OpenTTD-patches/w32dm2.cpp

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/*********************************************************************
* OpenTTD: An Open Source Transport Tycoon Deluxe clone *
* Copyright (c) 2002-2004 OpenTTD Developers. All Rights Reserved. *
* *
* Web site: http://openttd.sourceforge.net/ *
*********************************************************************/
/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/* DirectMusic driver for Win32 */
/* Based on dxmci from TTDPatch */
#include "stdafx.h"
#ifdef WIN32_ENABLE_DIRECTMUSIC_SUPPORT
// for gcc, the GUIDs are available in a library instead
#ifndef __GNUC__
#define INITGUID
#endif
#ifdef __cplusplus
extern "C" {
#endif
#include "ttd.h"
#include "sound.h"
#include "hal.h"
#ifdef __cplusplus
}
#endif
#include <windows.h>
#include <stdio.h>
#include <dmksctrl.h>
#include <dmusici.h>
#include <dmusicc.h>
#include <dmusicf.h>
#define VARIANT int
#define MSGBOX(output) DEBUG(misc, 0) ("DirectMusic driver: %s\n", output); //MessageBox(NULL, output, "dxmci",MB_OK);
#define MULTI_TO_WIDE( x,y ) MultiByteToWideChar( CP_ACP,MB_PRECOMPOSED, y,-1,x,_MAX_PATH);
// the performance object controls manipulation of the segments
IDirectMusicPerformance *performance = NULL;
// the segment object is where the MIDI data is stored for playback
IDirectMusicSegment *segment = NULL;
// the loader bject can load many types of DMusic related files
IDirectMusicLoader *loader = NULL;
// whether we've initialized COM or not (when deciding whether to shut down)
int COMInitialized = 0;
extern "C" bool LoadLibraryList(void **proc, const char *dll);
// Use lazy linking
struct ProcPtrs {
unsigned long (WINAPI *CoCreateInstance)(REFCLSID rclsid, LPUNKNOWN pUnkOuter, DWORD dwClsContext, REFIID riid, LPVOID * ppv);
HRESULT (WINAPI *CoInitialize)( LPVOID pvReserved );
void (WINAPI *CoUninitialize)( );
};
#define M(x) x "\0"
static const char ole_files[] =
M("ole32.dll")
M("CoCreateInstance")
M("CoInitialize")
M("CoUninitialize")
M("")
;
#undef M
static ProcPtrs _proc;
static bool LoadOleDLL()
{
if (_proc.CoCreateInstance != NULL)
return true;
if (!LoadLibraryList((void**)&_proc, ole_files))
return false;
return true;
}
#ifdef __cplusplus
extern "C" {
#endif
// Initialize COM and DirectMusic
bool InitDirectMusic (void)
{
if (NULL != performance)
return true;
// Initialize COM
if (!COMInitialized) {
if (!LoadOleDLL()) {
MSGBOX("ole32.dll load failed");
return false;
}
_proc.CoInitialize(NULL);
COMInitialized = 1;
}
// Create the performance object via CoCreateInstance
if (FAILED(_proc.CoCreateInstance(
(REFCLSID)CLSID_DirectMusicPerformance,
NULL,
CLSCTX_INPROC,
(REFIID)IID_IDirectMusicPerformance,
(LPVOID *)&performance))) {
MSGBOX ("Failed to create the performance object");
return false;
}
// Initialize it
if (FAILED(performance->Init(NULL, NULL, NULL))) {
MSGBOX("Failed to initialize performance object");
return false;
}
// Choose default Windows synth
if (FAILED(performance->AddPort (NULL))) {
MSGBOX("AddPort failed");
return false;
}
// now we'll create the loader object. This will be used to load the
// midi file for our demo. Again, we need to use CoCreateInstance
// and pass the appropriate ID parameters
if (FAILED(_proc.CoCreateInstance((REFCLSID)CLSID_DirectMusicLoader,
NULL, CLSCTX_INPROC,
(REFIID)IID_IDirectMusicLoader,
(LPVOID *)&loader))) {
MSGBOX("Failed to create loader object");
return false;
}
// that's it for initialization. If we made it this far we
// were successful.
