directx - 多个渲染目标不保存数据

Question

我正在使用 SlimDX，针对带有着色器模型 4 的 DirectX 11。我有一个像素着色器“preProc”，它处理我的顶点并保存三个数据纹理。一种用于每像素法线，一种用于每像素位置数据，一种用于颜色和深度(颜色占用 rgb，深度占用 alpha channel )。

然后我稍后在后处理着色器中使用这些纹理以实现屏幕空间环境光遮蔽，但是似乎没有任何数据保存在第一个着色器中。

这是我的像素着色器:

PS_OUT PS( PS_IN input )
{
    PS_OUT output;
    output.col = float4(0,0,0,0);
    output.norm = float4(input.norm,1);
    output.pos = input.pos;
    return output;
}

它输出以下结构:

struct PS_OUT
{
    float4 col : SV_TARGET0;
    float4 norm : SV_TARGET1;
    float4 pos : SV_TARGET2;
};

并采用以下结构作为输入:

struct PS_IN
{
    float4 pos : SV_POSITION;
    float2 tex : TEXCOORD0;
    float3 norm : TEXCOORD1;
};

但是在我的后处理着色器中:

Texture2D renderTex : register(t1);
Texture2D normalTex : register(t2);
Texture2D positionTex : register(t3);
Texture2D randomTex : register(t4);
SamplerState samLinear : register(s0);

float4 PS(PS_IN input) : SV_Target
{
    return float4(getCol(input.tex));
}

它只是输出一个浅蓝色屏幕(我在每帧开始时将渲染目标重置为该颜色)。 getCol 已经过测试，可以在仅处理一个渲染目标时从 renderTex Material 返回一种颜色。如果我将像素着色器改为对 randomTex 纹理(我的代码之前从文件加载并且不是渲染目标)进行采样，则一切都可以正常渲染，因此我确信它不是我的后期处理着色器。

如果我的 slimDX 代码失败了，我会这样做:

创建我的纹理、shaderresourvecviews 和 rendertargetviews:

Texture2DDescription textureDescription = new Texture2DDescription()
                {
                    Width=texWidth,
                    Height=texHeight,
                    MipLevels=1,
                    ArraySize=3,
                    Format=SlimDX.DXGI.Format.R32G32B32A32_Float,
                    SampleDescription = new SlimDX.DXGI.SampleDescription(1,0),
                    BindFlags = BindFlags.RenderTarget | BindFlags.ShaderResource,
                    CpuAccessFlags= CpuAccessFlags.None,
                    OptionFlags = ResourceOptionFlags.None,
                    Usage= ResourceUsage.Default,
                };
            texture = new Texture2D(device, textureDescription);

            renderTargetView = new RenderTargetView[3];
            shaderResourceView = new ShaderResourceView[3];

            for (int i = 0; i < 3; i++)
            {
                RenderTargetViewDescription renderTargetViewDescription = new RenderTargetViewDescription()
                    {
                        Format = textureDescription.Format,
                        Dimension = RenderTargetViewDimension.Texture2D,
                        MipSlice = 0,
                    };

                renderTargetView[i] = new RenderTargetView(device, texture, renderTargetViewDescription);

                ShaderResourceViewDescription shaderResourceViewDescription = new ShaderResourceViewDescription()
                    {
                        Format = textureDescription.Format,
                        Dimension = ShaderResourceViewDimension.Texture2D,
                        MostDetailedMip = 0,
                        MipLevels = 1
                    };

                shaderResourceView[i] = new ShaderResourceView(device, texture, shaderResourceViewDescription);
            }

渲染到我的多个渲染目标:

private void renderToTexture(Shader shader)
    {
        //set the vertex and pixel shaders
        context.VertexShader.Set(shader.VertexShader);
        context.PixelShader.Set(shader.PixelShader);

        //send texture data and a linear sampler to the shader
        context.PixelShader.SetShaderResource(texture, 0);
        context.PixelShader.SetSampler(samplerState, 0);

