progs/glsl/CH11-bumpmap.vert

   1 //
   2 // Vertex shader for procedural bumps
   3 //
   4 // Authors: Randi Rost, John Kessenich
   5 //
   6 // Copyright (c) 2002-2006 3Dlabs Inc. Ltd.
   7 //
   8 // See 3Dlabs-License.txt for license information
   9 //
  10
  11 varying vec3 LightDir;
  12 varying vec3 EyeDir;
  13
  14 uniform vec3 LightPosition;
  15
  16 attribute vec3 Tangent;
  17
  18 void main()
  19 {
  20     EyeDir         = vec3(gl_ModelViewMatrix * gl_Vertex);
  21     gl_Position    = ftransform();
  22     gl_TexCoord[0] = gl_MultiTexCoord0;
  23
  24     vec3 n = normalize(gl_NormalMatrix * gl_Normal);
  25     vec3 t = normalize(gl_NormalMatrix * Tangent);
  26     vec3 b = cross(n, t);
  27
  28     vec3 v;
  29     v.x = dot(LightPosition, t);
  30     v.y = dot(LightPosition, b);
  31     v.z = dot(LightPosition, n);
  32     LightDir = normalize(v);
  33
  34     v.x = dot(EyeDir, t);
  35     v.y = dot(EyeDir, b);
  36     v.z = dot(EyeDir, n);
  37     EyeDir = normalize(v);
  38 }