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ReC98/libs/master.lib/draw_trapezoid.asm

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[Reduction] #422: draw_trapezoid Yup. From TH03 on, ZUN uses a different version of master.lib, containing more features than the last official version 0.23 from May 1995. Given the relative insignificance of the features in question, I presume that Amusement Makers must have kept their own, improved fork of master.lib, rather than ZUN having hacked master.lib on his own. Anyway, that doesn't matter. In the end, we still have to reverse-engineer each and every one of these changes, and some of the more complicated functions won't even be reduced before the actual reverse-engineering step of this project. [Binary change] Order of 3 relocations in TH05's OP.EXE.
2014-08-31 16:08:50 +00:00
PAGE 98,120
; gc_poly library - grcg - trapezoid - PC98V
;
; Subroutines:
; draw_trapezoid
;
; Variables:
; trapez_a, trapez_b 台形描画作業変数
;
; Description:
; 台形塗りつぶし(grc_setclip()で設定した領域が対象)
;
; Binding Target:
; asm routine
;
; Running Target:
; NEC PC-9801 Normal mode
;
; Requiring Resources:
; CPU: V30
; GRAPHICS ACCELARATOR: GRAPHIC CHARGER
;
; Assembler:
; TASM 3.0
; OPTASM 1.6
;
; Notes:
; ・グラフィック画面の青プレーンにのみ描画します。
; ・色をつけるには、グラフィックチャージャーを利用してください。
; ・grc_setclip()によるクリッピングに対応しています。
; 　ｙ座標が上境界にかかっていると遅くなります。
; 　（上境界との交点を計算せずに、上から順に調べているため）
; ・側辺同士が交差している場合、ねじれた台形（２つの三角形が頂点で
; 　接している状態）を描画します。
;
; Author:
; 恋塚昭彦
;
; 関連関数:
; grc_setclip()
;
; Revision History:
; 92/3/21 Initial
; 92/3/29 bug fix, 台形に側辺の交差を認めるようにした
; 92/4/2 少々加速
; 92/4/18 三角形ﾙｰﾁﾝから分離。ｸﾘｯﾋﾟﾝｸﾞ付加。
; 92/4/19 少々加速
; 92/5/7 自己書き換えにより加速
; 92/5/20 任意ｸﾘｯﾋﾟﾝｸﾞの横にだけ対応。:-)
; 92/5/22 ↑これも自己書き換え〜
; 92/6/4 grcg_trapezoid()関数をgc_zoid.asmに分割。
; 92/6/5 bugfix(make_lineworkのCXが0の時のdiv 0回避)
; 92/6/5 下端クリップ対応
; 92/6/12 加速〜
; 92/6/16 TASMに対応
; 92/7/13 make_lin.asmを分離
; 93/ 5/29 [M0.18] .CONST->.DATA
; 94/ 2/23 [M0.23] make_lineworkのEXTRNを削除(それだけ(^^;)
; LINEWORK構造体の各メンバの定義
; 名称 - ｵﾌｾｯﾄ - 説明
[Reverse-engineering] [th01/zunsoft] Identify all global variables Yup, the code for the first ZUN Soft logo is now completely position- independent and ready to be decompiled. (Also, TIL that the PC-98 GRCG has hardware support for double-buffering through page flipping. Heh, at least one feature that makes it a viable system for games...)
2015-01-13 17:10:24 +00:00
koizoid_x = 0 ; 現在のx座標
koizoid_dlx = 2 ; 誤差変数への加算値
koizoid_s = 4 ; 誤差変数
koizoid_d = 6 ; 最小横移動量(符号付き)
[Reduction] #422: draw_trapezoid Yup. From TH03 on, ZUN uses a different version of master.lib, containing more features than the last official version 0.23 from May 1995. Given the relative insignificance of the features in question, I presume that Amusement Makers must have kept their own, improved fork of master.lib, rather than ZUN having hacked master.lib on his own. Anyway, that doesn't matter. In the end, we still have to reverse-engineer each and every one of these changes, and some of the more complicated functions won't even be reduced before the actual reverse-engineering step of this project. [Binary change] Order of 3 relocations in TH05's OP.EXE.
