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我使用SlimDX，針對DirectX 11與着色器模型4.我有一個像素着色「preProc」，它處理我的頂點並保存三個數據紋理。一個用於每像素法線，一個用於每像素位置數據，一個用於顏色和深度（顏色佔用rgb，深度佔用alpha通道）。多個渲染目標不保存數據
然後，我後來在後處理着色器中使用這些紋理來實現屏幕空間環境光遮擋，但似乎沒有數據在第一個着色器中保存。
這裏是我的像素着色器：
其輸出以下結構：
struct PS_OUT
{
float4 col : SV_TARGET0;
float4 norm : SV_TARGET1;
float4 pos : SV_TARGET2;
};
，並採取下面的結構輸入：
struct PS_IN
{
float4 pos : SV_POSITION;
float2 tex : TEXCOORD0;
float3 norm : TEXCOORD1;
};
但是在我的後處理着色器：
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));
}
它只是輸出一個淺藍色的屏幕（我在每幀開始時重置渲染目標的顏色）。只有在處理一個渲染目標時，getCol已經過測試才能工作，並從renderTex材質返回顏色。如果我將pixelshader改爲採樣randomTex紋理（我的代碼以前從文件加載並且不是渲染目標），則所有渲染效果都很好，因此我相信這不是我的後期處理着色器。
在情況下，它是一個的失敗在這裏我slimDX代碼是我做的：
創建我的紋理，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);
}
渲染我多渲染目標：
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();
}
然後當我將後處理着色器渲染到屏幕時的功能：
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();
}
編輯：我已經添加了PIX函數調用輸出當前運行的單個幀：
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：我一直在做一些閱讀，也許我在我將它們作爲ShaderResourceViews傳遞給我的postProcess着色器之前，需要在preProc傳遞之後將紋理解除分配爲渲染目標。我假定調用context.OutputMerger.SetTargets（）將取消分配所有當前分配的渲染目標，然後只分配函數參數中指定的渲染目標。如果情況並非如此（我還不能確定它是否是），那麼我將如何去取消分配SlimDX中的渲染目標？
EDIT3：嗯，根據本MSDN Page，呼籲OutputMerger.SetRenderTargets（）「將覆蓋所有有界渲染目標和深度模具目標無論ppRenderTargetViews渲染目標的數量。」因此當我告訴OutputMerger渲染到屏幕時，所有渲染目標都會自動釋放。這讓我回到原點。