blob: b5dabb4c8a8a58a1313a7b98d632b2cec9a6dfb4 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
|
//
// Fragment shader for procedural bumps
//
// Authors: John Kessenich, Randi Rost
//
// Copyright (c) 2002-2006 3Dlabs Inc. Ltd.
//
// See 3Dlabs-License.txt for license information
//
// Texture mapping/modulation added by Brian Paul
//
varying vec3 LightDir;
varying vec3 EyeDir;
uniform float BumpDensity; // = 16.0
uniform float BumpSize; // = 0.15
uniform float SpecularFactor; // = 0.5
uniform sampler2D Tex;
void main()
{
vec3 ambient = vec3(0.25);
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 = inversesqrt(d + 1.0);
if (d >= BumpSize)
{ p = vec2(0.0); f = 1.0; }
vec3 SurfaceColor = texture2D(Tex, gl_TexCoord[0].st).xyz;
vec3 normDelta = vec3(p.x, p.y, 1.0) * f;
litColor = SurfaceColor * (ambient + 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);
}
|