2014-08-31 16:08:50 +00:00
;-------------------------------------------------------------------------
; draw_trapezoid - 台形の描画
; IN:
; SI : unsigned yadr ; 描画する三角形の上のラインの左端のVRAMｵﾌｾｯﾄ
; DX : unsigned ylen ; 描画する三角形の上下のライン差(y2-y1)
; ES : unsigned gseg ; 描画するVRAMのセグメント(ClipYT_seg)
; trapez_a ; 側辺aのxの初期値と傾き
; trapez_b ; 側辺bのxの初期値と傾き
; ClipYB_adr ; 描画するVRAMの最下座標の左端のアドレス
; ClipXL ; 描画するVRAMの左側切り落とし x 座標
; ClipXW ; ClipXLと、右側 x 座標の差(正数)
; BREAKS:
; AX,BX,CX,DX,SI,DI,flags
;
public draw_trapezoid
draw_trapezoid PROC NEAR
mov AX,ClipYB_adr
mov CS:[koizoid_yb_adr],AX
[Reverse-engineering] [th01/zunsoft] Identify all global variables Yup, the code for the first ZUN Soft logo is now completely position- independent and ready to be decompiled. (Also, TIL that the PC-98 GRCG has hardware support for double-buffering through page flipping. Heh, at least one feature that makes it a viable system for games...)
2015-01-13 17:10:24 +00:00
mov AX,[trapez_a+koizoid_d]
[Reduction] #422: draw_trapezoid Yup. From TH03 on, ZUN uses a different version of master.lib, containing more features than the last official version 0.23 from May 1995. Given the relative insignificance of the features in question, I presume that Amusement Makers must have kept their own, improved fork of master.lib, rather than ZUN having hacked master.lib on his own. Anyway, that doesn't matter. In the end, we still have to reverse-engineer each and every one of these changes, and some of the more complicated functions won't even be reduced before the actual reverse-engineering step of this project. [Binary change] Order of 3 relocations in TH05's OP.EXE.
2014-08-31 16:08:50 +00:00
mov CS:[koizoid_trapez_a_d],AX
[Reverse-engineering] [th01/zunsoft] Identify all global variables Yup, the code for the first ZUN Soft logo is now completely position- independent and ready to be decompiled. (Also, TIL that the PC-98 GRCG has hardware support for double-buffering through page flipping. Heh, at least one feature that makes it a viable system for games...)
2015-01-13 17:10:24 +00:00
mov AX,[trapez_b+koizoid_d]
[Reduction] #422: draw_trapezoid Yup. From TH03 on, ZUN uses a different version of master.lib, containing more features than the last official version 0.23 from May 1995. Given the relative insignificance of the features in question, I presume that Amusement Makers must have kept their own, improved fork of master.lib, rather than ZUN having hacked master.lib on his own. Anyway, that doesn't matter. In the end, we still have to reverse-engineer each and every one of these changes, and some of the more complicated functions won't even be reduced before the actual reverse-engineering step of this project. [Binary change] Order of 3 relocations in TH05's OP.EXE.
2014-08-31 16:08:50 +00:00
mov CS:[koizoid_trapez_b_d],AX
[Reverse-engineering] [th01/zunsoft] Identify all global variables Yup, the code for the first ZUN Soft logo is now completely position- independent and ready to be decompiled. (Also, TIL that the PC-98 GRCG has hardware support for double-buffering through page flipping. Heh, at least one feature that makes it a viable system for games...)
2015-01-13 17:10:24 +00:00
mov AX,[trapez_a+koizoid_dlx]
[Reduction] #422: draw_trapezoid Yup. From TH03 on, ZUN uses a different version of master.lib, containing more features than the last official version 0.23 from May 1995. Given the relative insignificance of the features in question, I presume that Amusement Makers must have kept their own, improved fork of master.lib, rather than ZUN having hacked master.lib on his own. Anyway, that doesn't matter. In the end, we still have to reverse-engineer each and every one of these changes, and some of the more complicated functions won't even be reduced before the actual reverse-engineering step of this project. [Binary change] Order of 3 relocations in TH05's OP.EXE.
