Initial project import

node_modules/three-stdlib/shaders/FreiChenShader.cjs

@@ -0,0 +1,86 @@
+"use strict";
+Object.defineProperty(exports, Symbol.toStringTag, { value: "Module" });
+const THREE = require("three");
+const FreiChenShader = {
+  uniforms: {
+    tDiffuse: { value: null },
+    aspect: { value: /* @__PURE__ */ new THREE.Vector2(512, 512) }
+  },
+  vertexShader: (
+    /* glsl */
+    `
+    varying vec2 vUv;
+
+    void main() {
+
+    	vUv = uv;
+    	gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );
+
+    }
+  `
+  ),
+  fragmentShader: (
+    /* glsl */
+    `
+    uniform sampler2D tDiffuse;
+    varying vec2 vUv;
+
+    uniform vec2 aspect;
+
+    vec2 texel = vec2(1.0 / aspect.x, 1.0 / aspect.y);
+
+    mat3 G[9];
+
+    // hard coded matrix values!!!! as suggested in https://github.com/neilmendoza/ofxPostProcessing/blob/master/src/EdgePass.cpp#L45
+
+    const mat3 g0 = mat3( 0.3535533845424652, 0, -0.3535533845424652, 0.5, 0, -0.5, 0.3535533845424652, 0, -0.3535533845424652 );
+    const mat3 g1 = mat3( 0.3535533845424652, 0.5, 0.3535533845424652, 0, 0, 0, -0.3535533845424652, -0.5, -0.3535533845424652 );
+    const mat3 g2 = mat3( 0, 0.3535533845424652, -0.5, -0.3535533845424652, 0, 0.3535533845424652, 0.5, -0.3535533845424652, 0 );
+    const mat3 g3 = mat3( 0.5, -0.3535533845424652, 0, -0.3535533845424652, 0, 0.3535533845424652, 0, 0.3535533845424652, -0.5 );
+    const mat3 g4 = mat3( 0, -0.5, 0, 0.5, 0, 0.5, 0, -0.5, 0 );
+    const mat3 g5 = mat3( -0.5, 0, 0.5, 0, 0, 0, 0.5, 0, -0.5 );
+    const mat3 g6 = mat3( 0.1666666716337204, -0.3333333432674408, 0.1666666716337204, -0.3333333432674408, 0.6666666865348816, -0.3333333432674408, 0.1666666716337204, -0.3333333432674408, 0.1666666716337204 );
+    const mat3 g7 = mat3( -0.3333333432674408, 0.1666666716337204, -0.3333333432674408, 0.1666666716337204, 0.6666666865348816, 0.1666666716337204, -0.3333333432674408, 0.1666666716337204, -0.3333333432674408 );
+    const mat3 g8 = mat3( 0.3333333432674408, 0.3333333432674408, 0.3333333432674408, 0.3333333432674408, 0.3333333432674408, 0.3333333432674408, 0.3333333432674408, 0.3333333432674408, 0.3333333432674408 );
+
+    void main(void)
+    {
+
+    	G[0] = g0,
+    	G[1] = g1,
+    	G[2] = g2,
+    	G[3] = g3,
+    	G[4] = g4,
+    	G[5] = g5,
+    	G[6] = g6,
+    	G[7] = g7,
+    	G[8] = g8;
+
+    	mat3 I;
+    	float cnv[9];
+    	vec3 sample;
+
+    /* fetch the 3x3 neighbourhood and use the RGB vectors length as intensity value */
+    	for (float i=0.0; i<3.0; i++) {
+    		for (float j=0.0; j<3.0; j++) {
+    			sample = texture2D(tDiffuse, vUv + texel * vec2(i-1.0,j-1.0) ).rgb;
+    			I[int(i)][int(j)] = length(sample);
+    		}
+    	}
+
+    /* calculate the convolution values for all the masks */
+    	for (int i=0; i<9; i++) {
+    		float dp3 = dot(G[i][0], I[0]) + dot(G[i][1], I[1]) + dot(G[i][2], I[2]);
+    		cnv[i] = dp3 * dp3;
+    	}
+
+    	float M = (cnv[0] + cnv[1]) + (cnv[2] + cnv[3]);
+    	float S = (cnv[4] + cnv[5]) + (cnv[6] + cnv[7]) + (cnv[8] + M);
+
+    	gl_FragColor = vec4(vec3(sqrt(M/S)), 1.0);
+    }
+  `
+  )
+};
+exports.FreiChenShader = FreiChenShader;
+//# sourceMappingURL=FreiChenShader.cjs.map