shaders/water.fs

   1 out vec4 FragColor;
   2
   3 uniform sampler2D uTexMain;
   4 uniform sampler2D uTexDudv;
   5 uniform sampler2D uTexBack;
   6
   7 uniform vec2 uInvRes;
   8 uniform float uTime;
   9 uniform vec3 uCamera;
  10 uniform float uSurfaceY;
  11
  12 in vec4 aColour;
  13 in vec2 aUv;
  14 in vec3 aNorm;
  15 in vec3 aCo;
  16
  17 #include "common_world.glsl"
  18
  19 vec4 water_surf( vec3 halfview, vec3 vnorm, float depthvalue,
  20       vec4 beneath, vec4 above )
  21 {
  22    vec3 colour_shore = vec3( 0.21, 0.6, 0.8 );
  23    vec3 colour_ocean = vec3( 0.01, 0.1, 0.2 );
  24    vec3 surface_tint = mix(colour_shore, colour_ocean, depthvalue);
  25
  26    float ffresnel = pow(1.0-dot( vnorm, halfview ),5.0);
  27
  28    vec3 lightdir = vec3(0.95,0.0,-0.3);
  29    vec3 specdir = reflect( -lightdir, vnorm );
  30    float spec = pow(max(dot(halfview,specdir),0.0),20.0)*0.3;
  31
  32    // Depth
  33    float depthblend = pow( beneath.a,0.8 );
  34
  35    // Composite
  36    vec3 vsurface = mix(surface_tint, above.rgb, ffresnel );
  37    //vsurface += spec;
  38
  39    return vec4( vsurface,depthblend );
  40 }
  41
  42 void main()
  43 {
  44    // Create texture coords
  45    vec2 ssuv = gl_FragCoord.xy*uInvRes;
  46
  47    // Surface colour composite
  48    float depthvalue = clamp( -world_depth_sample( aCo )*(1.0/25.0), 0.0, 1.0 );
  49
  50    vec2 world_coord = aCo.xz * 0.008;
  51    vec4 time_offsets = vec4( uTime ) * vec4( 0.008, 0.006, 0.003, 0.03 );
  52    vec4 dudva = texture( uTexDudv, world_coord + time_offsets.xy )-0.5;
  53    vec4 dudvb = texture( uTexDudv, world_coord *7.0 - time_offsets.zw )-0.5;
  54
  55    vec3 surfnorm = dudva.rgb + dudvb.rgb;
  56    surfnorm = normalize(vec3(0.0,1.0,0.0) + dudva.xyz*0.4 + dudvb.xyz*0.1);
  57
  58    // Foam
  59    float fband = fract( aCo.z*0.02+uTime*0.1+depthvalue*10.0 );
  60    fband = step( fband+dudva.a*0.8, 0.3 ) * max((1.0-depthvalue*4.0),0.0);
  61
  62    // Lighting
  63    vec3 halfview = -normalize( aCo-uCamera );
  64
  65    // Sample textures
  66    vec4 above = texture( uTexMain, ssuv+ surfnorm.xz*0.2 );
  67    vec4 beneath = texture( uTexBack, ssuv );
  68
  69    // Fog
  70    float fdist = pow(length( aCo.xz-uCamera.xz ) * 0.00047, 2.6);
  71
  72    // Composite
  73    vec4 vsurface = water_surf( halfview, surfnorm, depthvalue, beneath, above );
  74    vsurface.a -= fdist;
  75    FragColor = mix( vsurface, vec4(1.0,1.0,1.0,0.5), fband );
  76 }