2014-08-31 16:08:50 +00:00
mov CS:[koizoid_trapez_a_dlx],AX
[Reverse-engineering] [th01/zunsoft] Identify all global variables Yup, the code for the first ZUN Soft logo is now completely position- independent and ready to be decompiled. (Also, TIL that the PC-98 GRCG has hardware support for double-buffering through page flipping. Heh, at least one feature that makes it a viable system for games...)
2015-01-13 17:10:24 +00:00
mov AX,[trapez_b+koizoid_dlx]
[Reduction] #422: draw_trapezoid Yup. From TH03 on, ZUN uses a different version of master.lib, containing more features than the last official version 0.23 from May 1995. Given the relative insignificance of the features in question, I presume that Amusement Makers must have kept their own, improved fork of master.lib, rather than ZUN having hacked master.lib on his own. Anyway, that doesn't matter. In the end, we still have to reverse-engineer each and every one of these changes, and some of the more complicated functions won't even be reduced before the actual reverse-engineering step of this project. [Binary change] Order of 3 relocations in TH05's OP.EXE.
2014-08-31 16:08:50 +00:00
mov CS:[koizoid_trapez_b_dlx],AX
mov AX,ClipXL
mov CS:[koizoid_clipxl_1],AX
mov CS:[koizoid_clipxl_2],AX
mov AX,ClipXW
mov CS:[koizoid_clipxw_1],AX
jmp short $+2
push BP
[Reverse-engineering] [th01/zunsoft] Identify all global variables Yup, the code for the first ZUN Soft logo is now completely position- independent and ready to be decompiled. (Also, TIL that the PC-98 GRCG has hardware support for double-buffering through page flipping. Heh, at least one feature that makes it a viable system for games...)
2015-01-13 17:10:24 +00:00
mov CX,[trapez_a+koizoid_x]
mov BP,[trapez_b+koizoid_x]
[Reduction] #422: draw_trapezoid Yup. From TH03 on, ZUN uses a different version of master.lib, containing more features than the last official version 0.23 from May 1995. Given the relative insignificance of the features in question, I presume that Amusement Makers must have kept their own, improved fork of master.lib, rather than ZUN having hacked master.lib on his own. Anyway, that doesn't matter. In the end, we still have to reverse-engineer each and every one of these changes, and some of the more complicated functions won't even be reduced before the actual reverse-engineering step of this project. [Binary change] Order of 3 relocations in TH05's OP.EXE.
2014-08-31 16:08:50 +00:00
@@YLOOP:
; 水平線 (with clipping) start ===================================
; IN: SI... x=0の時のVRAM ADDR(y*80) BP,CX... 二つのx座標
cmp SI,1234h
org $-2
koizoid_yb_adr dw ?
ja short @@SKIP_HLINE ; yが範囲外 → skip
mov AX,1234h ; クリップ枠左端分ずらす
org $-2
koizoid_clipxl_1 dw ? ; ClipXL
sub CX,AX
mov BX,BP
sub BX,AX
test CX,BX ; xが共にマイナスなら範囲外
js short @@SKIP_HLINE
cmp CX,BX
jg short @@S10
xchg CX,BX ; CXは必ず非負になる
@@S10:
cmp BH,80h ; if BX < 0 then BX := 0
sbb AX,AX
and BX,AX
mov DI,1234h ; ClipXW
org $-2
koizoid_clipxw_1 dw ?
sub CX,DI ; if CX >= ClipXW then CX := ClipXW
sbb AX,AX
and CX,AX
add CX,DI
sub CX,BX ; CX := bitlen
; BX := left-x
jl short @@SKIP_HLINE ; ともに右に範囲外 → skip
add BX,1234h ; ClipXL
org $-2
koizoid_clipxl_2 dw ?
mov DI,BX ; addr := yaddr + xl div $10 * 2
shr DI,4
shl DI,1
add DI,SI
and BX,0Fh ; BX := xl and $0F
add CX,BX
sub CX,16
shl BX,1
mov AX,[EDGES+BX] ; 左エッジ
not AX
Replace MASTERMOD with a per-game constant Yup, packfiles finally proved that we really have a different set of changes to master.lib in every game. Also, there are bound to be more of these game- specific small changes to otherwise identical code in ZUN's own code. And hey, no need to define that value in the build scripts anymore. (I've also considered just copying modified versions into the individual game subdirectories, but it's not too nice to expect people to diff them in order to actually understand why these copies exist and where the changes actually are.)
