https://github.com/TheNuSan/BonzomaticToShadertoy

Script to convert bonzomatic glsl fragment shaders to shadertoy
https://github.com/TheNuSan/BonzomaticToShadertoy

Last synced: 28 days ago
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Script to convert bonzomatic glsl fragment shaders to shadertoy

• Host: GitHub
• URL: https://github.com/TheNuSan/BonzomaticToShadertoy
• Owner: TheNuSan
• Created: 2022-11-29T10:02:34.000Z (about 2 years ago)
• Default Branch: main
• Last Pushed: 2022-11-29T10:47:35.000Z (about 2 years ago)
• Last Synced: 2024-08-04T02:07:47.293Z (4 months ago)
• Language: Python
• Size: 2.19 MB
• Stars: 13
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

Awesome Lists containing this project

• awesome-demoscene - Bonzomatic To Shadertoy - Python script to convert bonzomatic glsl fragment shaders to use them on shadertoy.com (Demomaking / Tools)

README

        
# Bonzomatic To Shadertoy

Python script to convert bonzomatic glsl fragment shaders to use them on shadertoy.com

## Usage

- Place your shader.glsl file in the folder

- Execute BonzomaticToShadertoy.bat

- In a command line, you can also specify the name of the shader file: "BonzomaticToShadertoy.bat filename.glsl"

- Open the shader.webgl file that has been created in a text editor

- Copy-paste the code into a new shader on shadertoy.com

## Limitations

- As Bonzomatic textures are not present in Shadertoy, the tool just give each a different channels and you have to assign textures in shadertoy yourself

- FFT textures are currently assigned to a different channel each

- Using previous frame texture will just be assigned to a texture channel, in Shadertoy you need to put your shader in "Buffer A" instead of Image so you can sample the previous frame

- float numbers are rounded to 4 digits, because otherwise the tool would output weird numbers like 0.199999998

- intermediary variables are often inserted before function calls

- if you use "half" as a variable name, it will cause issues

## Todo

- Better FFT handling

- Option to generate a json for importing with "Shadertoy unofficial plugin"

- replace texNoise with a call to a perlin noise function

- maybe replacing python by an exe tool so it can be autonomous

- fixing weird float numbers inside glslangValidator/spirv-cross source code instead of afterward

- fixing intermediary variables inserted before function calls

## How it works

- Use glslangValidator (github.com/KhronosGroup/glslang) to convert glsl to a spirv shader

- Use spriv-cross (github.com/KhronosGroup/SPIRV-Cross) to convert the spirv shader back to webgl-ready code

- Use python to replace part of the code to adapt the Bonzomatic shader to Shadertoy

    - replace input variables (pixel coordinates, resolution, time, main function name)

    - remove useless lines (texture definitions, version, highp)

    - round floats to 4 digits (glslangValidator/spirv-cross generate weird numbers)

    - assign textures to shadertoy channels