{"version":3,"file":"WaterRefractionShader.cjs","sources":["../../src/shaders/WaterRefractionShader.ts"],"sourcesContent":["export const WaterRefractionShader = {\n  uniforms: {\n    color: {\n      value: null,\n    },\n\n    time: {\n      value: 0,\n    },\n\n    tDiffuse: {\n      value: null,\n    },\n\n    tDudv: {\n      value: null,\n    },\n\n    textureMatrix: {\n      value: null,\n    },\n  },\n\n  vertexShader: /* glsl */ `\n    uniform mat4 textureMatrix;\n\n    varying vec2 vUv;\n    varying vec4 vUvRefraction;\n\n    void main() {\n\n    \tvUv = uv;\n\n    \tvUvRefraction = textureMatrix * vec4( position, 1.0 );\n\n    \tgl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );\n\n    }\n  `,\n\n  fragmentShader: /* glsl */ `\n    uniform vec3 color;\n    uniform float time;\n    uniform sampler2D tDiffuse;\n    uniform sampler2D tDudv;\n\n    varying vec2 vUv;\n    varying vec4 vUvRefraction;\n\n    float blendOverlay( float base, float blend ) {\n\n    \treturn( base < 0.5 ? ( 2.0 * base * blend ) : ( 1.0 - 2.0 * ( 1.0 - base ) * ( 1.0 - blend ) ) );\n\n    }\n\n    vec3 blendOverlay( vec3 base, vec3 blend ) {\n\n    \treturn vec3( blendOverlay( base.r, blend.r ), blendOverlay( base.g, blend.g ),blendOverlay( base.b, blend.b ) );\n\n    }\n\n    void main() {\n\n     float waveStrength = 0.1;\n     float waveSpeed = 0.03;\n\n    // simple distortion (ripple) via dudv map (see https://www.youtube.com/watch?v=6B7IF6GOu7s)\n\n    \tvec2 distortedUv = texture2D( tDudv, vec2( vUv.x + time * waveSpeed, vUv.y ) ).rg * waveStrength;\n    \tdistortedUv = vUv.xy + vec2( distortedUv.x, distortedUv.y + time * waveSpeed );\n    \tvec2 distortion = ( texture2D( tDudv, distortedUv ).rg * 2.0 - 1.0 ) * waveStrength;\n\n    // new uv coords\n\n     vec4 uv = vec4( vUvRefraction );\n     uv.xy += distortion;\n\n    \tvec4 base = texture2DProj( tDiffuse, uv );\n\n    \tgl_FragColor = vec4( blendOverlay( base.rgb, color ), 1.0 );\n\n    }\n  `,\n}\n"],"names":[],"mappings":";;AAAO,MAAM,wBAAwB;AAAA,EACnC,UAAU;AAAA,IACR,OAAO;AAAA,MACL,OAAO;AAAA,IACT;AAAA,IAEA,MAAM;AAAA,MACJ,OAAO;AAAA,IACT;AAAA,IAEA,UAAU;AAAA,MACR,OAAO;AAAA,IACT;AAAA,IAEA,OAAO;AAAA,MACL,OAAO;AAAA,IACT;AAAA,IAEA,eAAe;AAAA,MACb,OAAO;AAAA,IACT;AAAA,EACF;AAAA,EAEA;AAAA;AAAA,IAAyB;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA,EAiBzB;AAAA;AAAA,IAA2B;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AA2C7B;;"}