Dogcows Code - chaz/rasterize/blob - fragment.glsl

   1
   2 /*
   3  * CS5600 University of Utah
   4  * Charles McGarvey
   5  * mcgarvey@eng.utah.edu
   6  */
   7
   8 #define MAX_LIGHTS 2
   9
  10 uniform int     numLights;
  11 uniform vec4    ambient;
  12 uniform vec4    mspecular;
  13 uniform float   shininess;
  14 uniform vec4    diffuse[MAX_LIGHTS];
  15 uniform vec4    specular[MAX_LIGHTS];
  16 uniform sampler2D sampler;
  17 uniform bool    isTexture;
  18
  19 varying vec3    normal;
  20 varying vec2    textureCoord;
  21 varying vec4    color;
  22 varying vec3    lightDir[MAX_LIGHTS];
  23 varying vec3    eyeVec;
  24
  25 void main()
  26 {
  27     gl_FragColor = vec4(0.0, 0.0, 0.0, 1.0);
  28
  29     vec4 c = color;
  30     if (isTexture) {
  31         c *= texture2D(sampler, vec2(textureCoord.x, 1.0 - textureCoord.y));
  32     }
  33
  34     vec3 N = normalize(normal);
  35     int i;
  36     for (i = 0; i < numLights; ++i) {
  37         vec3 L = normalize(lightDir[i]);
  38         float kd = dot(N, L);
  39         if (0.0 < kd) {
  40             gl_FragColor += diffuse[i] * c * kd;
  41             vec3 E = normalize(eyeVec);
  42             vec3 R = reflect(-L, N);
  43             float ks = pow(max(dot(R, E), 0.0), shininess);
  44             gl_FragColor += specular[i] * mspecular * ks;
  45         }
  46     }
  47     gl_FragColor += ambient * c;
  48
  49     gl_FragColor.a = color.a;       // preserve the model's alpha
  50 }
  51