glGenXxxGLsizei

glGenXxxGLsizei is a naming convention used in the OpenGL API for functions that generate one or more object names. The "Xxx" part of the name represents the type of object being generated, such as "Textures" for texture objects, "Buffers" for buffer objects, or "Queries" for query objects. The "GLsizei" suffix indicates that the function takes a GLsizei argument, which is an unsigned integer type used to specify sizes and counts in OpenGL.

These functions are typically used to obtain unique identifiers for OpenGL resources. For example, glGenTextures generates one or more texture names, glGenBuffers generates buffer object names, and glGenQueries generates query object names. The generated names are not directly usable; they are simply integer handles that OpenGL uses internally to refer to the created objects.

The typical usage pattern involves calling the function with a count and a pointer to an array of GLuint variables. The function populates this array with the generated names. After obtaining these names, you would typically bind the corresponding object type to one of the generated names to perform operations on it. For instance, after calling glGenTextures, you would use glBindTexture to associate a texture object with a generated texture name.

It is important to note that the generated names are not guaranteed to be contiguous or sequential. When an object is deleted using the corresponding glDeleteXxx function, its name can be reused by subsequent glGenXxx calls. This mechanism helps manage OpenGL object resources efficiently.