495694da29
When the tempo is changed, the times on all active timers must be adjusted to match the new timing values. Add an API to do this and invoke it when a tempo change meta event is read.
192 lines
3.7 KiB
C
192 lines
3.7 KiB
C
//
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// Copyright(C) 2005-2014 Simon Howard
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License
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// as published by the Free Software Foundation; either version 2
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// of the License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// DESCRIPTION:
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// OPL Win32 native interface.
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//
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#include "config.h"
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#ifdef _WIN32
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#include <stdio.h>
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#define WIN32_LEAN_AND_MEAN
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#include <windows.h>
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#include "opl.h"
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#include "opl_internal.h"
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#include "opl_timer.h"
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#include "ioperm_sys.h"
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static unsigned int opl_port_base;
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// MingW?
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#if defined(__GNUC__) && defined(__i386__)
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static unsigned int OPL_Win32_PortRead(opl_port_t port)
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{
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unsigned char result;
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__asm__ volatile (
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"movl %1, %%edx\n"
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"inb %%dx, %%al\n"
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"movb %%al, %0"
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: "=m" (result)
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: "r" (opl_port_base + port)
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: "edx", "al", "memory"
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);
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return result;
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}
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static void OPL_Win32_PortWrite(opl_port_t port, unsigned int value)
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{
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__asm__ volatile (
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"movl %0, %%edx\n"
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"movb %1, %%al\n"
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"outb %%al, %%dx"
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:
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: "r" (opl_port_base + port), "r" ((unsigned char) value)
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: "edx", "al"
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);
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}
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// haleyjd 20110417: MSVC version
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#elif defined(_MSC_VER) && defined(_M_IX86)
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static unsigned int OPL_Win32_PortRead(opl_port_t port)
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{
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unsigned char result;
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opl_port_t dst_port = opl_port_base + port;
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__asm
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{
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mov edx, dword ptr [dst_port]
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in al, dx
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mov byte ptr [result], al
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}
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return result;
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}
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static void OPL_Win32_PortWrite(opl_port_t port, unsigned int value)
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{
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opl_port_t dst_port = opl_port_base + port;
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__asm
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{
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mov edx, dword ptr [dst_port]
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mov al, byte ptr [value]
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out dx, al
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}
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}
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#else
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// Not x86, or don't know how to do port R/W on this compiler.
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#define NO_PORT_RW
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static unsigned int OPL_Win32_PortRead(opl_port_t port)
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{
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return 0;
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}
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static void OPL_Win32_PortWrite(opl_port_t port, unsigned int value)
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{
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}
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#endif
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static int OPL_Win32_Init(unsigned int port_base)
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{
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#ifndef NO_PORT_RW
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OSVERSIONINFO version_info;
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opl_port_base = port_base;
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// Check the OS version.
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memset(&version_info, 0, sizeof(version_info));
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version_info.dwOSVersionInfoSize = sizeof(version_info);
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GetVersionEx(&version_info);
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// On NT-based systems, we must acquire I/O port permissions
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// using the ioperm.sys driver.
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if (version_info.dwPlatformId == VER_PLATFORM_WIN32_NT)
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{
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// Install driver.
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if (!IOperm_InstallDriver())
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{
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return 0;
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}
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// Open port range.
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if (!IOperm_EnablePortRange(opl_port_base, 2, 1))
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{
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IOperm_UninstallDriver();
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return 0;
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}
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}
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// Start callback thread
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if (!OPL_Timer_StartThread())
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{
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IOperm_UninstallDriver();
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return 0;
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}
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return 1;
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#endif
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return 0;
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}
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static void OPL_Win32_Shutdown(void)
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{
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// Stop callback thread
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OPL_Timer_StopThread();
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// Unload IOperm library.
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IOperm_UninstallDriver();
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}
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opl_driver_t opl_win32_driver =
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{
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"Win32",
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OPL_Win32_Init,
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OPL_Win32_Shutdown,
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OPL_Win32_PortRead,
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OPL_Win32_PortWrite,
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OPL_Timer_SetCallback,
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OPL_Timer_ClearCallbacks,
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OPL_Timer_Lock,
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OPL_Timer_Unlock,
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OPL_Timer_SetPaused,
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OPL_Timer_AdjustCallbacks,
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};
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#endif /* #ifdef _WIN32 */
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