<@include gpu/Config.slh@>
<$VERSION_HEADER$>
//  Generated on <$_SCRIBE_DATE$>
//
//  Created by Sam Gondelman on 5/9/19
//  Copyright 2019 High Fidelity, Inc.
//
//  Distributed under the Apache License, Version 2.0.
//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
//

<@include gpu/ShaderConstants.h@>
<@include gpu/Paint.slh@>

struct Grid {
    vec4 period;
    vec4 offset;
    vec4 edge;
};

LAYOUT(binding=0) uniform gridBuffer {
  Grid grid;
};

layout(location=GPU_ATTR_TEXCOORD0) in vec2 varTexCoord0;
layout(location=GPU_ATTR_COLOR) in vec4 varColor;

layout(location=0) out vec4 _fragColor0;

void main(void) {
    float alpha = mix(paintGridMajorMinor(varTexCoord0, grid.offset, grid.period, grid.edge),
                      paintGrid(varTexCoord0, grid.offset.xy, grid.period.xy, grid.edge.xy),
                      float(grid.edge.z == 0.0));
    alpha *= varColor.w;

    if (alpha < 0.0001) {
        discard;
    }

    _fragColor0 = vec4(varColor.xyz, alpha);
}