diagonal-grid.yaml

import:
    - ../space/tile.yaml
    - ../patterns/grid.yaml

styles:
    polygons-diagonal-grid:
        doc:
            author: 
                name: Patricio Gonzalez Vivo
                twitter: patriciogv
            version: 0.0.1
            tangram-version: 0.0.7
            licence: MIT
            description: |  
                Apply a diagonal grid pattern to the polygon style. To learn more about patterns check [this chapter from the Book of Shaders](https://thebookofshaders.com/09/)
        ui:
            shaders:
                defines:
                    GRID_SCALE:
                        type: number
                        label: Scale
                        range: 
                            min: 1.
                            max: 1000.
                            step: 1.
                    GRID_WIDTH:
                        type: number
                        label: Width
                        range: 
                            min: 0.
                            max: 1.
                            step: 0.01
                    GRID_COLOR: 
                        type: color
                        label: Color
                    GRID_BACKGROUND_COLOR: 
                        type: color
                        label: 'Background color'

        base: polygons
        mix: [space-tile, patterns-grid]
        shaders:
            defines:
                GRID_SCALE: 20.
                GRID_WIDTH: .05
                GRID_COLOR: color.rgb
                GRID_BACKGROUND_COLOR: color.rgb*.5
            blocks:
                color: |
                    color.rgb = mix(GRID_COLOR, 
                                    GRID_BACKGROUND_COLOR, 
                                    diagonalGrid(   fract(getTileCoords()*GRID_SCALE),
                                                    GRID_WIDTH));