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    float y1 = dot(color1.rgb, COEF_Y);
    float y2 = dot(color2.rgb, COEF_Y);
    float y3 = dot(color3.rgb, COEF_Y);
    outColor = vec4(y0, y1, y2, y3);
}
else{
    //不清楚为什么减UV_DIVIDE_LINE再乘以3
    vec2 texCoord = vec2(v_texCoord.x, (v_texCoord.y - UV_DIVIDE_LINE) * 3.0);
    vec4 color0 = texture(s_TextureMap, texCoord);
    vec4 color1 = texture(s_TextureMap, texCoord + texelOffset);
    vec4 color2 = texture(s_TextureMap, texCoord + texelOffset * 2.0);
    vec4 color3 = texture(s_TextureMap, texCoord + texelOffset * 3.0);
    float v0 = dot(color0.rgb, COEF_V) + 0.5;
    float u0 = dot(color1.rgb, COEF_U) + 0.5;
    float v1 = dot(color2.rgb, COEF_V) + 0.5;
    float u1 = dot(color3.rgb, COEF_U) + 0.5;
    outColor = vec4(v0, u0, v1, u1);
}

}

RGB2NV21.cpp

//
// Created by CreatWall_zhouwen on 2023/4/28.
//

#include <stdio.h>
#include “RGB2NV21.h”
#include “Util.h”
#include “GLUtil.h”
#include <malloc.h>
#include <string.h>
#include <unistd.h>
#include “sys/stat.h”
#include “stdint.h”
RGB2NV21* m_pContext = nullptr;
#define TAG “RGB2NV21”
//顶点坐标
GLfloat vVertices[] = {
-1.0f, -1.0f, 0.0f,
1.0f, -1.0f, 0.0f,
-1.0f, 1.0f, 0.0f,
1.0f, 1.0f, 0.0f,
};
//纹理坐标

GLfloat vFboTexCoors[] = {
0.0f, 0.0f,
1.0f, 0.0f,
0.0f, 1.0f,
1.0f, 1.0f,
};
GLushort indices[] = { 0, 1, 2, 1, 3, 2 };//三角形的索引数组

/*
*
-1.0f, -1.0f, 0.0f,
1.0f, -1.0f, 0.0f,
-1.0f, 1.0f, 0.0f,
1.0f, 1.0f, 0.0f,
//纹理坐标
GLfloat vFboTexCoors[] = {