qt pbo渲染方法

//nv12render.cpp
#include "nv12render.h"
#include 
#include 
#include"debug.h"
#include"RKbaseFunc.h"
#include 


#if 1

void Nv12Render::initialize()
{
    initializeOpenGLFunctions();
    glClearColor(0.0f,0.0f,0.0f,1.0f);
    glClear(GL_COLOR_BUFFER_BIT);


    const char *vsrc = " 
            attribute vec4 vertexIn; 
    attribute vec4 textureIn; 
    varying vec4 textureOut;  
    void main(void)           
    {                         
        gl_Position = vertexIn; 
        textureOut = textureIn; 
    }";

    //Hi3536的openGL ES2着色器必须要先设置精度
    const char *fsrc = "
            precision mediump float; 
    varying mediump vec4 textureOut; 
    uniform sampler2D textureY; 
    uniform sampler2D textureUV; 
    void main(void) 
    {
        vec3 yuv; 
        vec3 rgb; 
        yuv.x = texture2D(textureY, textureOut.st).r - 0.0625; 
        yuv.y = texture2D(textureUV, textureOut.st).r - 0.5; 
        yuv.z = texture2D(textureUV, textureOut.st).g - 0.5; 
        rgb = mat3( 1,       1,         1, 
                    0,       -0.39465,  2.03211, 
                    1.13983, -0.58060,  0) * yuv; 
        gl_FragColor = vec4(rgb, 1); 
    }";

    program.addCacheableShaderFromSourceCode(QOpenGLShader::Vertex,vsrc);
    program.addCacheableShaderFromSourceCode(QOpenGLShader::Fragment,fsrc);
    program.link();

    GLfloat points[]{
        -1.0f, 1.0f,
        1.0f, 1.0f,
        1.0f, -1.0f,
        -1.0f, -1.0f,

        0.0f,0.0f,
        1.0f,0.0f,
        1.0f,1.0f,
        0.0f,1.0f
    };

    vbo.create();
    vbo.bind();
    vbo.allocate(points,sizeof(points));

    GLuint ids[2];
    glGenTextures(2,ids);
    idY = ids[0];
    idUV = ids[1];



    // 创建1个缓冲区
//    glGenBuffers(1, &m_Buffer);
//    glBindBuffer(GL_ARRAY_BUFFER, m_Buffer);
//    glBufferData(GL_ARRAY_BUFFER, 1920*1088*3/2, NULL, GL_DYNAMIC_COPY);
//    glBindBuffer(GL_ARRAY_BUFFER, 0);





#if 0
#if 1
    m_pNV12Buffer = new unsigned char[1920*1088*3/2];
#else

#if 0
    void* m_pframeBuffer = CRKbaseFunc::RK_GetMPPBuffer(1920*1088*3/2);
    //m_pNV12Buffer = (unsigned char*)CRKbaseFunc::RK_GetVideoBufferPtr(m_pframeBuffer);
   m_pNV12Buffer = (uint8_t *)mmap(0, 1920*1088*3/2, PROT_READ | PROT_WRITE, MAP_SHARED, CRKbaseFunc::RK_GetVideoBufferFd(m_pframeBuffer), 0);
#else
    m_pDrmMemCtrl = IDRMMemCtrl::Create();
    RKDRM_MEM_INFO memInfo;
    memset(&memInfo, 0, sizeof(RKDRM_MEM_INFO));
    memInfo.nSize = 1920 * 1088 * 2;
    m_pDrmMemCtrl->DRMAlloc(memInfo);
    m_pNV12Buffer = (unsigned char*)memInfo.vitualPtr;
#endif
#endif
#endif



#if 1
    m_pOpenglBuffer[0] = new QOpenGLBuffer(QOpenGLBuffer::PixelUnpackBuffer);
    m_pOpenglBuffer[0]->create();
    m_pOpenglBuffer[0]->bind();
    m_pOpenglBuffer[0]->allocate(1920*1088);
    m_pOpenglBuffer[0]->release();

    m_pOpenglBuffer[1] = new QOpenGLBuffer(QOpenGLBuffer::PixelUnpackBuffer);
    m_pOpenglBuffer[1]->create();
    m_pOpenglBuffer[1]->bind();
    m_pOpenglBuffer[1]->allocate(1920*1088/2);
    m_pOpenglBuffer[1]->release();
#endif


}
#endif


void Nv12Render::render(uchar *nv12Ptr, int w, int h)
{
    if(!nv12Ptr)return;




#if 0
   memcpy(m_pNV12Buffer,nv12Ptr,1920*1088*3/2);
   uchar* pNv12Data = m_pNV12Buffer;
  // memset(pNv12Data,0,1920*1088*3/2);
#else
    uchar* pNv12Data = nv12Ptr;
#endif



    RAIITimer time123("Nv12Render::render");


 //       glClearColor(0.5f, 0.5f, 0.7f, 1.0f);
 //       glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 //       glDisable(GL_DEPTH_TEST);

        program.bind();
        vbo.bind();
        program.enableAttributeArray("vertexIn");
        program.enableAttributeArray("textureIn");
        program.setAttributeBuffer("vertexIn",GL_FLOAT, 0, 2, 2*sizeof(GLfloat));
        program.setAttributeBuffer("textureIn",GL_FLOAT,2 * 4 * sizeof(GLfloat),2,2*sizeof(GLfloat));



        m_pOpenglBuffer[0]->bind();
       void* buffer_data =  m_pOpenglBuffer[0]->map(QOpenGLBuffer::ReadWrite);
       memcpy(buffer_data,nv12Ptr,1920*1088);
       m_pOpenglBuffer[0]->unmap();

        glActiveTexture(GL_TEXTURE0 + 1); //测试发现使用"+ 0"会异常
        glBindTexture(GL_TEXTURE_2D,idY);
        glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);
        glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);


      // glTexImage2D(GL_TEXTURE_2D,0,GL_RED,w,h,0,GL_RED,GL_UNSIGNED_BYTE,pNv12Data);
       glTexImage2D(GL_TEXTURE_2D,0,GL_RED,w,h,0,GL_RED,GL_UNSIGNED_BYTE,NULL);



       m_pOpenglBuffer[1]->bind();
       buffer_data =  m_pOpenglBuffer[1]->map(QOpenGLBuffer::ReadWrite);
       memcpy(buffer_data,nv12Ptr+1920*1088,1920*1088/2);
       m_pOpenglBuffer[1]->unmap();


        glActiveTexture(GL_TEXTURE0 + 0);
        glBindTexture(GL_TEXTURE_2D,idUV);
        glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);
        glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);

    //    glTexImage2D(GL_TEXTURE_2D,0,GL_RG,w >> 1,h >> 1,0,GL_RG,GL_UNSIGNED_BYTE,pNv12Data + w*h);
    glTexImage2D(GL_TEXTURE_2D,0,GL_RG,w >> 1,h >> 1,0,GL_RG,GL_UNSIGNED_BYTE,NULL);



    program.setUniformValue("textureUV",0);
    program.setUniformValue("textureY",1);
    glDrawArrays(GL_TRIANGLE_FAN, 0, 4);

    m_pOpenglBuffer[0]->release();
    m_pOpenglBuffer[1]->release();
    program.disableAttributeArray("vertexIn");
    program.disableAttributeArray("textureIn");
    program.release();







}