shaderlib/phong.glsl

   1 import msp_interface;
   2 import common;
   3 import shadow;
   4
   5 const bool use_diffuse_map = false;
   6 const bool use_specular = false;
   7 const bool use_specular_map = false;
   8 const bool use_shininess_map = false;
   9 const bool use_emission = false;
  10 const bool use_emission_map = false;
  11 const bool use_reflectivity = false;
  12 const bool use_reflectivity_map = false;
  13 const bool use_sky = false;
  14 const bool use_fog = false;
  15
  16 #pragma MSP stage(fragment)
  17 vec4 get_diffuse_color()
  18 {
  19         if(use_diffuse_map)
  20                 return texture(diffuse_map, texcoord.xy);
  21         else
  22                 return basic_material.diffuse;
  23 }
  24
  25 vec3 get_specular_color()
  26 {
  27         if(use_specular_map)
  28                 return texture(specular_map, texcoord.xy).rgb;
  29         else
  30                 return basic_material.specular.rgb;
  31 }
  32
  33 float get_shininess_value()
  34 {
  35         if(use_shininess_map)
  36                 return texture(shininess_map, texcoord.xy).r*255.0;
  37         else
  38                 return basic_material.shininess;
  39 }
  40
  41 vec3 get_emission_color()
  42 {
  43         if(use_emission_map)
  44                 return texture(emission_map, texcoord.xy).rgb;
  45         else
  46                 return basic_material.emission.rgb;
  47 }
  48
  49 float get_reflectivity_value()
  50 {
  51         if(use_reflectivity_map)
  52                 return texture(reflectivity_map, texcoord.xy).r;
  53         else
  54                 return basic_material.reflectivity;
  55 }
  56
  57 vec3 phong_ambient(vec3 surface_diffuse)
  58 {
  59         return ambient_color.rgb*surface_diffuse;
  60 }
  61
  62 vec3 phong_one_light(vec3 light, vec3 normal, vec3 look, vec3 light_color, vec3 surface_diffuse, vec3 surface_specular, float shininess)
  63 {
  64         float diffuse_intensity = max(dot(light, normal), 0.0);
  65         vec3 color = light_color*surface_diffuse*diffuse_intensity;
  66         if(use_specular)
  67         {
  68                 /* The light vector points towards the light, so reflected will point
  69                 towards the surface - but so does the look vector. */
  70                 vec3 reflected = reflect(light, normal);
  71                 float specular_intensity = pow(max(dot(reflected, look), 0.0), shininess);
  72                 color += light_color*surface_specular*specular_intensity;
  73         }
  74         return color;
  75 }
  76
  77 vec3 phong_lighting(vec3 normal, vec3 look, vec3 surface_diffuse, vec3 surface_specular, float shininess)
  78 {
  79         vec3 light;
  80         if(use_normal_map)
  81                 light = normalize(tbn_light_dir);
  82         else
  83                 light = normalize(eye_light_dir);
  84
  85         vec3 color = phong_ambient(surface_diffuse);
  86         float shadow = get_shadow_factor(0);
  87         color += phong_one_light(light, normal, look, light_sources[0].diffuse.rgb, surface_diffuse, surface_specular, shininess)*shadow;
  88
  89         if(use_emission)
  90                 color += get_emission_color();
  91
  92         if(use_reflectivity)
  93                 color += get_reflection(normal, look)*get_reflectivity_value();
  94
  95         return color;
  96 }
  97
  98 void main()
  99 {
 100         vec3 normal;
 101         vec3 look;
 102         if(use_normal_map)
 103         {
 104                 normal = get_fragment_normal();
 105                 look = normalize(tbn_look_dir);
 106         }
 107         else
 108         {
 109                 normal = normalize(eye_normal);
 110                 look = normalize(eye_look_dir);
 111         }
 112
 113         vec4 surface_diffuse = get_diffuse_color();
 114         vec3 surface_specular = get_specular_color();
 115         float shininess = get_shininess_value();
 116
 117         vec3 lit_color = phong_lighting(normal, look, surface_diffuse.rgb, surface_specular, shininess);
 118
 119         frag_color = vec4(lit_color, surface_diffuse.a);
 120 }