Questions tagged [compute-shader]
The compute-shader tag has no usage guidance.
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Unity Direct Compute: Setting a struct of arrays
The NVIDIA Direct Compute programming guide lists some best practices for memory management on the GPU. One tip they give on page 8 ("Structured Buffers") is to use a 'structure of arrays' (SOA) ...
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How can I 'pass' multiple render targets to an Unreal compute shader?
I need to access three things from a compute shader: the current textures being drawn to two render targets, as well as the previous output of the same compute shader. Essentially, I am trying to ...
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What is the right way to access raw data from an Unreal material's output?
I am using an Unreal material not so much as a material but essentially as a compute shader for performance reasons (using the Custom nodes in a material blueprint), where I perform a bunch of per-...
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34 views
Unity: running GPU intensive operations in editor mode
I have written an erosion simulator that I want to execute from the editor (for generating terrain and such outside of play mode). Unfortunately, when I crank the parameters on my simulation, unity ...
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3D terrain editor brush using compute shader
i am working on 3D terrain editor, and i have simple brush for adding or subtracting height. Right now I am calculating new Heights on CPU dependent on brush radius.
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1answer
45 views
OpenGL approach to depth-testing-like combination of a large buffer of fragments
I have a depth buffer and color buffer created by another effect. The buffer is more than double my screen size. It is not rendered from geometry, but as a whole it resembles a rendered scene with an ...
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44 views
How Lots of ComputeBuffers at Once Affect Performance Unity
How will lots ComputeBuffer instances affect performance? And why?
I know that I should call ComputeBuffer.Release() on every <...
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33 views
issue with Compute Shader macbeth chart
I'm trying to generate a macbeth chart using the compute shader, but there seems to be an issue with the output image.
here is the glsl code:
...
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58 views
GLSL Atomics With Floats
I am implementing SDSM and in a GLSL compute shader I need to min/max vec3 values to compute the shadow map bounds. The sample implementation (in HLSL) uses vectors in "light space" that spans from 0-...
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209 views
Generating Mesh using Compute Shaders
I am working on a game project in unity which has a procedurally generated terrain made up of 16*128*16 chunks of blocks. The map size is going to be finite (Possibly up to ~100*100 chunks). Currently ...
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1answer
495 views
How to write a PBR Unlit Shader in Unity?
I have a REALLY specific case here:
I have an Texture (a webcam), that is used by a shader to pickup a few x,y colors at the cordinates, and renders to a ...
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1answer
54 views
Steering constantly turning in circles
I've been working on a fish system in a compute shader but bugs have been drowning me. The latest bug had me strip almost all the functionality to track down:
Fish keep turning in circles. It starts ...
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1answer
254 views
DirectX 11 Compute Shader error DXGI_ERROR_DEVICE_HUNG
I am trying to use a compute shader for ray picking technology. My shader accepts:
vertex buffer of all models
index buffer of all models
a buffer of transformation matrices of all models
Offset ...
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340 views
How to get Pixel Coordinates of certain colors in a Texture?
I have a relatively big Texture, and I try to find a certain color pixels pattern:
eg. White, Black, White, Green .
They are lying next to each other,
If I use Texture2d.Getpixels() on every pixel ...
2
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1answer
224 views
Solving a recursive problem in the geometry (or any other) shader
I would like to calculate an effect of an external force on a binary tree (wind on a tree).
It's a recursive function - take a (parent) node and calculate the angle to rotate all of the nodes "...
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1answer
2k views
Using a Compute Shader in Unity to convert a texture to a float array
I have a fairly simple requirement for a compute shader (DirectCompute through Unity). I have a 128x128 texture and I'd like to turn the red channel of that texture into a 1d array of floats. I need ...
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1answer
630 views
Vulkan Storage Buffers, loss of data
I have been passing glm::vec3's in an array to a storage buffer to be processed by a compute shader, but once it has been modified I am getting some malformed data back.
Shader
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2answers
1k views
Pseudo random number generation in compute shader
Using a C# script in Unity3D to control a HLSL compute shader, I'm trying to generate pseudo random numbers on the gpu. Following along with
GPU Gems 3 Hybrid Tausworthe method
and another thread ...
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1answer
69 views
Get VertexSize of Instance in VertexShader
I'm using Unitys DrawProceduralIndirect function to directly render the content of a ComputeShader.
I setup the argumentBuffer for this function as follows:
<...
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536 views
Passing an UAV to a Pixel Shader in DirectX11
I have a compute shader which task is to take an input image and then blur it using a Gaussian filter approach. The input and output for the compute shader looks like this:
...
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1answer
143 views
Why does my triangle ray intersection test always return -1.0f?
I'm trying to get the mouse click position on a terrain geometry, but multiple times in each frame; doing it on the CPU was way too slow, so I'm trying to do it with a compute shader. I can't seem to ...
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1answer
471 views
Batch/Combine multiple Graphics.DrawProcedural-Calls in Unity
I have multiple calls to Graphics.DrawProcedural in my Unity-project.
E.g. I'm drawing 1000 procedural geometries that share the same material and get their ...
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1answer
153 views
In theory, would an erosion algorithm compute faster on a GPU than CPU?
I'm planning to port an erosion algorithm from CPU to GPU, in theory, will it be faster or would it be better to multi-thread it on the CPU? The algorithm has quite a lot of if statements and loops ...
2
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1answer
273 views
How to sort tiled decal list?
I have a tiled forward render pipeline (also called forward+). It assigns a list of lights for every 16*16 block of pixels (tiles) on the screen. Lights are accumulated additively so their order doesn'...
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1answer
243 views
DirectX shader - how to spread raytracer computation over multiple frames?
I'm playing around making a shadertoy style SDF raytracer in HLSL and to make it run faster on high resolutions (1080p and up) I'd like to spread the computation over multiple frames.
Right now I ...
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0answers
333 views
RWTexture3D in Compute Shader on Intel HD 4000
I'm having some weird issues running a Compute Shader with DirectX 11 on an Intel HD 4000 GPU.
The goal is to write different shapes into a DXGI_FORMAT_R32_FLOAT 3D Texture with a size of ...
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1answer
320 views
Flowing GPU compute water
I have a civil engineering background and perform hydraulic and hydrologic analysis' regularly. They sell degrees for that sort of thing, but it's really not rocket science. I recently got it in my ...
