dash.yaml

styles:
    lines-dash:
        doc:
            author: 
                name: Patricio Gonzalez Vivo
                twitter: patriciogv
            version: 0.0.1
            tangram-version: 0.0.7
            licence: MIT
            description: |
                Apply a stripe pattern to a line
            examples:
                sandbox:
                    url: https://tangrams.github.io/tangram-sandbox/styles/elevation.yaml
                    img: https://tangrams.github.io/tangram-sandbox/styles/elevation.png
                    lines: 59-63
        ui:
            shaders:
                defines:
                    DASH_SCALE:
                        type: number
                        label: Scale
                        range: 
                            min: 1.
                            max: 1000.
                            step: 1.
                    DASH_SIZE:
                        type: number
                        label: Size
                        range: 
                            min: 0.
                            max: 1.
                            step: 0.01
        base: lines
        texcoords: true
        shaders:
            defines:
                DASH_SCALE: .1
                DASH_SIZE: .5
            blocks:
                filter: |
                    if ( step(DASH_SIZE,fract(v_texcoord.y*DASH_SCALE)) == 0.){
                        discard;
                    }