40 lines
1.2 KiB
GLSL
40 lines
1.2 KiB
GLSL
// pathfinder/shaders/gles2/demo-3d-monument.fs.glsl
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//
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// Copyright (c) 2017 The Pathfinder Project Developers.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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precision mediump float;
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uniform vec3 uLightPosition;
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uniform vec3 uAmbientColor;
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uniform vec3 uDiffuseColor;
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uniform vec3 uSpecularColor;
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uniform float uShininess;
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uniform vec3 uNormal;
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varying vec3 vPosition;
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void main() {
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vec3 normal = normalize(uNormal);
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vec3 lightDirection = normalize(uLightPosition - vPosition);
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float lambertian = max(dot(lightDirection, normal), 0.0);
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float specular = 0.0;
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if (lambertian > 0.0) {
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vec3 viewDirection = normalize(-vPosition);
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vec3 halfDirection = normalize(lightDirection + viewDirection);
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float specularAngle = max(dot(halfDirection, normal), 0.0);
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specular = pow(specularAngle, uShininess);
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}
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vec3 color = uAmbientColor + lambertian * uDiffuseColor + specular * uSpecularColor;
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gl_FragColor = vec4(color, 1.0);
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}
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