OpenGL Programming Guide: The Official Guide to Learning OpenGL, Version 4.3, Eighth Edition

Instanced Vertex Attributes

Instanced vertex attributes behave similarly to regular vertex attributes. They are declared and used in exactly the same way inside the vertex shader. On the application side, they are also configured in the same way as regular vertex attributes. That is, they are backed by buffer objects, can be queried with glGetAttribLocation(), set up using glVertexAttribPointer(), and enabled and disabled using glEnableVertexAttribArray() and glDisableVertexAttribArray(). The important new function that allows a vertex attribute to become instanced is as follows:

void glVertexAttribDivisor(GLuint index, GLuint divisor);

Specifies the rate at which new values of the instanced the vertex attribute at index are presented to the ...