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;*
;* tmap.nas
;* The texture-mapping inner loops in pure assembly language.
;*
;*---------------------------------------------------------------------------
;* Copyright 1998-2006 Randy Heit
;* All rights reserved.
;*
;* Redistribution and use in source and binary forms, with or without
;* modification, are permitted provided that the following conditions
;* are met:
;*
;* 1. Redistributions of source code must retain the above copyright
;* notice, this list of conditions and the following disclaimer.
;* 2. Redistributions in binary form must reproduce the above copyright
;* notice, this list of conditions and the following disclaimer in the
;* documentation and/or other materials provided with the distribution.
;* 3. The name of the author may not be used to endorse or promote products
;* derived from this software without specific prior written permission.
;*
;* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
;* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
;* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
;* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
;* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
;* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
;* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
;* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
;* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
;* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
;*---------------------------------------------------------------------------
;*
BITS 32
; Segment/section definition macros.
SECTION .data
%define SPACEFILLER4 (0x44444444)
; If you change this in r_draw.c, be sure to change it here, too!
FUZZTABLE equ 50
%ifdef M_TARGET_LINUX
EXTERN ylookup
EXTERN centery
EXTERN fuzzpos
EXTERN fuzzoffset
EXTERN NormalLight
EXTERN realviewheight
EXTERN fuzzviewheight
EXTERN CPU
EXTERN dc_pitch
EXTERN dc_colormap
EXTERN dc_iscale
EXTERN dc_texturefrac
EXTERN dc_source
EXTERN dc_yl
EXTERN dc_yh
EXTERN dc_x
EXTERN dc_count
EXTERN dc_dest
EXTERN dc_destorg
EXTERN dc_ctspan
EXTERN dc_temp
EXTERN ds_xstep
EXTERN ds_ystep
EXTERN ds_colormap
EXTERN ds_source
EXTERN ds_x1
EXTERN ds_x2
EXTERN ds_xfrac
EXTERN ds_yfrac
EXTERN ds_y
GLOBAL ds_cursource
GLOBAL ds_curcolormap
%else
EXTERN _ylookup
EXTERN _centery
EXTERN _fuzzpos
EXTERN _fuzzoffset
EXTERN _NormalLight
EXTERN _realviewheight
EXTERN _fuzzviewheight
EXTERN _CPU
EXTERN _dc_pitch
EXTERN _dc_colormap
EXTERN _dc_iscale
EXTERN _dc_texturefrac
EXTERN _dc_source
EXTERN _dc_yl
EXTERN _dc_yh
EXTERN _dc_x
EXTERN _dc_count
EXTERN _dc_dest
EXTERN _dc_destorg
EXTERN _dc_ctspan
EXTERN _dc_temp
EXTERN _ds_xstep
EXTERN _ds_ystep
EXTERN _ds_colormap
EXTERN _ds_source
EXTERN _ds_x1
EXTERN _ds_x2
EXTERN _ds_xfrac
EXTERN _ds_yfrac
EXTERN _ds_y
GLOBAL _ds_cursource
GLOBAL _ds_curcolormap
%define ylookup _ylookup
%define centery _centery
%define fuzzpos _fuzzpos
%define fuzzoffset _fuzzoffset
%define NormalLight _NormalLight
%define realviewheight _realviewheight
%define fuzzviewheight _fuzzviewheight
%define CPU _CPU
%define dc_pitch _dc_pitch
%define dc_colormap _dc_colormap
%define dc_iscale _dc_iscale
%define dc_texturefrac _dc_texturefrac
%define dc_source _dc_source
%define dc_yl _dc_yl
%define dc_yh _dc_yh
%define dc_x _dc_x
%define dc_count _dc_count
%define dc_dest _dc_dest
%define dc_destorg _dc_destorg
