shaders/common_world.glsl

   1 layout (location = 0) out vec4 oColour;
   2
   3 layout (std140) uniform ub_world_lighting
   4 {
   5    vec4 g_light_colours[3];
   6    vec4 g_light_directions[3];
   7    vec4 g_ambient_colour;
   8
   9    vec4 g_water_plane;
  10    vec4 g_depth_bounds;
  11    float g_water_fog;
  12    int g_light_count;
  13    int g_light_preview;
  14    int g_shadow_samples;
  15 };
  16
  17 uniform sampler2D g_world_depth;
  18
  19 // Standard diffuse + spec models
  20 // ==============================
  21
  22 vec3 do_light_diffuse( vec3 vfrag, vec3 wnormal )
  23 {
  24    vec3 vtotal = g_ambient_colour.rgb;
  25
  26    for( int i=0; i<g_light_count; i++ )
  27    {
  28       vec3 vcolour = g_light_colours[i].rgb;
  29       vec3 vdir = g_light_directions[i].xyz;
  30
  31       float flight = max(dot( vdir, wnormal )*0.75+0.25,0.0);
  32       vtotal += vcolour*flight;
  33    }
  34
  35    return vfrag * vtotal;
  36 }
  37
  38 vec3 do_light_spec( vec3 vfrag, vec3 wnormal, vec3 halfview, float fintensity )
  39 {
  40    vec3 vcolour = g_light_colours[0].rgb;
  41    vec3 vdir = g_light_directions[0].xyz;
  42
  43    vec3 specdir = reflect( -vdir, wnormal );
  44    float spec = pow(max(dot( halfview, specdir ), 0.0), 10.0);
  45    return vfrag + vcolour*spec*fintensity;
  46 }
  47
  48 float world_depth_sample( vec3 pos )
  49 {
  50    vec2 depth_coord = (pos.xz - g_depth_bounds.xy) * g_depth_bounds.zw;
  51    return texture( g_world_depth, depth_coord ).r;
  52 }
  53
  54 float shadow_sample( vec3 vdir )
  55 {
  56    vec3 sample_pos = aWorldCo + vdir;
  57    float height_sample = world_depth_sample( sample_pos );
  58
  59    float fdelta = height_sample - sample_pos.y;
  60    return clamp( fdelta, 0.1, 0.2 )-0.1;
  61 }
  62
  63 vec3 do_light_shadowing_old( vec3 vfrag )
  64 {
  65    float faccum = 0.0;
  66    faccum += shadow_sample( vec3( 0.0, 0.5, 0.0 ));
  67    faccum += shadow_sample( vec3( 2.0, 0.3, 0.0 ));
  68    faccum += shadow_sample( vec3( 3.0, 1.0, 0.0 ));
  69    faccum += shadow_sample( vec3( 5.0, 1.0, 0.0 ));
  70    faccum += shadow_sample( vec3( 0.0, 0.5, 0.0 )*1.5);
  71    faccum += shadow_sample( vec3( 2.0, 0.3, 0.0 )*1.5);
  72    faccum += shadow_sample( vec3( 3.0, 1.0, 0.0 )*1.5);
  73    faccum += shadow_sample( vec3( 5.0, 1.0, 0.0 )*1.5);
  74    return mix( vfrag, g_ambient_colour.rgb, faccum );
  75 }
  76
  77 // FIXME
  78 float sdLine( vec3 p, vec3 a, vec3 b )
  79 {
  80   vec3 pa = p - a;
  81   vec3 ba = b - a;
  82
  83   float h = clamp( dot(pa,ba)/dot(ba,ba), 0.0, 1.0 );
  84   return length( pa - ba*h );
  85 }
  86
  87 vec3 do_light_shadowing( vec3 vfrag )
  88 {
  89    if( g_shadow_samples == 0 )
  90    {
  91       return vfrag;
  92    }
  93
  94    float fspread = g_light_colours[0].w;
  95    vec3  vdir = g_light_directions[0].xyz;
  96    float flength = g_light_directions[0].w;
  97
  98    float famt = 0.0;
  99    famt+=shadow_sample((vdir+vec3(-0.563, 0.550, 0.307)*fspread)*flength*0.1);
 100    famt+=shadow_sample((vdir+vec3( 0.808, 0.686, 0.346)*fspread)*flength*0.2);
 101    famt+=shadow_sample((vdir+vec3( 0.787, 0.074,-0.065)*fspread)*flength*0.3);
 102    famt+=shadow_sample((vdir+vec3(-0.593, 0.071,-0.425)*fspread)*flength*0.4);
 103    famt+=shadow_sample((vdir+vec3(-0.790,-0.933,-0.875)*fspread)*flength*0.5);
 104    famt+=shadow_sample((vdir+vec3( 0.807,-0.690, 0.472)*fspread)*flength*0.6);
 105    famt+=shadow_sample((vdir+vec3( 0.522,-0.379, 0.350)*fspread)*flength*0.7);
 106    famt+=shadow_sample((vdir+vec3( 0.483, 0.201, 0.306)*fspread)*flength*0.8);
 107
 108    // player shadow
 109    float dist_to_player = max( 0.0, sdLine( aWorldCo, uBoard0, uBoard1 )-0.03 );
 110    float player_shadow = max( 1.0-dist_to_player*1.7, 0.0 );
 111    player_shadow *= player_shadow*player_shadow*player_shadow;
 112
 113    famt = max( player_shadow*0.6, famt );
 114    return mix( vfrag, g_ambient_colour.rgb, famt );
 115 }
 116
 117 vec3 apply_fog( vec3 vfrag, float fdist )
 118 {
 119    float dist = pow(fdist*0.0008,1.2);
 120    return mix( vfrag, vec3(0.55,0.76,1.0), min( 1.0, dist ) );
 121 }