shaders/scene_water_fast.fs

   1 uniform sampler2D uTexDudv;
   2
   3 uniform float uTime;
   4 uniform vec3 uCamera;
   5 uniform float uSurfaceY;
   6 uniform vec3 uBoard0;
   7 uniform vec3 uBoard1;
   8
   9 uniform vec3 uShoreColour;
  10 uniform vec3 uOceanColour;
  11
  12 #include "light_clearskies_stddef.glsl"
  13 #include "common_scene.glsl"
  14 #include "motion_vectors_fs.glsl"
  15
  16 vec4 water_surf( vec3 halfview, vec3 vnorm, float depthvalue )
  17 {
  18    vec3 surface_tint = mix(uShoreColour, uOceanColour, depthvalue);
  19
  20    float ffresnel = pow(1.0-dot( vnorm, halfview ),5.0);
  21
  22    vec3 lightdir = vec3(0.95,0.0,-0.3);
  23    vec3 specdir = reflect( -lightdir, vnorm );
  24    float spec = pow(max(dot(halfview,specdir),0.0),20.0)*0.3;
  25
  26    return vec4( surface_tint + spec, max(min(depthvalue*4.0, 1.0),0.0) );
  27 }
  28
  29 void main()
  30 {
  31    compute_motion_vectors();
  32
  33    // Surface colour composite
  34    float depthvalue = clamp( -world_water_depth( aCo )*(1.0/25.0), 0.0, 1.0 );
  35
  36    vec2 world_coord = aCo.xz * 0.008;
  37    vec4 time_offsets = vec4( uTime ) * vec4( 0.008, 0.006, 0.003, 0.03 );
  38    vec4 dudva = texture( uTexDudv, world_coord + time_offsets.xy )-0.5;
  39    vec4 dudvb = texture( uTexDudv, world_coord *7.0 - time_offsets.zw )-0.5;
  40
  41    vec3 surfnorm = dudva.rgb + dudvb.rgb;
  42    surfnorm = normalize(vec3(0.0,1.0,0.0) + dudva.xyz*0.4 + dudvb.xyz*0.1);
  43
  44    // Foam
  45    float fband = fract( aCo.z*0.02+uTime*0.1+depthvalue*10.0 );
  46    fband = step( fband+dudva.a*0.8, 0.3 ) * max((1.0-depthvalue*4.0),0.0);
  47
  48    // Lighting
  49    vec3 halfview = -normalize( aCo-uCamera );
  50
  51    // Fog
  52    float fdist = pow(length( aCo.xz-uCamera.xz ) * 0.00047, 2.6);
  53
  54    // Composite
  55    vec4 vsurface = water_surf( halfview, surfnorm, depthvalue );
  56    vsurface.a -= fdist;
  57    oColour = mix( vsurface, vec4(1.0,1.0,1.0,0.5), fband );
  58 }