%define dc_ctspan _dc_ctspan
%define dc_temp _dc_temp
%define ds_xstep _ds_xstep
%define ds_ystep _ds_ystep
%define ds_colormap _ds_colormap
%define ds_source _ds_source
%define ds_x1 _ds_x1
%define ds_x2 _ds_x2
%define ds_xfrac _ds_xfrac
%define ds_yfrac _ds_yfrac
%define ds_y _ds_y
%define R_SetSpanSource_ASM _R_SetSpanSource_ASM
%define R_SetSpanSize_ASM _R_SetSpanSize_ASM
%define R_SetSpanColormap_ASM _R_SetSpanColormap_ASM
%endif
_ds_cursource:
ds_cursource:
DD 0
_ds_curcolormap:
ds_curcolormap:
DD 0
; Local stuff:
lastAddress DD 0
pixelcount DD 0
SECTION .text
GLOBAL @R_SetSpanSource_ASM@4
GLOBAL R_SetSpanSource_ASM
R_SetSpanSource_ASM:
mov ecx,[esp+4]
@R_SetSpanSource_ASM@4:
mov [spreada+2],ecx
mov [spreadb+2],ecx
mov [spreadc+2],ecx
mov [spreadd+2],ecx
mov [spreade+2],ecx
mov [spreadf+2],ecx
mov [spreadg+2],ecx
mov [mspreada+2],ecx
mov [mspreadb+2],ecx
mov [mspreadc+2],ecx
mov [mspreadd+2],ecx
mov [mspreade+2],ecx
mov [mspreadf+2],ecx
mov [mspreadg+2],ecx
mov [ds_cursource],ecx
ret
GLOBAL @R_SetSpanColormap_ASM@4
GLOBAL R_SetSpanColormap_ASM
R_SetSpanColormap_ASM:
mov ecx,[esp+4]
@R_SetSpanColormap_ASM@4:
mov [spmapa+2],ecx
mov [spmapb+2],ecx
mov [spmapc+2],ecx
mov [spmapd+2],ecx
mov [spmape+2],ecx
mov [spmapf+2],ecx
mov [spmapg+2],ecx
mov [mspmapa+2],ecx
mov [mspmapb+2],ecx
mov [mspmapc+2],ecx
mov [mspmapd+2],ecx
mov [mspmape+2],ecx
mov [mspmapf+2],ecx
mov [mspmapg+2],ecx
mov [ds_curcolormap],ecx
ret
GLOBAL R_SetSpanSize_ASM
EXTERN SetTiltedSpanSize
R_SetSpanSize_ASM:
mov edx,[esp+4]
mov ecx,[esp+8]
call SetTiltedSpanSize
mov [dsy1+2],dl
mov [dsy2+2],dl
mov [dsx1+2],cl
mov [dsx2+2],cl
mov [dsx3+2],cl
mov [dsx4+2],cl
mov [dsx5+2],cl
mov [dsx6+2],cl
mov [dsx7+2],cl
mov [dmsy1+2],dl
mov [dmsy2+2],dl
mov [dmsx1+2],cl
mov [dmsx2+2],cl
mov [dmsx3+2],cl
mov [dmsx4+2],cl
mov [dmsx5+2],cl
mov [dmsx6+2],cl
mov [dmsx7+2],cl
push ecx
add ecx,edx
mov eax,1
shl eax,cl
dec eax
mov [dsm1+2],eax
mov [dsm5+1],eax
mov [dsm6+1],eax
mov [dsm7+1],eax
mov [dmsm1+2],eax
mov [dmsm5+1],eax
mov [dmsm6+1],eax
mov [dmsm7+1],eax
pop ecx
ror eax,cl
mov [dsm2+2],eax
mov [dsm3+2],eax
mov [dsm4+2],eax
mov [dmsm2+2],eax
mov [dmsm3+2],eax
mov [dmsm4+2],eax
and eax,0xffff
not eax
mov [dsm8+2],eax
mov [dsm9+2],eax
mov [dmsm8+2],eax
mov [dmsm9+2],eax
neg dl
mov [dsy3+2],dl
mov [dsy4+2],dl
mov [dmsy3+2],dl
mov [dmsy4+2],dl
aret: ret
SECTION .rtext progbits alloc exec write align=64
GLOBAL @R_DrawSpanP_ASM@0
GLOBAL _R_DrawSpanP_ASM
GLOBAL R_DrawSpanP_ASM
; eax: scratch
; ebx: zero
; ecx: yfrac at top end, xfrac int part at low end
; edx: xfrac frac part at top end
; edi: dest
; ebp: scratch
; esi: count
align 16
@R_DrawSpanP_ASM@0:
_R_DrawSpanP_ASM:
R_DrawSpanP_ASM:
mov eax,[ds_x2]
mov ecx,[ds_x1]
sub eax,ecx
jl aret ; count < 0: nothing to do, so leave
push ebx
push edi
push ebp
push esi
mov edi,ecx
add edi,[dc_destorg]
mov ecx,[ds_y]
add edi,[ylookup+ecx*4]
mov edx,[ds_xstep]
dsy1: shl edx,6
mov ebp,[ds_xstep]
dsy3: shr ebp,26
xor ebx,ebx
lea esi,[eax+1]
mov [ds_xstep],edx
mov edx,[ds_ystep]
mov ecx,[ds_xfrac]
dsy4: shr ecx,26
dsm8: and edx,0xffffffc0
or ebp,edx
mov [ds_ystep],ebp
mov ebp,[ds_yfrac]
mov edx,[ds_xfrac]
dsy2: shl edx,6
dsm9: and ebp,0xffffffc0
or ecx,ebp
shr esi,1
jnc dseven1
; do odd pixel
mov ebp,ecx
dsx1: rol ebp,6
dsm1: and ebp,0xfff
add edx,[ds_xstep]
adc ecx,[ds_ystep]
spreada mov bl,[ebp+SPACEFILLER4]
spmapa mov bl,[ebx+SPACEFILLER4]
