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//
// Fragment shader for adaptively antialiasing a procedural stripe pattern
//
// Author: Randi Rost
// based on a shader by Bert Freudenberg
//
// Copyright (c) 2002-2004 3Dlabs Inc. Ltd.
//
// See 3Dlabs-License.txt for license information
//
varying float V; // generic varying
varying float LightIntensity;
uniform float Frequency; // Stripe frequency = 16
void main (void)
{
float sawtooth = fract(V * Frequency);
float triangle = abs(2.0 * sawtooth - 1.0);
float dp = length(vec2 (dFdx(V), dFdy(V)));
float edge = dp * Frequency * 2.0;
float square = smoothstep(0.5 - edge, 0.5 + edge, triangle);
gl_FragColor = vec4 (vec3 (square), 1.0) * LightIntensity;
}
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