I am totally lost now. Have been trying to read the backbuffer inside a vertex shader for days with no luck whatsoever.
I'm trying to read the vertexes position from the backbuffer and it's neighboring pixels. (I'm trying to count how many black pixels are around a vertex, and if there are any color that vertex red in the pixel shader). I've created a separate ID3D11Texture2D and an SRV to go with the backBuffer. I copy the backbuffer into this SRV's resource. Bind the SRV using VSSetShaderResources but just can't seem to be able to read from it inside the vertex shader.
I will share some code here from the creation of these elements as well as include some RenderDoc screenshots that keep showing that the SRV is being bound to the VS stage and has the right texture associated with it but every Load or []operator or tex2dlod or SampleLevel(i bound a SamplerState too)
just keeps returning a single 1.0 value with the rest of the float4 never being returned, meaning i only get a float1 back. I will also include a renderdoc capture file if anyone wants to take a look.
This is a simple scene from tutorial 42 on the rastertek.com site, there is a ground plane with a cube and a sphere on it :
https://i.imgur.com/cbVC48E.gif
// Here is some code when creating the secondary texture and SRV that houses a //backBuffer
// Get the pointer to the back buffer.
result = m_swapChain->GetBuffer(0, __uuidof(ID3D11Texture2D), (LPVOID*)&backBufferPtr);
if(FAILED(result))
{
MessageBox((*(hwnd)), L"Get the pointer to the back buffer FAILED", L"Error", MB_OK);
return false;
}
// Create another texture2d that we will use to make an SRV out of, and this texture2d will be used to copy the backbuffer to so we can read it in a shader
D3D11_TEXTURE2D_DESC bbDesc;
backBufferPtr->GetDesc(&bbDesc);
bbDesc.MipLevels = 1;
bbDesc.ArraySize = 1;
bbDesc.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
bbDesc.Usage = D3D11_USAGE_DEFAULT;
bbDesc.MiscFlags = 0;
bbDesc.BindFlags = D3D11_BIND_SHADER_RESOURCE;
result = m_device->CreateTexture2D(&bbDesc, NULL, &m_backBufferTx2D);
if (FAILED(result))
{
MessageBox((*(m_hwnd)), L"Create a Tx2D for backbuffer SRV FAILED", L"Error", MB_OK);
return false;
}
D3D11_SHADER_RESOURCE_VIEW_DESC descSRV;
ZeroMemory(&descSRV, sizeof(descSRV));
descSRV.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
descSRV.ViewDimension = D3D11_SRV_DIMENSION_TEXTURE2D;
descSRV.Texture2D.MipLevels = 1;
descSRV.Texture2D.MostDetailedMip = 0;
result = GetDevice()->CreateShaderResourceView(m_backBufferTx2D, &descSRV, &m_backBufferSRV);
if (FAILED(result))
{
MessageBox((*(m_hwnd)), L"Creating BackBuffer SRV FAILED.", L"Error", MB_OK);
return false;
}
// Create the render target view with the back buffer pointer.
result = m_device->CreateRenderTargetView(backBufferPtr, NULL, &m_renderTargetView);
First I render the scene in all white and then I copy that to the SRV and bind it for the next shader that's supposed to sample it. I'm expecting to get a float4(1.0, 1.0, 1.0, 1.0) value returned when i sample the backbuffer with the vertex's on screen position
https://i.imgur.com/N9CYg8c.png
as shown on the top left in the event browser, there were three drawindexed calls for rendering everything in white and then a CopyResource.
I've selected the next (fourth) DrawIndexed and on the right side outlined in red are the inputs for this next shader clearly showing that the backBuffer has been successfully bound to the vertex shader.