2014-11-15 01:03:41 +00:00
if GAME ge 3
[Reduction] #422: draw_trapezoid Yup. From TH03 on, ZUN uses a different version of master.lib, containing more features than the last official version 0.23 from May 1995. Given the relative insignificance of the features in question, I presume that Amusement Makers must have kept their own, improved fork of master.lib, rather than ZUN having hacked master.lib on his own. Anyway, that doesn't matter. In the end, we still have to reverse-engineer each and every one of these changes, and some of the more complicated functions won't even be reduced before the actual reverse-engineering step of this project. [Binary change] Order of 3 relocations in TH05's OP.EXE.
2014-08-31 16:08:50 +00:00
and AX,trapezoid_hmask
endif
mov BX,CX ;
and BX,0Fh
shl BX,1
sar CX,4
js short @@LASTW
stosw
Replace MASTERMOD with a per-game constant Yup, packfiles finally proved that we really have a different set of changes to master.lib in every game. Also, there are bound to be more of these game- specific small changes to otherwise identical code in ZUN's own code. And hey, no need to define that value in the build scripts anymore. (I've also considered just copying modified versions into the individual game subdirectories, but it's not too nice to expect people to diff them in order to actually understand why these copies exist and where the changes actually are.)
2014-11-15 01:03:41 +00:00
if GAME ge 3
[Reduction] #422: draw_trapezoid Yup. From TH03 on, ZUN uses a different version of master.lib, containing more features than the last official version 0.23 from May 1995. Given the relative insignificance of the features in question, I presume that Amusement Makers must have kept their own, improved fork of master.lib, rather than ZUN having hacked master.lib on his own. Anyway, that doesn't matter. In the end, we still have to reverse-engineer each and every one of these changes, and some of the more complicated functions won't even be reduced before the actual reverse-engineering step of this project. [Binary change] Order of 3 relocations in TH05's OP.EXE.
2014-08-31 16:08:50 +00:00
mov AX,trapezoid_hmask
else
mov AX,0FFFFh
endif
rep stosw
@@LASTW: and AX,[EDGES+2+BX] ; 右エッジ
stosw
; 水平線 (with clipping) end ===================================
@@SKIP_HLINE:
[Reverse-engineering] [th01/zunsoft] Identify all global variables Yup, the code for the first ZUN Soft logo is now completely position- independent and ready to be decompiled. (Also, TIL that the PC-98 GRCG has hardware support for double-buffering through page flipping. Heh, at least one feature that makes it a viable system for games...)
2015-01-13 17:10:24 +00:00
add [trapez_a+koizoid_s],1234h
[Reduction] #422: draw_trapezoid Yup. From TH03 on, ZUN uses a different version of master.lib, containing more features than the last official version 0.23 from May 1995. Given the relative insignificance of the features in question, I presume that Amusement Makers must have kept their own, improved fork of master.lib, rather than ZUN having hacked master.lib on his own. Anyway, that doesn't matter. In the end, we still have to reverse-engineer each and every one of these changes, and some of the more complicated functions won't even be reduced before the actual reverse-engineering step of this project. [Binary change] Order of 3 relocations in TH05's OP.EXE.
2014-08-31 16:08:50 +00:00
org $-2
koizoid_trapez_a_dlx dw ?
[Reverse-engineering] [th01/zunsoft] Identify all global variables Yup, the code for the first ZUN Soft logo is now completely position- independent and ready to be decompiled. (Also, TIL that the PC-98 GRCG has hardware support for double-buffering through page flipping. Heh, at least one feature that makes it a viable system for games...)
