directcompute | 易学教程

Do DirectX Compute Shaders support 2D arrays in shared memory?

阅读更多关于 Do DirectX Compute Shaders support 2D arrays in shared memory?

问题 I want to use groupshared memory in a DirectX Compute Shader to reduce global memory bandwidth and hopefully improve performance. My input data is a Texture2D and I can access it using 2D indexing like so: Input[threadID.xy] I would like to have a 2D array of shared memory for caching portions of the input data, so I tried the obvious: groupshared float SharedInput[32, 32]; It won't compile. The error message says syntax error: unexpected token ',' . Is there any way to have a 2D array of

DirectX 11 - Compute shader: Writing to an output resource

阅读更多关于 DirectX 11 - Compute shader: Writing to an output resource

问题 I've just started using the Compute shader stage in DirectX 11 and encountered some unwanted behaviour when writing to an output resource in the Compute shader. I seem to get only zeroes as output which, to my understanding, means that out-of-bound reads has been performed in the Compute shader. (Out-of-bound writes results in no-ops) Creating the Compute shader components Input resources First I create an ID3D11Buffer* for input data. This is passed as a resource when creating the SRV used

D3D12 Use backbuffer surface as unordered access view (UAV)

阅读更多关于 D3D12 Use backbuffer surface as unordered access view (UAV)

问题 Im making a simple raytracer for a schoolproject were a compute shader is supposed to be used to shade a triangle or some other primitive. For this I'd like to write to a backbuffer-surface directly in the compute shader, to then present the results imideatly. I know for certain that this is possible in DX11 though i can't seem to get it to work in DX12. I couldn't gather that much information about this, but i found this gamedev thread discussing the exact same problem I try to figure out

DirectX compute shader: how to write a function with variable array size argument?

阅读更多关于 DirectX compute shader: how to write a function with variable array size argument?

问题 I'm trying to write a function within a compute shader (HLSL) that accept an argument being an array on different size. The compiler always reject it. Example (not working!): void TestFunc(in uint SA[]) { int K; for (K = 0; SA[K] != 0; K++) { // Some code using SA array } } [numthreads(1, 1, 1)] void CSMain( uint S1[] = {1, 2, 3, 4 }; // Compiler happy and discover the array size uint S2[] = {10, 20}; // Compiler happy and discover the array size TestFunc(S1); TestFunc(S2); } If I give an

DirectCompute CreateBuffer fails with error 0x80070057 (E_INVALIDARG)

阅读更多关于 DirectCompute CreateBuffer fails with error 0x80070057 (E_INVALIDARG)

问题 I'm trying to create a buffer in GPU memory to upload data from CPU. GPU access will be readonly. Data will be used as an input buffer for a compute shader. CreateBuffer() fails with error 0x80070057 (E_INVALIDARG). I read the docs and read it again without discovering which argument cause the failure. Here is an extract from my code where I marked the failure: HRESULT hr = S_OK; RECT rc; GetClientRect( g_hWnd, &rc ); UINT width = rc.right - rc.left; UINT height = rc.bottom - rc.top; UINT

Convert SlimDX.Direct3D11 Texture2D to .Net Bitmap

阅读更多关于 Convert SlimDX.Direct3D11 Texture2D to .Net Bitmap

问题 Converting an .Net Bitmap to a SlimDx Texture2D works very fast like this: http://www.rolandk.de/index.php?option=com_content&view=article&id=65:bitmap-from-texture-d3d11&catid=16:blog&Itemid=10 private Texture2D TextureFromBitmap(FastBitmapSingle fastBitmap) { Texture2D result = null; DataStream dataStream = new DataStream(fastBitmap.BitmapData.Scan0, fastBitmap.BitmapData.Stride * fastBitmap.BitmapData.Height, true, false); DataRectangle dataRectangle = new DataRectangle(fastBitmap

reading GPU resource data by CPU

阅读更多关于 reading GPU resource data by CPU

问题 i am learning directx11 these days. and i have been stuck in compute shader section. so i made four resource and three corresponding view. immutable input buffer = {1,1,1,1,1} / SRV immutable input buffer = {2,2,2,2,2} / SRV output buffer / UAV staging buffer for reading / No View and i succeeded to create all things, and dispatch cs function, and copy data from output buffer to staging buffer, and i read/check data. // INPUT BUFFER1-------------------------------------------------- const int

DirectCompute versus OpenCL for GPU programming?

阅读更多关于 DirectCompute versus OpenCL for GPU programming?

问题 I have some (financial) tasks which should map well to GPU computing, but I'm not really sure if I should go with OpenCL or DirectCompute. I did some GPU computing, but it was a long time ago (3 years). I did it through OpenGL since there was not really any alternative back then. I've seen some OpenCL presentations and it looks really nice. I haven't seen anything about DirectCompute yet, but I expect it to also be good. I'm not interested at the moment in cross-platform compatibility, and

DirectCompute versus OpenCL for GPU programming?

阅读更多关于 DirectCompute versus OpenCL for GPU programming?

I have some (financial) tasks which should map well to GPU computing, but I'm not really sure if I should go with OpenCL or DirectCompute. I did some GPU computing, but it was a long time ago (3 years). I did it through OpenGL since there was not really any alternative back then. I've seen some OpenCL presentations and it looks really nice. I haven't seen anything about DirectCompute yet, but I expect it to also be good. I'm not interested at the moment in cross-platform compatibility, and besides, I expect the two models to be similar enough to not cause a big headache when trying to go from

How can I feed compute shader results into vertex shader w/o using a vertex buffer?

阅读更多关于 How can I feed compute shader results into vertex shader w/o using a vertex buffer?

问题 Before I go into details I want outline the problem: I use RWStructuredBuffers to store the output of my compute shaders (CS). Since vertex and pixel shaders can’t read from RWStructuredBuffers, I map a StructuredBuffer onto the same slot (u0/t0) and (u4/t4): cbuffer cbWorld : register (b1) { float4x4 worldViewProj; int dummy; } struct VS_IN { float4 pos : POSITION; float4 col : COLOR; }; struct PS_IN { float4 pos : SV_POSITION; float4 col : COLOR; }; RWStructuredBuffer<float4>