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/*
* Copyright 2017 Google Inc. All Rights Reserved.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
precision highp float;
uniform sampler2D u_Texture;
uniform vec4 u_dotColor;
uniform vec4 u_lineColor;
uniform vec4 u_gridControl; // dotThreshold, lineThreshold, lineFadeShrink, occlusionShrink
varying vec3 v_TexCoordAlpha;
void main() {
vec4 control = texture2D(u_Texture, v_TexCoordAlpha.xy);
float dotScale = v_TexCoordAlpha.z;
float lineFade = max(0.0, u_gridControl.z * v_TexCoordAlpha.z - (u_gridControl.z - 1.0));
vec3 color = (control.r * dotScale > u_gridControl.x) ? u_dotColor.rgb
: (control.g > u_gridControl.y) ? u_lineColor.rgb * lineFade
: (u_lineColor.rgb * 0.25 * lineFade) ;
gl_FragColor = vec4(color, v_TexCoordAlpha.z * u_gridControl.w);
}
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