Examples/CSM/Shader/BumpMap/bump.fp

   1
   2 uniform sampler2D sampler2d; // value of sampler2d = 3
   3 varying vec3 lightDir;       // interpolated surface local coordinate light
   4                              // direction
   5 varying vec3 viewDir;        // interpolated surface local coordinate view
   6                              // direction
   7
   8 const float diffuseFactor  = 0.7;
   9 const float specularFactor = 0.7;
  10 vec3 basecolor = vec3 (0.8, 0.7, 0.3);
  11
  12 void main (void)
  13 {
  14     vec3 norm;
  15     vec3 r;
  16     vec3 color;
  17     float intensity;
  18     float spec;
  19     float d;
  20
  21     // Fetch normal from normal map
  22     norm = vec3(texture2D(sampler2d, vec2 (gl_TexCoord[0])));
  23     norm = (norm - 0.5) * 2.0;
  24     norm.y = -norm.y;
  25     intensity = max(dot(lightDir, norm), 0.0) * diffuseFactor;
  26
  27     // Compute specular reflection component
  28     d = 2.0 * dot(lightDir, norm);
  29     r = d * norm;
  30     r = lightDir - r;
  31     spec = pow(max(dot(r, viewDir), 0.0) , 6.0) * specularFactor;
  32     intensity += min (spec, 1.0);
  33
  34     // Compute final color value
  35     color = clamp(basecolor * intensity, 0.0, 1.0);
  36
  37     // Write out final fragment color
  38     gl_FragColor = vec4 (color, 1.0);
  39 }