Initial project import

node_modules/three-stdlib/shaders/WaterRefractionShader.cjs

@@ -0,0 +1,88 @@
+"use strict";
+Object.defineProperty(exports, Symbol.toStringTag, { value: "Module" });
+const WaterRefractionShader = {
+  uniforms: {
+    color: {
+      value: null
+    },
+    time: {
+      value: 0
+    },
+    tDiffuse: {
+      value: null
+    },
+    tDudv: {
+      value: null
+    },
+    textureMatrix: {
+      value: null
+    }
+  },
+  vertexShader: (
+    /* glsl */
+    `
+    uniform mat4 textureMatrix;
+
+    varying vec2 vUv;
+    varying vec4 vUvRefraction;
+
+    void main() {
+
+    	vUv = uv;
+
+    	vUvRefraction = textureMatrix * vec4( position, 1.0 );
+
+    	gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );
+
+    }
+  `
+  ),
+  fragmentShader: (
+    /* glsl */
+    `
+    uniform vec3 color;
+    uniform float time;
+    uniform sampler2D tDiffuse;
+    uniform sampler2D tDudv;
+
+    varying vec2 vUv;
+    varying vec4 vUvRefraction;
+
+    float blendOverlay( float base, float blend ) {
+
+    	return( base < 0.5 ? ( 2.0 * base * blend ) : ( 1.0 - 2.0 * ( 1.0 - base ) * ( 1.0 - blend ) ) );
+
+    }
+
+    vec3 blendOverlay( vec3 base, vec3 blend ) {
+
+    	return vec3( blendOverlay( base.r, blend.r ), blendOverlay( base.g, blend.g ),blendOverlay( base.b, blend.b ) );
+
+    }
+
+    void main() {
+
+     float waveStrength = 0.1;
+     float waveSpeed = 0.03;
+
+    // simple distortion (ripple) via dudv map (see https://www.youtube.com/watch?v=6B7IF6GOu7s)
+
+    	vec2 distortedUv = texture2D( tDudv, vec2( vUv.x + time * waveSpeed, vUv.y ) ).rg * waveStrength;
+    	distortedUv = vUv.xy + vec2( distortedUv.x, distortedUv.y + time * waveSpeed );
+    	vec2 distortion = ( texture2D( tDudv, distortedUv ).rg * 2.0 - 1.0 ) * waveStrength;
+
+    // new uv coords
+
+     vec4 uv = vec4( vUvRefraction );
+     uv.xy += distortion;
+
+    	vec4 base = texture2DProj( tDiffuse, uv );
+
+    	gl_FragColor = vec4( blendOverlay( base.rgb, color ), 1.0 );
+
+    }
+  `
+  )
+};
+exports.WaterRefractionShader = WaterRefractionShader;
+//# sourceMappingURL=WaterRefractionShader.cjs.map