From d23b5c21e100c075bf9b806cec45f0ad0f48301d Mon Sep 17 00:00:00 2001
From: Michal Idziorek <m.i@gmx.at>
Date: Sat, 23 Sep 2017 11:11:56 +0200
Subject: working on sound

---
 Makefile           |  3 ++-
 main.cpp           | 79 ++++++++++++++++++++++++++++++++++++++++++++++++++----
 shell_minimal.html |  2 +-
 3 files changed, 77 insertions(+), 7 deletions(-)

diff --git a/Makefile b/Makefile
index 70672a9..a5714ec 100644
--- a/Makefile
+++ b/Makefile
@@ -10,8 +10,9 @@ clean:
 	rm -f game
 	rm -f *.o
 	rm -f *.bc
+	rm -f lunatic_out.*
 
 browser-game:
 	emcc --std=c++11 -O2 World.cpp -o World.bc
 	emcc --std=c++11 -O2 main.cpp -o main.bc
-	emcc -O2 World.bc main.bc -o out.html -s USE_SDL=2 --preload-file coin.bmp --preload-file earth01.bmp --preload-file fonts.bmp --preload-file gridder01.bmp --preload-file guy01.bmp --preload-file guy02.bmp --preload-file gridder02.bmp --preload-file gridder03.bmp -s TOTAL_MEMORY=536870912 --shell-file shell_minimal.html
+	emcc -O2 World.bc main.bc -o lunatic_out.html -s USE_SDL=2 --preload-file coin.wav --preload-file coin.bmp --preload-file earth01.bmp --preload-file fonts.bmp --preload-file gridder01.bmp --preload-file guy01.bmp --preload-file guy02.bmp --preload-file gridder02.bmp --preload-file gridder03.bmp -s TOTAL_MEMORY=536870912 --shell-file shell_minimal.html
diff --git a/main.cpp b/main.cpp
index 42c547b..8fda90d 100644
--- a/main.cpp
+++ b/main.cpp
@@ -48,6 +48,57 @@ struct Context
 };
 
 
+static Uint32 wavLength;
+static Uint8 *wavBuffer;
+
+int sample=0;
+
+void audiomixer(void *userdata, Uint8 *stream, int len)
+{
+	int volume=15000;
+
+	for(int i=0;i<len;i++)
+	{
+		stream[i]=wavBuffer[sample];
+		if(sample>wavLength)stream[i]=0;
+		sample++;
+	}
+	return;
+
+    int samples = len / 4;
+    short *buf = (short*)stream;
+
+/*
+    for (i = 0; i < samples*2; i+=2)
+    {
+        buf[i]=buf[i+1] = volume*sin(sample*440/4410/2);
+	if((sample/44100)%2==1)buf[i]=buf[i+1]=0;
+	buf[i]+=volume*sin(sample*261/4410/2);
+	sample++;
+    }
+*/
+		
+
+}
+
+void show_AudioSpec(SDL_AudioSpec *as)
+{
+	std::cout << "freq: " << as->freq << std::endl;
+
+	std::cout << "bitsize: " << SDL_AUDIO_BITSIZE(as->format) << std::endl;
+	std::cout << "float: " << (bool)SDL_AUDIO_ISFLOAT(as->format) << std::endl;
+	std::cout << "bigendian: " << (bool)SDL_AUDIO_ISBIGENDIAN(as->format) << std::endl;
+	std::cout << "signed: " << (bool)SDL_AUDIO_ISSIGNED(as->format) << std::endl;
+	std::cout << "int: " << (bool)SDL_AUDIO_ISINT(as->format) << std::endl;
+	std::cout << "littleendian: " << (bool)SDL_AUDIO_ISLITTLEENDIAN(as->format) << std::endl;
+	std::cout << "unsigned: " << (bool)SDL_AUDIO_ISUNSIGNED(as->format) << std::endl;
+
+
+	std::cout << "channels: " << (int)as->channels << std::endl;
+	std::cout << "samples (buffer): " << as->samples << std::endl;
+	std::cout << "callback func: " << as->callback << std::endl;
+}
+
 // audio from http://www.brainybetty.com/soundsforpowerpoint2.htm
 // https://freesound.org/people/ProjectsU012/sounds/341695/
 void sdl_play_sound()
@@ -55,15 +106,32 @@ void sdl_play_sound()
 	
 	static bool first=true;
 	static SDL_AudioSpec wavSpec;
-	static Uint32 wavLength;
-	static Uint8 *wavBuffer;
 	static SDL_AudioDeviceID deviceId;
 	 
 	if (first)
 	{
-		SDL_LoadWAV("coin.wav", &wavSpec, &wavBuffer, &wavLength);
+		std::cout << "---desired load wav---" << std::endl;
+		show_AudioSpec(&wavSpec);
+
+		SDL_AudioSpec *spec=SDL_LoadWAV("coin.wav", &wavSpec, &wavBuffer, &wavLength);
+
+		std::cout << "---desired load wav---" << std::endl;
+		show_AudioSpec(&wavSpec);
+		std::cout << "---wav source data---" << std::endl;
+		if(spec==NULL)
+		{	
+		
+			std::cout << "SDL_LoadWavError: " << SDL_GetError() << std::endl;
+			exit(-1);
+		}
+		show_AudioSpec(spec);
 		// open most reasonable default device for playback. 
+		std::cout << "---" << std::endl;
+		wavSpec.callback = audiomixer;
 		deviceId = SDL_OpenAudioDevice(NULL, 0, &wavSpec, NULL, 0);
+		show_AudioSpec(&wavSpec);
+		std::cout << "---" << std::endl;
+
 		SDL_PauseAudioDevice(deviceId, 0);
 		first=false;
 	}
@@ -72,7 +140,7 @@ void sdl_play_sound()
 //	SDL_LoadWAV("music.wav", &wavSpec, &wavBuffer, &wavLength);
 //	SDL_LoadWAV("win.wav", &wavSpec, &wavBuffer, &wavLength);
 
-	int success = SDL_QueueAudio(deviceId, wavBuffer, wavLength);
+//	int success = SDL_QueueAudio(deviceId, wavBuffer, wavLength);
 #ifndef __EMSCRIPTEN__
 #endif
 
@@ -342,8 +410,8 @@ void main_loop(void *arg)
 		SDL_RenderPresent(ctx->ren);
 		if(ctx->world.player.collected_coin)
 		{	
-			sdl_play_sound();
 			ctx->world.player.collected_coin=false;
+			sample=0;
 		}
 
 		// progress world simu 
@@ -385,6 +453,7 @@ int main(int, char**){
 	ctx->show_tiles_back=ctx->win_width/ctx->show_tiles_size*0.25;
 	ctx->show_tiles_front=ctx->win_width/ctx->show_tiles_size*1;
 
+			sdl_play_sound();
 #ifdef __EMSCRIPTEN__
 
     int simulate_infinite_loop = 1;
diff --git a/shell_minimal.html b/shell_minimal.html
index 33a28b5..3f5a9ac 100644
--- a/shell_minimal.html
+++ b/shell_minimal.html
@@ -5,7 +5,7 @@
     <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
     <title>Emscripten-Generated Code</title>
     <style>
-	#output{display:none;}
+	#output{display:block;} 
       .emscripten { padding-right: 0; margin-left: auto; margin-right: auto; display: block; }
       textarea.emscripten { font-family: monospace; width: 80%; }
       div.emscripten { text-align: center; }
-- 
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