shaders/scene_water.fs

   1 uniform sampler2D uTexMain;
   2 uniform sampler2D uTexDudv;
   3 uniform sampler2D uTexBack;
   4
   5 uniform vec2 uInvRes;
   6 uniform float uTime;
   7 uniform vec3 uCamera;
   8 uniform float uSurfaceY;
   9 uniform vec3 uBoard0;
  10 uniform vec3 uBoard1;
  11
  12 uniform vec3 uShoreColour;
  13 uniform vec3 uOceanColour;
  14
  15 #include "common_scene.glsl"
  16 #include "motion_vectors_fs.glsl"
  17
  18 vec4 water_surf( vec3 halfview, vec3 vnorm, float depthvalue,
  19                  vec4 beneath, vec4 above )
  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    // Depth
  30    float depthblend = pow( beneath.r, 0.8 );
  31
  32    // Composite
  33    vec3 vsurface = mix(surface_tint, above.rgb, ffresnel );
  34    //vsurface += spec;
  35
  36    return vec4( vsurface,depthblend );
  37 }
  38
  39 void main()
  40 {
  41    compute_motion_vectors();
  42
  43    // Create texture coords
  44    vec2 ssuv = gl_FragCoord.xy*uInvRes;
  45
  46    // Surface colour composite
  47    float depthvalue = clamp( -world_water_depth( aCo )*(1.0/25.0), 0.0, 1.0 );
  48
  49    vec2 world_coord = aCo.xz * 0.008;
  50    vec4 time_offsets = vec4( uTime ) * vec4( 0.008, 0.006, 0.003, 0.03 );
  51    vec4 dudva = texture( uTexDudv, world_coord + time_offsets.xy )-0.5;
  52    vec4 dudvb = texture( uTexDudv, world_coord *7.0 - time_offsets.zw )-0.5;
  53
  54    vec3 surfnorm = dudva.rgb + dudvb.rgb;
  55    surfnorm = normalize(vec3(0.0,1.0,0.0) + dudva.xyz*0.4 + dudvb.xyz*0.1);
  56
  57    // Foam
  58    float fband = fract( aCo.z*0.02+uTime*0.1+depthvalue*10.0 );
  59    fband = step( fband+dudva.a*0.8, 0.3 ) * max((1.0-depthvalue*4.0),0.0);
  60
  61    // Lighting
  62    vec3 halfview = -normalize( aCo-uCamera );
  63
  64    // Sample textures
  65    vec4 above = texture( uTexMain, ssuv+ surfnorm.xz*0.2 );
  66    vec4 beneath = texture( uTexBack, ssuv );
  67
  68    // Fog
  69    float fdist = pow(length( aCo.xz-uCamera.xz ) * 0.00047, 2.6);
  70
  71    // Composite
  72    vec4 vsurface = water_surf( halfview, surfnorm, depthvalue, beneath, above );
  73    vsurface.a -= fdist;
  74    oColour = mix( vsurface, vec4(1.0,1.0,1.0,0.5), fband );
  75 }