shaders/water_fast.fs

   1 uniform sampler2D uTexDudv;
   2
   3 uniform float uTime;
   4 uniform vec3 uCamera;
   5 uniform float uSurfaceY;
   6
   7 uniform vec3 uShoreColour;
   8 uniform vec3 uOceanColour;
   9
  10 in vec4 aColour;
  11 in vec2 aUv;
  12 in vec3 aNorm;
  13 in vec3 aCo;
  14 in vec3 aWorldCo;
  15
  16 #include "common_world.glsl"
  17 #include "motion_vectors_fs.glsl"
  18
  19 vec4 water_surf( vec3 halfview, vec3 vnorm, float depthvalue )
  20 {
  21    vec3 surface_tint = mix(uShoreColour, uOceanColour, depthvalue);
  22
  23    float ffresnel = pow(1.0-dot( vnorm, halfview ),5.0);
  24
  25    vec3 lightdir = vec3(0.95,0.0,-0.3);
  26    vec3 specdir = reflect( -lightdir, vnorm );
  27    float spec = pow(max(dot(halfview,specdir),0.0),20.0)*0.3;
  28
  29    return vec4( surface_tint + spec, max(min(depthvalue*4.0, 1.0),0.0) );
  30 }
  31
  32 void main()
  33 {
  34    compute_motion_vectors();
  35
  36    // Surface colour composite
  37    float depthvalue = clamp( -world_depth_sample( aCo )*(1.0/25.0), 0.0, 1.0 );
  38
  39    vec2 world_coord = aCo.xz * 0.008;
  40    vec4 time_offsets = vec4( uTime ) * vec4( 0.008, 0.006, 0.003, 0.03 );
  41    vec4 dudva = texture( uTexDudv, world_coord + time_offsets.xy )-0.5;
  42    vec4 dudvb = texture( uTexDudv, world_coord *7.0 - time_offsets.zw )-0.5;
  43
  44    vec3 surfnorm = dudva.rgb + dudvb.rgb;
  45    surfnorm = normalize(vec3(0.0,1.0,0.0) + dudva.xyz*0.4 + dudvb.xyz*0.1);
  46
  47    // Foam
  48    float fband = fract( aCo.z*0.02+uTime*0.1+depthvalue*10.0 );
  49    fband = step( fband+dudva.a*0.8, 0.3 ) * max((1.0-depthvalue*4.0),0.0);
  50
  51    // Lighting
  52    vec3 halfview = -normalize( aCo-uCamera );
  53
  54    // Fog
  55    float fdist = pow(length( aCo.xz-uCamera.xz ) * 0.00047, 2.6);
  56
  57    // Composite
  58    vec4 vsurface = water_surf( halfview, surfnorm, depthvalue );
  59    vsurface.a -= fdist;
  60    oColour = mix( vsurface, vec4(1.0,1.0,1.0,0.5), fband );
  61 }