Use native endianness for sound output, rather than always LSB. Add PC

speaker code!

Subversion-branch: /trunk/chocolate-doom
Subversion-revision: 844

1 files changed, 114 insertions, 0 deletions

diff --git a/src/pcsound/pcsound.c b/src/pcsound/pcsound.c
new file mode 100644
index 00000000..9c18eb01
--- /dev/null
+++ b/src/pcsound/pcsound.c
@@ -0,0 +1,114 @@
+// Emacs style mode select   -*- C++ -*- 
+//-----------------------------------------------------------------------------
+//
+// Copyright(C) 2007 Simon Howard
+//
+// 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., 59 Temple Place - Suite 330, Boston, MA
+// 02111-1307, USA.
+//
+// DESCRIPTION:
+//    PC speaker interface.
+//
+//-----------------------------------------------------------------------------
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "pcsound.h"
+
+#ifdef _WIN32
+extern pcsound_driver_t pcsound_win32_driver;
+#endif
+extern pcsound_driver_t pcsound_sdl_driver;
+
+static pcsound_driver_t *drivers[] = 
+{
+#ifdef _WIN32
+    &pcsound_win32_driver,
+#endif
+    &pcsound_sdl_driver,
+    NULL,
+};
+
+static pcsound_driver_t *pcsound_driver = NULL;
+
+int PCSound_Init(pcsound_callback_func callback_func)
+{
+    char *driver_name;
+    int i;
+
+    if (pcsound_driver != NULL)
+    {
+        return 1;
+    }
+
+    // Check if the environment variable is set
+
+    driver_name = getenv("PCSOUND_DRIVER");
+
+    if (driver_name != NULL)
+    {
+        for (i=0; drivers[i] != NULL; ++i)
+        {
+            if (!strcasecmp(drivers[i]->name, driver_name))
+            {
+                // Found the driver!
+
+                if (drivers[i]->init_func(callback_func))
+                {
+                    pcsound_driver = drivers[i];
+                }
+                else
+                {
+                    printf("Failed to initialise PC sound driver: %s\n",
+                           drivers[i]->name);
+                    break;
+                }
+            }
+        }
+    }
+    else
+    {
+        // Try all drivers until we find a working one
+
+        for (i=0; drivers[i] != NULL; ++i)
+        {
+            if (drivers[i]->init_func(callback_func)) 
+            {
+                pcsound_driver = drivers[i];
+                break;
+            }
+        }
+    }
+    
+    if (pcsound_driver != NULL)
+    {
+        printf("Using PC sound driver: %s\n", pcsound_driver->name);
+        return 1;
+    }
+    else
+    {
+        printf("Failed to find a working PC sound driver.\n");
+        return 0;
+    }
+}
+
+void PCSound_Shutdown(void)
+{
+    pcsound_driver->shutdown_func();
+    pcsound_driver = NULL;
+}
+