mov [edi],bl
inc edi
dseven1 shr esi,1
jnc dsrest
; do two more pixels
mov ebp,ecx
add edx,[ds_xstep]
adc ecx,[ds_ystep]
dsm2: and ebp,0xfc00003f
dsx2: rol ebp,6
mov eax,ecx
add edx,[ds_xstep]
adc ecx,[ds_ystep]
spreadb mov bl,[ebp+SPACEFILLER4] ;read texel1
dsx3: rol eax,6
dsm6: and eax,0xfff
spmapb mov bl,[ebx+SPACEFILLER4] ;map texel1
mov [edi],bl ;store texel1
add edi,2
spreadc mov bl,[eax+SPACEFILLER4] ;read texel2
spmapc mov bl,[ebx+SPACEFILLER4] ;map texel2
mov [edi-1],bl ;store texel2
; do the rest
dsrest test esi,esi
jz near dsdone
align 16
dsloop mov ebp,ecx
spstep1d add edx,[ds_xstep]
spstep2d adc ecx,[ds_ystep]
dsm3: and ebp,0xfc00003f
dsx4: rol ebp,6
mov eax,ecx
spstep1e add edx,[ds_xstep]
spstep2e adc ecx,[ds_ystep]
spreadd mov bl,[ebp+SPACEFILLER4] ;read texel1
dsx5: rol eax,6
dsm5: and eax,0xfff
spmapd mov bl,[ebx+SPACEFILLER4] ;map texel1
mov [edi],bl ;store texel1
mov ebp,ecx
spreade mov bl,[eax+SPACEFILLER4] ;read texel2
spstep1f add edx,[ds_xstep]
spstep2f adc ecx,[ds_ystep]
dsm4: and ebp,0xfc00003f
dsx6: rol ebp,6
spmape mov bl,[ebx+SPACEFILLER4] ;map texel2
mov eax,ecx
mov [edi+1],bl ;store texel2
spreadf mov bl,[ebp+SPACEFILLER4] ;read texel3
spmapf mov bl,[ebx+SPACEFILLER4] ;map texel3
add edi,4
dsx7: rol eax,6
dsm7: and eax,0xfff
mov [edi-2],bl ;store texel3
spreadg mov bl,[eax+SPACEFILLER4] ;read texel4
spstep1g add edx,[ds_xstep]
spstep2g adc ecx,[ds_ystep]
spmapg mov bl,[ebx+SPACEFILLER4] ;map texel4
dec esi
mov [edi-1],bl ;store texel4
jnz near dsloop
dsdone pop esi
pop ebp
pop edi
pop ebx
rdspret ret
; This is the same as the previous routine, except it doesn't draw pixels
; where the texture's color value is 0.
GLOBAL @R_DrawSpanMaskedP_ASM@0
GLOBAL _R_DrawSpanMaskedP_ASM
GLOBAL R_DrawSpanMaskedP_ASM
; eax: scratch
; ebx: zero
; ecx: yfrac at top end, xfrac int part at low end
; edx: xfrac frac part at top end
; edi: dest
; ebp: scratch
; esi: count
align 16
@R_DrawSpanMaskedP_ASM@0:
_R_DrawSpanMaskedP_ASM:
R_DrawSpanMaskedP_ASM:
mov eax,[ds_x2]
mov ecx,[ds_x1]
sub eax,ecx
jl rdspret ; count < 0: nothing to do, so leave
push ebx
push edi
push ebp
push esi
mov edi,ecx
add edi,[dc_destorg]
mov ecx,[ds_y]
add edi,[ylookup+ecx*4]
mov edx,[ds_xstep]
dmsy1: shl edx,6
mov ebp,[ds_xstep]
dmsy3: shr ebp,26
xor ebx,ebx
lea esi,[eax+1]
mov [ds_xstep],edx
mov edx,[ds_ystep]
mov ecx,[ds_xfrac]
dmsy4: shr ecx,26
dmsm8: and edx,0xffffffc0
or ebp,edx
mov [ds_ystep],ebp
mov ebp,[ds_yfrac]
mov edx,[ds_xfrac]
dmsy2: shl edx,6
dmsm9: and ebp,0xffffffc0
or ecx,ebp
shr esi,1
jnc dmseven1
; do odd pixel
mov ebp,ecx
dmsx1: rol ebp,6
dmsm1: and ebp,0xfff
add edx,[ds_xstep]
adc ecx,[ds_ystep]
mspreada mov bl,[ebp+SPACEFILLER4]
cmp bl,0
je mspskipa
mspmapa mov bl,[ebx+SPACEFILLER4]
mov [edi],bl
mspskipa: inc edi
dmseven1 shr esi,1
jnc dmsrest
; do two more pixels
mov ebp,ecx
add edx,[ds_xstep]
adc ecx,[ds_ystep]
dmsm2: and ebp,0xfc00003f
dmsx2: rol ebp,6
mov eax,ecx
add edx,[ds_xstep]
adc ecx,[ds_ystep]
mspreadb mov bl,[ebp+SPACEFILLER4] ;read texel1
dmsx3: rol eax,6
dmsm6: and eax,0xfff
cmp bl,0
je mspskipb
mspmapb mov bl,[ebx+SPACEFILLER4] ;map texel1
mov [edi],bl ;store texel1
mspskipb add edi,2
mspreadc mov bl,[eax+SPACEFILLER4] ;read texel2
cmp bl,0
je dmsrest
mspmapc mov bl,[ebx+SPACEFILLER4] ;map texel2
mov [edi-1],bl ;store texel2
; do the rest
dmsrest test esi,esi
jz near dmsdone
align 16
dmsloop mov ebp,ecx