And now for the part that's giving me trouble
https://i.imgur.com/ENuXk0n.png
I'm gonna be debugging this top-left vertex as shown on the screenshot,
the vertex Shader has a
Texture2D prevBackBuffer: register(t0);
written at the top
https://i.imgur.com/8cihNsq.png
When trying to sample the left neighboring pixel
this line of code returns newCoord = float2(158, 220)
when entering these pixel values in the texture view i get this pixel
https://i.imgur.com/DT72Fl1.png
so the coordinates are ok so far, and as outlined i'm expecting to get a float4(0.0, 0.0, 0.0, 1,0) returned when i sample this pixel
(I'm trying to count how many black pixels are around a vertex, and if there are any color that vertex red in the pixel shader)
AND YET, when i sample that pixel right after altering the pixel coordinates since load counts pixels from bottom left so i need
newCoord = float2(158, 379), i get this
https://i.imgur.com/8SuwOzz.png
why is this, even if it's out of range, load should return all zeros, since I'm not sure about the whole load counts from bottom left thing I tried sampling using the top left coordinates (158, 220) but end up getting 0.0, ?, ?, ?
I'm completely stumped and have no idea what to try next. I've tried using a sample state :
// Create a clamp texture sampler state description.
samplerDesc.Filter = D3D11_FILTER_MIN_MAG_MIP_LINEAR;
samplerDesc.AddressU = D3D11_TEXTURE_ADDRESS_CLAMP;
samplerDesc.AddressV = D3D11_TEXTURE_ADDRESS_CLAMP;
samplerDesc.AddressW = D3D11_TEXTURE_ADDRESS_CLAMP;
samplerDesc.MipLODBias = 0.0f;
samplerDesc.MaxAnisotropy = 1;
samplerDesc.ComparisonFunc = D3D11_COMPARISON_ALWAYS;
samplerDesc.BorderColor[0] = 0;
samplerDesc.BorderColor[1] = 0;
samplerDesc.BorderColor[2] = 0;
samplerDesc.BorderColor[3] = 0;
samplerDesc.MinLOD = 0;
samplerDesc.MaxLOD = D3D11_FLOAT32_MAX;
// Create the texture sampler state.
result = device->CreateSamplerState(&samplerDesc, &m_sampleStateClamp);
but still never get a proper float4 back when reading the texture.
Any ideas, suggestions, I'll take anything at this point.
Oh and here's a RenderDoc file of the frame i was examining :
http://www.mediafire.com/file/1bfiqdpjkau4l0n/my_capture.rdc/file
So from my experience, reading from the back buffer is not really an operation that you want to be doing in the first place. If you have to do any operation on the rendered scene, the best way to do that is to render the scene to an intermediate texture, perform the operation on that texture, then render the final scene to the back buffer. This is generally how things like dynamic shadows are done - the scene is rendered from the perspective of the light, and the resulting buffer is interpreted to get a shadow value that is then applied to the final scene (this is also why dynamic light sources are limited in commercial game engines - they're rather expensive to use).
A similar idea can be applied here. First, render the whole scene to an intermediate texture, bound as a render target view (where the pixel format is specified by you, the programmer). Next, rebind that intermediate texture as a shader resource view, and render the scene again, using the edge detection shader and the real back buffer (where the pixel format is defined by the hardware).
This, fundamentally, is what I believe the issue is - a back buffer is a device dependent resource, and its format can change depending on the hardware. Therefore, using it from a shader is not safe, as you don't always know what the format will be. A device independent resource, on the other hand, will always have the same format, and you can safely use it however you like from a shader.
I wasn't able to get sampling an SRV in the vertex shader to work
but what i was able to get working
is using a backBuffer.SampleLevel inside a compute shader
I also had to change the sampler to something like this :
D3D11_SAMPLER_DESC samplerDesc;
samplerDesc.Filter = D3D11_FILTER_MIN_MAG_MIP_POINT;
samplerDesc.AddressU = D3D11_TEXTURE_ADDRESS_BORDER;
samplerDesc.AddressV = D3D11_TEXTURE_ADDRESS_BORDER;
samplerDesc.AddressW = D3D11_TEXTURE_ADDRESS_BORDER;
samplerDesc.MipLODBias = 0.0f;
samplerDesc.MaxAnisotropy = 1;
samplerDesc.ComparisonFunc = D3D11_COMPARISON_ALWAYS;
samplerDesc.BorderColor[0] = 0.5f;
samplerDesc.BorderColor[1] = 0.5f;
samplerDesc.BorderColor[2] = 0.5f;
samplerDesc.BorderColor[3] = 0.5f;
samplerDesc.MinLOD = 0;
samplerDesc.MaxLOD = 0;
Related
I'm currently working on a D3D project and want to implement directional shadow mapping. I set everything up according to the Microsoft Guide, but it just doesn't work.
