[fpc-pascal] Re: interested in building a library for functions?

[Angel Montesinos]

> I think the Superficies version 2 is newer and preferred for porting.
> The 3-D images are rotated nicely without OpenGL support. Good.
>
> I tried to convert it but there are 3rd party components which are not
> ported to Lazarus.
> Also, there are references to TBitmap.ScanLine which is not portable.
> The Superficies v.1 seems to have much more of them, so the code has
> become more portable.
>
> What are the 64-bit problems you faced?
>
> Regards,
> Juha Manninen

Please, take a look to the file  OCFunctDDDoubleSafeIntegrals.pas  in 
Superficies_En. Then perhaps you may understand that it is a sort of 
minicompiler that converts strings to object code: a minicompiler that 
cannot be based on fpc. Thus, the problem of porting to 64bits (or by 
the same token to other architectures) is to change the opcodes used 
in building that object code, and also to change the relation between 
the function code and the preparation that fpc must make prior to 
calling that code, and the use that fpc will do of the results of that 
code.

An added difficulty that I have thumped with is that the debugger of 
fpc-Lazarus does not move, by pressing F7, from instruction to 
instruction in the CPU window, so that is difficult to catch where the 
errors arise. Another one, lesser, is that the assembler of the 
debugger CPU window is different from that used in AMD or Intel 
description of their architecture and machine instructions.

I updated yesterday Superficies so that now it may be used when the 
DEP (Data Execution Prevention) of Windows is enabled for all 
programs. I think also that by  windows emulation it may run in Linux. 
I am working now in making DEP compatible the other programs in my web 
page.

I know about ScanLine and components problems, and think that they are 
not difficult to bypass by using GR32 or other tricks. But this is not 
my problem at present.

I did not use OpenGl mainly because I believe that is does not provide 
a mechanism for identifying on what point of the drawn surface is the 
mouse when it moves on the surface. This is a must for many things in 
my programs.

-- 
montesin at uv dot es