shaderlib/common.glsl

   1 import msp_interface;
   2 import shadow;
   3
   4 uniform EnvMap
   5 {
   6         mat3 env_world_matrix;
   7 };
   8
   9 uniform sampler2D normal_map;
  10 uniform samplerCube environment_map;
  11 uniform samplerCube irradiance_map;
  12
  13 layout(constant_id=auto) const bool use_normal_map = false;
  14
  15 #pragma MSP stage(vertex)
  16 virtual vec4 get_vertex_position()
  17 {
  18         return vertex;
  19 }
  20
  21 virtual vec3 get_vertex_normal()
  22 {
  23         return normal;
  24 }
  25
  26 virtual mat4 get_vertex_transform()
  27 {
  28         return world_obj_matrix;
  29 }
  30
  31 virtual mat3 get_normal_transform()
  32 {
  33         return world_obj_normal_matrix;
  34 }
  35
  36 void standard_transform()
  37 {
  38         mat4 vertex_tf = get_vertex_transform();
  39         mat3 normal_tf = get_normal_transform();
  40
  41         vec4 world_vertex = vertex_tf*get_vertex_position();
  42         vec4 eye_vertex = eye_world_matrix*world_vertex;
  43         gl_Position = clip_eye_matrix*eye_vertex;
  44
  45         out vec3 world_normal = normal_tf*get_vertex_normal();
  46         vec3 world_tangent = normal_tf*tangent;
  47         vec3 world_binormal = cross(world_normal, world_tangent);
  48         out mat3 world_tbn_matrix = mat3(world_tangent, world_binormal, world_normal);
  49
  50         vec3 eye_pos = (inverse(eye_world_matrix)*vec4(0.0, 0.0, 0.0, 1.0)).xyz;
  51         out vec3 world_look_dir = normalize(world_vertex.xyz-eye_pos);
  52
  53         out vec3 world_light_dir = light_sources[0].position.xyz-world_vertex.xyz*light_sources[0].position.w;
  54
  55         out vec3 world_halfway_dir = normalize(world_light_dir-world_look_dir);
  56
  57         out float fog_coord = eye_vertex.z;
  58
  59         if(use_clipping)
  60         {
  61                 for(int i=0; i<max_clip_planes; ++i)
  62                         gl_ClipDistance[i] = dot(world_vertex, clip_planes[i].equation);
  63         }
  64
  65         shadow_transform(world_vertex);
  66 }
  67
  68 virtual void custom_transform()
  69 {
  70 }
  71
  72 void main()
  73 {
  74         standard_transform();
  75         custom_transform();
  76         passthrough;
  77 }
  78
  79 #pragma MSP stage(fragment)
  80 virtual vec3 get_fragment_normal()
  81 {
  82         if(use_normal_map)
  83                 return normalize(world_tbn_matrix*(texture(normal_map, texcoord.xy).xyz*2.0-1.0));
  84         else
  85                 return normalize(world_normal);
  86 }
  87
  88 virtual vec3 get_environment_sample(vec3 direction, float roughness)
  89 {
  90         float lod = (2-roughness)*roughness*(textureQueryLevels(environment_map)-1);
  91         return textureLod(environment_map, env_world_matrix*direction, lod).rgb;
  92 }
  93
  94 virtual vec3 get_reflection(vec3 normal, vec3 look)
  95 {
  96         vec3 reflect_dir = reflect(look, normal);
  97         return get_environment_sample(reflect_dir, 0.0);
  98 }
  99
 100 virtual vec3 get_irradiance_sample(vec3 normal)
 101 {
 102         return texture(irradiance_map, env_world_matrix*normal).rgb;
 103 }
 104
 105 vec3 apply_fog(vec3 color)
 106 {
 107         float fog_value = exp(fog_coord*fog_density);
 108         return mix(fog_color.rgb, color, fog_value);
 109 }