mspstep1d add edx,[ds_xstep]
mspstep2d adc ecx,[ds_ystep]
dmsm3: and ebp,0xfc00003f
dmsx4: rol ebp,6
mov eax,ecx
mspstep1e add edx,[ds_xstep]
mspstep2e adc ecx,[ds_ystep]
mspreadd mov bl,[ebp+SPACEFILLER4] ;read texel1
dmsx5: rol eax,6
dmsm5: and eax,0xfff
cmp bl,0
mov ebp,ecx
je mspreade
mspmapd mov bl,[ebx+SPACEFILLER4] ;map texel1
mov [edi],bl ;store texel1
mspreade mov bl,[eax+SPACEFILLER4] ;read texel2
mspstep1f add edx,[ds_xstep]
mspstep2f adc ecx,[ds_ystep]
dmsm4: and ebp,0xfc00003f
dmsx6: rol ebp,6
cmp bl,0
mov eax,ecx
je mspreadf
mspmape mov bl,[ebx+SPACEFILLER4] ;map texel2
mov [edi+1],bl ;store texel2
mspreadf mov bl,[ebp+SPACEFILLER4] ;read texel3
add edi,4
dmsx7: rol eax,6
dmsm7: and eax,0xfff
cmp bl,0
je mspreadg
mspmapf mov bl,[ebx+SPACEFILLER4] ;map texel3
mov [edi-2],bl ;store texel3
mspreadg mov bl,[eax+SPACEFILLER4] ;read texel4
mspstep1g add edx,[ds_xstep]
mspstep2g adc ecx,[ds_ystep]
cmp bl,0
je mspskipg
mspmapg mov bl,[ebx+SPACEFILLER4] ;map texel4
mov [edi-1],bl ;store texel4
mspskipg dec esi
jnz near dmsloop
dmsdone pop esi
pop ebp
pop edi
pop ebx
ret
;*----------------------------------------------------------------------
;*
;* R_DrawColumnP
;*
;*----------------------------------------------------------------------
GLOBAL @R_DrawColumnP_ASM@0
GLOBAL _R_DrawColumnP_ASM
GLOBAL R_DrawColumnP_ASM
align 16
R_DrawColumnP_ASM:
_R_DrawColumnP_ASM:
@R_DrawColumnP_ASM@0:
; count = dc_yh - dc_yl;
mov ecx,[dc_count]
test ecx,ecx
jle near rdcpret ; count <= 0: nothing to do, so leave
push ebp ; save registers
push ebx
push edi
push esi
; dest = ylookup[dc_yl] + dc_x + dc_destorg;
mov edi,[dc_dest]
mov ebp,ecx
mov ebx,[dc_texturefrac] ; ebx = frac
rdcp1: sub edi,SPACEFILLER4
mov ecx,ebx
shr ecx,16
mov esi,[dc_source]
mov edx,[dc_iscale]
mov eax,[dc_colormap]
cmp BYTE [CPU+66],byte 5
jg rdcploop2
; need 12 bytes of filler to make it aligned
db 0x8D,0x80,0,0,0,0 ; lea eax,[eax+00000000]
db 0x8D,0xBF,0,0,0,0 ; lea edi,[edi+00000000]
align 16
; The registers should now look like this:
;
; [31 .. 16][15 .. 8][7 .. 0]
; eax [colormap ]
; ebx [yi ][yf ]
; ecx [scratch ]
; edx [dyi ][dyf ]
; esi [source texture column ]
; edi [destination screen pointer ]
; ebp [counter ]
;
; Note the partial register stalls on anything better than a Pentium
; That's why there are two versions of this loop.
rdcploop:
mov cl,[esi+ecx] ; Fetch texel
xor ch,ch
add ebx,edx ; increment frac
rdcp2: add edi,SPACEFILLER4 ; increment destination pointer
mov cl,[eax+ecx] ; colormap texel
mov [edi],cl ; Store texel
mov ecx,ebx
shr ecx,16
dec ebp
jnz rdcploop ; loop
pop esi
pop edi
pop ebx
pop ebp
rdcpret:
ret
align 16
rdcploop2:
movzx ecx,byte [esi+ecx] ; Fetch texel
add ebx,edx ; increment frac
mov cl,[eax+ecx] ; colormap texel
rdcp3: add edi,SPACEFILLER4 ; increment destination pointer
mov [edi],cl ; Store texel
mov ecx,ebx
shr ecx,16
dec ebp
jnz rdcploop2 ; loop
pop esi
pop edi
pop ebx
pop ebp
ret
;*----------------------------------------------------------------------
;*
;* R_DrawFuzzColumnP
;*
;*----------------------------------------------------------------------
GLOBAL @R_DrawFuzzColumnP_ASM@0
GLOBAL _R_DrawFuzzColumnP_ASM
GLOBAL R_DrawFuzzColumnP_ASM
align 16
R_DrawFuzzColumnP_ASM:
_R_DrawFuzzColumnP_ASM:
@R_DrawFuzzColumnP_ASM@0:
; Adjust borders. Low...
mov eax,[dc_yl]
push ebx
push esi
push edi
push ebp
cmp eax,0
jg .ylok
mov eax,1
nop
; ...and high.
