mirror of https://github.com/nmlgc/ReC98.git
69 lines
1.1 KiB
NASM
69 lines
1.1 KiB
NASM
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; master library - PC-9801
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;
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; Description:
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; VSYNC(VBLANK)開始待ち
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;
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; Function/Procedures:
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; void vsync_wait(void) ;
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;
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; Parameters:
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; none
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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-9801
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;
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; Requiring Resources:
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; CPU: 8086
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;
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; Notes:
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; 割り込み禁止状態で呼び出すとハングアップの恐れがあります。
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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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; 92/11/21 Initial: vsync.asm
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; 93/ 8/ 8 Initial: vsyncwai.asm/master.lib 0.20
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func VSYNC_WAIT ; vsync_wait() {
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cmp vsync_OldMask,0
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jnz short @@USING_INT
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; VBLANKの立ち上がりを待つ
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@@RUNNING:
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jmp short $+2
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jmp short $+2
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in AL,0a0h
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test AL,20h
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jnz short @@RUNNING
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@@SLEEPING:
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jmp short $+2
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jmp short $+2
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in AL,0a0h
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test AL,20h
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jz short @@SLEEPING
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ret
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; Windowsではポート監視だと正しく読み取れないため、
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; 割り込みを使っていればそちらを優先する。
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@@USING_INT:
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mov AX,vsync_Count1
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@@INT_WAIT:
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cmp AX,vsync_Count1
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je short @@INT_WAIT
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ret
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endfunc ; }
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