I've created a 2D texture object, a depth stencil view and a shader resource view and set them up using the following descriptions:
D3D11_TEXTURE2D_DESC shadowMapDesc;
ZeroMemory(&shadowMapDesc, sizeof(D3D11_TEXTURE2D_DESC));
shadowMapDesc.Width = width;
shadowMapDesc.Height = height;
shadowMapDesc.MipLevels = 1;
shadowMapDesc.ArraySize = 1;
shadowMapDesc.Format = DXGI_FORMAT_R24G8_TYPELESS;
shadowMapDesc.SampleDesc.Count = 1;
shadowMapDesc.SampleDesc.Quality = 0;
shadowMapDesc.Usage = D3D11_USAGE_DEFAULT;
shadowMapDesc.BindFlags = D3D11_BIND_DEPTH_STENCIL | D3D11_BIND_SHADER_RESOURCE;
shadowMapDesc.CPUAccessFlags = 0;
shadowMapDesc.MiscFlags = 0;
ID3D11Device& d3ddev = dev.getD3DDevice();
uint32_t *initData = new uint32_t[width * height];
ZeroMemory(initData, sizeof(uint32_t) * width * height);
D3D11_SUBRESOURCE_DATA data;
ZeroMemory(&data, sizeof(D3D11_SUBRESOURCE_DATA));
data.pSysMem = initData;
data.SysMemPitch = sizeof(uint32_t) * width;
data.SysMemSlicePitch = 0;
HRESULT hr = d3ddev.CreateTexture2D(&shadowMapDesc, &data, &texture_);
D3D11_DEPTH_STENCIL_VIEW_DESC depthStencilViewDesc;
ZeroMemory(&depthStencilViewDesc, sizeof(D3D11_DEPTH_STENCIL_VIEW_DESC));
depthStencilViewDesc.Format = DXGI_FORMAT_D24_UNORM_S8_UINT;
depthStencilViewDesc.ViewDimension = D3D11_DSV_DIMENSION_TEXTURE2D;
depthStencilViewDesc.Texture2D.MipSlice = 0;
hr = d3ddev.CreateDepthStencilView(texture_, &depthStencilViewDesc, &stencilView_);
D3D11_SHADER_RESOURCE_VIEW_DESC shaderResourceViewDesc;
ZeroMemory(&shaderResourceViewDesc, sizeof(D3D11_SHADER_RESOURCE_VIEW_DESC));
shaderResourceViewDesc.Format = DXGI_FORMAT_R24_UNORM_X8_TYPELESS;
shaderResourceViewDesc.ViewDimension = D3D11_SRV_DIMENSION_TEXTURE2D;
shaderResourceViewDesc.Texture2D.MipLevels = 1;
shaderResourceViewDesc.Texture2D.MostDetailedMip = 0;
hr = d3ddev.CreateShaderResourceView(texture_, &shaderResourceViewDesc, &shaderView_);
Between these steps there is additional error checking, but all the create-functions return successfully. I then bind the texture, render my scene and unbind the texture using the following functions:
void D3DDepthTexture2D::bindAsTarget(D3DDevice& dev)
{
dev.getDeviceContext().ClearDepthStencilView(stencilView_, D3D11_CLEAR_DEPTH | D3D11_CLEAR_STENCIL, 1.0f, 0);
// Bind target
dev.getDeviceContext().OMSetRenderTargets(0, 0, stencilView_);
// Set viewport
dev.setViewport(static_cast<float>(width_), static_cast<float>(height_), 0.0f, 0.0f);
}
void D3DDepthTexture2D::unbindAsTarget(D3DDevice& dev, float width, float height)
{
// Unbind target
dev.resetRenderTarget();
// Reset viewport
dev.setViewport(width, height, 0.0f, 0.0f);
}
My render-to-depth-texture routine basically looks like this (removing all the unnecessary details):
camera = buildCameraFromLight(light);
setCameraCBuffer(camera);
bindTexture();
activateShader();
for(Object j : objects) {setTransformationCBuffer(j); renderObject(j);}
deactivateShader();
unbindTexture();
Rendering the scene from the light's perspective to the normal render target (screen) results in the proper image (both the actual image and just rendering the depth values). I use a simple vertex shader that just transforms the vertices and a pixel shader that does nothing at all OR returns the depth values (I tried both, doesn't change anything about the end result since we don't care about the color buffer).