.ylok mov edx,[fuzzviewheight]
mov esi,[dc_yh]
cmp esi,edx
jle .yhok
mov esi,edx
nop
.yhok mov edx,[dc_x]
sub esi,eax ; esi = count
js near .dfcdone ; Zero length (or less)
mov edi,[ylookup+eax*4]
mov ebx,edx
add edi,[dc_destorg]
mov eax,[NormalLight]
mov ecx,[fuzzpos]
add edi,ebx
add eax,256*6
inc esi
mov ebp,[dc_pitch]
mov edx,FUZZTABLE
test ecx,ecx
je .fuzz0
;
; esi = count
; edi = dest
; ecx = fuzzpos
; eax = colormap 6
;
; first loop: end with fuzzpos or count 0, whichever happens first
sub edx,ecx ; edx = # of entries left in fuzzoffset
mov ebx,esi
cmp esi,edx
jle .enuf
mov esi,edx
.enuf sub ebx,esi
mov edx,[fuzzoffset+ecx*4]
push ebx
xor ebx,ebx
.loop1 inc ecx
mov bl,[edi+edx]
dec esi
mov bl,[eax+ebx]
mov [edi],bl
lea edi,[edi+ebp]
mov edx,[fuzzoffset+ecx*4]
jnz .loop1
; second loop: Chunk it into groups of FUZZTABLE-sized spans and do those
pop esi
cmp ecx,FUZZTABLE
jl .savefuzzpos
xor ecx,ecx
nop
.fuzz0 cmp esi,FUZZTABLE
jl .chunked
.oloop lea edx,[esi-FUZZTABLE]
mov esi,FUZZTABLE
push edx
mov edx,[fuzzoffset+ecx*4]
.iloop inc ecx
mov bl,[edi+edx]
dec esi
mov bl,[eax+ebx]
mov [edi],bl
lea edi,[edi+ebp]
mov edx,[fuzzoffset+ecx*4]
jnz .iloop
pop esi
xor ecx,ecx
cmp esi,FUZZTABLE
jge .oloop
; third loop: Do whatever is left
.chunked
test esi,esi
jle .savefuzzpos
mov edx,[fuzzoffset+ecx*4]
nop
.loop3 inc ecx
mov bl,[edi+edx]
dec esi
mov bl,[eax+ebx]
mov [edi],bl
lea edi,[edi+ebp]
mov edx,[fuzzoffset+ecx*4]
jnz .loop3
.savefuzzpos:
mov [fuzzpos],ecx
.dfcdone:
pop ebp
pop edi
pop esi
pop ebx
ret
;*----------------------------------------------------------------------
;*
;* R_DrawColumnHorizP_ASM
;*
;*----------------------------------------------------------------------
GLOBAL @R_DrawColumnHorizP_ASM@0
GLOBAL _R_DrawColumnHorizP_ASM
GLOBAL R_DrawColumnHorizP_ASM
align 16
@R_DrawColumnHorizP_ASM@0:
R_DrawColumnHorizP_ASM:
_R_DrawColumnHorizP_ASM:
; count = dc_yh - dc_yl;
mov eax,[dc_yh]
mov ecx,[dc_yl]
sub eax,ecx
mov edx,[dc_x]
jl near .leave ; count < 0: nothing to do, so leave
push ebp ; save registers
push ebx
push edi
push esi
inc eax ; make 0 count mean 0 pixels
and edx,3
push eax
mov esi,[dc_ctspan+edx*4]
lea eax,[dc_temp+ecx*4+edx] ; eax = top of column in buffer
mov ebp,[dc_yh]
mov [esi],ecx
mov [esi+4],ebp
add esi,8
mov edi,[dc_source]
mov [dc_ctspan+edx*4],esi
mov esi,[dc_iscale]
mov ecx,[dc_texturefrac] ; ecx = frac
mov dl,[edi] ; load cache
mov ebx,[esp]
and ebx,0xfffffff8
jnz .mthan8
; Register usage in the following code is:
;
; eax: dest
; edi: source
; ecx: frac (16.16)
; esi: fracstep (16.16)
; ebx: add1
; ebp: add2
; dl: texel1
; dh: texel2
;[esp] count
; there are fewer than 8 pixels to draw
mov ebx,[esp]
.lthan8 shr ebx,1
jnc .even
; do one pixel before loop (little opportunity for pairing)
mov ebp,ecx ; copy frac to ebx
add ecx,esi ; increment frac
shr ebp,16 ; shift frac over to low end
add eax,4
mov dl,[edi+ebp]
mov [eax-4],dl
.even test ebx,ebx
jz near .done
.loop2 mov [esp],ebx ; save counter
mov ebx,ecx ; copy frac for texel1 to ebx
shr ebx,16 ; shift frac for texel1 to low end
add ecx,esi ; increment frac
mov ebp,ecx ; copy frac for texel2 to ebp
shr ebp,16 ; shift frac for texel2 to low end
add ecx,esi ; increment frac
mov dl,[edi+ebx] ; read texel1
mov ebx,[esp] ; fetch counter
mov dh,[edi+ebp] ; read texel2
mov [eax],dl ; write texel1
mov [eax+4],dh ; write texel2
add eax,8 ; increment dest
dec ebx ; decrement counter
jnz .loop2 ; loop until it hits 0
jmp .done
; there are more than 8 pixels to draw. position eax as close to a 32 byte
; boundary as possible, then do whatever is left.
