mirror of https://github.com/nmlgc/ReC98.git
190 lines
3.6 KiB
NASM
190 lines
3.6 KiB
NASM
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PAGE 98,120
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; grcg - triangle
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;
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; Function:
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; void far _pascal grcg_triangle( int x1, int y1, int x2, int y2, int x3, int y3 ) ;
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;
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; Description:
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; 三角形塗りつぶし(青プレーンのみ)
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;
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; Parameters:
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; int x1,y1 第１点の座標
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; int x2,y2 第２点の座標
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; int x3,y3 第３点の座標
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;
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; BINDING TARGET:
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; Microsoft-C / Turbo-C / MS-PASCAL? / MS-FORTRAN?
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;
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; RUNNING TARGET:
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; grcg_trapezoid に依存
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;
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; REQUIRING RESOURCES:
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; CPU: V30
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; grcg_trapezoid に依存
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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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; (あらかじめgc_colorで色を設定してから呼びだし、終ったらgc_reset()で
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; グラフィックチャージャーのスイッチを切る)
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; ・クリッピングはgrcg_trapezoidに依っています。
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;
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; 関連関数:
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; gc_color(), gc_reset()
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; grc_setclip()
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; make_linework
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; draw_trapezoid
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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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; Revision History:
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; 92/3/21 Initial
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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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; 92/6/4 外の台形呼ぶようにしたら、仕様がちがった〜ひー
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; 92/6/5 ↑ので直したのだ。
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; 92/6/6 ClipYT_seg対応 = クリッピング対応完了
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; 92/6/16 TASM対応
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MRETURN macro
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pop SI
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pop DI
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leave
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ret 12
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EVEN
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endm
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;=========================================================================
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; void far _pascal grcg_triangle( int x1,int y1, int x2,int y2, int x3,int y3 )
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func GRCG_TRIANGLE
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push BP
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mov BP,SP
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push DI
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push SI
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; パラメータ
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@@x1 = (RETSIZE+6)*2
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@@y1 = (RETSIZE+5)*2
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@@x2 = (RETSIZE+4)*2
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@@y2 = (RETSIZE+3)*2
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@@x3 = (RETSIZE+2)*2
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@@y3 = (RETSIZE+1)*2
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; 描画セグメントを設定する
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mov ES,ClipYT_seg
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; ｙ座標順に並べ替え(とりあえず〜)
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mov AX,[BP+@@x1]
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mov BX,[BP+@@y1]
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mov CX,[BP+@@x2]
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mov DX,[BP+@@y2]
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mov SI,[BP+@@x3]
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mov DI,[BP+@@y3]
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cmp BX,DX ; y1,y2
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jl short @@sort1
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xchg AX,CX ; x1,x2
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xchg BX,DX ; y1,y2
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@@sort1:
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cmp BX,DI ; y1,y3
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jl short @@sort2
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xchg AX,SI ; x1,x3
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xchg BX,DI ; y1,y3
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@@sort2:
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cmp DX,DI ; y2,y3
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jl short @@sort3
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xchg CX,SI ; x2,x3
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xchg DX,DI ; y2,y3
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@@sort3:
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mov [BP+@@x1],AX
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mov AX,ClipYT
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sub BX,AX
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cmp BX,ClipYH
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jg short @@TAIL ; 完全に枠の下 → clip out
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mov [BP+@@y1],BX
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mov [BP+@@x2],CX
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sub DX,AX
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mov [BP+@@y2],DX
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mov [BP+@@x3],SI
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sub DI,AX
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jl short @@TAIL ; 完全に枠の上 → clip out
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mov [BP+@@y3],DI
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;
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; DI = y3
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; AX = x3
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mov AX,SI
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; SI = y1
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mov SI,BX
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mov CX,DI ; y3
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mov BX,offset trapez_b
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sub CX,SI ; y1
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mov ylen,CX
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mov DX,[BP+@@x1]
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call make_linework
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mov DX,[BP+@@x2]
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mov BX,offset trapez_a
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mov CX,[BP+@@y2]
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cmp CX,SI ; y2,y1
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jne short @@CHECK2
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; 上辺が水平な場合
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mov AX,[BP+@@x3]
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sub DI,CX ; y3 - y2
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mov CX,DI ;
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call make_linework
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imul SI,SI,80
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mov DX,ylen
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push offset @@TAIL
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jmp draw_trapezoid
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EVEN
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@@TAIL:
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MRETURN ; こんな所にもリターンが
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@@CHECK2:
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cmp DI,CX ; y3,y2
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jne short @@DOUBLE
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; 底辺が水平な場合
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sub CX,SI ; y1
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mov AX,DX ; x2
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mov DX,[BP+@@x1]
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call make_linework
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imul SI,SI,80
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mov DX,ylen
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push offset @@TAIL
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jmp draw_trapezoid
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EVEN
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; 水平な辺がない場合
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@@DOUBLE:
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sub CX,SI ; DI = y2 - y1
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mov DI,CX ;
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mov AX,DX ; x2
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mov DX,[BP+@@x1]
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call make_linework
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mov AX,[BP+@@x2]
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cmp [BP+@@x3],AX
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lea DX,[DI-1]
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imul SI,SI,80
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call draw_trapezoid
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mov CX,[BP+@@y3]
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mov AX,[BP+@@x3]
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sub CX,[BP+@@y2]
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mov ylen,CX
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mov DX,[BP+@@x2]
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mov BX,offset trapez_a
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call make_linework
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mov DX,ylen
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call draw_trapezoid
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MRETURN
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endfunc
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