mirror of https://github.com/nmlgc/ReC98.git
279 lines
4.0 KiB
NASM
279 lines
4.0 KiB
NASM
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; master library - gc_poly - grcg - circle
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;
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; Description:
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; 円描画
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;
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; Function/Procedures:
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; void grcg_circle( int x, int y, unsigned r ) ;
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;
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; Parameters:
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; x,y 中心座標
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; r 半径 ( 1 以上 )
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;
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; Returns:
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; none
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;
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; Binding Target:
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; Microsoft-C / Turbo-C / Turbo Pascal
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;
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; Running Target:
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; PC-9801V
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;
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; Requiring Resources:
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; CPU: V30
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; GRCG
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;
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; Notes:
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; 半径が 0 ならば描画しません。
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;
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; Assembly Language Note:
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;
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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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; Author:
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; 恋塚昭彦
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;
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; Revision History:
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; 93/ 5/12 Initial:gc_circl.asm/master.lib 0.16
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; 93/ 5/14 [M0.16] 加速
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; 95/ 2/20 縦倍モード対応
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; 95/ 3/25 [M0.22k] ゴミがでるバグ修正
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MRETURN macro
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pop DI
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pop SI
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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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retfunc GC_CIRCL_ALLIN
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pop SI
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pop BP
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jmp GRCG_CIRCLE_X
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GC_CIRCL_CLIPOUT:
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pop SI
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pop BP
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ret 6
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EVEN
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endfunc
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func GRCG_CIRCLE ; grcg_circle() {
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push BP
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mov BP,SP
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push SI
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; DIは下の方でpushしてる
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; 引数
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@@x = (RETSIZE+3)*2
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@@y = (RETSIZE+2)*2
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@@r = (RETSIZE+1)*2
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mov SI,[BP+@@r] ; SI = 半径
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xor CX,CX ; どこかクリップ枠にひっかかったら 0以外にー
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; 大まかなクリッピング
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mov AX,[BP+@@y]
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sub AX,ClipYT
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mov DX,AX ; DX = y
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sub AX,SI
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cmp AX,ClipYH
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jg short GC_CIRCL_CLIPOUT
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shl AX,1
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rcl CX,1
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mov AX,DX
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add AX,SI
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js short GC_CIRCL_CLIPOUT
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cmp ClipYH,AX
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rcl CX,1
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mov AX,[BP+@@x]
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mov BX,AX ; BX = x
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sub AX,SI
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cmp AX,ClipXR
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jg short GC_CIRCL_CLIPOUT
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sub AX,ClipXL
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shl AX,1
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rcl CX,1
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mov AX,BX
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add AX,SI
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cmp AX,ClipXL
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jl short GC_CIRCL_CLIPOUT
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cmp ClipXR,AX
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rcl CX,1
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jcxz short GC_CIRCL_ALLIN
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; 半径が 0 なら描画しない
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or SI,SI
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jz short GC_CIRCL_CLIPOUT
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push DI
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mov AL,byte ptr graph_VramZoom
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mov CS:GC_CIRCL_VRAMZOOM1,AL
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mov CS:GC_CIRCL_VRAMZOOM2,AL
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mov ES,ClipYT_seg
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mov AX,BX ; AX = x
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mov gc_circl_cx_,AX
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mov gc_circl_cy_,DX
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xor DI,DI
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mov BP,SI
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EVEN
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@@LOOPTOP:
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call GC_CIRCL_PSET4
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cmp SI,DI
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je short @@SKIP
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xchg SI,DI
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call GC_CIRCL_PSET4
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xchg SI,DI
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@@SKIP:
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stc ; BP -= DI*2+1;
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sbb BP,DI ;
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sub BP,DI ;
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jns short @@LOOPCHECK
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dec SI ; --SI;
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add BP,SI ; BP += SI*2;
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add BP,SI ;
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@@LOOPCHECK:
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inc DI ; ++DI;
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cmp SI,DI
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jge short @@LOOPTOP
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MRETURN
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endfunc ; }
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; in:
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; SI = dx
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; DI = dy
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; break:
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; AX,BX,CX,DX
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;
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EVEN
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GC_CIRCL_PSET4Q proc near
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retn
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EVEN
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GC_CIRCL_PSET4Q endp
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GC_CIRCL_PSET4 proc near
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mov AX,gc_circl_cy_
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mov BX,DI
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shr BX,9 ; dummy
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org $-1
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GC_CIRCL_VRAMZOOM1 db ?
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or BX,BX
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jz short @@PS4
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sub AX,BX
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js short @@PS3
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cmp AX,ClipYH
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jg short GC_CIRCL_PSET4Q ; →描けるわけがない場合
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; AX = (cy_ - DI)
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; (cx_ + SI, AX)と (cx_ - SI, AX)に点を打つ
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mov DX,AX
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shl DX,2
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add DX,AX
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shl DX,4
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mov AX,gc_circl_cx_
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or SI,SI ; dxが 0 ならば 1 点のみ
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je short @@PS2
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sub AX,SI
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cmp AX,ClipXL
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jl short @@PS1
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cmp AX,ClipXR
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jg short GC_CIRCL_PSET4Q ; 左側の点が右端を越えているなら
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; 右側の点は描けるわけがない
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mov BX,AX
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mov CX,AX
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shr BX,3
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add BX,DX
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and CL,7
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mov CH,80h
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shr CH,CL
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mov ES:[BX],CH
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@@PS1:
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mov AX,gc_circl_cx_
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add AX,SI
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@@PS2:
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cmp AX,ClipXL
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jl short @@PS3
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cmp AX,ClipXR
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jg short @@PS3
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mov BX,AX
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mov CX,BX
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shr BX,3
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add BX,DX
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and CL,7
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mov CH,80h
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shr CH,CL
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mov ES:[BX],CH
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@@PS3:
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mov AX,gc_circl_cy_
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mov BX,DI
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shr BX,9 ; dummy
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org $-1
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GC_CIRCL_VRAMZOOM2 db ?
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add AX,BX
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@@PS4:
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cmp AX,ClipYH
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jae short @@PSQ
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; (cx_ + SI, AX)と (cx_ - SI, AX)に点を打つ
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mov DX,AX
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shl DX,2
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add DX,AX
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shl DX,4
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mov AX,gc_circl_cx_
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or SI,SI ; dxが 0 ならば 1 点のみ
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je short @@PS6
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sub AX,SI
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cmp AX,ClipXL
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jl short @@PS5
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cmp AX,ClipXR
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jg short @@PSQ ; 左側の点が右端を越えているなら
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; 右側の点は描けるわけがない
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mov BX,AX
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mov CX,AX
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shr BX,3
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add BX,DX
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and CL,7
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mov CH,80h
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shr CH,CL
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mov ES:[BX],CH
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@@PS5:
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mov AX,gc_circl_cx_
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add AX,SI
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@@PS6:
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cmp AX,ClipXL
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jl short @@PSQ
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cmp AX,ClipXR
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jg short @@PSQ
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mov BX,AX
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mov CX,BX
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shr BX,3
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add BX,DX
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and CL,7
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mov CH,80h
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shr CH,CL
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mov ES:[BX],CH
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@@PSQ:
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ret
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GC_CIRCL_PSET4 endp
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