.mthan8 test eax,4
jz .try2
mov ebp,ecx ; frac: in ebp
add ecx,esi ; step
shr ebp,16 ; frac: shift
add eax,4 ; increment dest
mov ebx,[esp] ; fetch counter
mov dl,[edi+ebp] ; tex: read
dec ebx ; decrement counter
mov [eax-4],dl ; tex: write
mov [esp],ebx ; store counter
.try2 test eax,8
jz .try4
mov ebx,ecx ; frac1: in ebx
add ecx,esi ; step
shr ebx,16 ; frac1: shift
mov ebp,ecx ; frac2: in ebp
shr ebp,16 ; frac2: shift
add ecx,esi ; step
mov dl,[edi+ebx] ; tex1: read
mov ebx,[esp] ; fetch counter
mov dh,[edi+ebp] ; tex2: read
mov [eax],dl ; tex1: write
mov [eax+4],dh ; tex2: write
sub ebx,2 ; decrement counter
add eax,8 ; increment dest
mov [esp],ebx ; store counter
.try4 test eax,16
jz .try8
mov ebx,ecx ; frac1: in ebx
add ecx,esi ; step
shr ebx,16 ; frac1: shift
mov ebp,ecx ; frac2: in ebp
shr ebp,16 ; frac2: shift
add ecx,esi ; step
mov dl,[edi+ebx] ; tex1: read
mov ebx,ecx ; frac3: in ebx
shr ebx,16 ; frac3: shift
mov dh,[edi+ebp] ; tex2: read
add ecx,esi ; step
mov [eax],dl ; tex1: write
mov [eax+4],dh ; tex2: write
mov ebp,ecx ; frac4: in ebp
shr ebp,16 ; frac4: shift
add ecx,esi ; step
mov dl,[edi+ebx] ; tex3: read
mov ebx,[esp] ; fetch counter
mov dh,[edi+ebp] ; tex4: read
sub ebx,4 ; decrement counter
mov [esp],ebx ; store counter
mov [eax+8],dl ; tex3: write
mov [eax+12],dh ; tex4: write
add eax,16 ; increment dest
.try8 mov ebx,[esp] ; make counter count groups of 8
sub esp,4
shr ebx,3
jmp .tail8
align 16
.loop8 mov [esp],ebx ; save counter
mov ebx,ecx ; frac1: in ebx
shr ebx,16 ; frac1: shift
add ecx,esi ; step
mov ebp,ecx ; frac2: in ebp
shr ebp,16 ; frac2: shift
add ecx,esi ; step
mov dl,[edi+ebx] ; tex1: read
mov ebx,ecx ; frac3: in ebx
mov dh,[edi+ebp] ; tex2: read
shr ebx,16 ; frac3: shift
add ecx,esi ; step
mov [eax],dl ; tex1: write
mov [eax+4],dh ; tex2: write
mov ebp,ecx ; frac4: in ebp
shr ebp,16 ; frac4: shift
add ecx,esi ; step
mov dl,[edi+ebx] ; tex3: read
mov ebx,ecx ; frac5: in ebx
mov dh,[edi+ebp] ; tex4: read
shr ebx,16 ; frac5: shift
mov [eax+8],dl ; tex3: write
mov [eax+12],dh ; tex4: write
add ecx,esi ; step
mov ebp,ecx ; frac6: in ebp
shr ebp,16 ; frac6: shift
mov dl,[edi+ebx] ; tex5: read
add ecx,esi ; step
mov ebx,ecx ; frac7: in ebx
mov [eax+16],dl ; tex5: write
shr ebx,16 ; frac7: shift
mov dh,[edi+ebp] ; tex6: read
add ecx,esi ; step
mov ebp,ecx ; frac8: in ebp
mov [eax+20],dh ; tex6: write
shr ebp,16 ; frac8: shift
add eax,32 ; increment dest pointer
mov dl,[edi+ebx] ; tex7: read
mov ebx,[esp] ; fetch counter
mov [eax-8],dl ; tex7: write
mov dh,[edi+ebp] ; tex8: read
add ecx,esi ; step
mov [eax-4],dh ; tex8: write
mov dl,[eax] ; load cache
dec ebx ; decrement counter
.tail8 jnz near .loop8 ; loop if more to do
pop ebp
mov ebx,[esp]
and ebx,7
jnz near .lthan8
.done pop eax
pop esi
pop edi
pop ebx
pop ebp
.leave ret
;*----------------------------------------------------------------------
;*
;* rt_copy1col_asm
;*
;* ecx = hx
;* edx = sx
;* [esp+4] = yl
;* [esp+8] = yh
;*
