waterShader property

Implementation

static Map<String,dynamic> waterShader = {
  'uniforms': {
    'color': {
      'type': 'c',
      'value': null
    },
    'reflectivity': {
      'type': 'f',
      'value': 0
    },
    'tReflectionMap': {
      'type': 't',
      'value': null
    },
    'tRefractionMap': {
      'type': 't',
      'value': null
    },
    'tNormalMap0': {
      'type': 't',
      'value': null
    },
    'tNormalMap1': {
      'type': 't',
      'value': null
    },
    'textureMatrix': {
      'type': 'm4',
      'value': null
    },
    'config': {
      'type': 'v4',
      'value': Vector4.identity()
    }
  },

  'vertexShader': '''
    #include <common>
    #include <fog_pars_vertex>
    #include <logdepthbuf_pars_vertex>

    uniform mat4 textureMatrix;

    varying vec4 vCoord;
    varying vec2 vUv;
    varying vec3 vToEye;

    void main() {

      vUv = uv;
      vCoord = textureMatrix * vec4( position, 1.0 );

      vec4 worldPosition = modelMatrix * vec4( position, 1.0 );
      vToEye = cameraPosition - worldPosition.xyz;

      vec4 mvPosition =  viewMatrix * worldPosition; // used in fog_vertex
      gl_Position = projectionMatrix * mvPosition;

      #include <logdepthbuf_vertex>
      #include <fog_vertex>

    }''',

  'fragmentShader':'''
    #include <common>
    #include <fog_pars_fragment>
    #include <logdepthbuf_pars_fragment>

    uniform sampler2D tReflectionMap;
    uniform sampler2D tRefractionMap;
    uniform sampler2D tNormalMap0;
    uniform sampler2D tNormalMap1;

    #ifdef USE_FLOWMAP
      uniform sampler2D tFlowMap;
    #else
      uniform vec2 flowDirection;
    #endif

    uniform vec3 color;
    uniform float reflectivity;
    uniform vec4 config;

    varying vec4 vCoord;
    varying vec2 vUv;
    varying vec3 vToEye;

    void main() {

      #include <logdepthbuf_fragment>

      float flowMapOffset0 = config.x;
      float flowMapOffset1 = config.y;
      float halfCycle = config.z;
      float scale = config.w;

      vec3 toEye = normalize( vToEye );

      // determine flow direction
      vec2 flow;
      #ifdef USE_FLOWMAP
        flow = texture2D( tFlowMap, vUv ).rg * 2.0 - 1.0;
      #else
        flow = flowDirection;
      #endif
      flow.x *= - 1.0;

      // sample normal maps (distort uvs with flowdata)
      vec4 normalColor0 = texture2D( tNormalMap0, ( vUv * scale ) + flow * flowMapOffset0 );
      vec4 normalColor1 = texture2D( tNormalMap1, ( vUv * scale ) + flow * flowMapOffset1 );

      // linear interpolate to get the final normal color
      float flowLerp = abs( halfCycle - flowMapOffset0 ) / halfCycle;
      vec4 normalColor = mix( normalColor0, normalColor1, flowLerp );

      // calculate normal vector
      vec3 normal = normalize( vec3( normalColor.r * 2.0 - 1.0, normalColor.b,  normalColor.g * 2.0 - 1.0 ) );

      // calculate the fresnel term to blend reflection and refraction maps
      float theta = max( dot( toEye, normal ), 0.0 );
      float reflectance = reflectivity + ( 1.0 - reflectivity ) * pow( ( 1.0 - theta ), 5.0 );

      // calculate final uv coords
      vec3 coord = vCoord.xyz / vCoord.w;
      vec2 uv = coord.xy + coord.z * normal.xz * 0.05;

      vec4 reflectColor = texture2D( tReflectionMap, vec2( 1.0 - uv.x, uv.y ) );
      vec4 refractColor = texture2D( tRefractionMap, uv );

      // multiply water color with the mix of both textures
      gl_FragColor = vec4( color, 1.0 ) * mix( refractColor, reflectColor, reflectance );

      #include <tonemapping_fragment>
      #include <colorspace_fragment>
      #include <fog_fragment>

    }'''
};