGET_BLEND_DESC{
-				rtBlendDesc, // TODO: need to fill them all?
+				rtBlendDesc, rtBlendDesc, rtBlendDesc, rtBlendDesc,
+				rtBlendDesc, rtBlendDesc, rtBlendDesc, rtBlendDesc, // TODO: need to fill them all?
 			},
 		},
 		SampleMask: math.MaxUint32,