shaders/common_world.glsl

   1 layout (location = 0) out vec4 oColour;
   2
   3 layout (std140) uniform ub_world_lighting
   4 {
   5    vec4 g_cube_min;
   6    vec4 g_cube_inv_range;
   7
   8    vec4 g_light_colours[3];
   9    vec4 g_light_directions[3];
  10    vec4 g_ambient_colour;
  11
  12    vec4 g_water_plane;
  13    vec4 g_depth_bounds;
  14    float g_water_fog;
  15    float g_time;
  16    int g_light_count;
  17    int g_light_preview;
  18    int g_shadow_samples;
  19
  20    int g_debug_indices;
  21    int g_debug_complexity;
  22
  23    // g_time ?
  24
  25    //vec4 g_point_light_positions[32];
  26    //vec4 g_point_light_colours[32];
  27 };
  28
  29 uniform sampler2D g_world_depth;
  30
  31 float world_depth_sample( vec3 pos )
  32 {
  33    vec2 depth_coord = (pos.xz - g_depth_bounds.xy) * g_depth_bounds.zw;
  34    return texture( g_world_depth, depth_coord ).r;
  35 }
  36
  37 float world_water_depth( vec3 pos )
  38 {
  39    vec2 depth_coord = (pos.xz - g_depth_bounds.xy) * g_depth_bounds.zw;
  40    float ref_depth = g_water_plane.y*g_water_plane.w;
  41    return texture( g_world_depth, depth_coord ).g - ref_depth;
  42 }
  43
  44 float shadow_sample( vec3 vdir )
  45 {
  46    vec3 sample_pos = aWorldCo + vdir;
  47    float height_sample = world_depth_sample( sample_pos );
  48
  49    float fdelta = height_sample - sample_pos.y;
  50    return clamp( fdelta, 0.1, 0.2 )-0.1;
  51 }
  52
  53 vec3 apply_fog( vec3 vfrag, float fdist )
  54 {
  55    float dist = pow(fdist*0.0008,1.2);
  56    return mix( vfrag, vec3(0.55,0.76,1.0), min( 1.0, dist ) );
  57 }
  58
  59
  60 // New lighting model
  61
  62 vec3 newlight_compute_ambient()
  63 {
  64    return g_ambient_colour.rgb;
  65 }
  66
  67 float newlight_compute_sun_shadow( vec3 dir )
  68 {
  69    if( g_shadow_samples == 0 )
  70    {
  71       return 1.0;
  72    }
  73
  74    float fspread = g_light_colours[0].w;
  75    vec3  vdir = dir;
  76    float flength = g_light_directions[0].w;
  77
  78    float famt = 0.0;
  79    famt+=shadow_sample((vdir+vec3(-0.563, 0.550, 0.307)*fspread)*flength*0.1);
  80    famt+=shadow_sample((vdir+vec3( 0.808, 0.686, 0.346)*fspread)*flength*0.2);
  81    famt+=shadow_sample((vdir+vec3( 0.787, 0.074,-0.065)*fspread)*flength*0.3);
  82    famt+=shadow_sample((vdir+vec3(-0.593, 0.071,-0.425)*fspread)*flength*0.4);
  83    famt+=shadow_sample((vdir+vec3(-0.790,-0.933,-0.875)*fspread)*flength*0.5);
  84    famt+=shadow_sample((vdir+vec3( 0.807,-0.690, 0.472)*fspread)*flength*0.6);
  85    famt+=shadow_sample((vdir+vec3( 0.522,-0.379, 0.350)*fspread)*flength*0.7);
  86    famt+=shadow_sample((vdir+vec3( 0.483, 0.201, 0.306)*fspread)*flength*0.8);
  87
  88    return 1.0 - famt;
  89 }
  90
  91 vec3 newlight_compute_world_diffuse( vec3 wnormal )
  92 {
  93    vec3 vtotal = g_ambient_colour.rgb;
  94
  95    for( int i=0; i<g_light_count; i++ )
  96    {
  97       vec3 vcolour = g_light_colours[i].rgb;
  98       vec3 vdir = g_light_directions[i].xyz;
  99
 100       float flight = max(dot( vdir, wnormal )*0.75+0.25,0.0);
 101       vtotal += vcolour*flight;
 102    }
 103
 104    return vtotal;
 105 }
 106
 107 vec3 newlight_compute_sun_spec( vec3 wnormal, vec3 halfview, float fintensity )
 108 {
 109    vec3 vcolour = g_light_colours[0].rgb;
 110    vec3 vdir = g_light_directions[0].xyz;
 111
 112    vec3 specdir = reflect( -vdir, wnormal );
 113    float spec = pow(max(dot( halfview, specdir ), 0.0), 10.0);
 114    return vcolour*spec*fintensity;
 115 }
 116
 117 float newlight_specular( vec3 wnormal, vec3 dir, vec3 halfview, float exponent )
 118 {
 119    vec3 specdir = reflect( -dir, wnormal );
 120    return pow(max(dot( halfview, specdir ), 0.0), exponent);
 121 }
 122
 123 vec3 newlight_compute_quadratic( vec3 wnormal, float max_dist,
 124                                  vec3 light_colour, vec3 light_pos )
 125 {
 126    vec3 light_delta = light_pos-aWorldCo;
 127
 128    float dist2 = dot(light_delta,light_delta);
 129
 130    float quadratic = dist2*100.0;
 131    float attenuation  = 1.0f/( 1.0f + quadratic );
 132          attenuation *= max( dot( normalize(light_delta), wnormal ), 0.0 );
 133
 134    float falloff = max( 0.0, 1.0-(dist2*max_dist) );
 135    return light_colour * attenuation * falloff;
 136 }
 137
 138 vec3 newlight_compute_spot( vec3 wnormal, vec3 halfview,
 139                             vec3 light_colour, vec3 light_pos,
 140                             vec4 light_dir )
 141 {
 142    vec3 light_delta = (light_pos-aWorldCo) * 10.0;
 143
 144    float quadratic = dot(light_delta,light_delta);
 145    float attenuation = 1.0f/( 1.0f + quadratic );
 146
 147    light_delta = normalize( light_delta );
 148    attenuation *= max( 0.0, dot( light_delta, wnormal ) );
 149
 150    float spot_theta = max( 0.0, dot( light_delta, -light_dir.xyz ) ),
 151             falloff = max( 0.0,( spot_theta - light_dir.w ) / (1.0-light_dir.w) );
 152
 153    return light_colour*attenuation*falloff;
 154 }