import { ShaderMaterial, Texture, Vector2 } from "three";
export function createBlurPassMaterial(
texture: Texture,
direction = new Vector2(1.0, 0.0)
) {
return new ShaderMaterial({
uniforms: {
densityTex: { value: texture },
direction: { value: direction }, // (1,0) = horizontal, (0,1) = vertical
texSize: { value: new Vector2(512, 512) },
},
vertexShader: `
varying vec2 vUv;
void main() {
vUv = uv;
gl_Position = vec4(position.xy, 0.0, 1.0);
}
`,
fragmentShader: `
precision highp float;
uniform sampler2D densityTex;
uniform vec2 direction;
uniform vec2 texSize;
varying vec2 vUv;
void main() {
vec2 texel = direction / texSize;
float kernel[5];
kernel[0] = 0.204164;
kernel[1] = 0.304005;
kernel[2] = 0.193783;
kernel[3] = 0.072184;
kernel[4] = 0.025864;
vec4 sum = texture2D(densityTex, vUv) * kernel[0];
for (int i = 1; i < 5; i++) {
sum += texture2D(densityTex, vUv + texel * float(i)) * kernel[i];
sum += texture2D(densityTex, vUv - texel * float(i)) * kernel[i];
}
gl_FragColor = sum;
}
`,
});
}
