Update help files [ci-skip]

internal/help/SUB.txt

@@ -24,8 +24,9 @@ A '''SUB''' procedure is a procedure within a program that can calculate and ret
 * SUB procedures can save program memory as all memory used in a SUB is released on procedure exit except for [[STATIC]] values.
 * [[_DEFINE]] can be used to define all new or old QB64 variable [[TYPE]] definitions instead of DEF***.
 * [[$INCLUDE]] text library files with needed SUB and [[FUNCTION]] procedures can be included in programs after all sub-procedures.
-* '''QB64 ignores all procedural DECLARE statements!''' Define all ''parameter'' [[TYPE]]s in the SUB procedure.
+* '''QB64 ignores all procedural DECLARE statements.''' Define all ''parameter'' [[TYPE]]s in the SUB procedure.
 *  '''Images are not deallocated when the [[SUB]] or [[FUNCTION]] they are created in ends. Free them with [[_FREEIMAGE]].'''
+* In order to use OpenGL commands you need a [[SUB]] [[_GL]] in your program.
 
 
 ''Example 1:'' Text [[PRINT]] screen centering using [[PEEK]] to find the SCREEN mode width. Call and SUB procedure code:
@@ -75,6 +76,7 @@ exit 1
 
 ''See also:'' 
 * [[FUNCTION]], [[CALL]]
+* '''SUB''' [[_GL]]
 * [[BYVAL]], [[SCREEN (statement)]]
 * [[EXIT]], [[END]]
 

internal/help/_GL.txt

@@ -0,0 +1,48 @@
+{{DISPLAYTITLE:_GL}}
+In order to use OpenGL drawing commands, you must do so from inside a [[SUB]] procedure called '''_GL''', which enables the commands to be rendered.
+
+
+{{PageSyntax}}
+:[[SUB]] _GL
+:: ''REM Your OpenGL code here
+: [[END]] [[SUB]]
+
+{{PageDescription}}
+* OpenGL commands are valid outside of '''SUB _GL''', as long as the sub procedure exists in your code.
+* Attempting to use OpenGL commands without having '''SUB _GL''' in a program will result in a '''Syntax error''', even if the syntax is valid.
+* SUB '''_GL''' cannot be invoked manually. The code inside it will be called automatically at approximately 60 frames per second.
+* Using [[INPUT]] inside SUB '''_GL''' will crash your program.
+* If your program needs to perform any operations before SUB _GL must be run, it is recommended to use a shared variable as a flag to allow SUB _GL's contents to be run. See example below.
+
+
+==Example==
+
+{{CodeStart}} '' ''
+{{Cl|DIM}} allowGL {{Cl|AS}} {{Cl|_BYTE}}
+
+'perform startup routines like loading assets
+
+allowGL = -1 'sets allowGL to true so SUB _GL can run
+
+{{Cl|DO}}
+    {{Cl|_LIMIT}} 1 'runs the main loop at 1 cycle per second
+    'notice how the main loop doesn't do anything, as SUB _GL will be running
+    'continuously.
+{{Cl|LOOP}}
+
+{{Cl|SUB}} {{Cl|_GL}}
+    {{Cl|IF}} NOT allowGL {{Cl|THEN}} {{Cl|EXIT}} {{Cl|SUB}} 'used to bypass running the code below until
+    '                             startup routines are done in the main module
+
+    'OpenGL code starts here
+    'The code in this area will be run automatically at ~60fps
+{{Cl|END}} {{Cl|SUB}} '' ''
+{{CodeEnd}}
+
+
+{{PageSeeAlso}}
+* [[_GLRENDER]]
+* [[SUB]]
+
+
+{{PageNavigation}}