最新代码

public/sdk/three/jsm/shaders/TriangleBlurShader.js

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+import {
+	Vector2
+} from 'three';
+
+/**
+ * Triangle blur shader
+ * based on glfx.js triangle blur shader
+ * https://github.com/evanw/glfx.js
+ *
+ * A basic blur filter, which convolves the image with a
+ * pyramid filter. The pyramid filter is separable and is applied as two
+ * perpendicular triangle filters.
+ */
+
+const TriangleBlurShader = {
+
+	name: 'TriangleBlurShader',
+
+	uniforms: {
+
+		'texture': { value: null },
+		'delta': { value: new Vector2( 1, 1 ) }
+
+	},
+
+	vertexShader: /* glsl */`
+
+		varying vec2 vUv;
+
+		void main() {
+
+			vUv = uv;
+			gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );
+
+		}`,
+
+	fragmentShader: /* glsl */`
+
+		#include <common>
+
+		#define ITERATIONS 10.0
+
+		uniform sampler2D texture;
+		uniform vec2 delta;
+
+		varying vec2 vUv;
+
+		void main() {
+
+			vec4 color = vec4( 0.0 );
+
+			float total = 0.0;
+
+		// randomize the lookup values to hide the fixed number of samples
+
+			float offset = rand( vUv );
+
+			for ( float t = -ITERATIONS; t <= ITERATIONS; t ++ ) {
+
+				float percent = ( t + offset - 0.5 ) / ITERATIONS;
+				float weight = 1.0 - abs( percent );
+
+				color += texture2D( texture, vUv + delta * percent ) * weight;
+				total += weight;
+
+			}
+
+			gl_FragColor = color / total;
+
+		}`
+
+};
+
+export { TriangleBlurShader };