Question

我目前正在尝试使用OpenGL在C ++中编写Pacman。我目前正在尝试创建一个显示列表来绘制迷宫。我的想法是创建一个方形瓷砖，然后只要matrix指示某个位置的墙段，就显示所述瓷砖。我的代码是：

const unsigned int FREE = 0;
const unsigned int WALL = 1;
const unsigned int GHOST_WALL = 2;

const unsigned int matrix[22][19] = {
    {1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1},
    {1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1},
    {1, 0, 1, 1, 0, 1, 1, 1, 0, 1, 0, 1, 1, 1, 0, 1, 1, 0, 1},
    {1, 0, 1, 1, 0, 1, 1, 1, 0, 1, 0, 1, 1, 1, 0, 1, 1, 0, 1},
    {1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1},
    {1, 0, 1, 1, 0, 1, 0, 1, 1, 1, 1, 1, 0, 1, 0, 1, 1, 0, 1},
    {1, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 1},
    {1, 1, 1, 1, 0, 1, 1, 1, 0, 1, 0, 1, 1, 1, 0, 1, 1, 1, 1},
    {1, 1, 1, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 1, 1, 1},
    {1, 1, 1, 1, 0, 1, 0, 1, 1, 2, 1, 1, 0, 1, 0, 1, 1, 1, 1},
    {0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0},
    {1, 1, 1, 1, 0, 1, 0, 1, 1, 1, 1, 1, 0, 1, 0, 1, 1, 1, 1},
    {1, 1, 1, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 1, 1, 1},
    {1, 1, 1, 1, 0, 1, 0, 1, 1, 1, 1, 1, 0, 1, 0, 1, 1, 1, 1},
    {1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1},
    {1, 0, 1, 1, 0, 1, 1, 1, 0, 1, 0, 1, 1, 1, 0, 1, 1, 0, 1},
    {1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1},
    {1, 1, 0, 1, 0, 1, 0, 1, 1, 1, 1, 1, 0, 1, 0, 1, 0, 1, 1},
    {1, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 1},
    {1, 0, 1, 1, 1, 1, 1, 1, 0, 1, 0, 1, 1, 1, 1, 1, 1, 0, 1},
    {1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1},
    {1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1}
};

GLuint tile_handle = 0;
GLuint maze_handle = 0;

/*
 * Initialize maze by precompiling its components
 */
void maze_init() {
    // request a single display list handle for the tile
    tile_handle = glGenLists(1);

    glNewList(tile_handle, GL_COMPILE);
    glColor3f(0, 0, 0.7f);  // Blue
        glBegin(GL_QUADS);
            glVertex2i(0,0);
            glVertex2i(1,0);
            glVertex2i(1,1);
            glVertex2i(0,1);
        glEnd();
    glEndList();


    // request a single display list handle for the entire maze
    maze_handle = glGenLists(1);

    glNewList(maze_handle, GL_COMPILE);
    glColor3f(0, 0, 0.7f);  // Blue
        for(int row = 0; row < 22; row--) {
            for(int col = 0; col < 19; col++) {
                if(matrix[21-row][col] == WALL) {
                    glPushMatrix();
                        glScaled(30, 30, 1);
                        glTranslated(col, row, 0);
                        glCallList(tile_handle);
                    glPopMatrix();
                }
            }
        }
    glEndList();
}

然后我在我的主要初始化方法中使用maze_init()并在我的主显示功能中使用调用glCallList(maze_handle);。编译得很好，但是当我尝试运行它时，它会给我Bus error: 10错误。

现在我尝试了同样没有glNewList(maze_handle, GL_COMPILE);定义中的循环并且运行正常。因此我的问题是：为什么调用列表中的循环（或条件语句）会产生总线错误？

我在glNewList(maze_handle, GL_COMPILE);内尝试了一个简单的循环，它调用了DISTINCT显示列表并且运行正常。那么问题就是我重复调用同一个显示列表？出于某种原因，我似乎无法在这里找到问题......

OpenGL c ++中嵌套的glCallList

0 个答案: