2014-08-27 03:05:30 +00:00
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PAGE 98,120
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; gc_poly library - calc - trapezoid
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;
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; Subroutines:
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; make_linework
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;
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; Variables:
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; trapez_a, trapez_b 台形描画作業変数
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;
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; Description:
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; 台形描画用の側辺データ設定
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;
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; Binding Target:
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; asm routine
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;
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; Running Target:
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; NEC PC-9801 Normal mode
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;
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; Requiring Resources:
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; CPU: V30
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;
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; Assembler:
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; TASM 3.0
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; OPTASM 1.6
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;
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; Notes:
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;
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; Author:
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; 恋塚昭彦
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;
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; 関連関数:
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;
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;
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; Revision History:
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; 92/3/21 Initial(koizoid.asm)
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; 92/3/29 bug fix, 台形に側辺の交差を認めるようにした
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; 92/4/2 少々加速
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; 92/4/18 三角形ﾙｰﾁﾝから分離。ｸﾘｯﾋﾟﾝｸﾞ付加。
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; 92/4/19 少々加速
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; 92/5/7 自己書き換えにより加速
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; 92/5/20 任意ｸﾘｯﾋﾟﾝｸﾞの横にだけ対応。:-)
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; 92/5/22 ↑これも自己書き換え〜
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; 92/6/4 grcg_trapezoid()関数をgc_zoid.asmに分割。
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; 92/6/5 bugfix(make_lineworkのCXが0の時のdiv 0回避)
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; 92/6/5 下端クリップ対応
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; 92/6/12 加速〜
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; 92/6/16 TASMに対応
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; 92/7/13 make_line.asmに分離
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; LINEWORK構造体の各メンバの定義
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; 名称 - ｵﾌｾｯﾄ - 説明
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2015-01-13 17:10:24 +00:00
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make_lin_x = 0 ; 現在のx座標
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make_lin_dlx = 2 ; 誤差変数への加算値
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make_lin_s = 4 ; 誤差変数
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make_lin_d = 6 ; 最小横移動量(符号付き)
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2014-08-27 03:05:30 +00:00
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;-------------------------------------------------------------------------
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; make_linework - DDA LINE用構造体の作成
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; IN:
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; DS:BX : LINEWORK * w ; 書き込み先
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; DX : int x1 ; 上点のx
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; AX : int x2 ; 下の点のx
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; CX : int y2 - y1 ; 上下のyの差
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;
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; BREAKS:
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; AX,CX,DX,Flags
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;
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public make_linework
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EVEN
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make_linework PROC NEAR
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push SI
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2015-01-13 17:10:24 +00:00
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mov [BX+make_lin_x],DX ; w.x = x1
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2014-08-27 03:05:30 +00:00
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sub AX,DX ; AX = (x2 - x1)
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cmp CX,1
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adc CX,0
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cwd
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idiv CX
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cmp DX,8000h
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adc AX,-1
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2015-01-13 17:10:24 +00:00
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mov [BX+make_lin_d],AX ; w.d = (x2-x1)/(y2-y1)
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2014-08-27 03:05:30 +00:00
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cmp DX,8000h
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cmc
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sbb SI,SI
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add DX,SI
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xor DX,SI
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xor AX,AX
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div CX
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add AX,SI
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xor AX,SI
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2015-01-13 17:10:24 +00:00
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mov [BX+make_lin_dlx],AX ; w.dlx = (x2-x1)%(y2-y1)*0x10000L
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mov word ptr [BX+make_lin_s],8000h ; w.s = 8000h
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2014-08-27 03:05:30 +00:00
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pop SI
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ret
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EVEN
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make_linework ENDP
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