text: #ifdef PACC_GL_ES
  #  ifdef PACC_GL_3
  #include <GLES3/gl3.h>
  #  else
  #include <GLES2/gl2.h>
  #  endif
  #else
  #define GL_GLEXT_PROTOTYPES
  #  ifdef PACC_GL_3
  #include <GL/glcorearb.h>
  #  else
  #include <GL/gl.h>
  #include <GL/glext.h>
  #  endif
  #endif
  