shaders/water.fs

   1 #include "water_ref.glsl"
   2
   3 out vec4 FragColor;
   4
   5 uniform sampler2D uTexMain;
   6 uniform sampler2D uTexDudv;
   7 uniform sampler2D uTexDepth;
   8 uniform sampler2D uTexBack;
   9
  10 uniform vec2 uInvRes;
  11 uniform float uTime;
  12
  13 uniform vec3 uCamera;
  14 uniform float uSurfaceY;
  15
  16 in vec4 aUv;
  17 in vec3 aCo;
  18 in float aDepth;
  19
  20 void main()
  21 {
  22    // Create texture coords
  23    vec2 ssuv = gl_FragCoord.xy*uInvRes;
  24
  25    // Surface colour composite
  26    float depthvalue = texture( uTexDepth, aUv.zw ).r;
  27
  28    vec4 dudva = texture(uTexDudv, aUv.xy + vec2(uTime*0.008,uTime*0.006))-0.5;
  29    vec4 dudvb = texture(uTexDudv, aUv.xy*7.0-vec2(uTime*0.003,uTime*0.03))-0.5;
  30
  31    vec3 surfnorm = dudva.rgb + dudvb.rgb;
  32    surfnorm = normalize(vec3(0.0,1.0,0.0) + dudva.xyz*0.4 + dudvb.xyz*0.1);
  33
  34    // Foam
  35    float fband = fract( aCo.z*0.02+uTime*0.1+depthvalue*10.0 );
  36    fband = step( fband+dudva.a*0.8, 0.3 ) * max((1.0-depthvalue*4.0),0.0);
  37
  38    // Lighting
  39    vec3 halfview = -normalize( aCo-uCamera );
  40
  41    // Sample textures
  42    vec4 above = texture( uTexMain, ssuv+ surfnorm.xz*0.2 );
  43    vec4 beneath = texture( uTexBack, ssuv );
  44
  45    // Fog
  46    //vec4 horizon = vec4( 0.5, 0.6, 0.9, 1.0 );
  47    vec4 horizon = vec4( 0.7,0.8,0.88, 1.0 );
  48    float fdist = pow(length( aCo.xz-uCamera.xz ) * 0.00047, 2.6);
  49
  50    // Composite
  51    vec4 vsurface = water_surf( halfview, surfnorm, depthvalue, beneath, above );
  52    vsurface.a -= fdist;
  53    FragColor = mix( vsurface, vec4(1.0,1.0,1.0,0.5), fband );
  54 }