Three.js实战项目 图片处理系统

@[TOC](Three.js实战项目 图片处理系统)

概述

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写一个Three.js 图片处理系统，图片全使用shader处理，先看视频效果

[video(video-M7InnKUh-1618838856219)(type-csdn)(url-live.csdn.net/v/embed/159…)]

灰度图

// 灰度shader
export const grayscaleShader = {
  vs: `
            varying vec2 v_uv;
            void main() {
                v_uv = uv;
                gl_Position = vec4( position, 1.0 );
            }
        `,
  fs: `
            varying vec2 v_uv;
            uniform sampler2D tex;
            void main() {
              vec4 t_color = texture2D(tex, v_uv);
              float luminance = 0.2 * t_color.r + 0.2 * t_color.g + 0.2 * t_color.b;
              gl_FragColor = vec4(luminance, luminance, luminance, 1);
            }
        `,
  uniforms: {
    tex: {
      value: null
    }
  }
}

更改rgba

// 自由调色shader
export const freeShader = {
  vs: `
            varying vec2 v_uv;
            void main() {
                v_uv = uv;
                gl_Position = vec4( position, 1.0 );
            }
        `,
  fs: `
            varying vec2 v_uv;
            uniform sampler2D tex;
            uniform float r;
            uniform float g;
            uniform float b;
            uniform float a;
            void main() {
              vec4 t_color = texture2D(tex, v_uv);
              gl_FragColor = vec4(t_color.r * r, t_color.g * g, t_color.b * b, t_color.a * a);
            }
        `,
  uniforms: {
    tex: {
      value: null
    },
    r: {
      value: 1.0
    },
    g: {
      value: 1.0
    },
    b: {
      value: 1.0
    },
    a: {
      value: 1.0
    }
  }
}

单色效果

// 单色处理
export const monochromeShader = {
  vs: `
            varying vec2 v_uv;
            void main() {
                v_uv = uv;
                gl_Position = vec4( position, 1.0 );
            }
        `,
  fs: `
            #define R_LUMINANCE 0.298912
            #define G_LUMINANCE 0.586611
            #define B_LUMINANCE 0.114478
            varying vec2 v_uv;
            uniform sampler2D tex;
            const vec3 monochromeScale = vec3(R_LUMINANCE, G_LUMINANCE, B_LUMINANCE);
            void main() {
                vec4 color = texture2D(tex, v_uv);
                float grayColor = dot(color.rgb, monochromeScale);
                gl_FragColor = vec4(vec3(grayColor), 1.0);
            }
        `,
  uniforms: {
    tex: {
      value: null
    }
  }
}

反转效果

// 反转处理
export const reversalShader = {
  vs: `
            varying vec2 v_uv;
            void main() {
                v_uv = uv;
                gl_Position = vec4( position, 1.0 );
            }
        `,
  fs: `
            varying vec2 v_uv;
            uniform sampler2D tex;
            void main() {
                vec4 color = texture2D(tex, v_uv);
                gl_FragColor = vec4(1.0 - color.x, 1.0 - color.y, 1.0 - color.z, 1.0);
            }
        `,
  uniforms: {
    tex: {
      value: null
    }
  }
}