From 6d924e73db507826acbfd6b3015dee27a93d1f26 Mon Sep 17 00:00:00 2001
From: Josh Holtrop <jholtrop+git@gmail.com>
Date: Mon, 22 Feb 2010 06:02:44 +0000
Subject: [PATCH] working on audio support

git-svn-id: svn://anubis/anaglym/trunk@257 99a6e188-d820-4881-8870-2d33a10e2619
---
 Engine.cc |  3 +++
 Makefile  |  2 +-
 Video.cc  | 34 ++++++++++++++++++++++++++++++++++
 Video.h   |  1 +
 4 files changed, 39 insertions(+), 1 deletion(-)

diff --git a/Engine.cc b/Engine.cc
index 33c0119..0117ac4 100644
--- a/Engine.cc
+++ b/Engine.cc
@@ -888,6 +888,9 @@ void Engine::run()
                     case SDLK_F5:
                         reloadProgram();
                         break;
+                    case SDLK_F6:
+                        SDL_PauseAudio(0);
+                        break;
                     default:
                         key_down_event(event.key.keysym.sym);
                 }
diff --git a/Makefile b/Makefile
index 7e8a82e..1970eb6 100644
--- a/Makefile
+++ b/Makefile
@@ -28,7 +28,7 @@ FTGLINCLUDE := $(shell pkg-config --cflags ftgl)
 FTGLLIBS    := $(shell pkg-config --libs ftgl)
 
 SDLINCLUDE  := $(shell sdl-config --cflags)
-SDLLIBS     := $(shell sdl-config --libs) -lSDL_image
+SDLLIBS     := $(shell sdl-config --libs) -lSDL_image -lSDL_sound
 
 ODEINCLUDE  := $(shell ode-config --cflags)
 ODELIBS     := $(shell ode-config --libs)
diff --git a/Video.cc b/Video.cc
index d8f67ac..d997bce 100644
--- a/Video.cc
+++ b/Video.cc
@@ -4,8 +4,22 @@
 #include <GL/glu.h>
 #include <SDL.h>
 #include <iostream>
+#include <SDL_sound.h>
+#include <math.h>
 using namespace std;
 
+static void Video_sound_callback(void * userdata, Uint8 * stream, int len)
+{
+    static int pos = 0;
+    Sint16 * str = (Sint16 *) stream;
+    for (int i = 0; i < len / 4; i++)
+    {
+        str[i*2] = (Sint16) (32000.0 * sin(pos / 44100.0 * M_PI));
+        str[i*2+1] = 0;
+        pos++;
+    }
+}
+
 Video::Video()
 {
     if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO | SDL_INIT_TIMER))
@@ -30,6 +44,26 @@ Video::Video()
     m_surface = NULL;
     m_width = 0;
     m_height = 0;
+
+//    Sound_Init();
+    SDL_AudioSpec desired;
+    desired.freq = 44100;
+    desired.format = AUDIO_S16SYS;
+    desired.channels = 2;
+    desired.samples = 4096;
+    desired.callback = Video_sound_callback;
+    desired.userdata = this;
+    if (SDL_OpenAudio(&desired, NULL) < 0)
+    {
+        cerr << "Sound_OpenAudio() error." << endl;
+        exit(3);
+    }
+}
+
+Video::~Video()
+{
+    Sound_Quit();
+    SDL_Quit();
 }
 
 void Video::start(int width, int height, bool fullscreen, bool grab_input,
diff --git a/Video.h b/Video.h
index 0efc275..35172cf 100644
--- a/Video.h
+++ b/Video.h
@@ -8,6 +8,7 @@ class Video
 {
     public:
         Video();
+        ~Video();
         void start(int width = 0, int height = 0,
                    bool fullscreen = true, bool grab_input = true,
                    int samples = 4);