#Spec method map reading update
You can clear the buffer after allocation if you wish to update it. You may pass NULL for this parameter if you do, the initial contents of the buffer will be undefined. OpenGL will copy that data into the buffer object upon initialization. size represents how many bytes you want to allocate in this buffer object.ĭata is a pointer to an array of bytes of size in length. The target parameter is just like the one for glBindBuffer it says which bound buffer to modify. Void glBufferStorage(GLenum target, GLsizeiptr size, const GLvoid * data, GLbitfield flags) To allocate immutable storage for buffer objects, you call this function: But you cannot do the glBufferData(., NULL) trick to invalidate it if the storage is immutable. You may still invalidate it with an explicit invalidation command or through mapping the buffer. When this is done, you will be unable to reallocate that storage. Much like immutable storage textures, the storage for buffer objects can be allocated immutably. Allocating immutable storage for a buffer changes the nature of how you can interact with the buffer object. There are two ways to allocate storage for buffer objects: mutable or immutable. This memory must be allocated before it can be uploaded to or used. When you're just creating, filling the buffer object with data, or both, the target you use doesn't technically matter.īuffer objects hold a linear array of memory of arbitrary size. The target defines how you intend to use this binding of the buffer object. Void glBindBuffer(enum target, uint bufferName) To set up its internal state, you must bind it to the context. These use the standard Gen/Delete paradigm as most OpenGL objects.Īs with the standard OpenGL object paradigm, this only creates the object's name, the reference to the object. To create a buffer object, you call glGenBuffers. Buffer Objects are OpenGL Objects they therefore follow all of the rules of regular OpenGL objects.
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