shaders/common_world.glsl

   1 layout (std140) uniform ub_world_lighting
   2 {
   3    vec3 g_directional;
   4    vec3 g_sun_colour;
   5    vec3 g_shadow_colour;
   6    vec4 g_water_plane;
   7    vec4 g_depth_bounds;
   8    float g_water_fog;
   9 };
  10
  11 uniform sampler2D g_world_depth;
  12
  13 // Standard diffuse + spec models
  14 // ==============================
  15
  16 vec3 do_light_diffuse( vec3 vfrag, vec3 wnormal )
  17 {
  18    float flight = dot( g_directional, wnormal )*0.5+0.5;
  19    return vfrag * mix( g_shadow_colour, g_sun_colour, flight );
  20 }
  21
  22 vec3 do_light_spec( vec3 vfrag, vec3 wnormal, vec3 halfview, float fintensity )
  23 {
  24    vec3 specdir = reflect( -g_directional, wnormal );
  25    float spec = pow(max(dot( halfview, specdir ), 0.0), 10.0);
  26    return vfrag + g_sun_colour*spec*fintensity;
  27 }
  28
  29 float world_depth_sample( vec3 pos )
  30 {
  31    vec2 depth_coord = (pos.xz - g_depth_bounds.xy) * g_depth_bounds.zw;
  32    return texture( g_world_depth, depth_coord ).r;
  33 }
  34
  35 float shadow_sample( vec3 vdir )
  36 {
  37    vec3 sample_pos = aCo + vdir;
  38    float height_sample = world_depth_sample( sample_pos );
  39
  40    float fdelta = height_sample - sample_pos.y;
  41    return clamp( fdelta, 0.1, 0.2 )-0.1;
  42 }
  43
  44 vec3 do_light_shadowing( vec3 vfrag )
  45 {
  46    float faccum = 0.0;
  47    faccum += shadow_sample( vec3( 0.0, 0.5, 0.0 ));
  48    faccum += shadow_sample( vec3( 2.0, 0.3, 0.0 ));
  49    faccum += shadow_sample( vec3( 3.0, 1.0, 0.0 ));
  50    faccum += shadow_sample( vec3( 5.0, 1.0, 0.0 ));
  51    faccum += shadow_sample( vec3( 0.0, 0.5, 0.0 )*1.5);
  52    faccum += shadow_sample( vec3( 2.0, 0.3, 0.0 )*1.5);
  53    faccum += shadow_sample( vec3( 3.0, 1.0, 0.0 )*1.5);
  54    faccum += shadow_sample( vec3( 5.0, 1.0, 0.0 )*1.5);
  55    return mix( vfrag, g_shadow_colour, faccum );
  56 }
  57