Default

This is a Shadertoy example. Because of the way this docs are built, its housed in a minimal Indigo project for built purposes, but the shader code isn't run because it's incompatible with Indigo, so all you get is a black screen.

This example is the default shader you are given when you make a new shadertoy project.

The GLSL Output

This is the shadertoy compatible GLSL code that Ultraviolet manufactures:

void mainImage(out vec4 fragColor,in vec2 fragCoord){
  vec2 uv=fragCoord/iResolution.xy;
  vec3 col=0.5+(0.5*(cos((iTime+uv.xyx)+vec3(0.0,2.0,4.0))));
  fragColor=vec4(col,1.0);
}

Example Links

• View example code

• Live demo

Ultraviolet Shadertoy code

Reminder: The live demo will not work, below is the Shadertoy compatible code.

Note the custom ShaderToyEnv that is passed to the shader. This is a custom environment that contains read-only information like the running time, mouse position, resolution, which are supplied by shadertoy.

object ShaderToyExample:

  inline def image =
    Shader[ShaderToyEnv, Unit] { env =>
      def mainImage(fragColor: vec4, fragCoord: vec2): vec4 = {
        // Normalized pixel coordinates (from 0 to 1)
        val uv: vec2 = fragCoord / env.iResolution.xy

        // Time varying pixel color
        val col: vec3 = 0.5f + 0.5f * cos(env.iTime + uv.xyx + vec3(0.0f, 2.0f, 4.0f))

        // Output to screen
        vec4(col, 1.0f)
      }
    }

Then to get the code as a String so that we might print it or output it to a file or whatever, we can do the following:

object Output:

  val imageCode: String =
    ShaderToyExample.image.toGLSL[ShaderToy].toOutput.code