Initial project import

node_modules/three-stdlib/shaders/ConvolutionShader.cjs

@@ -0,0 +1,75 @@
+"use strict";
+Object.defineProperty(exports, Symbol.toStringTag, { value: "Module" });
+const THREE = require("three");
+const ConvolutionShader = {
+  defines: {
+    KERNEL_SIZE_FLOAT: "25.0",
+    KERNEL_SIZE_INT: "25"
+  },
+  uniforms: {
+    tDiffuse: { value: null },
+    uImageIncrement: { value: /* @__PURE__ */ new THREE.Vector2(1953125e-9, 0) },
+    cKernel: { value: [] }
+  },
+  vertexShader: (
+    /* glsl */
+    `
+    uniform vec2 uImageIncrement;
+
+    varying vec2 vUv;
+
+    void main() {
+
+    	vUv = uv - ( ( KERNEL_SIZE_FLOAT - 1.0 ) / 2.0 ) * uImageIncrement;
+    	gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );
+
+    }
+  `
+  ),
+  fragmentShader: (
+    /* glsl */
+    `
+    uniform float cKernel[ KERNEL_SIZE_INT ];
+
+    uniform sampler2D tDiffuse;
+    uniform vec2 uImageIncrement;
+
+    varying vec2 vUv;
+
+    void main() {
+
+    	vec2 imageCoord = vUv;
+    	vec4 sum = vec4( 0.0, 0.0, 0.0, 0.0 );
+
+    	for( int i = 0; i < KERNEL_SIZE_INT; i ++ ) {
+
+    		sum += texture2D( tDiffuse, imageCoord ) * cKernel[ i ];
+    		imageCoord += uImageIncrement;
+
+    	}
+
+    	gl_FragColor = sum;
+
+    }
+  `
+  ),
+  buildKernel: function(sigma) {
+    function gauss(x, sigma2) {
+      return Math.exp(-(x * x) / (2 * sigma2 * sigma2));
+    }
+    const kMaxKernelSize = 25;
+    const kernelSize = Math.min(2 * Math.ceil(sigma * 3) + 1, kMaxKernelSize);
+    const halfWidth = (kernelSize - 1) * 0.5;
+    const values = new Array(kernelSize);
+    let sum = 0;
+    for (let i = 0; i < kernelSize; ++i) {
+      values[i] = gauss(i - halfWidth, sigma);
+      sum += values[i];
+    }
+    for (let i = 0; i < kernelSize; ++i)
+      values[i] /= sum;
+    return values;
+  }
+};
+exports.ConvolutionShader = ConvolutionShader;
+//# sourceMappingURL=ConvolutionShader.cjs.map