        //set the input assembler
        SetInputAssembler(shader);

        //reset the camera's constant buffer
        camera.ResetConstantBuffer();

        //set the render targets to the textures we will render to
        context.OutputMerger.SetTargets(depthStencilView, renderTargetViews);
        //clear the render targets and depth stencil
        foreach (RenderTargetView view in renderTargetViews)
        {
             context.ClearRenderTargetView(view, color);
        }
        context.ClearDepthStencilView(depthStencilView, DepthStencilClearFlags.Depth, 1.0f, 0);
            //draw the scene
            DrawScene();

        }

然后是将 postProcessing 着色器渲染到屏幕时的函数:

private void renderTexture(Shader shader)
        {
            //get a single quad to be the screen we render
            Mesh mesh = CreateScreenFace();
            //set vertex and pixel shaders
            context.VertexShader.Set(shader.VertexShader);
            context.PixelShader.Set(shader.PixelShader);
            //set the input assembler
            SetInputAssembler(shader);
            //point the render target to the screen
            context.OutputMerger.SetTargets(depthStencil, renderTarget);
            //send the rendered textures and a linear sampler to the shader
                context.PixelShader.SetShaderResource(renderTargetViews[0], 1);
            context.PixelShader.SetShaderResource(renderTargetViews[1], 2);
            context.PixelShader.SetShaderResource(renderTargetViews[2], 3);
            context.PixelShader.SetShaderResource(random, 4);
            context.PixelShader.SetSampler(samplerState, 0);
            //clear the render targets and depth stencils
            context.ClearRenderTargetView(renderTarget, new Color4(0.52734375f, 0.8046875f, 0.9765625f));
            context.ClearDepthStencilView(depthStencil, DepthStencilClearFlags.Depth, 1, 0);
            //set the vertex and index buffers from the quad
            context.InputAssembler.SetVertexBuffers(0, new VertexBufferBinding(mesh.VertexBuffer, Marshal.SizeOf(typeof(Vertex)), 0));
            context.InputAssembler.SetIndexBuffer(mesh.IndexBuffer, Format.R16_UInt, 0);
            //draw the quad
            context.DrawIndexed(mesh.indices, 0, 0);
            //dispose of the buffers
            mesh.VertexBuffer.Dispose();
            mesh.IndexBuffer.Dispose();
        }

EDIT: I've added the PIX function call output for a single frame of the current run:

