stjr/SRB2
0
0
Fork 0
mirror of https://git.do.srb2.org/STJr/SRB2.git synced 2024-12-03 01:32:22 +00:00
Code Issues Projects Releases Packages Wiki Activity
SRB2/src/tmap_mmx.nas
spherallic 1470d099e3 Update copyright year & credits
2023-03-31 14:53:31 +02:00

674 lines
14 KiB
Text
Raw Blame History

;; SONIC ROBO BLAST 2
;;-----------------------------------------------------------------------------
;; Copyright (C) 1998-2000 by DOSDOOM.
;; Copyright (C) 2010-2023 by Sonic Team Junior.
;;
;; This program is free software distributed under the
;; terms of the GNU General Public License, version 2.
;; See the 'LICENSE' file for more details.
;;-----------------------------------------------------------------------------
;; FILE:
;; tmap_mmx.nas
;; DESCRIPTION:
;; Assembler optimised rendering code for software mode, using SIMD
;; instructions.
;; Draw wall columns.
[BITS 32]
%define FRACBITS 16
%define TRANSPARENTPIXEL 255
%ifdef LINUX
%macro cextern 1
[extern %1]
%endmacro
%macro cglobal 1
[global %1]
%endmacro
%else
%macro cextern 1
%define %1 _%1
[extern %1]
%endmacro
%macro cglobal 1
%define %1 _%1
[global %1]
%endmacro
%endif
; The viddef_s structure. We only need the width field.
struc viddef_s
resb 12
.width: resb 4
resb 44
endstruc
;; externs
;; columns
cextern dc_colormap
cextern dc_x
cextern dc_yl
cextern dc_yh
cextern dc_iscale
cextern dc_texturemid
cextern dc_texheight
cextern dc_source
cextern dc_hires
cextern centery
cextern centeryfrac
cextern dc_transmap
cextern R_DrawColumn_8_ASM
cextern R_Draw2sMultiPatchColumn_8_ASM
;; spans
cextern nflatshiftup
cextern nflatxshift
cextern nflatyshift
cextern nflatmask
cextern ds_xfrac
cextern ds_yfrac
cextern ds_xstep
cextern ds_ystep
cextern ds_x1
cextern ds_x2
cextern ds_y
cextern ds_source
cextern ds_colormap
cextern ylookup
cextern columnofs
cextern vid
[SECTION .data]
nflatmask64 dq 0
[SECTION .text]
;;----------------------------------------------------------------------
;;
;; R_DrawColumn : 8bpp column drawer
;;
;; MMX column drawer.
;;
;;----------------------------------------------------------------------
;; eax = accumulator
;; ebx = colormap
;; ecx = count
;; edx = accumulator
;; esi = source
;; edi = dest
;; ebp = vid.width
;; mm0 = accumulator
;; mm1 = heightmask, twice
;; mm2 = 2 * fracstep, twice
;; mm3 = pair of consecutive fracs
;;----------------------------------------------------------------------
cglobal R_DrawColumn_8_MMX
R_DrawColumn_8_MMX:
push ebp ;; preserve caller's stack frame pointer
push esi ;; preserve register variables
push edi
push ebx
;;
;; Our algorithm requires that the texture height be a power of two.
;; If not, fall back to the non-MMX drawer.
;;
.texheightcheck:
mov edx, [dc_texheight]
sub edx, 1 ;; edx = heightmask
test edx, [dc_texheight]
jnz near .usenonMMX
mov ebp, edx ;; Keep a copy of heightmask in a
;; GPR for the time being.
;;
;; Fill mm1 with heightmask
;;
movd mm1, edx ;; low dword = heightmask
punpckldq mm1, mm1 ;; copy low dword to high dword
;;
;; dest = ylookup[dc_yl] + columnofs[dc_x];
;;
mov eax, [dc_yl]
mov edi, [ylookup+eax*4]
mov ebx, [dc_x]
add edi, [columnofs+ebx*4] ;; edi = dest
;;
;; pixelcount = yh - yl + 1
;;
mov ecx, [dc_yh]
add ecx, 1
sub ecx, eax ;; pixel count
jle near .done ;; nothing to scale
;;
;; fracstep = dc_iscale;
;;
movd mm2, [dc_iscale] ;; fracstep in low dword
punpckldq mm2, mm2 ;; copy to high dword
mov ebx, [dc_colormap]
mov esi, [dc_source]
;;
;; frac = (dc_texturemid + FixedMul((dc_yl << FRACBITS) - centeryfrac, fracstep));
;;
;; eax == dc_yl already
shl eax, FRACBITS
sub eax, [centeryfrac]
imul dword [dc_iscale]
shrd eax, edx, FRACBITS
add eax, [dc_texturemid]
;;
;; if (dc_hires) frac = 0;
;;
test byte [dc_hires], 0x01
jz .mod2
xor eax, eax
;;
;; Do mod-2 pixel.
;;
.mod2:
test ecx, 1
jz .pairprepare
mov edx, eax ;; edx = frac
add eax, [dc_iscale] ;; eax += fracstep
sar edx, FRACBITS
and edx, ebp ;; edx &= heightmask
movzx edx, byte [esi + edx]
movzx edx, byte [ebx + edx]
mov [edi], dl
add edi, [vid + viddef_s.width]
sub ecx, 1
jz .done
.pairprepare:
;;
;; Prepare for the main loop.
;;
movd mm3, eax ;; Low dword = frac
movq mm4, mm3 ;; Copy to intermediate register
paddd mm4, mm2 ;; dwords of mm4 += fracstep
punpckldq mm3, mm4 ;; Low dword = first frac, high = second
pslld mm2, 1 ;; fracstep *= 2
;;
;; ebp = vid.width
;;
mov ebp, [vid + viddef_s.width]
align 16
.pairloop:
movq mm0, mm3 ;; 3B 1u.
psrad mm0, FRACBITS ;; 4B 1u.
pand mm0, mm1 ;; 3B 1u. frac &= heightmask
paddd mm3, mm2 ;; 3B 1u. frac += fracstep
movd eax, mm0 ;; 3B 1u. Get first frac
;; IFETCH boundary
movzx eax, byte [esi + eax] ;; 4B 1u. Texture map
movzx eax, byte [ebx + eax] ;; 4B 1u. Colormap
punpckhdq mm0, mm0 ;; 3B 1(2)u. low dword = high dword
movd edx, mm0 ;; 3B 1u. Get second frac
mov [edi], al ;; 2B 1(2)u. First pixel
;; IFETCH boundary
movzx edx, byte [esi + edx] ;; 4B 1u. Texture map
movzx edx, byte [ebx + edx] ;; 4B 1u. Colormap
mov [edi + 1*ebp], dl ;; 3B 1(2)u. Second pixel
lea edi, [edi + 2*ebp] ;; 3B 1u. edi += 2 * vid.width
;; IFETCH boundary
sub ecx, 2 ;; 3B 1u. count -= 2
jnz .pairloop ;; 2B 1u. if(count != 0) goto .pairloop
.done:
;;
;; Clear MMX state, or else FPU operations will go badly awry.
;;
emms
pop ebx
pop edi
pop esi
pop ebp
ret
.usenonMMX:
call R_DrawColumn_8_ASM
jmp .done
;;----------------------------------------------------------------------
;;
;; R_Draw2sMultiPatchColumn : Like R_DrawColumn, but omits transparent
;; pixels.
;;
;; MMX column drawer.
;;
;;----------------------------------------------------------------------
;; eax = accumulator
;; ebx = colormap
;; ecx = count
;; edx = accumulator
;; esi = source
;; edi = dest
;; ebp = vid.width
;; mm0 = accumulator
;; mm1 = heightmask, twice
;; mm2 = 2 * fracstep, twice
;; mm3 = pair of consecutive fracs
;;----------------------------------------------------------------------
cglobal R_Draw2sMultiPatchColumn_8_MMX
R_Draw2sMultiPatchColumn_8_MMX:
push ebp ;; preserve caller's stack frame pointer
push esi ;; preserve register variables
push edi
push ebx
;;
;; Our algorithm requires that the texture height be a power of two.
;; If not, fall back to the non-MMX drawer.
;;
.texheightcheck:
mov edx, [dc_texheight]
sub edx, 1 ;; edx = heightmask
test edx, [dc_texheight]
jnz near .usenonMMX
mov ebp, edx ;; Keep a copy of heightmask in a
;; GPR for the time being.
;;
;; Fill mm1 with heightmask
;;
movd mm1, edx ;; low dword = heightmask
punpckldq mm1, mm1 ;; copy low dword to high dword
;;
;; dest = ylookup[dc_yl] + columnofs[dc_x];
;;
mov eax, [dc_yl]
mov edi, [ylookup+eax*4]
mov ebx, [dc_x]
add edi, [columnofs+ebx*4] ;; edi = dest
;;
;; pixelcount = yh - yl + 1
;;
mov ecx, [dc_yh]
add ecx, 1
sub ecx, eax ;; pixel count
jle near .done ;; nothing to scale
;;
;; fracstep = dc_iscale;
;;
movd mm2, [dc_iscale] ;; fracstep in low dword
punpckldq mm2, mm2 ;; copy to high dword
mov ebx, [dc_colormap]
mov esi, [dc_source]
;;
;; frac = (dc_texturemid + FixedMul((dc_yl << FRACBITS) - centeryfrac, fracstep));
;;
;; eax == dc_yl already
shl eax, FRACBITS
sub eax, [centeryfrac]
imul dword [dc_iscale]
shrd eax, edx, FRACBITS
add eax, [dc_texturemid]
;;
;; if (dc_hires) frac = 0;
;;
test byte [dc_hires], 0x01
jz .mod2
xor eax, eax
;;
;; Do mod-2 pixel.
;;
.mod2:
test ecx, 1
jz .pairprepare
mov edx, eax ;; edx = frac
add eax, [dc_iscale] ;; eax += fracstep
sar edx, FRACBITS
and edx, ebp ;; edx &= heightmask
movzx edx, byte [esi + edx]
cmp dl, TRANSPARENTPIXEL
je .nextmod2
movzx edx, byte [ebx + edx]
mov [edi], dl
.nextmod2:
add edi, [vid + viddef_s.width]
sub ecx, 1
jz .done
.pairprepare:
;;
;; Prepare for the main loop.
;;
movd mm3, eax ;; Low dword = frac
movq mm4, mm3 ;; Copy to intermediate register
paddd mm4, mm2 ;; dwords of mm4 += fracstep
punpckldq mm3, mm4 ;; Low dword = first frac, high = second
pslld mm2, 1 ;; fracstep *= 2
;;
;; ebp = vid.width
;;
mov ebp, [vid + viddef_s.width]
align 16
.pairloop:
movq mm0, mm3 ;; 3B 1u.
psrad mm0, FRACBITS ;; 4B 1u.
pand mm0, mm1 ;; 3B 1u. frac &= heightmask
paddd mm3, mm2 ;; 3B 1u. frac += fracstep
movd eax, mm0 ;; 3B 1u. Get first frac
;; IFETCH boundary
movzx eax, byte [esi + eax] ;; 4B 1u. Texture map
punpckhdq mm0, mm0 ;; 3B 1(2)u. low dword = high dword
movd edx, mm0 ;; 3B 1u. Get second frac
cmp al, TRANSPARENTPIXEL ;; 2B 1u.
je .secondinpair ;; 2B 1u.
;; IFETCH boundary
movzx eax, byte [ebx + eax] ;; 4B 1u. Colormap
mov [edi], al ;; 2B 1(2)u. First pixel
.secondinpair:
movzx edx, byte [esi + edx] ;; 4B 1u. Texture map
cmp dl, TRANSPARENTPIXEL ;; 2B 1u.
je .nextpair ;; 2B 1u.
;; IFETCH boundary
movzx edx, byte [ebx + edx] ;; 4B 1u. Colormap
mov [edi + 1*ebp], dl ;; 3B 1(2)u. Second pixel
.nextpair:
lea edi, [edi + 2*ebp] ;; 3B 1u. edi += 2 * vid.width
sub ecx, 2 ;; 3B 1u. count -= 2
jnz .pairloop ;; 2B 1u. if(count != 0) goto .pairloop
.done:
;;
;; Clear MMX state, or else FPU operations will go badly awry.
;;
emms
pop ebx
pop edi
pop esi
pop ebp
ret
.usenonMMX:
call R_Draw2sMultiPatchColumn_8_ASM
jmp .done
;;----------------------------------------------------------------------
;;
;; R_DrawSpan : 8bpp span drawer
;;
;; MMX span drawer.
;;
;;----------------------------------------------------------------------
;; eax = accumulator
;; ebx = colormap
;; ecx = count
;; edx = accumulator
;; esi = source
;; edi = dest
;; ebp = two pixels
;; mm0 = accumulator
;; mm1 = xposition
;; mm2 = yposition
;; mm3 = 2 * xstep
;; mm4 = 2 * ystep
;; mm5 = nflatxshift
;; mm6 = nflatyshift
;; mm7 = accumulator
;;----------------------------------------------------------------------
cglobal R_DrawSpan_8_MMX
R_DrawSpan_8_MMX:
push ebp ;; preserve caller's stack frame pointer
push esi ;; preserve register variables
push edi
push ebx
;;
;; esi = ds_source
;; ebx = ds_colormap
;;
mov esi, [ds_source]
mov ebx, [ds_colormap]
;;
;; edi = ylookup[ds_y] + columnofs[ds_x1]
;;
mov eax, [ds_y]
mov edi, [ylookup + eax*4]
mov edx, [ds_x1]
add edi, [columnofs + edx*4]
;;
;; ecx = ds_x2 - ds_x1 + 1
;;
mov ecx, [ds_x2]
sub ecx, edx
add ecx, 1
;;
;; Needed for fracs and steps
;;
movd mm7, [nflatshiftup]
;;
;; mm3 = xstep
;;
movd mm3, [ds_xstep]
pslld mm3, mm7
punpckldq mm3, mm3
;;
;; mm4 = ystep
;;
movd mm4, [ds_ystep]
pslld mm4, mm7
punpckldq mm4, mm4
;;
;; mm1 = pair of consecutive xpositions
;;
movd mm1, [ds_xfrac]
pslld mm1, mm7
movq mm6, mm1
paddd mm6, mm3
punpckldq mm1, mm6
;;
;; mm2 = pair of consecutive ypositions
;;
movd mm2, [ds_yfrac]
pslld mm2, mm7
movq mm6, mm2
paddd mm6, mm4
punpckldq mm2, mm6
;;
;; mm5 = nflatxshift
;; mm6 = nflatyshift
;;
movd mm5, [nflatxshift]
movd mm6, [nflatyshift]
;;
;; Mask is in memory due to lack of registers.
;;
mov eax, [nflatmask]
mov [nflatmask64], eax
mov [nflatmask64 + 4], eax
;;
;; Go until we reach a dword boundary.
;;
.unaligned:
test edi, 3
jz .alignedprep
.stragglers:
cmp ecx, 0
je .done ;; If ecx == 0, we're finished.
;;
;; eax = ((yposition >> nflatyshift) & nflatmask) | (xposition >> nflatxshift)
;;
movq mm0, mm1 ;; mm0 = xposition
movq mm7, mm2 ;; mm7 = yposition
paddd mm1, mm3 ;; xposition += xstep (once!)
paddd mm2, mm4 ;; yposition += ystep (once!)
psrld mm0, mm5 ;; shift
psrld mm7, mm6 ;; shift
pand mm7, [nflatmask64] ;; mask
por mm0, mm7 ;; or x and y together
movd eax, mm0 ;; eax = index of first pixel
movzx eax, byte [esi + eax] ;; al = source[eax]
movzx eax, byte [ebx + eax] ;; al = colormap[al]
mov [edi], al
add edi, 1
sub ecx, 1
jmp .unaligned
.alignedprep:
;;
;; We can double the steps now.
;;
pslld mm3, 1
pslld mm4, 1
;;
;; Generate chunks of four pixels.
;;
.alignedloop:
;;
;; Make sure we have at least four pixels.
;;
cmp ecx, 4
jl .prestragglers
;;
;; First two pixels.
;;
movq mm0, mm1 ;; mm0 = xposition
movq mm7, mm2 ;; mm7 = yposition
paddd mm1, mm3 ;; xposition += xstep
paddd mm2, mm4 ;; yposition += ystep
psrld mm0, mm5 ;; shift
psrld mm7, mm6 ;; shift
pand mm7, [nflatmask64] ;; mask
por mm0, mm7 ;; or x and y together
movd eax, mm0 ;; eax = index of first pixel
movzx eax, byte [esi + eax] ;; al = source[eax]
movzx ebp, byte [ebx + eax] ;; ebp = colormap[al]
punpckhdq mm0, mm0 ;; both dwords = high dword
movd eax, mm0 ;; eax = index of second pixel
movzx eax, byte [esi + eax] ;; al = source[eax]
movzx eax, byte [ebx + eax] ;; al = colormap[al]
shl eax, 8 ;; get pixel in right byte
or ebp, eax ;; put pixel in ebp
;;
;; Next two pixels.
;;
movq mm0, mm1 ;; mm0 = xposition
movq mm7, mm2 ;; mm7 = yposition
paddd mm1, mm3 ;; xposition += xstep
paddd mm2, mm4 ;; yposition += ystep
psrld mm0, mm5 ;; shift
psrld mm7, mm6 ;; shift
pand mm7, [nflatmask64] ;; mask
por mm0, mm7 ;; or x and y together
movd eax, mm0 ;; eax = index of third pixel
movzx eax, byte [esi + eax] ;; al = source[eax]
movzx eax, byte [ebx + eax] ;; al = colormap[al]
shl eax, 16 ;; get pixel in right byte
or ebp, eax ;; put pixel in ebp
punpckhdq mm0, mm0 ;; both dwords = high dword
movd eax, mm0 ;; eax = index of second pixel
movzx eax, byte [esi + eax] ;; al = source[eax]
movzx eax, byte [ebx + eax] ;; al = colormap[al]
shl eax, 24 ;; get pixel in right byte
or ebp, eax ;; put pixel in ebp
;;
;; Write pixels.
;;
mov [edi], ebp
add edi, 4
sub ecx, 4
jmp .alignedloop
.prestragglers:
;;
;; Back to one step at a time.
;;
psrad mm3, 1
psrad mm4, 1
jmp .stragglers
.done:
;;
;; Clear MMX state, or else FPU operations will go badly awry.
;;
emms
pop ebx
pop edi
pop esi
pop ebp
ret
Reference in a new issue View git blame Copy permalink