Questions tagged [compute-shader]
The compute-shader tag has no usage guidance.
61
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Gaps between terrain chunks generated with marching cubes
My generated terrain chunks have gaps between them:
I'm using Compute Shader and Simplex Noise from FastNoiseLite library to generate noise:
...
- 21
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0
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47
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How to connect terrain chunks smoothly? [duplicate]
I'm generating a 3D terrain chunk based on Simplex Noise and Marching Cubes algorithm to create mesh.
My chunks have global coordinates (x,y) e.g: (0, 1), (-1, 1)...
Noise is generated using Compute ...
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51
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Unity Compute Shader InterlockedMin Max not work on Android
I have a Compute Shader which uses InterlockedMin() and InterlockedMax().
The Compute Shader works very well on my PC (AMD ...
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18
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31
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Convolution matrix based minimum distance calculation
I want to detect the minimum distance to each game object within a convolution matrix in a compute shader.
I know the code is a bit to read, but the logic itself is not too complicated. I am trying to ...
- 31
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2
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40
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error X3671: loop termination conditions in varying flow control cannot depend on data read from a UAV
I have a problem with converting my pixel shader to compute shader.
The error is in this piece of code:
...
- 99
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43
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INSANE Slowdown when implementing MSAA
I am trying to implement MSAA in my very simple raytracer. However, when I do, my program gets and insane slowdown. I am working in Metal, and on the Metal HUD, I can see that my frametimes drop from ...
- 3
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1
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71
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Noise in compute shader related to threadsPerGroup
I have been working on a metaball compute shader for roughly 3 months now, and the only issue I have to resolve is noise in the output Dest[id.xy]. I also asked GPT 4 about the crux of the issue and ...
- 31
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222
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Flickering in mesh created procedurally using compute shaders and compute buffers
I'm attempting to create a mesh using compute buffers in Unity(2022.2.11). So far I've got the mesh rendering however parts of it periodically flicker frame to frame.
I'm assuming I've done something ...
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268
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Why does it take around 5 times longer to sample large RenderTextures vs. sampling large Texture3D/2Ds in a Compute Shader?
Firstly I am in Unity 2021.3.11f1 using DX12.
So the situation is the following. I have a large 3D RenderTexture, and I have a large 3D Texture3D with the same data, same format, same dimensions, same ...
- 11
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102
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Is it possible to draw billboards from point data held in a compute buffer?
I'm currently trying to show a galaxy and have developed a compute shader that places/moves "stars".
Another vertex/fragment shader reads the buffer and currently places a point at each ...
- 1,065
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85
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Looking for an advice on how to possibly boost my compute shader
I have 4 rendertargets R10G10B10A2 each being used to store color and normal in a compact double RGB 555 bits format. When I'm doing the lighting pass I'm obliged to have extra rendertargets because ...
- 99
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136
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Reliably addressing compute buffer when using large numbers of threads
I'm trying to move a 262,144 [2^18] points (stars) in a compute shader and am struggling to reliably address the data in a buffer.
I understand that there's a 3-dimensional array ...
- 1,065
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2
answers
387
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Compute Shader generating data for use on CPU
I'm trying to create a compute shader that will generate and manage the movement of a point cloud.
The shader needs several thousand points to work on and I want to pull back the first dozen or so.
...
- 1,065
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2k
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Send an array of struct to compute shader
I am using Unity to send two types of data to the Compute Shader:
A struct:
struct Flock
{
public Vector3 position;
public Vector3 velocity;
}
And an ...
- 33
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108
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d3d11 compute shader compile failed
I want to comiple a compute shader from text, but it failed with 0x8e16d728 error.
...
- 15
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1
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205
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Why can't I use the "degrees" character in HLSL comments?
I was in the process of creating a function in my compute shader that converts a 180° angle to a 360° CCW angle like this:
...
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101
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ComputeBuffer Values messed up when calling the dispatch many times in a row
I'm having a RWStructuredBuffer called AffectedVertices give me random data instead of 1 simple value to resultAffectedVertices, ...
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258
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Generating Shader Includes via script at compile time
I'm experimenting with compute shaders in Unity. A pretty typical thing you wanna do is marshal a buffer of structs back and fourth between C# and HLSL land. Ordinarily you'd have to manually define ...
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324
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Marching cube terrain generated by compute shader gives strange error
I'm creating my own terrain terrain system for Unity using marching cubes but I've run into a problem I'm stumped on. First I'll explain how it works:
A compute shader creates an array of points ...