;*----------------------------------------------------------------------
GLOBAL @rt_copy1col_asm@16
GLOBAL _rt_copy1col_asm
GLOBAL rt_copy1col_asm
align 16
rt_copy1col_asm:
_rt_copy1col_asm:
pop eax
mov edx,[esp+4*3]
mov ecx,[esp+4*2]
push edx
push ecx
mov ecx,[esp+4*2]
mov edx,[esp+4*3]
push eax
@rt_copy1col_asm@16:
mov eax, [esp+4]
push ebx
mov ebx, [esp+12]
push esi
sub ebx, eax
push edi
js .done
lea esi,[eax*4]
inc ebx ; ebx = count
mov eax,edx
lea ecx,[dc_temp+ecx+esi] ; ecx = source
mov edi,[ylookup+esi]
mov esi,[dc_pitch] ; esi = pitch
add eax,edi ; eax = dest
add eax,[dc_destorg]
shr ebx,1
jnc .even
mov dl,[ecx]
add ecx,4
mov [eax],dl
add eax,esi
.even and ebx,ebx
jz .done
.loop mov dl,[ecx]
mov dh,[ecx+4]
mov [eax],dl
mov [eax+esi],dh
add ecx,8
lea eax,[eax+esi*2]
dec ebx
jnz .loop
.done pop edi
pop esi
pop ebx
ret 8
;*----------------------------------------------------------------------
;*
;* rt_copy4cols_asm
;*
;* ecx = sx
;* edx = yl
;* [esp+4] = yh
;*
;*----------------------------------------------------------------------
GLOBAL @rt_copy4cols_asm@12
GLOBAL _rt_copy4cols_asm
GLOBAL rt_copy4cols_asm
align 16
rt_copy4cols_asm:
_rt_copy4cols_asm:
pop eax
mov ecx,[esp+8]
mov edx,[esp+4]
push ecx
mov ecx,[esp+4]
push eax
@rt_copy4cols_asm@12:
push ebx
mov ebx,[esp+8]
push esi
sub ebx,edx
push edi
js .done
inc ebx ; ebx = count
mov eax,ecx
mov esi,[ylookup+edx*4]
lea ecx,[dc_temp+edx*4] ; ecx = source
mov edx,[dc_pitch] ; edx = pitch
add eax,esi ; eax = dest
add eax,[dc_destorg]
shr ebx,1
jnc .even
mov esi,[ecx]
add ecx,4
mov [eax],esi
add eax,edx
.even and ebx,ebx
jz .done
.loop mov esi,[ecx]
mov edi,[ecx+4]
mov [eax],esi
mov [eax+edx],edi
add ecx,8
lea eax,[eax+edx*2]
dec ebx
jnz .loop
.done pop edi
pop esi
pop ebx
ret 4
;*----------------------------------------------------------------------
;*
;* rt_map1col_asm
;*
;* ecx = hx
;* edx = sx
;* [esp+4] = yl
;* [esp+8] = yh
;*
;*----------------------------------------------------------------------
GLOBAL @rt_map1col_asm@16
GLOBAL _rt_map1col_asm
GLOBAL rt_map1col_asm
align 16
rt_map1col_asm:
_rt_map1col_asm:
pop eax
mov edx,[esp+4*3]
mov ecx,[esp+4*2]
push edx
push ecx
mov ecx,[esp+4*2]
mov edx,[esp+4*3]
push eax
@rt_map1col_asm@16:
mov eax,[esp+4]
push ebx
mov ebx,[esp+12]
push ebp
push esi
sub ebx, eax
push edi
js .done
lea edi,[eax*4]
mov esi,[dc_colormap] ; esi = colormap
inc ebx ; ebx = count
mov eax,edx
lea ebp,[dc_temp+ecx+edi] ; ebp = source
mov ecx,[ylookup+edi]
mov edi,[dc_pitch] ; edi = pitch
add eax,ecx ; eax = dest
xor ecx,ecx
xor edx,edx
add eax,[dc_destorg]
shr ebx,1
jnc .even
mov dl,[ebp]
add ebp,4
mov dl,[esi+edx]
mov [eax],dl
add eax,edi
.even and ebx,ebx
jz .done
.loop mov dl,[ebp]
mov cl,[ebp+4]
add ebp,8
mov dl,[esi+edx]
mov cl,[esi+ecx]
mov [eax],dl
mov [eax+edi],cl
dec ebx
lea eax,[eax+edi*2]
jnz .loop
.done pop edi
pop esi
pop ebp
pop ebx
ret 8
;*----------------------------------------------------------------------
;*
;* rt_map4cols_asm
;*
;* rt_map4cols_asm1 is for PPro and above
