在简单的OpenGL应用程序中"访问冲突读取位置0x000000000"

Question

当使用缓冲区对象存储顶点数组时,我在openGL中遇到问题.当我运行代码时,会出现一个窗口,显示消息" 访问冲突读取位置0x000000000 ",当我将光标移动到glGenBuufers函数旁边的箭头时,我看到描述:这是当该线程从当前函数返回时执行的下一个语句.

码:

int frame=0;
void display();
void datasource();

 GLuint vbo;

void datasource()
{
    GLfloat vertex1[]={-1.000000 ,0.500000 ,-0.700000 ,0.500000 ,-1.000000 ,0.800000 ,-0.700000 ,0.800000 ,-0.400000 ,0.500000 ,-0.100000 ,0.500000 ,-0.400000 ,0.800000 ,-0.100000 ,0.200000 ,0.500000 ,0.500000 ,0.500000 ,0.200000 ,0.800000 ,0.500000,0.800000 ,0.800000 ,0.800000 ,0.500000 ,1.100000 ,0.500000 ,0.800000 ,0.800000 ,1.100000,0.800000  };

    glGenBuffers(1,&vbo);
    glBindBuffer(GL_ARRAY_BUFFER,vbo);
    glBufferData(GL_ARRAY_BUFFER,sizeof(vertex1),vertex1,GL_STATIC_DRAW);
}


void init(int arc,char **arch)
{
    glutInit(&arc,arch);
    glutInitWindowSize(800,800);
    glutInitDisplayMode(GLUT_DEPTH | GLUT_DOUBLE | GLUT_RGBA);
    glutCreateWindow("chess");
    glClearColor(0.0,0.0,0.0,0.0);
    glutDisplayFunc(display);
}

int main(int arc,char **arch)
{
    init(arc,arch);
    datasource();
    glutMainLoop();
    return 0;
}

void display()
{
    frame++;
    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
    glDrawArrays(GL_TRIANGLE_STRIP,0,8);
    glutSwapBuffers();
    glutPostRedisplay();
}

我做错了什么？

Answer 1

glGenBuffers,glBindBuffer和glBufferData是Vertex Buffer Object 扩展或OpenGL-1.5的函数.默认系统ABI仅转到OpenGL-1.2,因此您需要在使用之前加载扩展的OpenGL功能.仅包含标题是不够的,因为那些只是为您提供未初始化的符号.

最简单的方法:

1. 从http://glew.sf.net下载并安装GLEW
2. 替换所有出现#include <GL/gl.h>的#include <GL/glew.h>
3. 通话glewInit()之后glutCreateWindow,检查错误代码
4. 检查VBO是否可用(即至少GL_ARB_vertex_buffer_object或OpenGL版本> = 1.5)
5. 将GLEW库添加到链接器设置