OpenGL顶点数组/缓冲区对象 [英] OpenGL Vertex Array/Buffer Objects

问题描述

问题1

在某个VAO下创建的顶点缓冲对象是否会被删除?

Do vertex buffer objects created under a certain VAO deleted once that VAO is deleted?

一个例子:

glGenBuffers(1, &bufferObject);
glGenVertexArrays(1, &VAO);

glBindVertexArray(VAO);
glBindBuffer(GL_ARRAY_BUFFER, bufferObject);
glBufferData(GL_ARRAY_BUFFER, sizeof(someVertices), someVertices, 
             GL_STATIC_DRAW);
glEnableVertexAttribArray(positionAttrib);
glVertexAttribPointer(positionAttrib, 3, GL_FLOAT, GL_FALSE, 0, NULL);

稍后调用glDeleteVertexArrays(1, &VAO);时，bufferObject也将被删除吗?

When later calling glDeleteVertexArrays(1, &VAO);, will bufferObject be deleted as well?

我问的原因是，我在网络上看到了一些没有删除这些缓冲区对象的示例.

The reason I'm asking is that I saw a few examples over the web that didn't delete those buffer objects.

问题2

我可以为缓冲区对象分配的最大内存量是多少?当然，它必须依赖于系统，但是我似乎找不到对此的估计.当视频RAM不够大时会发生什么?我怎么知道?

What is the maximum amount of memory that I can allocate for buffer objects? It must be system dependent of course, but I can't seem find an estimation for it. What happens when video RAM isn't big enough? How would I know?

推荐答案

答案1

这取决于.如果您以前调用过glDeleteBuffers，则在删除VAO时将其删除.如果没有，它不会. VAO拥有对VBO的引用，调用glGenBuffers后，您的应用程序也是如此.删除VBO之前，必须先释放两个引用.

It depends. If you called glDeleteBuffers before, it will be deleted when you delete the VAO. If not, it won't. The VAO holds a reference to the VBO, and so does your application after calling glGenBuffers. Both references need to be released before the VBO is deleted.

答案2

(afaik)无法查询您可以分配的最大金额.但是，根据参考文档，glBufferData将发出GL_OUT_OF_MEMORY如果不能分配缓冲区.

There's (afaik) no way to query the maximum amount you can allocate. However, according to the reference documentation, glBufferData will emit GL_OUT_OF_MEMORY if a buffer can not be allocated.

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