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//
// Fragment shader for 3 dimensional polka dot shader.
//
// Author: Joshua Doss
//
// Copyright (C) 2002-2004 3Dlabs Inc. Ltd.
//
// See 3Dlabs-License.txt for license information
//
varying float LightIntensity;
varying vec3 MCPosition;
//Create uniform variables so dots can be spaced and scaled by user
//uniform vec3 Spacing;
//uniform float DotSize;
const vec3 Spacing = vec3 (0.314, 0.36, 0.261);
const float DotSize = 0.123;
//Create colors as uniform variables so they can be easily changed
//uniform vec3 ModelColor, PolkaDotColor;
const vec3 ModelColor = vec3 (0.75, 0.2, 0.1);
const vec3 PolkaDotColor = vec3 (1, 1, 1);
void main(void)
{
float insidesphere, sphereradius, scaledpointlength;
vec3 scaledpoint, finalcolor;
// Scale the coordinate system
// The following line of code is not yet implemented in current drivers:
// mcpos = mod(Spacing, MCposition);
// We will use a workaround found below for now
scaledpoint = MCPosition - (Spacing * floor(MCPosition/Spacing));
// Bring the scaledpoint vector into the center of the scaled coordinate system
scaledpoint = scaledpoint - Spacing/2.0;
// Find the length of the scaledpoint vector and compare it to the dotsize
scaledpointlength = length(scaledpoint);
insidesphere = step(scaledpointlength,DotSize);
// Determine final output color before lighting
finalcolor = vec3(mix(ModelColor, PolkaDotColor, insidesphere));
// Output final color and factor in lighting
gl_FragColor = clamp((vec4( finalcolor, 1.0 ) * LightIntensity), vec4(0.0), vec4(1.0));
}
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