From: umbagnal AT cc DOT umanitoba DOT ca (Kevin Bagnall)
Newsgroups: comp.os.msdos.djgpp
Subject: Allegro.h to GNU Pascal unit conversion?
Date: 3 Mar 1997 03:12:56 GMT
Organization: The University of Manitoba
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To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp

I know this is more of a Pascal question, but I figured "GNU Pascal for DOS" 
programmers would also be DJGPP programmers.

Anyways here is my problem.  I am forced to use pascal for a final project in a 
course I am taking and would like to use the Allegro library.  I am going to 
use GNU Pascal for DJGPP so I can access lots of memory(which I need for 
lookahead-moves in a game of Connect-4) and it's an optimized 32-bit compiler. 
 I've benchmarked Turbo Pascal 7.0 and GNU Pascal and found the GNU version is 
6 times faster!  First of all, has anyone already converted the allegro.h 
header file to a GNU Pascal unit?  If not, then I'll have to convert parts of 
it myself, specificaly some of the screen,bitmap,graphics, and sprite 
declarations.  I know how to convert simple C declarations to pascal such as 
this:

-C version-
struct POINT
{
	int x;
	int y;
}

-Pascal version-
POINT = record
		x:integer;
		y:integer;
	end;

But in allegro.h there is the GFX_VTABLE declaration which has the following:

int  (*getpixel)(struct BITMAP *bmp, int x, int y);
void (*putpixel)(struct BITMAP *bmp, int x, int y, int color);
.
.
etc.

Is the second a pointer to a function? How would I change these to GNU pascal?

Later I might convert the entire allegro.h file.  I'm probably not the right 
person to do this since I've only written two small C programs in my life and 
I'm new to both DJGPP and GNU Pascal(but not pascal).

-Kevin Bagnall