Shadertoy2GM

This javascript webapp converts GLSL code from shadertoy.com to Gamemaker GLSL ES as well as output other necessary code to run.

What does it do?

• Adds varying vec2 fragCoord;
• Replaces void MainImage() with void main(void).
• Replaces fragColor with gl_FragColor.
• Replaces all instances of texture to texture2D.
• Replaces all instances of iChannel0 to gm_BaseTexture.
• Replaces all instances of iTime to iGlobalTime.
• Adds uniform vec3 iResolution; if iResolution.xy is found, else...
• ...Adds uniform float iResolution; if iResolution is found
• Adds uniform float iGlobalTime;.
• Edits the pow(x, y) function to pow(abs(x), y)
• Outputs vertex, fragment, create event, and draw event.
• Warns of incompatible commands.

This works for simple shaders. More complex shaders require more manual work on your part.

Shader Inputs	Supported
iResolution	✔
iTime	✔
iTimeDelta	❌
iFrame	❌
iChannelTime	❌
iChannelResolution	❌
iMouse	❌
iChannel0	✔
iDate	❌
iSampleRate	❌

What did I learn?

✔️JavaScript text processing.

Any feedback is welcome! :)