gcc -o triangle glad.c triangle.c -lglfw3 -lGL -lX11 -lm -lpthread -ldl

ffmpeg -i C:\Users\Administrator\Desktop\test.h264 -y -an -frames 1 -s 1920x1080 out.yuv
pause

#include<string>
#include<fstream>
#include<sstream>
#include<iostream>
#include<stdio.h>
#include "glad.h"
#include <GLFW/glfw3.h>typedef unsigned char BYTE;
const unsigned int SCR_WIDTH = 500;
const unsigned int SCR_HEIGHT = 600;
const int len = 1920*1080 * 3/2;
BYTE YUVdata [len];unsigned int VBO = 0;
unsigned int VAO = 0;
unsigned int EBO = 0;
unsigned int texturePIC = 0;
int shaderProgram = 0;GLuint texIndexarray[3];
GLuint texUniformY = 99;
GLuint texUniformU = 99;
GLuint texUniformV = 99;void LoadPicture()
{glGenTextures(3, texIndexarray);//生成三个纹理索引glBindTexture(GL_TEXTURE_2D, texIndexarray[0]);//为bind的纹理设置环绕，过滤方式glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);glBindTexture(GL_TEXTURE_2D, texIndexarray[1]);//为bind的纹理设置环绕，过滤方式glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);glBindTexture(GL_TEXTURE_2D, texIndexarray[2]);//为bind的纹理设置环绕，过滤方式glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);//使用着色器程序，返回采样器的序号glUseProgram(shaderProgram);//该语句必须要有；安装 指定着色器程序texUniformY = glGetUniformLocation(shaderProgram, "dataY");texUniformU = glGetUniformLocation(shaderProgram, "dataU");texUniformV = glGetUniformLocation(shaderProgram, "dataV");----------加载数据--------------------------------------------------------FILE* fp = fopen("./out.yuv","rb+");//I420int returns  =fread(YUVdata,1,len,fp);int w = 1920;int h = 1080;int ysize = w*h;int uvsize = w * h / 4;void* uptr = &YUVdata[ysize];void* vptr = &YUVdata[ysize * 5 / 4];//---------------------------------------------------------------------------glActiveTexture(GL_TEXTURE0);glBindTexture(GL_TEXTURE_2D, texIndexarray[0]);// texindexarray[0] =1//使用GL_red表示单通道，glfw3里边没有YUV那个GL属性；glTexImage2D(GL_TEXTURE_2D, 0 , GL_RED, w, h ,0, GL_RED,GL_UNSIGNED_BYTE ,YUVdata);glUniform1i(texUniformY,0);                //通过 glUniform1i 的设置，保证每个 uniform 采样器对应着正确的纹理单元;注意这里不能用tesindexarray[0];glActiveTexture(GL_TEXTURE1);glBindTexture(GL_TEXTURE_2D, texIndexarray[1]);glTexImage2D(GL_TEXTURE_2D, 0, GL_RED, w/2, h/2, 0, GL_RED, GL_UNSIGNED_BYTE,uptr);glUniform1i(texUniformU, 1);glActiveTexture(GL_TEXTURE2);glBindTexture(GL_TEXTURE_2D, texIndexarray[2]);glTexImage2D(GL_TEXTURE_2D, 0, GL_RED, w/2, h/2, 0, GL_RED, GL_UNSIGNED_BYTE,vptr);glUniform1i(texUniformV,2);glUseProgram(0);
}void render()
{glBindVertexArray(VAO);glUseProgram(shaderProgram);glDrawElements(GL_TRIANGLES,6,GL_UNSIGNED_INT,0);//glDrawArrays(GL_TRIANGLE_FAN,0,4);也可glUseProgram(0);glBindVertexArray(0);
}void initmodule()
{//做个一模型;正方形；映射了顶点坐标和纹理坐标的对应关系float vertexs[] = {//顶点坐标-------纹理坐标(屏幕坐标翻转)1.0f,  1.0f, 0.0f,  1.0f, 0.0f,   1.0f, -1.0f, 0.0f,  1.0f, 1.0f,   -1.0f, -1.0f, 0.0f,  0.0f, 1.0f,   -1.0f,  1.0f, 0.0f,  0.0f, 0.0f    };//一个正方形是由两个三角形得来的；记录顶点的索引顺序unsigned int indexs[] = {0,1,3,1,2,3,};//做VAOglGenVertexArrays(1,&VAO);glBindVertexArray(VAO);//做VBOglGenBuffers(1, &VBO);glBindBuffer(GL_ARRAY_BUFFER, VBO);//创建显存空间glBufferData(GL_ARRAY_BUFFER,sizeof(vertexs), vertexs, GL_STATIC_DRAW);//设置索引缓冲glGenBuffers(1,&EBO);glBindBuffer(GL_ELEMENT_ARRAY_BUFFER,EBO);glBufferData(GL_ELEMENT_ARRAY_BUFFER,sizeof(indexs),indexs,GL_STATIC_DRAW);    //加载纹理图片,生成纹理LoadPicture();//设置第0个锚点,3个点，不需要归一化，跨度5个float可以读下一个点glVertexAttribPointer(0,3,GL_FLOAT,GL_FALSE,5*sizeof(float),(void*)0);//打开顶点glEnableVertexAttribArray(0);//纹理属性设置,纹理在第一个锚点上（指定顶点数据）glVertexAttribPointer(1,2, GL_FLOAT, GL_FALSE, 5 * sizeof(float), (void*)(3 * sizeof(float)));//打开纹理glEnableVertexAttribArray(1);//解除绑定VBOglBindBuffer(GL_ARRAY_BUFFER,0);//解绑VAOglBindVertexArray(0);}void initshader(const char* verpath,const char* fragpath)
