2014-08-27 22:48:06 +00:00
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PAGE 98,120
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; graphics - grcg - vline - PC98V
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;
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; DESCRIPTION:
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; 垂直線の描画(青プレーンのみ)
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;
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; FUNCTION:
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; void grcg_vline( int x, int y1, int y2 ) ;
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; PARAMETERS:
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; int x x座標
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; int y1 上のy座標
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; int y2 下のy座標
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;
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; BINDING TARGET:
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; Microsoft-C / Turbo-C
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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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; GRAPHICS ACCELARATOR: GRAPHIC CHARGER
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;
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; COMPILER/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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; ・グラフィック画面の青プレーンにのみ描画します。
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; ・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。
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; ・grc_setclip()によるクリッピングに対応しています。
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; ・y1,y2の上下関係は逆でも(速度も)全く変わりなく動作します。
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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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; grc_setclip()
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;
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; HISTORY:
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; 92/10/5 Initial
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; 93/10/15 [M0.21] 縦クリッピングのbugfix (iR氏報告)
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; 93/11/26 [M0.22] ↑さらに(;_;) yの小さいほうが負だと…
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; 94/ 3/12 [M0.23] 無駄なことやってたので縮小
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MRETURN macro
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pop DI
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pop BP
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ret 6
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|
EVEN
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endm
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func GRCG_VLINE
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push BP
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mov BP,SP
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push DI
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; PARAMETERS
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2015-01-13 17:10:24 +00:00
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@@x = (RETSIZE+3)*2
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@@y1 = (RETSIZE+2)*2
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@@y2 = (RETSIZE+1)*2
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2014-08-27 22:48:06 +00:00
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mov AX,ClipYT
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mov CX,ClipYH
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2015-01-13 17:10:24 +00:00
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mov BX,[BP+@@y1]
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mov DX,[BP+@@y2]
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2014-08-27 22:48:06 +00:00
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cmp BX,DX
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jl short @@GO
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xchg BX,DX
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@@GO:
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; yの変換とクリップ
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sub DX,AX
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jl short @@RETURN
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sub BX,AX
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cmp BH,80h
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sbb DI,DI
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and BX,DI
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cmp BX,CX
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jg short @@RETURN
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sub DX,CX ; DXは負になりえない(Clip枠が正である前提)
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sbb DI,DI
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and DX,DI
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add DX,CX
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2015-01-13 17:10:24 +00:00
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mov AX,[BP+@@x] ; xのクリップ
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2014-08-27 22:48:06 +00:00
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cmp AX,ClipXL
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jl short @@RETURN
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cmp AX,ClipXR
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jg short @@RETURN
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mov CX,AX
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and CL,07h
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shr AX,3
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mov DI,AX
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mov AL,80h
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shr AL,CL
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mov CX,DX ; 増分の計算
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mov DX,80-1 ; DXが増分(stosbで増える1をあらかじめ減らす)
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sub CX,BX ; CXは長さ
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imul BX,BX,80
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add DI,BX
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mov ES,ClipYT_seg ; セグメント設定
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inc CX ; 長さを出す(abs(y2-y1)+1)
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shr CX,1
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jnb short @@S1
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stosb
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add DI,DX
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@@S1:
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shr CX,1
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jnb short @@S2
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stosb
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add DI,DX
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stosb
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add DI,DX
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@@S2: jcxz short @@RETURN
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EVEN
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@@L: stosb
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add DI,DX
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stosb
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add DI,DX
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stosb
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add DI,DX
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stosb
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add DI,DX
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loop short @@L
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@@RETURN:
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MRETURN
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endfunc
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