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Ondrej Novak 2025-01-24 18:27:22 +01:00
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3DTEST/TEXTURAA.ASM Normal file
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.model small
.386
DGROUP group _DATA
extrn _start_poss:word
extrn _end_poss:word
extrn _scr_max_x:dword
extrn _scr_next_line:dword
_TEXT segment byte public 'CODE' use32
assume CS:_TEXT
assume DS:DGROUP
public draw_flat_triangle_
draw_flat_triangle_:
dft_lp2:mov ebx,edi
movsx edx,_start_poss[esi*2]
lea edi,[ebx+edx*2]
cmp dx,_end_poss[esi*2]
jz dft_skpa
jl dft_dirr
std
cmp edx,0
js dft_skpa
cmp edx,_scr_max_x
jbe dft_drr1
mov edi,_scr_max_x
lea edi,[ebx+edi*2]
jmp dft_drr1
dft_dirr:cld
cmp edx,_scr_max_x
jg dft_skpa
cmp edx,0
jns dft_drr1
mov edi,ebx
dft_drr1:movsx edx,_end_poss[esi*2]
cmp edx,0
jns dft_dc1
xor edx,edx
jmp dft_dc2
dft_dc1:cmp edx,_scr_max_x
jna dft_dc2
mov edx,_scr_max_x
dft_dc2:shl edx,1
add edx,ebx
dft_lp1: stosw
cmp edi,edx
jnz dft_lp1
dft_skpa:
stosw
mov edi,_scr_next_line
lea edi,[ebx+edi]
inc esi
dec ecx
jnz dft_lp2
cld
ret
_TEXT ends
end