代码如下
YUV420P_Render.h
#ifndef YUV420P_RENDER_H
#define YUV420P_RENDER_H #include <QObject>
#include <QOpenGLWidget>
#include <QOpenGLFunctions>
#include <QOpenGLShaderProgram>
class YUV420P_Render: protected QOpenGLFunctions
{ public:
YUV420P_Render();
~YUV420P_Render(); //初始化gl
void initialize();
//刷新显示
void render(uchar* py,uchar* pu,uchar* pv,int width,int height,int type);
void render(uchar* ptr,int width,int height,int type); private:
//shader程序
QOpenGLShaderProgram m_program;
//shader中yuv变量地址
GLuint m_textureUniformY, m_textureUniformU , m_textureUniformV;
//创建纹理
GLuint m_idy , m_idu , m_idv; }; #endif // YUV420P_RENDER_H
YUV420P_Render.cpp
#include "YUV420P_Render.h"
#include <QDebug>
#include <QTimer> #define ATTRIB_VERTEX 0
#define ATTRIB_TEXTURE 1 YUV420P_Render::YUV420P_Render()
{
} YUV420P_Render::~YUV420P_Render()
{
} //初始化gl
void YUV420P_Render::initialize()
{
qDebug() << "initializeGL"; //初始化opengl （QOpenGLFunctions继承）函数
initializeOpenGLFunctions(); //顶点shader
const char *vString =
"attribute vec4 vertexPosition;\
attribute vec2 textureCoordinate;\
varying vec2 texture_Out;\
void main(void)\
{\
gl_Position = vertexPosition;\
texture_Out = textureCoordinate;\
}";
//片元shader
const char *tString =
"varying vec2 texture_Out;\
uniform sampler2D tex_y;\
uniform sampler2D tex_u;\
uniform sampler2D tex_v;\
void main(void)\
{\
vec3 YUV;\
vec3 RGB;\
YUV.x = texture2D(tex_y, texture_Out).r;\
YUV.y = texture2D(tex_u, texture_Out).r - 0.5;\
YUV.z = texture2D(tex_v, texture_Out).r - 0.5;\
RGB = mat3(1.0, 1.0, 1.0,\
0.0, -0.39465, 2.03211,\
1.13983, -0.58060, 0.0) * YUV;\
gl_FragColor = vec4(RGB, 1.0);\
}"; //m_program加载shader（顶点和片元）脚本
//片元（像素）
qDebug()<<m_program.addShaderFromSourceCode(QOpenGLShader::Fragment, tString);
//顶点shader
qDebug() << m_program.addShaderFromSourceCode(QOpenGLShader::Vertex, vString); //设置顶点位置
m_program.bindAttributeLocation("vertexPosition",ATTRIB_VERTEX);
//设置纹理位置
m_program.bindAttributeLocation("textureCoordinate",ATTRIB_TEXTURE); //编译shader
qDebug() << "m_program.link() = " << m_program.link(); qDebug() << "m_program.bind() = " << m_program.bind(); //传递顶点和纹理坐标
//顶点
static const GLfloat ver[] = {
-1.0f,-1.0f,
1.0f,-1.0f,
-1.0f, 1.0f,
1.0f,1.0f
// -1.0f,-1.0f,
// 0.9f,-1.0f,
// -1.0f, 1.0f,
// 0.9f,1.0f
};
//纹理
static const GLfloat tex[] = {
0.0f, 1.0f,
1.0f, 1.0f,
0.0f, 0.0f,
1.0f, 0.0f
}; //设置顶点,纹理数组并启用
glVertexAttribPointer(ATTRIB_VERTEX, , GL_FLOAT, , , ver);
glEnableVertexAttribArray(ATTRIB_VERTEX);
glVertexAttribPointer(ATTRIB_TEXTURE, , GL_FLOAT, , , tex);
glEnableVertexAttribArray(ATTRIB_TEXTURE); //从shader获取地址
m_textureUniformY = m_program.uniformLocation("tex_y");
m_textureUniformU = m_program.uniformLocation("tex_u");
m_textureUniformV = m_program.uniformLocation("tex_v"); //创建纹理
glGenTextures(, &m_idy);
//Y
glBindTexture(GL_TEXTURE_2D, m_idy);
//放大过滤，线性插值 GL_NEAREST(效率高，但马赛克严重)
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); //U
glGenTextures(, &m_idu);
glBindTexture(GL_TEXTURE_2D, m_idu);
//放大过滤，线性插值
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); //V
glGenTextures(, &m_idv);
glBindTexture(GL_TEXTURE_2D, m_idv);
//放大过滤，线性插值
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
glClear(GL_COLOR_BUFFER_BIT); } //刷新显示
void YUV420P_Render::render(uchar* py,uchar* pu,uchar* pv,int width,int height,int type)
{
glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
glClear(GL_COLOR_BUFFER_BIT); glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, m_idy);
//修改纹理内容(复制内存内容)
glTexImage2D(GL_TEXTURE_2D, , GL_RED, width, height, , GL_RED, GL_UNSIGNED_BYTE,py);
//与shader 关联
glUniform1i(m_textureUniformY, ); glActiveTexture(GL_TEXTURE0+);
glBindTexture(GL_TEXTURE_2D, m_idu);
//修改纹理内容(复制内存内容)
glTexImage2D(GL_TEXTURE_2D, , GL_RED, width/, height/, , GL_RED, GL_UNSIGNED_BYTE, pu);
//与shader 关联
glUniform1i(m_textureUniformU,); glActiveTexture(GL_TEXTURE0+);
glBindTexture(GL_TEXTURE_2D, m_idv);
//修改纹理内容(复制内存内容)
glTexImage2D(GL_TEXTURE_2D, , GL_RED, width/, height/, , GL_RED, GL_UNSIGNED_BYTE, pv);
//与shader 关联
glUniform1i(m_textureUniformV, ); glDrawArrays(GL_TRIANGLE_STRIP,,);
qDebug() << "paintGL";
} void YUV420P_Render::render(uchar* ptr,int width,int height,int type)
{
glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT); glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, m_idy);
//修改纹理内容(复制内存内容)
glTexImage2D(GL_TEXTURE_2D, , GL_RED, width, height, , GL_RED, GL_UNSIGNED_BYTE,ptr);
//与shader 关联
glUniform1i(m_textureUniformY, ); glActiveTexture(GL_TEXTURE0+);
glBindTexture(GL_TEXTURE_2D, m_idu);
//修改纹理内容(复制内存内容)
glTexImage2D(GL_TEXTURE_2D, , GL_RED, width/, height/, , GL_RED, GL_UNSIGNED_BYTE, ptr+width*height);
//与shader 关联
glUniform1i(m_textureUniformU,); glActiveTexture(GL_TEXTURE0+);
glBindTexture(GL_TEXTURE_2D, m_idv);
//修改纹理内容(复制内存内容)
glTexImage2D(GL_TEXTURE_2D, , GL_RED, width/, height/, , GL_RED, GL_UNSIGNED_BYTE, ptr+width*height*/);
//与shader 关联
glUniform1i(m_textureUniformV, ); glDrawArrays(GL_TRIANGLE_STRIP,,);
qDebug() << "paintGL";
}
最后写一个窗口类继承 QOpenGLWidget
重写两个函数
void initializeGL(); //调用上面渲染类的初始化函数
void paintGL();//调用上面渲染类的渲染函数