Question

我目前正在试图弄清楚VBO的工作原理是如何导致可怕的问题：/

我从.obj文件加载数据（请参阅：http://pastebin.com/B8uibDvV获取.obj文件）和（试图）把它放入VBO

我绑定数据的代码如下所示：

//Generate Buffers
glGenBuffers(1, &this->glVerticesBufferID);
glGenBuffers(1, &this->glIndexBufferID);

//bind the buffers to set the data
glBindBuffer(GL_ARRAY_BUFFER, this->glVerticesBufferID);
glBufferData(GL_ARRAY_BUFFER, this->verticesList.size() * sizeof(GLfloat), 0, GL_STATIC_DRAW);

glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, this->glIndexBufferID);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, this->indexList.size() * sizeof(GLshort), 0, GL_STATIC_DRAW);

glBufferSubData(GL_ARRAY_BUFFER, 0, this->verticesList.size(), this->verticesList.data()); 
glBufferSubData(GL_ELEMENT_ARRAY_BUFFER, 0, this->indexList.size(), this->indexList.data()); 

//Clear binds 
glBindBuffer(GL_ARRAY_BUFFER, 0);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);

最后我用这个渲染一切：

glBindBuffer(GL_ARRAY_BUFFER, this->glVerticesBufferID);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, this->glIndexBufferID);
glEnableClientState(GL_VERTEX_ARRAY);
    glDrawElements(GL_TRIANGLES, this->indexList.size(), GL_UNSIGNED_SHORT, this->indexList.data());
glDisableClientState(GL_VERTEX_ARRAY);
glBindBuffer(GL_ARRAY_BUFFER, 0);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);

最后我在VisualStudio 2010的输出中收到访问冲突消息

0xC0000005：访问冲突读取位置0x0147fbd8。

所以我的问题是怎么解决这个问题？（或者如果我错了怎么办呢）

---------------编辑1 ---------------

http://pastebin.com/DEbZH9iy

绑定数据

 glGenBuffers(1, &this->glVerticesBufferID);
 glBindBuffer(GL_ARRAY_BUFFER, this->glVerticesBufferID);
 glBufferData(GL_ARRAY_BUFFER, (this->verticesList.size() + this->textureCoordList.size() + this->normalsList.size()) * sizeof(GLfloat), 0, GL_STATIC_DRAW);
 glBufferSubData(GL_ARRAY_BUFFER,
                0,
                this->verticesList.size() * sizeof(GLfloat),
                this->verticesList.data()
               );
 glBufferSubData(
                GL_ARRAY_BUFFER, 
                this->verticesList.size() * sizeof(GLfloat), 
                this->normalsList.size() * sizeof(GLfloat), 
                this->normalsList.data()
               );
 glBufferSubData(
                GL_ARRAY_BUFFER, 
                (this->verticesList.size() + this->normalsList.size()) * sizeof(GLfloat), 
                this->textureCoordList.size() * sizeof(GLfloat),
                this->textureCoordList.data()
               );
 glBindBuffer(GL_ARRAY_BUFFER, 0);

 glGenBuffers(1, &this->glIndexBufferID);
 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, this->glIndexBufferID);
 glBufferData(GL_ELEMENT_ARRAY_BUFFER, this->indexList.size() * sizeof(GLushort), this->indexList.data(), GL_STATIC_DRAW);
 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);



 pub_glVerticesBufferID = glVerticesBufferID;
 pub_glIndexBufferID = glIndexBufferID;

渲染部分：

 glBindBuffer(GL_ARRAY_BUFFER, this->glVerticesBufferID);
 glVertexPointer(3, GL_FLOAT, 3 * sizeof(GLfloat), (GLvoid*)0);
 glNormalPointer(GL_FLOAT, 3 * sizeof(GLfloat), (GLvoid*)(this->verticesList.size() * sizeof(GLfloat)));
 glTexCoordPointer(2, GL_FLOAT, 2 * sizeof(GLfloat), (GLvoid*)((this->normalsList.size() + this->verticesList.size()) * sizeof(GLfloat)));
 glBindBuffer(GL_ARRAY_BUFFER, 0);

 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, this->glIndexBufferID);
 glDrawElements(GL_TRIANGLES, 3, GL_UNSIGNED_SHORT, 0);
 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);

Answer 1

您可能没有初始化OpenGL-1.1之后引入的功能的入口点。在Windows中，仅指定了OpenGL-1.1入口点，超出的所有内容都必须在运行时初始化。否则您将获得访问冲突。看看GLEW只需3行代码即可轻松完成繁琐的任务。

话虽如此，您的代码仍然存在错误：

你需要告诉OpenGL从缓冲区到哪里应该采用它的元素。这是通过调用gl…Pointer函数来完成的，数据元素是缓冲区中的字节偏移量。你的代码错过了。另外glDrawElements不再期望指针也被放置偏移量。

但是如果绑定了缓冲区对象，则不应导致段错误/访问冲突。

调用glDrawElements会导致访问冲突

1 个答案: