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;*
;* tmap2.nas
;* The tilted plane inner loop.
;*
;*---------------------------------------------------------------------------
;* Copyright 1998-2005 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.
;*---------------------------------------------------------------------------
;*
;* I tried doing the ROL trick that R_DrawSpanP_ASM uses, and it was
;* actually slightly slower than the more straight-forward approach
;* used here, probably because the trick requires too much setup time.
;*
BITS 32
%define SPACEFILLER4 (0x44444444)
%ifndef M_TARGET_LINUX
%define plane_sz _plane_sz
%define plane_su _plane_su
%define plane_sv _plane_sv
%define plane_shade _plane_shade
%define planelightfloat _planelightfloat
%define spanend _spanend
%define ylookup _ylookup
%define dc_destorg _dc_destorg
%define ds_colormap _ds_colormap
%define ds_source _ds_source
%define centery _centery
%define centerx _centerx
%define ds_curtiltedsource _ds_curtiltedsource
%define pviewx _pviewx
%define pviewy _pviewy
%define tiltlighting _tiltlighting
%define R_DrawTiltedPlane_ASM _R_DrawTiltedPlane_ASM
%define R_SetTiltedSpanSource_ASM _R_SetTiltedSpanSource_ASM
%define R_CalcTiltedLighting _R_CalcTiltedLighting
%endif
EXTERN plane_sz
EXTERN plane_su
EXTERN plane_sv
EXTERN planelightfloat
EXTERN spanend
EXTERN ylookup
EXTERN dc_destorg
EXTERN ds_colormap
EXTERN centery
EXTERN centerx
EXTERN ds_source
EXTERN plane_shade
EXTERN pviewx
EXTERN pviewy
EXTERN tiltlighting
EXTERN R_CalcTiltedLighting
GLOBAL ds_curtiltedsource
%define sv_i plane_sv
%define sv_j plane_sv+4
%define sv_k plane_sv+8
%define su_i plane_su
%define su_j plane_su+4
%define su_k plane_su+8
%define sz_i plane_sz
%define sz_j plane_sz+4
%define sz_k plane_sz+8
%define SPANBITS 3
section .bss
start_u: resq 1
start_v: resq 1
step_u: resq 1
step_v: resq 1
step_iz: resq 1
step_uz: resq 1
step_vz: resq 1
end_z: resd 1
section .data
ds_curtiltedsource: dd SPACEFILLER4
fp_1:
spanrecips: dd 0x3f800000 ; 1/1
dd 0x3f000000 ; 1/2
dd 0x3eaaaaab ; 1/3
dd 0x3e800000 ; 1/4
dd 0x3e4ccccd ; 1/5
dd 0x3e2aaaab ; 1/6
dd 0x3e124925 ; 1/7
fp_8recip: dd 0x3e000000 ; 1/8
dd 0x3de38e39 ; 1/9
dd 0x3dcccccd ; 1/10
dd 0x3dba2e8c ; 1/11
dd 0x3daaaaab ; 1/12
dd 0x3d9d89d9 ; 1/13
dd 0x3d924925 ; 1/14
dd 0x3d888889 ; 1/15
fp_quickint: dd 0x3f800000 ; 1
dd 0x40000000 ; 2
dd 0x40400000 ; 3
dd 0x40800000 ; 4
dd 0x40a00000 ; 5
dd 0x40c00000 ; 6
dd 0x40e00000 ; 7
fp_8: dd 0x41000000 ; 8
section .text
GLOBAL R_SetTiltedSpanSource_ASM
GLOBAL @R_SetTiltedSpanSource_ASM@4
R_SetTiltedSpanSource_ASM:
mov ecx,[esp+4]
@R_SetTiltedSpanSource_ASM@4:
mov [fetch1+3],ecx
mov [fetch2+3],ecx
mov [fetch3+3],ecx
mov [fetch4+3],ecx
mov [fetch5+3],ecx
mov [fetch6+3],ecx
mov [fetch7+3],ecx
mov [fetch8+3],ecx
mov [fetch9+3],ecx
mov [fetch10+3],ecx
mov [ds_curtiltedsource],ecx
ret
GLOBAL SetTiltedSpanSize
SetTiltedSpanSize:
push ecx
mov cl,dl
neg cl
mov eax,1
shl eax,cl
mov cl,[esp]
neg cl
mov [x1+2],cl
mov [x2+2],cl
mov [x3+2],cl
mov [x4+2],cl
mov [x5+2],cl
mov [x6+2],cl
mov [x7+2],cl
mov [x8+2],cl
mov [x9+2],cl
mov [x10+2],cl
sub cl,dl
dec eax
mov [y1+2],cl
mov [y2+2],cl
mov [y3+2],cl
mov [y4+2],cl
mov [y5+2],cl
mov [y6+2],cl
mov [y7+2],cl
mov [y8+2],cl
mov [y9+2],cl
mov [y10+2],cl
not eax
pop ecx
mov [m1+2],eax
mov [m2+2],eax
mov [m3+2],eax
mov [m4+2],eax
mov [m5+2],eax
mov [m6+2],eax
mov [m7+2],eax
mov [m8+2],eax
mov [m9+2],eax
mov [m10+2],eax
ret
SECTION .rtext progbits alloc exec write align=64
GLOBAL R_DrawTiltedPlane_ASM
GLOBAL @R_DrawTiltedPlane_ASM@8
R_DrawTiltedPlane_ASM:
mov ecx,[esp+4]
mov edx,[esp+8]
; ecx = y
; edx = x
@R_DrawTiltedPlane_ASM@8:
push ebx
push esi
push edi
push ebp
mov eax,[centery]
movzx ebx,word [spanend+ecx*2]
sub eax,ecx ; eax = centery-y
sub ebx,edx ; ebx = span length - 1
mov edi,[ylookup+ecx*4]
push eax
add edi,[dc_destorg]
add edi,edx ; edi = frame buffer pointer
sub edx,[centerx] ; edx = x-centerx
push edx
xor eax,eax
fild dword [esp+4] ; ymul
fild dword [esp] ; xmul | ymul
fld dword [sv_j] ; sv.j | xmul | ymul
fmul st0,st2 ; sv.j*ymul | xmul | ymul
fld dword [su_j] ; su.j | sv.j*ymul | xmul | ymul
fmul st0,st3 ; su.j*ymul | sv.j*ymul | xmul | ymul
fld dword [sz_j] ; sz.j | su.j*ymul | sv.j*ymul | xmul | ymul
fmulp st4,st0 ; su.j*ymul | sv.j*ymul | xmul | sz.j*ymul
fld dword [sv_i] ; sv.i | su.j*ymul | sv.j*ymul | xmul | sz.j*ymul
fmul st0,st3 ; sv.i*xmul | su.j*ymul | sv.j*ymul | xmul | sz.j*ymul
fld dword [su_i] ; su.i | sv.i*xmul | su.j*ymul | sv.j*ymul | xmul | sz.j*ymul
fmul st0,st4 ; su.i*xmul | sv.i*xmul | su.j*ymul | sv.j*ymul | xmul | sz.j*ymul
fld dword [sz_i] ; sz.i | su.i*xmul | sv.i*xmul | su.j*ymul | sv.j*ymul | xmul | sz.j*ymul
fmulp st5,st0 ; su.i*xmul | sv.i*xmul | su.j*ymul | sv.j*ymul | sz.i*xmul | sz.j*ymul
fxch st1 ; sv.i*xmul | su.i*xmul | su.j*ymul | sv.j*ymul | sz.i*xmul | sz.j*ymul
faddp st3,st0 ; su.i*xmul | su.j*ymul | sv.i*xmul+sv.j*ymul | sz.i*xmul | sz.j*ymul
faddp st1,st0 ; su.i*xmul+su.j*ymul | sv.i*xmul+sv.j*ymul | sz.i*xmul | sz.j*ymul
fxch st3 ; sz.j*ymul | sv.i*xmul+sv.j*ymul | sz.i*xmul | su.i*xmul+su.j*ymul
faddp st2,st0 ; sv.i*xmul+sv.j*ymul | sz.i*xmul+sz.j*ymul | su.i*xmul+su.j*ymul
fadd dword [sv_k] ; v/z | sz.i*xmul+sz.j*ymul | su.i*xmul+su.j*ymul
fxch st1 ; sz.i*xmul+sz.j*ymul | v/z | su.i*xmul+su.j*ymul
fadd dword [sz_k] ; 1/z | v/z | su.i*xmul+su.j*ymul
fxch st2 ; su.i*xmul+su.j*ymul | v/z | 1/z
fadd dword [su_k] ; u/z | v/z | 1/z
fxch st2 ; 1/z | v/z | u/z
fxch st1 ; v/z | 1/z | u/z
; if lighting is on, fill out the light table
mov al,[plane_shade]
test al,al
jz .litup
push ebx
fild dword [esp] ; width | v/z | 1/z | u/z
fmul dword [sz_i] ; width*sz.i | v/z | 1/z | u/z
fadd st0,st2 ; 1/endz | v/z | 1/z | u/z
fld st2 ; 1/z | 1/endz | v/z | 1/z | u/z
fmul dword [planelightfloat]
fxch st1
fmul dword [planelightfloat]
sub esp,8
fistp dword [esp]
fistp dword [esp+4]
call R_CalcTiltedLighting
add esp, 12
xor eax, eax
.litup add esp, 8
; calculate initial z, u, and v values
fld st1 ; 1/z | v/z | 1/z | u/z
fdivr dword [fp_1] ; z | v/z | 1/z | u/z
fld st3 ; u/z | z | v/z | 1/z | u/z
fmul st0,st1 ; u | z | v/z | 1/z | u/z
fld st2 ; v/z | u | z | v/z | 1/z | u/z
fmulp st2,st0 ; u | v | v/z | 1/z | u/z
fld st0
fistp qword [start_u]
fld st1
fistp qword [start_v]
cmp ebx,7 ; Do we have at least 8 pixels to plot?
jl near ShortStrip
; yes, we do, so figure out tex coords at end of this span
; multiply i values by span length (8)
fld dword [su_i] ; su.i
fmul dword [fp_8] ; su.i*8
fld dword [sv_i] ; sv.i | su.i*8
fmul dword [fp_8] ; sv.i*8 | su.i*8
fld dword [sz_i] ; sz.i | sv.i*8 | su.i*8
fmul dword [fp_8] ; sz.i*8 | sv.i*8 | su.i*8
fxch st2 ; su.i*8 | sv.i*8 | sz.i*8
fstp qword [step_uz] ; sv.i*8 | sz.i*8
fstp qword [step_vz] ; sz.i*8
fst qword [step_iz] ; sz.i*8
; find tex coords at start of next span
faddp st4
fld qword [step_vz]
faddp st3
fld qword [step_uz]
faddp st5
fld st3 ; 1/z | u | v | v/z | 1/z | u/z
fdivr dword [fp_1] ; z | u | v | v/z | 1/z | u/z
fst dword [end_z]
fld st5 ; u/z | z | u | v | v/z | 1/z | u/z
fmul st0,st1 ; u' | z | u | v | v/z | 1/z | u/z
fxch st1 ; z | u' | u | v | v/z | 1/z | u/z
fmul st0,st4 ; v' | u' | u | v | v/z | 1/z | u/z
fxch st3 ; v | u' | u | v' | v/z | 1/z | u/z
; now subtract to get stepping values for this span
fsubr st0,st3 ; v'-v | u' | u | v' | v/z | 1/z | u/z
fxch st2 ; u | u' | v'-v | v' | v/z | 1/z | u/z
fsubr st0,st1 ; u'-u | u' | v'-v | v' | v/z | 1/z | u/z
fxch st2 ; v'-v | u' | u'-u | v' | v/z | 1/z | u/z
fmul dword [fp_8recip] ; vstep | u' | u'-u | v' | v/z | 1/z | u/z
fxch st1 ; u' | vstep | u'-u | v' | v/z | 1/z | u/z
fxch st2 ; u'-u | vstep | u' | v' | v/z | 1/z | u/z
fmul dword [fp_8recip] ; ustep | vstep | u' | v' | v/z | 1/z | u/z
fxch st1 ; vstep | ustep | u' | v' | v/z | 1/z | u/z
fistp qword [step_v] ; ustep | u' | v' | v/z | 1/z | u/z
fistp qword [step_u] ; u | v | v/z | 1/z | u/z
FullSpan:
xor eax,eax
cmp ebx,15 ; is there another complete span after this one?
jl NextIsShort
; there is a complete span after this one
fld qword [step_iz]
faddp st4,st0
fld qword [step_vz]
faddp st3,st0
fld qword [step_uz]
faddp st5,st0
jmp StartDiv
NextIsShort:
cmp ebx,8 ; if next span is no more than 1 pixel, then we already
jle DrawFullSpan ; know everything we need to draw it
fld dword [sz_i] ; sz.i | u | v | v/z | 1/z | u/z
fmul dword [fp_quickint-8*4+ebx*4]
fld dword [sv_i] ; sv.i | sz.i | u | v | v/z | 1/z | u/z
fmul dword [fp_quickint-8*4+ebx*4]
fld dword [su_i] ; su.i | sv.i | sz.i | u | v | v/z | 1/z | u/z
fmul dword [fp_quickint-8*4+ebx*4]
fxch st2 ; sz.i | sv.i | su.i | u | v | v/z | 1/z | u/z
faddp st6,st0 ; sv.i | su.i | u | v | v/z | 1/z | u/z
faddp st4,st0 ; su.i | u | v | v/z | 1/z | u/z
faddp st5,st0 ; u | v | v/z | 1/z | u/z
StartDiv:
fld st3 ; 1/z | u | v | v/z | 1/z | u/z
fdivr dword [fp_1] ; z | u | v | v/z | 1/z | u/z
DrawFullSpan
mov ecx,[start_v]
mov edx,[start_u]
add ecx,[pviewy]
add edx,[pviewx]
mov esi,edx
mov ebp,ecx
x1 shr ebp,26
m1 and esi,0xfc000000
y1 shr esi,20
add ecx,[step_v]
add edx,[step_u]
fetch1 mov al,[ebp+esi+SPACEFILLER4]
mov ebp,[tiltlighting+ebx*4]
mov esi,edx
mov al,[ebp+eax]
mov ebp,ecx
mov [edi+0],al
x2 shr ebp,26
m2 and esi,0xfc000000
y2 shr esi,20
add ecx,[step_v]
add edx,[step_u]
fetch2 mov al,[ebp+esi+SPACEFILLER4]
mov ebp,[tiltlighting+ebx*4-4]
mov esi,edx
mov al,[ebp+eax]
mov ebp,ecx
mov [edi+1],al
x3 shr ebp,26
m3 and esi,0xfc000000
y3 shr esi,20
add ecx,[step_v]
add edx,[step_u]
fetch3 mov al,[ebp+esi+SPACEFILLER4]
mov ebp,[tiltlighting+ebx*4-8]
mov esi,edx
mov al,[ebp+eax]
mov ebp,ecx
mov [edi+2],al
x4 shr ebp,26
m4 and esi,0xfc000000
y4 shr esi,20
add ecx,[step_v]
add edx,[step_u]
fetch4 mov al,[ebp+esi+SPACEFILLER4]
mov ebp,[tiltlighting+ebx*4-12]
mov esi,edx
mov al,[ebp+eax]
mov ebp,ecx
mov [edi+3],al
x5 shr ebp,26
m5 and esi,0xfc000000
y5 shr esi,20
add ecx,[step_v]
add edx,[step_u]
fetch5 mov al,[ebp+esi+SPACEFILLER4]
mov ebp,[tiltlighting+ebx*4-16]
mov esi,edx
mov al,[ebp+eax]
mov ebp,ecx
mov [edi+4],al
x6 shr ebp,26
m6 and esi,0xfc000000
y6 shr esi,20
add ecx,[step_v]
add edx,[step_u]
fetch6 mov al,[ebp+esi+SPACEFILLER4]
mov ebp,[tiltlighting+ebx*4-20]
mov esi,edx
mov al,[ebp+eax]
mov ebp,ecx
mov [edi+5],al
x7 shr ebp,26
m7 and esi,0xfc000000
y7 shr esi,20
add ecx,[step_v]
add edx,[step_u]
fetch7 mov al,[ebp+esi+SPACEFILLER4]
mov ebp,[tiltlighting+ebx*4-24]
x8 shr ecx,26
mov al,[ebp+eax]
m8 and edx,0xfc000000
mov [edi+6],al
y8 shr edx,20
mov ebp,[tiltlighting+ebx*4-28]
fetch8 mov al,[edx+ecx+SPACEFILLER4]
mov al,[ebp+eax]
mov [edi+7],al
add edi,8
sub ebx,8
jl near Done
fld st1
fistp qword [start_u]
fld st2
fistp qword [start_v]
cmp ebx,7
jl near EndIsShort
fst dword [end_z]
fld st5 ; u/z | z | u | v | v/z | 1/z | u/z
fmul st0,st1 ; u' | z | u | v | v/z | 1/z | u/z
fxch st1 ; z | u' | u | v | v/z | 1/z | u/z
fmul st0,st4 ; v' | u' | u | v | v/z | 1/z | u/z
fxch st3 ; v | u' | u | v' | v/z | 1/z | u/z
fsubr st0,st3 ; v'-v | u' | u | v' | v/z | 1/z | u/z
fxch st2 ; u | u' | v'-v | v' | v/z | 1/z | u/z
fsubr st0,st1 ; u'-u | u' | v'-v | v' | v/z | 1/z | u/z
fxch st2 ; v'-v | u' | u'-u | v' | v/z | 1/z | u/z
fmul dword [fp_8recip] ; vstep | u' | u'-u | v' | v/z | 1/z | u/z
fxch st1 ; u' | vstep | u'-u | v' | v/z | 1/z | u/z
fxch st2 ; u'-u | vstep | u' | v' | v/z | 1/z | u/z
fmul dword [fp_8recip] ; ustep | vstep | u' | v' | v/z | 1/z | u/z
fxch st1 ; vstep | ustep | u' | v' | v/z | 1/z | u/z
fistp qword [step_v] ; ustep | u' | v' | v/z | 1/z | u/z
fistp qword [step_u] ; u | v | v/z | 1/z | u/z
jmp FullSpan
OnlyOnePixelAtEnd:
fld st0
fistp qword [start_u]
fld st1
fistp qword [start_v]
OnlyOnePixel:
mov edx,[start_v]
mov ecx,[start_u]
add edx,[pviewy]
add ecx,[pviewx]
x9 shr edx,26
m9 and ecx,0xfc000000
y9 shr ecx,20
mov ebp,[tiltlighting]
fetch9 mov al,[ecx+edx+SPACEFILLER4]
mov al,[ebp+eax]
mov [edi],al
Done:
fcompp
fcompp
fstp st0
pop ebp
pop edi
pop esi
pop ebx
ret
ShortStrip:
cmp ebx,0
jle near OnlyOnePixel
MoreThanOnePixel:
fld dword [sz_i] ; sz.i | u | v | v/z | 1/z | u/z
fmul dword [fp_quickint+ebx*4]
fld dword [sv_i] ; sv.i | sz.i | u | v | v/z | 1/z | u/z
fmul dword [fp_quickint+ebx*4]
fld dword [su_i] ; su.i | sv.i | sz.i | u | v | v/z | 1/z | u/z
fmul dword [fp_quickint+ebx*4]
fxch st2 ; sz.i | sv.i | su.i | u | v | v/z | 1/z | u/z
faddp st6,st0 ; sv.i | su.i | u | v | v/z | 1/z | u/z
faddp st4,st0 ; su.i | u | v | v/z | 1/z | u/z
faddp st5,st0 ; u | v | v/z | 1/z | u/z
fld st3 ; 1/z | u | v | v/z | 1/z | u/z
fdivr dword [fp_1] ; z | u | v | v/z | 1/z | u/z
jmp CalcPartialSteps
EndIsShort:
cmp ebx,0
je near OnlyOnePixelAtEnd
CalcPartialSteps:
fst dword [end_z]
fld st5 ; u/z | z | u | v | v/z | 1/z | u/z
fmul st0,st1 ; u' | z | u | v | v/z | 1/z | u/z
fxch st1 ; z | u' | u | v | v/z | 1/z | u/z
fmul st0,st4 ; v' | u' | u | v | v/z | 1/z | u/z
fxch st1 ; u' | v' | u | v | v/z | 1/z | u/z
fsubrp st2,st0 ; v' | u'-u | v | v/z | 1/z | u/z
fsubrp st2,st0 ; u'-u | v'-v | v/z | 1/z | u/z
fmul dword [spanrecips+ebx*4] ;ustep | v'-v | v/z | 1/z | u/z
fxch st1 ; v'-v | ustep | v/z | 1/z | u/z
fmul dword [spanrecips+ebx*4] ;vstep | ustep | v/z | 1/z | u/z
fxch st1 ; ustep | vstep | v/z | 1/z | u/z
fistp qword [step_u] ; vstep | v/z | 1/z | u/z
fistp qword [step_v] ; v/z | 1/z | u/z
mov ecx,[start_v]
mov edx,[start_u]
add ecx,[pviewy]
add edx,[pviewx]
mov esi,edx
mov ebp,ecx
endloop
x10 shr ebp,26
m10 and esi,0xfc000000
y10 shr esi,20
inc edi
add ecx,[step_v]
add edx,[step_u]
fetch10 mov al,[ebp+esi+SPACEFILLER4]
mov ebp,[tiltlighting+ebx*4]
mov esi,edx
dec ebx
mov al,[ebp+eax]
mov ebp,ecx
mov [edi-1],al
jge endloop
fcompp
fstp st0
pop ebp
pop edi
pop esi
pop ebx
ret
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