;* rt_map4cols_asm2 is for Pentium and below
;*
;* ecx = sx
;* edx = yl
;* [esp+4] = yh
;*
;*----------------------------------------------------------------------
GLOBAL @rt_map4cols_asm1@12
GLOBAL _rt_map4cols_asm1
GLOBAL rt_map4cols_asm1
align 16
rt_map4cols_asm1:
_rt_map4cols_asm1:
pop eax
mov ecx,[esp+8]
mov edx,[esp+4]
push ecx
mov ecx,[esp+4]
push eax
@rt_map4cols_asm1@12:
push ebx
mov ebx,[esp+8]
push ebp
push esi
sub ebx,edx
push edi
js near .done
mov esi,[dc_colormap] ; esi = colormap
shl edx,2
mov eax,ecx
inc ebx ; ebx = count
mov edi,[ylookup+edx]
lea ebp,[dc_temp+edx] ; ebp = source
add eax,edi ; eax = dest
mov edi,[dc_pitch] ; edi = pitch
add eax,[dc_destorg]
xor ecx,ecx
xor edx,edx
shr ebx,1
jnc .even
mov dl,[ebp]
mov cl,[ebp+1]
add ebp,4
mov dl,[esi+edx]
mov cl,[esi+ecx]
mov [eax],dl
mov [eax+1],cl
mov dl,[ebp-2]
mov cl,[ebp-1]
mov dl,[esi+edx]
mov cl,[esi+ecx]
mov [eax+2],dl
mov [eax+3],cl
add eax,edi
.even and ebx,ebx
jz .done
.loop
mov dl,[ebp]
mov cl,[ebp+1]
add ebp,8
mov dl,[esi+edx]
mov cl,[esi+ecx]
mov [eax],dl
mov [eax+1],cl
mov dl,[ebp-6]
mov cl,[ebp-5]
mov dl,[esi+edx]
mov cl,[esi+ecx]
mov [eax+2],dl
mov [eax+3],cl
mov dl,[ebp-4]
mov cl,[ebp-3]
mov dl,[esi+edx]
mov cl,[esi+ecx]
mov [eax+edi],dl
mov [eax+edi+1],cl
mov dl,[ebp-2]
mov cl,[ebp-1]
mov dl,[esi+edx]
mov cl,[esi+ecx]
mov [eax+edi+2],dl
mov [eax+edi+3],cl
lea eax,[eax+edi*2]
dec ebx
jnz .loop
.done pop edi
pop esi
pop ebp
pop ebx
ret 4
GLOBAL @rt_map4cols_asm2@12
GLOBAL _rt_map4cols_asm2
GLOBAL rt_map4cols_asm2
align 16
rt_map4cols_asm2:
_rt_map4cols_asm2:
pop eax
mov ecx,[esp+8]
mov edx,[esp+4]
push ecx
mov ecx,[esp+4]
push eax
@rt_map4cols_asm2@12:
push ebx
mov ebx,[esp+8]
push ebp
push esi
sub ebx,edx
push edi
js near .done
mov esi,[dc_colormap] ; esi = colormap
shl edx,2
mov eax,ecx
inc ebx ; ebx = count
mov edi,[ylookup+edx]
lea ebp,[dc_temp+edx] ; ebp = source
add eax,edi ; eax = dest
mov edi,[dc_pitch] ; edi = pitch
add eax,[dc_destorg]
xor ecx,ecx
xor edx,edx
shr ebx,1
jnc .even
mov dl,[ebp]
mov cl,[ebp+1]
add ebp,4
mov dl,[esi+edx]
mov cl,[esi+ecx]
mov [eax],dl
mov [eax+1],cl
mov dl,[ebp-2]
mov cl,[ebp-1]
mov dl,[esi+edx]
mov cl,[esi+ecx]
mov [eax+2],dl
mov [eax+3],cl
add eax,edi
.even and ebx,ebx
jz .done
.loop
mov dl,[ebp+3]
mov ch,[esi+edx]
mov dl,[ebp+2]
mov cl,[esi+edx]
shl ecx,16
mov dl,[ebp+1]
mov ch,[esi+edx]
mov dl,[ebp]
mov cl,[esi+edx]
mov [eax],ecx
add eax,edi
mov dl,[ebp+7]
mov ch,[esi+edx]
mov dl,[ebp+6]
mov cl,[esi+edx]
shl ecx,16
mov dl,[ebp+5]
mov ch,[esi+edx]
mov dl,[ebp+4]
mov cl,[esi+edx]
mov [eax],ecx
add eax,edi
add ebp,8
dec ebx
jnz .loop
.done pop edi
pop esi
pop ebp
pop ebx
ret 4
;************************
SECTION .text
EXTERN setvlinebpl_
EXTERN setpitch3
GLOBAL @ASM_PatchPitch@0
GLOBAL _ASM_PatchPitch
GLOBAL ASM_PatchPitch
ASM_PatchPitch:
_ASM_PatchPitch:
@ASM_PatchPitch@0:
mov eax,[dc_pitch]
mov [rdcp1+2],eax
mov [rdcp2+2],eax
mov [rdcp3+2],eax
call setpitch3
jmp setvlinebpl_
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