2015-01-13 17:10:24 +00:00
mov CX,[trapez_a+koizoid_x]
[Reduction] #422: draw_trapezoid Yup. From TH03 on, ZUN uses a different version of master.lib, containing more features than the last official version 0.23 from May 1995. Given the relative insignificance of the features in question, I presume that Amusement Makers must have kept their own, improved fork of master.lib, rather than ZUN having hacked master.lib on his own. Anyway, that doesn't matter. In the end, we still have to reverse-engineer each and every one of these changes, and some of the more complicated functions won't even be reduced before the actual reverse-engineering step of this project. [Binary change] Order of 3 relocations in TH05's OP.EXE.
2014-08-31 16:08:50 +00:00
adc CX,1234h
org $-2
koizoid_trapez_a_d dw ?
[Reverse-engineering] [th01/zunsoft] Identify all global variables Yup, the code for the first ZUN Soft logo is now completely position- independent and ready to be decompiled. (Also, TIL that the PC-98 GRCG has hardware support for double-buffering through page flipping. Heh, at least one feature that makes it a viable system for games...)
2015-01-13 17:10:24 +00:00
mov [trapez_a+koizoid_x],CX
[Reduction] #422: draw_trapezoid Yup. From TH03 on, ZUN uses a different version of master.lib, containing more features than the last official version 0.23 from May 1995. Given the relative insignificance of the features in question, I presume that Amusement Makers must have kept their own, improved fork of master.lib, rather than ZUN having hacked master.lib on his own. Anyway, that doesn't matter. In the end, we still have to reverse-engineer each and every one of these changes, and some of the more complicated functions won't even be reduced before the actual reverse-engineering step of this project. [Binary change] Order of 3 relocations in TH05's OP.EXE.
2014-08-31 16:08:50 +00:00
[Reverse-engineering] [th01/zunsoft] Identify all global variables Yup, the code for the first ZUN Soft logo is now completely position- independent and ready to be decompiled. (Also, TIL that the PC-98 GRCG has hardware support for double-buffering through page flipping. Heh, at least one feature that makes it a viable system for games...)
2015-01-13 17:10:24 +00:00
add [trapez_b+koizoid_s],1234h
[Reduction] #422: draw_trapezoid Yup. From TH03 on, ZUN uses a different version of master.lib, containing more features than the last official version 0.23 from May 1995. Given the relative insignificance of the features in question, I presume that Amusement Makers must have kept their own, improved fork of master.lib, rather than ZUN having hacked master.lib on his own. Anyway, that doesn't matter. In the end, we still have to reverse-engineer each and every one of these changes, and some of the more complicated functions won't even be reduced before the actual reverse-engineering step of this project. [Binary change] Order of 3 relocations in TH05's OP.EXE.
2014-08-31 16:08:50 +00:00
org $-2
koizoid_trapez_b_dlx dw ?
adc BP,1234h
org $-2
koizoid_trapez_b_d dw ?
add SI,80 ; yadr
dec DX ; ylen
js short @@OWARI
jmp @@YLOOP ; うぐぐ(;_;)
@@OWARI:
[Reverse-engineering] [th01/zunsoft] Identify all global variables Yup, the code for the first ZUN Soft logo is now completely position- independent and ready to be decompiled. (Also, TIL that the PC-98 GRCG has hardware support for double-buffering through page flipping. Heh, at least one feature that makes it a viable system for games...)
2015-01-13 17:10:24 +00:00
mov [trapez_b+koizoid_x],BP
[Reduction] #422: draw_trapezoid Yup. From TH03 on, ZUN uses a different version of master.lib, containing more features than the last official version 0.23 from May 1995. Given the relative insignificance of the features in question, I presume that Amusement Makers must have kept their own, improved fork of master.lib, rather than ZUN having hacked master.lib on his own. Anyway, that doesn't matter. In the end, we still have to reverse-engineer each and every one of these changes, and some of the more complicated functions won't even be reduced before the actual reverse-engineering step of this project. [Binary change] Order of 3 relocations in TH05's OP.EXE.
2014-08-31 16:08:50 +00:00
pop BP
ret
EVEN
draw_trapezoid ENDP