return true;
}
// Releases memory used by all of the initialized
// DirectMusic objects in the program
void ReleaseSegment (void)
{
if (NULL != segment) {
segment->Release ();
segment = NULL;
}
}
void ShutdownDirectMusic (void)
{
// release everything but the segment, which the performance
// will release automatically (and it'll crash if it's been
// released already)
if (NULL != loader) {
loader->Release ();
loader = NULL;
}
if (NULL != performance)
{
performance->CloseDown ();
performance->Release ();
performance = NULL;
}
if (COMInitialized) {
_proc.CoUninitialize();
COMInitialized = 0;
}
}
// Load MIDI file for playing
bool LoadMIDI (char *directory, char *filename)
{
DMUS_OBJECTDESC obj_desc;
WCHAR w_directory[_MAX_PATH]; // utf-16 version of the directory name.
WCHAR w_filename[_MAX_PATH]; // utf-16 version of the file name
if (NULL == performance)
return false;
MULTI_TO_WIDE(w_directory,directory);
if (FAILED(loader->SetSearchDirectory((REFGUID) GUID_DirectMusicAllTypes,
w_directory, FALSE))) {
MSGBOX("LoadMIDI: SetSearchDirectory failed");
return false;
}
// set up the loader object info
ZeroMemory (&obj_desc, sizeof (obj_desc));
obj_desc.dwSize = sizeof (obj_desc);
MULTI_TO_WIDE(w_filename,filename);
obj_desc.guidClass = CLSID_DirectMusicSegment;
wcscpy (obj_desc.wszFileName,w_filename);
obj_desc.dwValidData = DMUS_OBJ_CLASS | DMUS_OBJ_FILENAME;
// release the existing segment if we have any
if (NULL != segment)
ReleaseSegment();
// and make a new segment
if (FAILED(loader->GetObject(&obj_desc,
(REFIID)IID_IDirectMusicSegment,
(LPVOID *) &segment))) {
MSGBOX("LoadMIDI: Get object failed");
return FALSE;
}
// next we need to tell the segment what kind of data it contains. We do this
// with the IDirectMusicSegment::SetParam function.
if (FAILED(segment->SetParam((REFGUID)GUID_StandardMIDIFile,
-1, 0, 0, (LPVOID)performance))) {
MSGBOX("LoadMIDI: SetParam (MIDI file) failed");
return false;
}
// finally, we need to tell the segment to 'download' the instruments
if (FAILED(segment->SetParam((REFGUID)GUID_Download,
-1, 0, 0, (LPVOID)performance))) {
MSGBOX("LoadMIDI: Failed to download instruments");
return false;
}
// at this point, the MIDI file is loaded and ready to play!
return true;
}
// Start playing the MIDI file
void PlaySegment (void)
{
if (NULL == performance)
return;
if (FAILED(performance->PlaySegment(segment, 0, 0, NULL))) {
MSGBOX("PlaySegment failed");
}
}
// Stop playing
void StopSegment (void)
{
if (NULL == performance || NULL == segment)
return;
if (FAILED(performance->Stop(segment, NULL, 0, 0))) {
MSGBOX("StopSegment failed");
}
}
// Find out whether playing has started or stopped
bool IsSegmentPlaying (void)
{
if (NULL == performance || NULL == segment)
return FALSE;
// IsPlaying return S_OK if the segment is currently playing
return performance->IsPlaying(segment, NULL) == S_OK ? TRUE : FALSE;
}
void SetVolume(long vol)
{
long db;
if (performance == NULL && !InitDirectMusic())
return;
db = ((vol >> 21) & 0x7ff) - 1000;
performance->SetGlobalParam(GUID_PerfMasterVolume, &db, sizeof(db));
}
#if defined(__cplusplus)
}
#endif
#endif // WIN32_ENABLE_DIRECTMUSIC_SUPPORT