{//编译shader，并记录shaderIDstd::string VerCode("");std::string fregCode("");//读文件std::ifstream  vShaderFile;std::ifstream  fShaderFile;vShaderFile.exceptions(std::ifstream::failbit | std::ifstream::badbit);fShaderFile.exceptions(std::ifstream::failbit | std::ifstream::badbit);try{vShaderFile.open(verpath);fShaderFile.open(fragpath);std::stringstream vsstream, fsstream;vsstream << vShaderFile.rdbuf();fsstream << fShaderFile.rdbuf();VerCode = vsstream.str();fregCode = fsstream.str();}catch (const std::exception&){std::cout << "read file error" << std::endl;}const char* vshader = VerCode.c_str();const char* fshader = fregCode.c_str();//shader 编译连接unsigned int vertexID = 0, fragID = 0;char infoLog[512];//存储错误信息int  successflag = 0;vertexID = glCreateShader(GL_VERTEX_SHADER);glShaderSource(vertexID,1,&vshader,NULL );glCompileShader(vertexID);//获取编译是否成功glGetShaderiv(vertexID,GL_COMPILE_STATUS,&successflag);if (!successflag){glGetShaderInfoLog(vertexID,512,NULL,infoLog);std::string errstr(infoLog);std::cout << "v shader err"<<infoLog;}//fragfragID = glCreateShader(GL_FRAGMENT_SHADER);glShaderSource(fragID, 1, &fshader, NULL);glCompileShader(fragID);//获取编译是否成功glGetShaderiv(fragID, GL_COMPILE_STATUS, &successflag);if (!successflag){glGetShaderInfoLog(fragID, 512, NULL, infoLog);std::string errstr(infoLog);std::cout << "f shader err"<<infoLog;}//链接shaderProgram = glCreateProgram();glAttachShader(shaderProgram,vertexID);glAttachShader(shaderProgram,fragID);glBindAttribLocation(shaderProgram, 0, "aPos");glBindAttribLocation(shaderProgram, 1, "texCoord");glLinkProgram(shaderProgram);glGetProgramiv(shaderProgram,GL_LINK_STATUS,&successflag);if (!successflag){glGetShaderInfoLog(shaderProgram, 512, NULL, infoLog);std::string errstr(infoLog);std::cout << "link error";}//编译完成后，可以把中间的步骤程序删除glDeleteShader(vertexID);glDeleteShader(fragID);
}
void processInput(GLFWwindow *window)
{if (glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS){//将窗口设置为关闭，跳出循环glfwSetWindowShouldClose(window, true);}
}void framebuffer_size_callback(GLFWwindow* window, int width, int height)
{glViewport(0, 0, width, height);
}int main()
{//glfw初始化glfwInit();glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);//glfw创建窗口GLFWwindow* window = glfwCreateWindow(500, 600, "LearnOpenGL", NULL, NULL);if (window == NULL){printf("创建窗口失败");//终止glfwTerminate();return -1;}//显示窗口glfwMakeContextCurrent(window);//设置回调，当窗口大小调整后将调用该回调函数glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);// glad初始化if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress)){printf("加载失败");return -1;}initshader("vertexShader.glsl", "fragmentShader.glsl");//先编译着色器initmodule();// 使用循环达到循环渲染效果while (!glfwWindowShouldClose(window)){//自定义输入事件processInput(window);glClearColor(0.0f,0.0f,0.0f,1.0f);glClear(GL_COLOR_BUFFER_BIT);render();//交互缓冲区，否则显示空白glfwSwapBuffers(window);//输入输出事件,否则无法对窗口进行交互glfwPollEvents();}//终止渲染 关闭并清理glfw本地资源glfwTerminate();return 0;
}

#version 330 core
layout(location = 0) in vec3 aPos;
layout(location = 1) in vec2 texCoord; out vec2 TexCoord;
void main()
{gl_Position = vec4(aPos.x,aPos.y,aPos.z,1.0);TexCoord = texCoord;
};

#version 330 core
layout(location = 0) out vec4 FragColor;
in vec2 TexCoord;
uniform sampler2D dataY;
uniform sampler2D dataU;
uniform sampler2D dataV;
vec3 yuv;
vec3 rgb;
void main()
{yuv.x = texture2D(dataY, TexCoord).r-0.0625;yuv.y = texture2D(dataU, TexCoord).r-0.5;yuv.z = texture2D(dataV, TexCoord).r-0.5;rgb = mat3(1,              1,      1,     0,       -0.18732, 1.8556,    1.57481, -0.46813,      0) * yuv;   FragColor = vec4(rgb.x, rgb.y,rgb.z,1); 
};

g++ -o yuv_show glad.c yuv_show.cpp -lglfw3 -lGL -lX11 -lm -lpthread -ldl