Doom 1 render

[SBM Productions]

I wanted to do a little toy Doom1 style render, completely in software. However gfxlib's pset command is a little slow. Does anyone have a remedy for it? Also, how would I use inline asm to fill an array?

[Anonymous]

Code:

screen 13

dim shared as integer screen_x, screen_y
screeninfo screen_x, screen_y

dim p as ubyte ptr ' 8 bits for 8-bit color ;p

dim as integer x = 200
dim as integer y = 100
dim as integer col = 15

p = screenptr

screenlock
  p [( y * screen_x ) + x] = col

screenunlock

not tested. use a pointer to a data type ( color_depth \ 8 )

dunno asm ;P

[SBM Productions]

so..umm...does anyone have any ideas on how to do the asm thing?

[Sterling Christensen]

Cha0s's code with Inline assembler:

Code:

screen 13

dim shared as integer screen_x = 320, screen_y = 200
screeninfo screen_x, screen_y

dim p as ubyte ptr ' 8 bits for 8-bit color ;p

dim as integer x = 200
dim as integer y = 100
dim as integer col = 15

p = screenptr

screenlock
'  p [( y * screen_x ) + x] = col
' Ported to assembler:
' for more speed, try a look up table instead of mul
asm
    mov edi, [p]
    mov eax, [screen_x]
    mul dword ptr [y]
    add eax, [x]
    mov dl, [col]
    mov [edi+eax], dl
end asm

screenunlock

[SBM Productions]

So if I wanted to extract info from a 1d array I'd just find the pointer to it then use it like in the code?

[Sterling Christensen]

So if I wanted to extract info from a 1d array I'd just find the pointer to it then use it like in the code?

Sure, the above asm would work for a 2d array of bytes. For a 1d array, or something other than bytes, the asm needs to be modified slightly. It would also need to be changed to extract instead of overwrite data in the array.

[relsoft]

http://rel.betterwebber.com/junk.php?id=29

Warning: Code is FB pre-beta release. :*)