Initial project import

node_modules/three-stdlib/shaders/SobelOperatorShader.cjs

@@ -0,0 +1,82 @@
+"use strict";
+Object.defineProperty(exports, Symbol.toStringTag, { value: "Module" });
+const THREE = require("three");
+const SobelOperatorShader = {
+  uniforms: {
+    tDiffuse: { value: null },
+    resolution: { value: /* @__PURE__ */ new THREE.Vector2() }
+  },
+  vertexShader: (
+    /* glsl */
+    `
+    varying vec2 vUv;
+
+    void main() {
+
+    	vUv = uv;
+
+    	gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );
+
+    }
+  `
+  ),
+  fragmentShader: (
+    /* glsl */
+    `
+    uniform sampler2D tDiffuse;
+    uniform vec2 resolution;
+    varying vec2 vUv;
+
+    void main() {
+
+    	vec2 texel = vec2( 1.0 / resolution.x, 1.0 / resolution.y );
+
+    // kernel definition (in glsl matrices are filled in column-major order)
+
+    	const mat3 Gx = mat3( -1, -2, -1, 0, 0, 0, 1, 2, 1 ); // x direction kernel
+    	const mat3 Gy = mat3( -1, 0, 1, -2, 0, 2, -1, 0, 1 ); // y direction kernel
+
+    // fetch the 3x3 neighbourhood of a fragment
+
+    // first column
+
+    	float tx0y0 = texture2D( tDiffuse, vUv + texel * vec2( -1, -1 ) ).r;
+    	float tx0y1 = texture2D( tDiffuse, vUv + texel * vec2( -1,  0 ) ).r;
+    	float tx0y2 = texture2D( tDiffuse, vUv + texel * vec2( -1,  1 ) ).r;
+
+    // second column
+
+    	float tx1y0 = texture2D( tDiffuse, vUv + texel * vec2(  0, -1 ) ).r;
+    	float tx1y1 = texture2D( tDiffuse, vUv + texel * vec2(  0,  0 ) ).r;
+    	float tx1y2 = texture2D( tDiffuse, vUv + texel * vec2(  0,  1 ) ).r;
+
+    // third column
+
+    	float tx2y0 = texture2D( tDiffuse, vUv + texel * vec2(  1, -1 ) ).r;
+    	float tx2y1 = texture2D( tDiffuse, vUv + texel * vec2(  1,  0 ) ).r;
+    	float tx2y2 = texture2D( tDiffuse, vUv + texel * vec2(  1,  1 ) ).r;
+
+    // gradient value in x direction
+
+    	float valueGx = Gx[0][0] * tx0y0 + Gx[1][0] * tx1y0 + Gx[2][0] * tx2y0 + 
+    		Gx[0][1] * tx0y1 + Gx[1][1] * tx1y1 + Gx[2][1] * tx2y1 + 
+    		Gx[0][2] * tx0y2 + Gx[1][2] * tx1y2 + Gx[2][2] * tx2y2; 
+
+    // gradient value in y direction
+
+    	float valueGy = Gy[0][0] * tx0y0 + Gy[1][0] * tx1y0 + Gy[2][0] * tx2y0 + 
+    		Gy[0][1] * tx0y1 + Gy[1][1] * tx1y1 + Gy[2][1] * tx2y1 + 
+    		Gy[0][2] * tx0y2 + Gy[1][2] * tx1y2 + Gy[2][2] * tx2y2; 
+
+    // magnitute of the total gradient
+
+    	float G = sqrt( ( valueGx * valueGx ) + ( valueGy * valueGy ) );
+
+    	gl_FragColor = vec4( vec3( G ), 1 );
+
+    }
+  `
+  )
+};
+exports.SobelOperatorShader = SobelOperatorShader;
+//# sourceMappingURL=SobelOperatorShader.cjs.map