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 in vec2 aUv;
  13 in vec4 aNorm;
  14 in vec3 aCo;
  15 in vec3 aWorldCo;
  16 flat in ivec4 aLights;
  17
  18 #include "common_scene.glsl"
  19 #include "motion_vectors_fs.glsl"
  20
  21 vec4 water_surf( vec3 halfview, vec3 vnorm, float depthvalue )
  22 {
  23    vec3 surface_tint = mix(uShoreColour, uOceanColour, depthvalue);
  24
  25    float ffresnel = pow(1.0-dot( vnorm, halfview ),5.0);
  26
  27    vec3 lightdir = vec3(0.95,0.0,-0.3);
  28    vec3 specdir = reflect( -lightdir, vnorm );
  29    float spec = pow(max(dot(halfview,specdir),0.0),20.0)*0.3;
  30
  31    return vec4( surface_tint + spec, max(min(depthvalue*4.0, 1.0),0.0) );
  32 }
  33
  34 void main()
  35 {
  36    compute_motion_vectors();
  37
  38    // Surface colour composite
  39    float depthvalue = clamp( -world_water_depth( aCo )*(1.0/25.0), 0.0, 1.0 );
  40
  41    vec2 world_coord = aCo.xz * 0.008;
  42    vec4 time_offsets = vec4( uTime ) * vec4( 0.008, 0.006, 0.003, 0.03 );
  43    vec4 dudva = texture( uTexDudv, world_coord + time_offsets.xy )-0.5;
  44    vec4 dudvb = texture( uTexDudv, world_coord *7.0 - time_offsets.zw )-0.5;
  45
  46    vec3 surfnorm = dudva.rgb + dudvb.rgb;
  47    surfnorm = normalize(vec3(0.0,1.0,0.0) + dudva.xyz*0.4 + dudvb.xyz*0.1);
  48
  49    // Foam
  50    float fband = fract( aCo.z*0.02+uTime*0.1+depthvalue*10.0 );
  51    fband = step( fband+dudva.a*0.8, 0.3 ) * max((1.0-depthvalue*4.0),0.0);
  52
  53    // Lighting
  54    vec3 halfview = -normalize( aCo-uCamera );
  55
  56    // Fog
  57    float fdist = pow(length( aCo.xz-uCamera.xz ) * 0.00047, 2.6);
  58
  59    // Composite
  60    vec4 vsurface = water_surf( halfview, surfnorm, depthvalue );
  61    vsurface.a -= fdist;
  62    oColour = mix( vsurface, vec4(1.0,1.0,1.0,0.5), fband );
  63 }