mirror of https://github.com/nmlgc/ReC98.git
120 lines
1.7 KiB
NASM
120 lines
1.7 KiB
NASM
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; master library - PC-9801
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;
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; Description:
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; グラフィック画面の内容を他のページから複写する
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;
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; Function/Procedures:
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; int pascal graph_copy_page( int to_page ) ;
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;
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; Parameters:
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; to_page 転送先( 0 or 1 )
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;
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; Returns:
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; int 0(FALSE) 失敗(メモリ不足)
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; 1(TRUE) 成功
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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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;
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; Notes:
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; 実行後、アクセスページが to_page になります。
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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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; 92/ 2/ 4 Initial
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; 93/ 3/21 smem_wget使用
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; 93/ 3/29 bugfix
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; 95/ 3/20 [M0.22k] 安全のため開始時にgrcg_offを入れた
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APAGE equ 0a6h
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; copy a plane
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; in:
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; AL = vram pageの反対
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; BX = from seg
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; DX = to seg
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; CX = word number of vram size
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; dflag = 0
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; break:
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; AL は反対になります( 0<->1 )
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; BX <-> DX
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; SI,DI,DS,ES
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copy_plane proc near
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xor AL,1
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out APAGE,AL
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mov DS,BX
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mov ES,DX
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xor DI,DI
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mov SI,DI
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rep movsw
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mov CX,DI
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shr CX,1
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xchg BX,DX
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ret
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copy_plane endp
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;
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func GRAPH_COPY_PAGE ; graph_copy_page() {
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xor DX,DX
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mov CX,graph_VramWords
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mov BX,CX
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shl BX,1
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push BX
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nopcall SMEM_WGET
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xchg AX,DX
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jc short @@ERROR
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xor AL,AL ; GRCG OFF
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out 7ch,AL
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; 引数
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G_TO_PAGE = RETSIZE * 2
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mov BX,SP
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mov AX,SS:[BX+G_TO_PAGE]
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and AL,1
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push SI
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push DI
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push DS
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mov BX,0a800H
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call copy_plane ; from
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call copy_plane ; to
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mov BX,0b000H
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call copy_plane ; from
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call copy_plane ; to
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mov BX,0b800H
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call copy_plane ; from
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call copy_plane ; to
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mov BX,0e000H
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call copy_plane ; from
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call copy_plane ; to
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@@OWARI:
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pop DS
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pop DI
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pop SI
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push DX
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nopcall SMEM_RELEASE
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mov AX,1
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@@ERROR:
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ret 2
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endfunc ; }
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