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27 lines
861 B
GLSL
27 lines
861 B
GLSL
#version 120
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//
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// grid.frag
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// fragment shader
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//
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// Created by Andrzej Kapolka on 1/21/14.
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// Update by Ryan Huffman on 12/30/14.
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// Copyright 2013 High Fidelity, Inc.
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//
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// Distributed under the Apache License, Version 2.0.
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// See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
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//
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varying vec2 modelCoords;
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// Squared distance from center of 1x1 square to an edge along a single axis (0.5 * 0.5)
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const float SQUARED_DISTANCE_TO_EDGE = 0.25;
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void main(void) {
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// Squared distance from grid center - this assumes the grid lines are from
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// 0.0 ... 1.0 in model space.
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float sqDist = pow(modelCoords.x - 0.5, 2) + pow(modelCoords.y - 0.5, 2);
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float alpha = max(0, SQUARED_DISTANCE_TO_EDGE - sqDist) / SQUARED_DISTANCE_TO_EDGE;
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alpha *= gl_Color.a;
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gl_FragColor = vec4(gl_Color.rgb, alpha);
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}
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