Frame 40
//setup
<0x06BDA1D8> ID3D11DeviceContext::ClearRenderTargetView(0x06B66190, 0x0028F068)
<0x06BDA1D8> ID3D11DeviceContext::ClearDepthStencilView(0x06B66138, 1, 1.000f, 0)
<0x0059FF78> ID3D11Device::CreateBuffer(0x0028F010, 0x0028EFF8, 0x0028F00C --> 0x06BF8EE0)
CreateObject(D3D11 Buffer, 0x06BF8EE0)
<0x06BDA1D8> ID3D11DeviceContext::PSSetConstantBuffers(0, 1, 0x0028F084 --> { 0x06BF8EE0 })
<0x0059FF78> ID3D11Device::CreateBuffer(0x0F8DEB58, 0x0F8DEB40, 0x0F8DEB54 --> 0x06BF8F68)
CreateObject(D3D11 Buffer, 0x06BF8F68)
<0x0059FF78> ID3D11Device::CreateBuffer(0x0F70EAD8, 0x0F70EAC0, 0x0F70EAD4 --> 0x06BF8FF0)
CreateObject(D3D11 Buffer, 0x06BF8FF0)
<0x0059FF78> ID3D11Device::CreateBuffer(0x0FAAE9A8, 0x0FAAE990, 0x0FAAE9A4 --> 0x06BF9078)
CreateObject(D3D11 Buffer, 0x06BF9078)
<0x0059FF78> ID3D11Device::GetImmediateContext(0x06BDA1D8 --> 0x5BA8A8D8)
<0x0059FF78> ID3D11Device::CreateBuffer(0x0F8DEB58, 0x0F8DEB40, 0x0F8DEB54 --> 0x06BF9100)
CreateObject(D3D11 Buffer, 0x06BF9100)
<0x0059FF78> ID3D11Device::CreateBuffer(0x0F70EAD8, 0x0F70EAC0, 0x0F70EAD4 --> 0x06BF9188)
CreateObject(D3D11 Buffer, 0x06BF9188)
<0x06BDA1D8> ID3D11DeviceContext::Release()
<0x06BDA1D8> ID3D11DeviceContext::UpdateSubresource(0x06B59270, 0, NULL, 0x06287FA0, 0, 0)
<0x0059FF78> ID3D11Device::CreateBuffer(0x0FAAE9A8, 0x0FAAE990, 0x0FAAE9A4 --> 0x06BF9210)
CreateObject(D3D11 Buffer, 0x06BF9210)
<0x06BDA1D8> ID3D11DeviceContext::VSSetShader(0x06B66298, NULL, 0)
<0x0059FF78> ID3D11Device::CreateBuffer(0x0FC0E978, 0x0FC0E960, 0x0FC0E974 --> 0x06BF9298)
CreateObject(D3D11 Buffer, 0x06BF9298)
<0x0059FF78> ID3D11Device::CreateBuffer(0x0FE8EDE8, 0x0FE8EDD0, 0x0FE8EDE4 --> 0x06BF9320)
CreateObject(D3D11 Buffer, 0x06BF9320)
<0x06BDA1D8> ID3D11DeviceContext::PSSetShader(0x06B666F8, NULL, 0)
<0x0059FF78> ID3D11Device::CreateBuffer(0x0FC0E978, 0x0FC0E960, 0x0FC0E974 --> 0x06BF93A8)
CreateObject(D3D11 Buffer, 0x06BF93A8)
<0x0059FF78> ID3D11Device::CreateBuffer(0x0FE8EDE8, 0x0FE8EDD0, 0x0FE8EDE4 --> 0x06BF9430)
CreateObject(D3D11 Buffer, 0x06BF9430)
<0x0059FF78> ID3D11Device::CreateInputLayout(0x0028EBE0, 3, 0x06286CB8, 152, 0x0028EBD8 --> 0x06BF9D68)
CreateObject(D3D11 Input Layout, 0x06BF9D68)
<0x06BDA1D8> ID3D11DeviceContext::IASetInputLayout(0x06BF9D68)
<0x06BDA1D8> ID3D11DeviceContext::IASetPrimitiveTopology(D3D11_PRIMITIVE_TOPOLOGY_TRIANGLELIST)
<0x0059FF78> ID3D11Device::GetImmediateContext(0x06BDA1D8 --> 0x5BA8A8D8)
<0x06BDA1D8> ID3D11DeviceContext::Release()
<0x06BDA1D8> ID3D11DeviceContext::VSSetConstantBuffers(0, 1, 0x0028F024 --> { 0x06B59270 })
<0x06BDA1D8> ID3D11DeviceContext::OMSetRenderTargets(3, 0x0028F004 --> { 0x06B65708, 0x06B657B8, 0x06B582E0 }, 0x06B66138)
<0x06BDA1D8> ID3D11DeviceContext::ClearRenderTargetView(0x06B65708, 0x0028EFEC)
<0x06BDA1D8> ID3D11DeviceContext::ClearRenderTargetView(0x06B657B8, 0x0028EFEC)
<0x06BDA1D8> ID3D11DeviceContext::ClearRenderTargetView(0x06B582E0, 0x0028EFEC)
