GLAPI void glad_set_pre_callback(GLADcallback cb);
GLAPI void glad_set_post_callback(GLADcallback cb);
GLAPI void glad_set_pre_callback(GLADcallback cb);
GLAPI void glad_set_post_callback(GLADcallback cb);
typedef unsigned int GLenum;
typedef unsigned char GLboolean;
typedef unsigned int GLbitfield;
typedef unsigned int GLenum;
typedef unsigned char GLboolean;
typedef unsigned int GLbitfield;