- 1
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123
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Unity, connecting unlit shader output to compute shader?
I'm hoping to learn what my options are for sharing the outputs of simple unlit shaders with compute shaders that will operate on the data.
Is my only course of action to use a render texture with the ...
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2k
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Difference between ComputeBuffer and GraphicsBuffer in Unity?
At first I thought that ComputeBuffer's could only be used in compute shaders and that GraphicsBuffer's could only be used in ...
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2
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765
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How to evaluate a binary expression tree in HLSL without recursion or a stack?
I'm currently working on a dual contouring implementation for which I want to create procedural terrain based on layers of noise. Both, the terrain generation and the mesh creation via dual contouring ...
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197
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How to synchronize reads and writes to a StructuredBuffer across warps in HLSL?
I'm currently trying to implement smooth voxel terrain (using dual contouring) with mesh generation happening on the GPU and I'm struggeling with chunked level of detail creation. My approach is as ...
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918
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OpenGL Compute Shader vs Fragment Shader device support
I have a game with massively parallelizable logic, which I intend to write calculate on the GPU (Java/LibGDX).
I am planning to implement a logic for it through a fragment shader, instead of a compute ...
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3
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430
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Voxel raycasting algorithm not working correctly
I am using Unity with a compute shader to render to a texture. So far I have been checking points along the rays in units of 1 just for testing, so I know it works. Now I am simply trying to write a ...
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217
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ID3D11DeviceContext:::CopyResource is bottleneck in my particle system
I have a snow particle system and I use simplex noise for creating turbulence effect.
At first, I made calculations on the CPU, and the simplex noise calls obviously were the bottleneck.
The ...
2
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1
answer
410
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Splitting up HLSL code into separate functions causes the number of needed temporary registers to increase
EDIT
Per request I've provided a simple compute shader that reproduces the problem. The compute shader below is kind of a contrived example meant to compute the rolling average over an input ...
- 53
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419
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Creating the Vertices and Triangle Indices for Voxel Generated Mesh
I am running into a problem with a compute shader I am writing to generate the vertices and triangle indices for a voxel generated mesh.
Currently, I am creating an ...
- 121
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328
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Floodfilling a texture in HLSL Compute shader
I have a very large texture which I want to fill with values representing "distance in units from a river tile".
The texture is already seeded with these origin river points (meaning ...
- 1,456
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87
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GLSL link fails with C9999 (too many buffer declarations?)
I'm receiving a C9999 (*** exception during compilation ***) linker error for an OpenGl 4.6 compute shader. It seems to be related to the number of SSBOs I have declared (14 separate declarations), ...
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987
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Problem unrolling loop in compute shader
I'm pretty new to compute shaders and shader writing in general. I'm trying to write a compute shader for a procedural generation project I'm working on, it's purpose is to blend biomes together. The ...
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42
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How to generate a star onto a render texture with spherical warping
How would one proceduraly generate a star in a compute shader that looks like one of thes two at any size needed. Also any way transfer this into a spherical map, would be appreciated.
Goal is to ...
- 21
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240
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Passing touch position to compute shader
I am working on a game where I have to mix colored liquids as shown here. I am working with a plugin (StableFluids) to get this effect: Effect
Problem:
The shaders used in the plugin are able to ...
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3k
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Unity3D URP - How do I approach creating Fog of War for 3D top-down stealth game?
What I try to achieve is a fog of war system for 3d top-down stealth game. I have searched the Internet and it seems that behavior I want to achieve can be done by using secondary camera that is ...
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7k
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Compute shader: Property at kernel index is not set
I am trying to follow this excellent Coding Adventure: https://www.youtube.com/watch?v=lctXaT9pxA0 in order to get a very simple mesh deformation on a mesh using a compute shader.
I'm getting an error ...
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440
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Vulkan imageLoad data of r32f format in compute shader
I am doing add with a compute shader. All input-output data are stored in VkImage, the format is VK_FORMAT_R32_SFLOAT. In the shader, the corresponding layout is r32f.
I have two questions about this:
...
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844
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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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523
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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 ...
- 196
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116
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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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192
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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 <...
- 101
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53
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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:
...
0
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0
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389
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-...
- 2,856
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637
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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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1k
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How to write a PBR Unlit Shader in Unity? [closed]
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 ...
- 71
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83
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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 ...
- 251
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598
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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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1k
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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 ...
- 1,460
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1
answer
874
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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 "...
- 241
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4k
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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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