After clearing the texture and rendering to it, I render it onto a quad to my screen, but all I get is a red square - so the depth value is 1.0f, the value I've cleared the texture to. I'm really at a loss for what to do, I tried everything, implemented every possible solution from online tutorials or changed things around on my own, but nothing helps. Here's a list of all the things I already checked:
All FAILED(hr)-calls return false, no error message is printed to the console
I tested whether the geometry gets transformed properly by rendering the geometry and their depth values (z / w) to screen, which worked and looked correct
I tested calculating the depth values in the fragment shader and rendering to a normal render target (basically trying to render my color buffer to texture) instead of a depth stencil texture, but that didn't work either, red square
I tested different formats and format combinations for the shadow map and the views, which either caused the creation to fail or didn't change a thing
I checked whether any call between setting and unsetting my texture as the render target during the render call resetted the depth stencil target to something else - not the case
I debugged my texture-to-screen/quad rendering routine already and it works properly with other textures, so I am in fact seeing what the depth texture looks like
I changed the geometry and camera perspective around to see whether that makes anything visible in the depth texture - it doesn't
I came across this similar StackOverflow problem and checked whether my default depth stencil buffer had the same dimensions, AA settings etc. as my texture - and it does (count 1, quality 0)
I really don't know what's up, I've been trying to debug this for hours and hours. I hope someone here can give me any advice on what I'm doing wrong or what I could try to fix this. I'm using C++11 with Direct3D11.
Note: I can't debug any of this using NSight or any Visual Studio tools since they don't seem to work properly with my system right now and I don't have any administrative rights to fix any of it. I just have to deal with it for now. I hope the given information and code samples are enough to provide a rough idea of what I could also try to make this work.
Thanks in advance.
I got NSight to work and debugged the whole thing with that. Turns out the depth texture was properly created and filled with the depth and stencil data and I just forgot that all the depth information is stored in the first channel - so I ignored the g and b data and used 1.0 for a and it worked. Using the g and b channels somehow made the whole thing red (maybe someone wants to add to this and explain why).
Debugging this got much easier once I could observe the texture that is present in the shader - I should've used a debugging tool like NSight or RenderDoc way earlier. Thanks to #EgorShkorov for the advice.
