许多四边形,尽管VBO不是很多fps

Question

我有一些时间,我读过VBO,这就是我得到的:

http://img64.imageshack.us/img64/5733/fps8.jpg

好吧,它比以前好多了.它是在Release上编译的.我使用VBO(可能,如果everthing的确定)和glDrawArrays绘制.

这是绘图代码.请给我建议如何优化它.我想要地形......呃几千FPS,这是真的吗？

void DrawVBO (void)
{
    int i;

    CVert*      m_pVertices; 
    CTexCoord*  m_pTexCoords;

    unsigned int    m_nTextureId;

    m_pVertices = NULL;
    m_pTexCoords = NULL;
    m_nVertexCount = 0;
    m_nVBOVertices = m_nVBOTexCoords = m_nTextureId = 0;


    if( IsExtensionSupported( "GL_ARB_vertex_buffer_object" ) )
    {
        // Pobierz wska?niki na funkcje OpenGL 
        glGenBuffersARB = (PFNGLGENBUFFERSARBPROC) wglGetProcAddress("glGenBuffersARB");
        glBindBufferARB = (PFNGLBINDBUFFERARBPROC) wglGetProcAddress("glBindBufferARB");
        glBufferDataARB = (PFNGLBUFFERDATAARBPROC) wglGetProcAddress("glBufferDataARB");
        glDeleteBuffersARB = (PFNGLDELETEBUFFERSARBPROC) 
        wglGetProcAddress("glDeleteBuffersARB"); 
    }

    todrawquads=0;
    nIndex=0;


// my function counting how many quads I will draw


    for (i=0;i<MAX_CHUNKS_LOADED;i++)
    {
        if (chunks_loaded[i].created==1)
        {
            countquads(i);
        }
    }

    m_nVertexCount=4*todrawquads;

    m_pVertices = new CVec[m_nVertexCount];
    m_pTexCoords = new CTexCoord[m_nVertexCount];

// another my function adding every quad which i'm going to draw (its verticles) to array

    for (i=0;i<MAX_CHUNKS_LOADED;i++)
    {
        if (chunks_loaded[i].created==1)
        {
            addchunktodraw(i,m_pVertices,m_pTexCoords);
        }
    }


    glClearColor (1,1,1, 0.0);
    glColor3f(1,1,1);

    glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);        // Clear Screen And Depth Buffer
    glLoadIdentity ();                                          // Reset The Modelview Matrix

    fps++;

    // Camera settings.

    //gluLookAt (zom, zom, zom, 0.0, 0.0, 0.0, 0, 0, 1);

    gluLookAt (zoom, zoom, zoom, 0.0, 0.0, 0.0, 0, 0, 1);
    glRotatef((rot_x / 180 * 3.141592654f),1,0,0);  
    glRotatef((rot_y / 180 * 3.141592654f),0,1,0);
    glRotatef((rot_z / 180 * 3.141592654f),0,0,1);

    //m_nTextureId = t_terrain;

    // Generate And Bind The Vertex Buffer
    glGenBuffersARB( 1, &m_nVBOVertices );                          // Get A Valid Name
    glBindBufferARB( GL_ARRAY_BUFFER_ARB, m_nVBOVertices );         // Bind The Buffer
    // Load The Data
    glBufferDataARB( GL_ARRAY_BUFFER_ARB, m_nVertexCount*3*sizeof(float), m_pVertices, GL_STATIC_DRAW_ARB );

    // Generate And Bind The Texture Coordinate Buffer
    glGenBuffersARB( 1, &m_nVBOTexCoords );                         // Get A Valid Name
    glBindBufferARB( GL_ARRAY_BUFFER_ARB, m_nVBOTexCoords );        // Bind The Buffer
    // Load The Data
    glBufferDataARB( GL_ARRAY_BUFFER_ARB, m_nVertexCount*2*sizeof(float), m_pTexCoords, GL_STATIC_DRAW_ARB );

    // Enable Pointers
    glEnableClientState( GL_VERTEX_ARRAY );                     // Enable Vertex Arrays
    glEnableClientState( GL_TEXTURE_COORD_ARRAY );              // Enable Texture Coord Arrays

    glBindBufferARB( GL_ARRAY_BUFFER_ARB, m_nVBOVertices );
    glVertexPointer( 3, GL_FLOAT, 0, (char *) NULL );       // Set The Vertex Pointer To The Vertex Buffer
    glBindBufferARB( GL_ARRAY_BUFFER_ARB, m_nVBOTexCoords );
    glTexCoordPointer( 2, GL_FLOAT, 0, (char *) NULL );     // Set The TexCoord Pointer To The TexCoord Buffe

    glDrawArrays( GL_QUADS, 0, m_nVertexCount); // Draw All Of The Triangles At Once

    glDisableClientState( GL_VERTEX_ARRAY );                    // Disable Vertex Arrays
    glDisableClientState( GL_TEXTURE_COORD_ARRAY );             // Disable Texture Coord Arrays

    liniergb();

    glutSwapBuffers();

    delete [] m_pVertices; m_pVertices = NULL;
    delete [] m_pTexCoords; m_pTexCoords = NULL;
}

那么我能用它做什么呢？(上面的代码是主要绘制功能)

编辑

我动了这个:

if( IsExtensionSupported( "GL_ARB_vertex_buffer_object" ) )
{
    // Pobierz wska?niki na funkcje OpenGL 
    glGenBuffersARB = (PFNGLGENBUFFERSARBPROC) wglGetProcAddress("glGenBuffersARB");
    glBindBufferARB = (PFNGLBINDBUFFERARBPROC) wglGetProcAddress("glBindBufferARB");
    glBufferDataARB = (PFNGLBUFFERDATAARBPROC) wglGetProcAddress("glBufferDataARB");
    glDeleteBuffersARB = (PFNGLDELETEBUFFERSARBPROC) 
    wglGetProcAddress("glDeleteBuffersARB"); 
}

到我的主要功能.可能没什么改进.

EDIT2

现在,我也可以看到它在吃记忆.每隔几秒钟程序内存使用量就会越来越多......出了什么问题？我没有删除什么？

EDIT3

好的,非常感谢.我已经在绘制函数之外移动了一些代码并且...更多fps!非常感谢 !

http://img197.imageshack.us/img197/5193/fpsfinal.jpg

这是640x640块(因此大40倍)地图,650'000四边形(约70倍以上),仍然是~170 fps.好极了!没有内存泄漏.再次感谢 !

Answer 1

您正在重新加载所有缓冲区并在每个帧中再次释放它们？停止这样做,你的帧率会上升.

请注意,您的当前代码最终会用完VBO标识符,因为您永远不会删除您创建的VBO.

链接扩展函数绝对不需要每帧完成.