OpenGL ES 3.0（九）实现美颜相机功能

最新推荐文章于 2025-06-19 08:00:00 发布

zouzhiheng

最新推荐文章于 2025-06-19 08:00:00 发布

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CC 4.0 BY-SA版权

分类专栏：音视频 OpenGL ES 文章标签： OpenGL Android 美颜

本文链接：https://blog.youkuaiyun.com/u011330638/article/details/82292155

着色器代码

虽然知道磨皮应该用双边滤波算法，但实际上我并不懂具体的代码编写过程，因此着色器代码用的是 GitHub 上找的一个项目：WSLiveDemo ，顶点着色器如下：

#version 300 es

layout(location=0) in vec4 aPosition;
layout(location=1) in vec4 aTexCoord;

uniform mat4 mMatrix;

out vec2 vTexCoord;

void main() {
    vTexCoord = (mMatrix * aTexCoord).xy;
    gl_Position = aPosition;
}

片段着色器如下：

#version 300 es
#extension GL_OES_EGL_image_external_essl3 : require

precision highp float;

in highp vec2 vTexCoord;

uniform samplerExternalOES sTexture;

uniform highp vec2 singleStepOffset;
uniform highp vec4 params;
uniform highp float brightness;

const highp vec3 W = vec3(0.299, 0.587, 0.114);
const highp mat3 saturateMatrix = mat3(
        1.1102, -0.0598, -0.061,
        -0.0774, 1.0826, -0.1186,
        -0.0228, -0.0228, 1.1772);

highp vec2 blurCoordinates[24];

highp float hardLight(highp float color) {
    if (color <= 0.5)
        color = color * color * 2.0;
    else
        color = 1.0 - ((1.0 - color)*(1.0 - color) * 2.0);
    return color;
}

layout(location=0) out vec4 fragColor;

void main() {
    highp vec3 centralColor = texture(sTexture, vTexCoord).rgb;
    blurCoordinates[0] = vTexCoord.xy + singleStepOffset * vec2(0.0, -10.0);
    blurCoordinates[1] = vTexCoord.xy + singleStepOffset * vec2(0.0, 10.0);
    blurCoordinates[2] = vTexCoord.xy + singleStepOffset * vec2(-10.0, 0.0);
    blurCoordinates[3] = vTexCoord.xy + singleStepOffset * vec2(10.0, 0.0);
    blurCoordinates[4] = vTexCoord.xy + singleStepOffset * vec2(5.0, -8.0);
    blurCoordinates[5] = vTexCoord.xy + singleStepOffset * vec2(5.0, 8.0);
    blurCoordinates[6] = vTexCoord.xy + singleStepOffset * vec2(-5.0, 8.0);
    blurCoordinates[7] = vTexCoord.xy + singleStepOffset * vec2(-5.0, -8.0);
    blurCoordinates[8] = vTexCoord.xy + singleStepOffset * vec2(8.0, -5.0);
    blurCoordinates[9] = vTexCoord.xy + singleStepOffset * vec2(8.0, 5.0);
    blurCoordinates[10] = vTexCoord.xy + singleStepOffset * vec2(-8.0, 5.0);
    blurCoordinates[