glDisableVertexAttribArray0

glDisableVertexAttribArray is a function in the OpenGL API used to disable a generic vertex attribute array. When a vertex attribute array is enabled, it specifies that data for a particular attribute (such as position, color, or texture coordinates) should be read from a buffer object at a specified location. Disabling a vertex attribute array signals to OpenGL that the attribute data for subsequent drawing commands will not be sourced from that array.

This function is typically used when an application no longer needs to supply a particular vertex attribute. For instance, if a shader program is changed to one that does not utilize a specific attribute, that attribute's array can be disabled to avoid unnecessary overhead. The function takes a single argument: an integer representing the index of the vertex attribute array to disable. This index corresponds to the location previously specified when enabling the attribute using glEnableVertexAttribArray and when defining the pointer to the data using glVertexAttribPointer.

Disabling an attribute array does not affect the data that has already been uploaded to the graphics card or the current state of the vertex buffer object. It solely controls whether OpenGL will attempt to fetch data for that attribute from the specified array for rendering. It is good practice to disable vertex attribute arrays that are no longer in use to ensure efficient rendering and to prevent potential confusion about which attributes are active.