I am thinking to achieve it in the pixel shader.Here is part of my code:
Firstly, I create a Texture1D as a color table
D3D11_TEXTURE1D_DESC t1d;
t1d.Width = ModelInfo::ColorCount;
t1d.ArraySize = 1;
t1d.MipLevels = 1;
t1d.CPUAccessFlags = 0;
t1d.MiscFlags = 0;
t1d.Format = DXGI_FORMAT_R32G32B32A32_FLOAT;
t1d.Usage = D3D11_USAGE_DEFAULT;
t1d.BindFlags = D3D11_BIND_SHADER_RESOURCE;
ZeroMemory(&InitData, sizeof(InitData));
InitData.pSysMem = ModelInfo::Colors;
hr = m_D3DDevice->CreateTexture1D(&t1d, &InitData, &m_ColorTable);
if (FAILED(hr))
return hr;
D3D11_SHADER_RESOURCE_VIEW_DESC viewDesc;
viewDesc.Format = DXGI_FORMAT_R32G32B32A32_FLOAT;
viewDesc.ViewDimension = D3D11_SRV_DIMENSION_TEXTURE1D;
viewDesc.Texture1D.MostDetailedMip = 0;
viewDesc.Texture1D.MipLevels = 1;
hr = m_D3DDevice->CreateShaderResourceView(m_ColorTable, &viewDesc, &m_ColorResView);
if (FAILED(hr))
return hr;
And then I pass it to the Pixel shader
m_ImmediateContext->PSSetShaderResources(0, 1, &m_ColorResView);
In the pixel shader, i use this color table like this:
Texture1D RandomTex : register(t0);
float4 PS(VS_OUTPUT Input, uint Primitive : SV_PrimitiveID) : SV_Target
{
uint Index = Primitive % ColorCount.x;
return RandomTex[Index];
}
I want to use the alpha channel of each color in this color table to count how many times the color used during whole Pixel Shader Stage...
I want to to modify the color table in the pixel shader just like the code below.But it seem to be infeasible.
RandomTex[Index].a = RandomTex[Index].a + 1;
I have been finding a way to count the color efficiently rather than render it on a texture and count in on cpu using c++.
All method I have thought has to do some extra counting work on cpu because I find it is hard to do the operation like x++(maybe some parallel problem on gpu),besides those method that I thought need to render the texture twice which might be slower that counting it on cpu straightly.
I am digging into it for a long time.But no use.Please help or try to give some ideas how to achieve this.
You can attach a small write buffer to your pixel shader (with an unordered view), and use atomic operations in the pixel shader.
Here is the modified HLSL code
Texture1D RandomTex : register(t0);
RWStructuredBuffer<uint> RWColorCountData : register(u1);
float4 PS(VS_OUTPUT Input, uint Primitive : SV_PrimitiveID) : SV_Target
{
uint Index = Primitive % ColorCount.x;
InterlockedAdd(RWColorCountData[Index], 1);
return RandomTex[Index];
}
Here I use a StructuredBuffer, but you can also use a ByteAddressBuffer if you prefer. Also note that resource is attached to register u1, as first slot is still taken by your render target.
Your write buffer should have the same element count as your 1d texture, and needs to be attached to the pipeline (on top of the render target), with OMSetRenderTargetsAndUnorderedAccessViews
Every frame, you will also need to clear your buffer back to 0 (if required), otherwise, values will increment over time, for this you can use ClearUnorderedAccessViewUint
Please note in your case, as you are using a uint buffer and the function expects UINT Values[4], only Values[0] will be used as clear value.
I am trying to render a texture that gets passed through a pixel shader.
Currently my shader is as follows:
float4 EffectProcess( float2 Tex : TEXCOORD0 ) : COLOR0
{
return float4(1,0,0,1);
}
technique MyTechnique
{
pass p0
{
VertexShader = null;
PixelShader = compile ps_2_0 EffectProcess();
}
}
As you can see, it is a very basic shader that makes that forces the pixels to be red.
UINT uiPasses = 0;
res= g_lpEffect->Begin(&uiPasses, 0);
for (UINT uiPass = 0; uiPass < uiPasses; uiPass++)
{
res = g_lpEffect->BeginPass(uiPass);
res = sprite->Begin(D3DXSPRITE_SORT_TEXTURE);
res = sprite->Draw(tex, NULL, 0x0, 0x0, 0xFFFFFFFF);
res = sprite->End();
res = g_lpEffect->EndPass();
}
res = g_lpEffect->End();
And I am drawing the texture using the shader like so. I am not sure this is the correct way to do it though and have found very little resources on the subject.
The shader is being created correctly and the texture aswell, all calls return a hresult of S_OK, yet when I run the code, the texture shows perfectly, without being overwritten by red.
