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    float g_time;
  13    int g_light_count;
  14    int g_light_preview;
  15    int g_shadow_samples;
  16
  17    // g_time ?
  18
  19    //vec4 g_point_light_positions[32];
  20    //vec4 g_point_light_colours[32];
  21 };
  22
  23 uniform sampler2D g_world_depth;
  24
  25 float world_depth_sample( vec3 pos )
  26 {
  27    vec2 depth_coord = (pos.xz - g_depth_bounds.xy) * g_depth_bounds.zw;
  28    return texture( g_world_depth, depth_coord ).r;
  29 }
  30
  31 float world_water_depth( vec3 pos )
  32 {
  33    vec2 depth_coord = (pos.xz - g_depth_bounds.xy) * g_depth_bounds.zw;
  34    float ref_depth = g_water_plane.y*g_water_plane.w;
  35    return texture( g_world_depth, depth_coord ).g - ref_depth;
  36 }
  37
  38 float shadow_sample( vec3 vdir )
  39 {
  40    vec3 sample_pos = aWorldCo + vdir;
  41    float height_sample = world_depth_sample( sample_pos );
  42
  43    float fdelta = height_sample - sample_pos.y;
  44    return clamp( fdelta, 0.1, 0.2 )-0.1;
  45 }
  46
  47 vec3 apply_fog( vec3 vfrag, float fdist )
  48 {
  49    float dist = pow(fdist*0.0008,1.2);
  50    return mix( vfrag, vec3(0.55,0.76,1.0), min( 1.0, dist ) );
  51 }
  52
  53
  54 // New lighting model
  55
  56 vec3 newlight_compute_ambient()
  57 {
  58    return g_ambient_colour.rgb;
  59 }
  60
  61 float newlight_compute_sun_shadow( vec3 dir )
  62 {
  63    if( g_shadow_samples == 0 )
  64    {
  65       return 1.0;
  66    }
  67
  68    float fspread = g_light_colours[0].w;
  69    vec3  vdir = dir;
  70    float flength = g_light_directions[0].w;
  71
  72    float famt = 0.0;
  73    famt+=shadow_sample((vdir+vec3(-0.563, 0.550, 0.307)*fspread)*flength*0.1);
  74    famt+=shadow_sample((vdir+vec3( 0.808, 0.686, 0.346)*fspread)*flength*0.2);
  75    famt+=shadow_sample((vdir+vec3( 0.787, 0.074,-0.065)*fspread)*flength*0.3);
  76    famt+=shadow_sample((vdir+vec3(-0.593, 0.071,-0.425)*fspread)*flength*0.4);
  77    famt+=shadow_sample((vdir+vec3(-0.790,-0.933,-0.875)*fspread)*flength*0.5);
  78    famt+=shadow_sample((vdir+vec3( 0.807,-0.690, 0.472)*fspread)*flength*0.6);
  79    famt+=shadow_sample((vdir+vec3( 0.522,-0.379, 0.350)*fspread)*flength*0.7);
  80    famt+=shadow_sample((vdir+vec3( 0.483, 0.201, 0.306)*fspread)*flength*0.8);
  81
  82    return 1.0 - famt;
  83 }
  84
  85 vec3 newlight_compute_world_diffuse( vec3 wnormal )
  86 {
  87    vec3 vtotal = g_ambient_colour.rgb;
  88
  89    for( int i=0; i<g_light_count; i++ )
  90    {
  91       vec3 vcolour = g_light_colours[i].rgb;
  92       vec3 vdir = g_light_directions[i].xyz;
  93
  94       float flight = max(dot( vdir, wnormal )*0.75+0.25,0.0);
  95       vtotal += vcolour*flight;
  96    }
  97
  98    return vtotal;
  99 }
 100
 101 vec3 newlight_compute_sun_spec( vec3 wnormal, vec3 halfview, float fintensity )
 102 {
 103    vec3 vcolour = g_light_colours[0].rgb;
 104    vec3 vdir = g_light_directions[0].xyz;
 105
 106    vec3 specdir = reflect( -vdir, wnormal );
 107    float spec = pow(max(dot( halfview, specdir ), 0.0), 10.0);
 108    return vcolour*spec*fintensity;
 109 }
 110
 111 float newlight_specular( vec3 wnormal, vec3 dir, vec3 halfview, float exponent )
 112 {
 113    vec3 specdir = reflect( -dir, wnormal );
 114    return pow(max(dot( halfview, specdir ), 0.0), exponent);
 115 }
 116
 117 vec3 newlight_compute_quadratic( vec3 wnormal, vec3 halfview,
 118                                  vec3 light_colour, vec3 light_pos )
 119 {
 120    vec3 light_delta = (light_pos-aWorldCo) * 10.0;
 121
 122    float quadratic = dot(light_delta,light_delta);
 123    float attenuation = 1.0f/( 1.0f + quadratic );
 124    attenuation *= max( 0.0, dot( normalize(light_delta), wnormal ) );
 125
 126    return light_colour*attenuation;
 127 }
 128
 129 vec3 newlight_compute_spot( vec3 wnormal, vec3 halfview,
 130                             vec3 light_colour, vec3 light_pos,
 131                             vec4 light_dir )
 132 {
 133    vec3 light_delta = (light_pos-aWorldCo) * 10.0;
 134
 135    float quadratic = dot(light_delta,light_delta);
 136    float attenuation = 1.0f/( 1.0f + quadratic );
 137
 138    light_delta = normalize( light_delta );
 139    attenuation *= max( 0.0, dot( light_delta, wnormal ) );
 140
 141    float spot_theta = max( 0.0, dot( light_delta, -light_dir.xyz ) ),
 142             falloff = max( 0.0,( spot_theta - light_dir.w ) / (1.0-light_dir.w) );
 143
 144    return light_colour*attenuation*falloff;
 145 }