shaderlib/phong.glsl

   1 import msp_interface;
   2 import common;
   3 import shadow;
   4
   5 struct BasicMaterialParameters
   6 {
   7         vec4 diffuse;
   8         vec4 specular;
   9         vec4 emission;
  10         float shininess;
  11         float reflectivity;
  12 };
  13
  14 uniform BasicMaterial
  15 {
  16         BasicMaterialParameters basic_material;
  17 };
  18
  19 uniform sampler2D diffuse_map;
  20 uniform sampler2D specular_map;
  21 uniform sampler2D shininess_map;
  22 uniform sampler2D emission_map;
  23 uniform sampler2D reflectivity_map;
  24
  25 layout(constant_id=auto) const bool use_diffuse_map = false;
  26 layout(constant_id=auto) const bool use_specular = false;
  27 layout(constant_id=auto) const bool use_specular_map = false;
  28 layout(constant_id=auto) const bool use_shininess_map = false;
  29 layout(constant_id=auto) const bool use_emission = false;
  30 layout(constant_id=auto) const bool use_emission_map = false;
  31 layout(constant_id=auto) const bool use_reflectivity = false;
  32 layout(constant_id=auto) const bool use_reflectivity_map = false;
  33 layout(constant_id=auto) const bool use_sky = false;
  34 layout(constant_id=auto) const bool use_fog = false;
  35
  36 #pragma MSP stage(fragment)
  37 virtual vec4 get_diffuse_color()
  38 {
  39         if(use_diffuse_map)
  40                 return texture(diffuse_map, texcoord.xy);
  41         else
  42                 return basic_material.diffuse;
  43 }
  44
  45 virtual vec3 get_specular_color()
  46 {
  47         if(use_specular_map)
  48                 return texture(specular_map, texcoord.xy).rgb;
  49         else
  50                 return basic_material.specular.rgb;
  51 }
  52
  53 virtual float get_shininess_value()
  54 {
  55         if(use_shininess_map)
  56                 return texture(shininess_map, texcoord.xy).r*255.0;
  57         else
  58                 return basic_material.shininess;
  59 }
  60
  61 virtual vec3 get_emission_color()
  62 {
  63         if(use_emission_map)
  64                 return texture(emission_map, texcoord.xy).rgb;
  65         else
  66                 return basic_material.emission.rgb;
  67 }
  68
  69 virtual float get_reflectivity_value()
  70 {
  71         if(use_reflectivity_map)
  72                 return texture(reflectivity_map, texcoord.xy).r;
  73         else
  74                 return basic_material.reflectivity;
  75 }
  76
  77 vec3 phong_ambient(vec3 surface_diffuse)
  78 {
  79         return ambient_color.rgb*surface_diffuse;
  80 }
  81
  82 vec3 phong_one_light(vec3 light, vec3 normal, vec3 look, vec3 light_color, vec3 surface_diffuse, vec3 surface_specular, float shininess)
  83 {
  84         float diffuse_intensity = max(dot(light, normal), 0.0);
  85         vec3 color = light_color*surface_diffuse*diffuse_intensity;
  86         if(use_specular)
  87         {
  88                 vec3 reflected = reflect(look, normal);
  89                 float specular_intensity = pow(max(dot(reflected, light), 0.0), shininess);
  90                 color += light_color*surface_specular*specular_intensity;
  91         }
  92         return color;
  93 }
  94
  95 vec3 phong_lighting(vec3 normal, vec3 look, vec3 surface_diffuse, vec3 surface_specular, float shininess)
  96 {
  97         vec3 color = phong_ambient(surface_diffuse);
  98         for(int i=0; i<max_lights; ++i)
  99                 if(light_sources[i].type!=0)
 100                 {
 101                         vec3 light = get_light_direction(i);
 102                         float shadow = get_shadow_factor(i);
 103                         color += phong_one_light(light, normal, look, light_sources[i].color, surface_diffuse, surface_specular, shininess)*shadow;
 104                 }
 105
 106         if(use_emission)
 107                 color += get_emission_color();
 108
 109         if(use_reflectivity)
 110                 color += get_reflection(normal, look)*get_reflectivity_value();
 111
 112         return color;
 113 }
 114
 115 void main()
 116 {
 117         vec3 normal = get_fragment_normal();
 118         vec3 look = normalize(world_look_dir);
 119
 120         vec4 surface_diffuse = get_diffuse_color();
 121         vec3 surface_specular = get_specular_color();
 122         float shininess = get_shininess_value();
 123
 124         vec3 lit_color = phong_lighting(normal, look, surface_diffuse.rgb, surface_specular, shininess);
 125
 126         frag_color = vec4(lit_color, surface_diffuse.a);
 127 }