VBO纹理不起作用

Question

问题是这段代码什么也没有显示。我有我的负载纹理问题。如果我评论关于纹理处理的代码行，它可以很好地工作。它显示一个4色的正方形。你可以帮我吗 ？

#define OFFSET_BUFFER(bytes) ((GLfloat *)NULL + bytes) 

GLfloat vertices[12] = 
{ 
    -1.0f, -1.0f, 1.0f, 
    -1.0f, 1.0f, 1.0f, 
    1.0f, 1.0f, 1.0f, 
    1.0f, -1.0f, 1.0f, 
}; 

GLfloat colors[12] = 
{ 
    1.0f, 0.0f, 0.0f, 
    0.0f, 1.0f, 0.0f, 
    0.0f, 0.0f, 1.0f, 
    1.0f, 0.0f, 1.0f, 
}; 

GLfloat texture[8] = 
{ 
    0.0f, 0.0f, 
    1.0f, 0.0f, 
    1.0f, 1.0f, 
    0.0f, 1.0f 
}; 

int main(int argc, char *argv[]) 
{ 
    SDL_Init(SDL_INIT_VIDEO); 
    SDL_WM_SetCaption("Texture Mapping",NULL); 
    SDL_SetVideoMode(500, 500, 32, SDL_OPENGL); 

    bool continuer = true; 
    SDL_Event event; 
    GLuint buf[2]; 
    GLuint texture1; 

    glClearDepth(1.0f); 
    glClearColor(0.1f, 0.1f, 0.1f, 0.1f); 
    glEnable(GL_DEPTH_TEST); 
    glMatrixMode(GL_PROJECTION); 
    glLoadIdentity(); 
    gluPerspective(70.0f, (float)500.0f/(float)500.0f, 1.0f, 3000.0f); 
    glewInit(); 

    texture1 = loadTexture("caisse.jpg"); 
    glBindTexture(GL_TEXTURE_2D, texture1); 

    glGenBuffers(2, &buf[0]); 
    glBindBuffer(GL_ARRAY_BUFFER, buf[0]); 
    glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW); 

    glBindBuffer(GL_ARRAY_BUFFER, buf[1]); 
    glBufferData(GL_ARRAY_BUFFER, sizeof(colors), colors, GL_STATIC_DRAW); 

    glBindBuffer(GL_ARRAY_BUFFER, texture1); 
    glBufferData(GL_ARRAY_BUFFER, sizeof(texture), texture, GL_STATIC_DRAW); 

    while (continuer) 
    { 
     SDL_WaitEvent(&event); 
     switch(event.type) 
     { 
      case SDL_QUIT: 
       continuer = false; 
     } 

     glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); 

     glEnable(GL_TEXTURE_2D); 

     glMatrixMode(GL_MODELVIEW); 
     glLoadIdentity(); 

     gluLookAt(0.0f, 0.0f, 3.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, 0.0f); 

     glBindBuffer(GL_ARRAY_BUFFER, buf[0]); 
     glVertexPointer(3, GL_FLOAT, 0, OFFSET_BUFFER(0)); 

     glBindBuffer(GL_ARRAY_BUFFER, buf[1]); 
     glColorPointer(3, GL_FLOAT, 0, OFFSET_BUFFER(0)); 

     glBindBuffer(GL_ARRAY_BUFFER, texture1); 
     glTexCoordPointer(2, GL_FLOAT, 0, OFFSET_BUFFER(0)); 

     glEnableClientState(GL_VERTEX_ARRAY); 
     glEnableClientState(GL_COLOR_ARRAY); 
     glEnableClientState(GL_TEXTURE_COORD_ARRAY); 

     glDrawArrays(GL_QUADS, 0, 4); 

     glDisableClientState(GL_TEXTURE_COORD_ARRAY); 
     glDisableClientState(GL_COLOR_ARRAY); 
     glDisableClientState(GL_VERTEX_ARRAY); 


     glDisable(GL_TEXTURE_2D); 

     glFlush(); 
     SDL_GL_SwapBuffers(); 
    } 

    SDL_Quit(); 

    return 0; 
} 

Answer 1

首先，你需要开始把glGetError()在你的代码进行调试，因为你肯定在这里产生一些错误。

你用glBindBuffer绑定你的纹理texture1，这样做不正确。纹理坐标与纹理不同。您应该生成3个缓冲区而不是2个，并将texture[8] texcoords加载到第三个缓冲区中。