overte-HifiExperiments/libraries/render-utils/src/grid.slf

<@include gpu/Config.slh@>
<$VERSION_HEADER$>
//  Generated on <$_SCRIBE_DATE$>
//  grid.frag
//  fragment shader
//
//  Created by Zach Pomerantz on 2/16/2016.
//  Copyright 2016 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; 
};

Grid getGrid() { return grid; }

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

layout(location=0) out vec4 outFragColor;

void main(void) {
    Grid grid = getGrid();

    float alpha;
    if (grid.edge.z == 0.0) {
        alpha = paintGrid(varTexCoord0, grid.offset.xy, grid.period.xy, grid.edge.xy);
    } else {
        alpha = paintGridMajorMinor(varTexCoord0, grid.offset, grid.period, grid.edge);
    }
    if (alpha == 0.0) {
        discard;
    }

    outFragColor = vec4(varColor.xyz, varColor.w * alpha);
}