Both sprite and effects by default store initial pipeline state and set up their own when Begin is called and then restore it when End is called. So I suspect that sprite->Begin(D3DXSPRITE_SORT_TEXTURE); will disable effect processing and your pixel shader is never called. You may try to pass something like D3DXSPRITE_DONOTMODIFY_RENDERSTATE into Begin to prevent it from modifying pipeline state, though this may break sprite rendering. It would be better to get rid of sprite altogether and write your own sprite shader (both vertex and pixel) because fixed pipeline rendering is mostly deprecated these days.
I'm trying to render to texture, but the texture is stenciling out the opposite to what I want it to do. i.e. The clear colour is saved out and rendered, while the actual object I want to render is alpha'd out.
//Set the render target
RenderToTexture(RENDERTEXTURE_PARTICLESTAGE);
//Draw the scene (using the new render target)
m_Renderer.Draw();
//Save the file out so we can see the result
m_pRenderTextures[RENDERTEXTURE_PARTICLESTAGE]->SaveToFile(L"data/particle.tga");
This is the code I use to render to texture
In the render to texture function, I do this
m_pDeviceContext->OMSetRenderTargets(1, &m_pRenderTargetView, _pDepthStencilView);
m_pRenderTargetView being independent to the m_pRenderTexture object, _pDepthStencilView being passed in from my main application.
I also clear the render target and clear the depth stencil beforehand, I just left the code out to keep the question bloating to minimum.
I'm sure this isn't just a problem saving out the texture - I tried to render the resource directly back into the application and got the same result.
I'm fairly sure it is because of my Depth Stencil Description, but I'm not sure exactly what could be wrong.
//Depth Stencil
D3D11_TEXTURE2D_DESC DepthStencilDescription;
{
DepthStencilDescription.Width = m_uiClientWidth;
DepthStencilDescription.Height = m_uiClientHeight;
DepthStencilDescription.MipLevels = 1;
DepthStencilDescription.ArraySize = 1;
DepthStencilDescription.Format = DXGI_FORMAT_D24_UNORM_S8_UINT;
DepthStencilDescription.SampleDesc.Count = 1;
DepthStencilDescription.SampleDesc.Quality = 0;
DepthStencilDescription.Usage = D3D11_USAGE_DEFAULT;
DepthStencilDescription.BindFlags = D3D11_BIND_DEPTH_STENCIL;
DepthStencilDescription.CPUAccessFlags = 0;
DepthStencilDescription.MiscFlags = 0;
}
Utility::Assert(m_pDevice->CreateTexture2D(&DepthStencilDescription, 0, &m_pDepthStencilBuffer));
Utility::Assert(m_pDevice->CreateDepthStencilView(m_pDepthStencilBuffer, 0, &m_pDepthStencilView));
As opposed to my Texture Description in my RenderTextureClass which is
TextureDescription.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
However trying to make them match each other threw an error.
Here is the PIX results of what is going on:
This is when I render to texture. It looks fine so far...
But I save the texture out and this is what it looks like
Rendering the texture back to the screen directly through the shader resource view... (Not a problem of the texture saving function)
The white colour is actually the BackBuffer's clear colour, the red colour is the RenderTexture's clear colour. So it has saved out the opposite of what I want.
I am expecting blue spheres on a white background
If anyone could point me in the right direction it would be great. Cheers :)
I have a texture and was curious as to what the texture sampler should be for sampling the sprite texture? I am using DirectX11, though if you know what it should be for DX9/10, I believe it is transferable.
I tried
AddressU = D3D11_TEXTURE_ADDRESS_WRAP
AddressV = D3D11_TEXTURE_ADDRESS_WRAP
AddressW = D3D11_TEXTURE_ADDRESS_WRAP
ComparisonFunc = D3D11_COMPARISON_NEVER
Filter = D3D11_FILTER_MIN_MAG_MIP_POINT
MaxAnisotropy = 1;
MaxLOD = D3D11_FLOAT32_MAX;
MinLOD = 0;
MipLODBias = 0;
Although when rendering, there appeared to be artifacts and it did not seem as clear as it should be.
This is an example of what the artifcats are. The top text with a light blue background you can see artifacts (for example, the A and C). The bottom text with the black background is the origin image.