<0x06BDA1D8> ID3D11DeviceContext::ClearDepthStencilView(0x06B66138, 1, 1.000f, 0)
//draw scene for preproc shader (this should output the three render targets)
//DRAW CALLS HIDDEN
<0x0059FF78> ID3D11Device::CreateBuffer(0x0028EE04, 0x0028EDEC, 0x0028EE00 --> 0x06BF94B8)
CreateObject(D3D11 Buffer, 0x06BF94B8)
<0x0059FF78> ID3D11Device::CreateBuffer(0x0028EE04, 0x0028EDEC, 0x0028EE00 --> 0x06BF9540)
CreateObject(D3D11 Buffer, 0x06BF9540)
<0x06BDA1D8> ID3D11DeviceContext::VSSetShader(0x06B66BB8, NULL, 0)
<0x06BDA1D8> ID3D11DeviceContext::PSSetShader(0x06B66E50, NULL, 0)
<0x0059FF78> ID3D11Device::CreateInputLayout(0x0028EB64, 3, 0x05E988E0, 120, 0x0028EB5C --> 0x06BF9E28)
CreateObject(D3D11 Input Layout, 0x06BF9E28)
<0x06BDA1D8> ID3D11DeviceContext::IASetInputLayout(0x06BF9E28)
<0x06BDA1D8> ID3D11DeviceContext::IASetPrimitiveTopology(D3D11_PRIMITIVE_TOPOLOGY_TRIANGLELIST)
<0x06BDA1D8> ID3D11DeviceContext::OMSetRenderTargets(1, 0x0028EFC0 --> { 0x06B66190 }, 0x06B66138)
<0x06BDA1D8> ID3D11DeviceContext::PSSetShaderResources(1, 3, 0x0028EF3C --> { 0x06B65760, 0x06B58288, 0x06B58338 })
<0x06BDA1D8> ID3D11DeviceContext::PSSetShaderResources(4, 1, 0x0028EFC0 --> { 0x06B66FA0 })
<0x06BDA1D8> ID3D11DeviceContext::ClearRenderTargetView(0x06B66190, 0x0028EFA4)
<0x06BDA1D8> ID3D11DeviceContext::ClearDepthStencilView(0x06B66138, 1, 1.000f, 0)
<0x06BDA1D8> ID3D11DeviceContext::IASetVertexBuffers(0, 1, 0x0028EFAC --> { 0x06BF94B8 }, 0x0028EFB0, 0x0028EFB4)
<0x06BDA1D8> ID3D11DeviceContext::IASetIndexBuffer(0x06BF9540, DXGI_FORMAT_R16_UINT, 0)
//draw quad for post proc shader. This shader takes the three textures in, as well as a random texture, which is added in the second PSSetShaderResources call. The random texture outputs fine.
<0x06BDA1D8> ID3D11DeviceContext::DrawIndexed(6, 0, 0)
<0x06BF94B8> ID3D11Buffer::Release()
<0x06BF9540> ID3D11Buffer::Release()
<0x06B65B00> IDXGISwapChain::Present(0, 0)

EDIT2: I've been doing some reading and perhaps I need to deallocate the textures as render targets after the preProc pass before I pass them in as ShaderResourceViews to my postProcess shader. I assumed calling context.OutputMerger.SetTargets() would deallocate all of the currently assigned render targets and then assign only the render targets specified in the function's parameters. If this isn't the case (I can't yet be sure if it is or isn't), then how would I go about unassigning the render targets in SlimDX?

EDIT3: Ah, according to this MSDN Page, calling OutputMerger.SetRenderTargets() "overrides all bounded render targets and the depth stencil target regardless of the number of render targets in ppRenderTargetViews." so all of my render targets are getting deallocated automatically when I tell the OutputMerger to render to the screen. This leaves me back to square one.

Answer 1

通过发现我是多么愚蠢来修复它。

当我创建渲染目标时，我创建了一个 Texture2DArray，但我将它视为一组 Texture2D 对象，而不是一个对象。从那以后，我更改了代码以使用 Texture2D 对象数组，并且效果很好。