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