Minimal Compute Shader Examples

Minimal test scenes contains compute shaders, compute buffers etc
Playing with the transport between CPU <-> GPU

Unity version : 6000.3 (Unity 6.3), contains both BuiltinRP and Universal Render Pipeline (URP) scenes
See branches for older Unity versions
Tested with : Win DX11

Scene	Image	Description
🔷 01_Compute_Texture 🔷
`01_1_Basic`	<img src="READMEimages/01_1_Basic.gif" width="250" />	The most basic one, edit texture with compute shader, shader takes the texture for rendering
`01_2_FallingSand`	<img src="READMEimages/01_2_FallingSand.gif" width="250" />	Example of using compute to animate texture pixels
`01_3_Fluid_2D`	<img src="READMEimages/01_3_Fluid_2D.gif" width="250" />	GPU Fluid. Ref to Scrawk/GPU-GEMS-2D-Fluid-Simulation
`01_4_Fluid_3D`	<img src="READMEimages/01_4_Fluid_3D.gif" width="250" />	A 3D version based on above GPU Fluid
🔷 02_StructuredBuffer 🔷
`02_1_StructuredBufferNoCompute`	<img src="READMEimages/02_1_StructuredBufferNoCompute.gif" width="250" />	ComputeBuffer can also be used in Shader, not just ComputeShader. The folder contains implementation of unlit vert-frag, surface shader and unlit URP shader
`02_2_ComputePaintTexture`	<img src="READMEimages/02_2_ComputePaintTexture.gif" width="250" />	Paint the texture by sending object positions to compute shader with StructuredBuffer
`02_3_RotatingCircles`	<img src="READMEimages/02_3_RotatingCircles.gif" width="250" />	Similar to above, just another playground scene
`02_4_ComputePaintTexture_DFT`	<img src="READMEimages/02_4_ComputePaintTexture_DFT.gif" width="250" />	Similar to above but drawing with Epicycles using Discrete Fourier Transform. Ref to The Coding Train's youtube video
`02_5_ComputeParticlesDirect`	<img src="READMEimages/02_5_ComputeParticlesDirect.gif" width="250" />	GPU Particle, drawing fixed no. of particles
`02_6_ComputeSketch`	<img src="READMEimages/02_6_ComputeSketch.gif" width="250" />	Draw quads on the screen with color filled by compute shader
`02_7_ShimmerSphere`	<img src="READMEimages/02_7_ShimmerSphere.gif" width="250" />	Pass spheres position and radius to quad material for a fake shimmer effect
🔷 03_GPU_to_CPU 🔷
`03_1_StructuredBufferWithCompute`	<img src="READMEimages/03_1_StructuredBufferWithCompute.gif" width="250" />	Another basic one, use compute to calculate some data and send back to CPU
`03_2_AsyncGPUReadback`	<img src="READMEimages/03_2_AsyncGPUReadback.gif" width="250" />	Similar to `StructuredBufferWithCompute`, but use AsyncGPUReadback to get array data back to CPU
`03_3_AsyncGPUReadbackTex`	<img src="READMEimages/03_3_AsyncGPUReadbackTex.gif" width="250" />	Result is same as `ComputeUAVTexture`, but this scene uses AsyncGPUReadback to get texture data back to CPU, and CPU send the texture data to Shader for rendering
`03_4_AsyncGPUReadbackMesh`	<img src="READMEimages/03_4_AsyncGPUReadbackMesh.gif" width="250" />	Update mesh vertices with compute + AsyncGPUReadback to get the vertex data back to CPU for physics
`03_5_AsyncGPUReadbackMesh_NewMeshAPI`	<img src="READMEimages/03_4_AsyncGPUReadbackMesh.gif" width="250" />	Same as above but using the new Mesh API
`03_6_PixelPercentage`	<img src="READMEimages/03_6_PixelPercentage.gif" width="250" />	Count the filled pixel percentage
`03_7_ColorPalette`	<img src="READMEimages/03_7_ColorPalette.JPG" width="250" />	Find the top colors and replace them
🔷 04_Indirect 🔷
`04_1_IndirectCompute`	<img src="READMEimages/04_1_IndirectCompute.gif" width="250" />	Simple indirect compute (indirect dispatch) and CopyCount
`04_2_ComputeParticlesIndirect`	<img src="READMEimages/04_2_ComputeParticlesIndirect.gif" width="250" />	GPU Particle, drawing dynamic no. of particles, no need to read back to CPU!
`04_3_ComputeParticlesIndirect_VFX`	<img src="READMEimages/04_3_ComputeParticlesIndirect_VFX.gif" width="250" />	Implementation of above scene with VFX graph
`04_4_IndirectReflectedStar`	<img src="READMEimages/04_4_IndirectReflectedStar.gif" width="250" />	Draw stars on the screen only if the pixels are bright enough
🔷 05_Shader_to_CPU 🔷
`05_1_UAVInShader`	<img src="READMEimages/05_1_UAVInShader.gif" width="250" />	Read some data back to CPU from fragment shader
`05_2_ShaderBakeToTexture`	<img src="READMEimages/05_2_ShaderBakeToTexture.gif" width="250" />	Bake shader pixel result to texture
🔷 06_Compute_Mesh 🔷
`06_1_ComputeVertex`	<img src="READMEimages/06_1_ComputeVertex.gif" width="250" />	Replace vertex buffer with StructuredBuffer and drive vertex displacement by compute
`06_2_ComputeVertexLit`	<img src="READMEimages/06_2_ComputeVertexLit.gif" width="250" />	A usecase of above, with different shader passes share the same vertex data
`06_3_SkinnedMeshBuffer_SameMesh`	<img src="READMEimages/06_3_SkinnedMeshBuffer_SameMesh.gif" width="250" />	Blend the vertex data from 2 SkinnedMeshRenderer vertex buffer and render it with MeshRenderer
`06_4_SkinnedMeshBuffer_DiffMesh`	<img src="READMEimages/06_4_SkinnedMeshBuffer_DiffMesh.gif" width="250" />	Similar to above but blending 2 different SkinnedMeshes. The blended triangles are drawn with DrawMeshInstancedIndirect()
`06_5_VFXGraphMeshDeform`	<img src="READMEimages/06_5_VFXGraphMeshDeform.gif" width="250" />	Using VFX Graph to deforming mesh (particle as vertex)

Disclaimer: The stuff here might not be the best practice / optimized :'(. But at least they works. Play them for fun.

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Minimal Compute Shader Examples

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Minimal Compute Shader Examples

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