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//
// Fragment shader for procedural bumps
//
// Authors: Randi Rost, John Kessenich
//
// Copyright (c) 2002-2005 3Dlabs Inc. Ltd.
//
// See 3Dlabs-License.txt for license information
//
varying vec3 LightDir;
varying vec3 EyeDir;
uniform vec3 SurfaceColor; // = (0.7, 0.6, 0.18)
uniform float BumpDensity; // = 16.0
uniform float BumpSize; // = 0.15
uniform float SpecularFactor; // = 0.5
void main (void)
{
vec3 litColor;
vec2 c = BumpDensity * gl_TexCoord[0].st;
vec2 p = fract(c) - vec2(0.5);
float d, f;
d = p.x * p.x + p.y * p.y;
f = 1.0 / sqrt(d + 1.0);
if (d >= BumpSize)
{ p = vec2(0.0); f = 1.0; }
vec3 normDelta = vec3(p.x, p.y, 1.0) * f;
litColor = SurfaceColor * max(dot(normDelta, LightDir), 0.0);
vec3 reflectDir = reflect(LightDir, normDelta);
float spec = max(dot(EyeDir, reflectDir), 0.0);
spec *= SpecularFactor;
litColor = min(litColor + spec, vec3(1.0));
gl_FragColor = vec4(litColor, 1.0);
}
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