10 files changed, 476 insertions, 0 deletions

diff --git a/src/contrib/SDL-3.2.20/examples/audio/01-simple-playback/README.txt b/src/contrib/SDL-3.2.20/examples/audio/01-simple-playback/README.txt
new file mode 100644
index 0000000..20ad059
--- /dev/null
+++ b/src/contrib/SDL-3.2.20/examples/audio/01-simple-playback/README.txt
@@ -0,0 +1,5 @@
+If you're running this in a web browser, you need to click the window before you'll hear anything!
+
+This example code creates a simple audio stream for playing sound, and
+generates a sine wave sound effect for it to play as time goes on. This is the
+simplest way to get up and running with procedural sound.
diff --git a/src/contrib/SDL-3.2.20/examples/audio/01-simple-playback/simple-playback.c b/src/contrib/SDL-3.2.20/examples/audio/01-simple-playback/simple-playback.c
new file mode 100644
index 0000000..15126e5
--- /dev/null
+++ b/src/contrib/SDL-3.2.20/examples/audio/01-simple-playback/simple-playback.c
@@ -0,0 +1,103 @@
+/*
+ * This example code creates a simple audio stream for playing sound, and
+ * generates a sine wave sound effect for it to play as time goes on. This
+ * is the simplest way to get up and running with procedural sound.
+ *
+ * This code is public domain. Feel free to use it for any purpose!
+ */
+
+#define SDL_MAIN_USE_CALLBACKS 1  /* use the callbacks instead of main() */
+#include <SDL3/SDL.h>
+#include <SDL3/SDL_main.h>
+
+/* We will use this renderer to draw into this window every frame. */
+static SDL_Window *window = NULL;
+static SDL_Renderer *renderer = NULL;
+static SDL_AudioStream *stream = NULL;
+static int current_sine_sample = 0;
+
+/* This function runs once at startup. */
+SDL_AppResult SDL_AppInit(void **appstate, int argc, char *argv[])
+{
+    SDL_AudioSpec spec;
+
+    SDL_SetAppMetadata("Example Audio Simple Playback", "1.0", "com.example.audio-simple-playback");
+
+    if (!SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO)) {
+        SDL_Log("Couldn't initialize SDL: %s", SDL_GetError());
+        return SDL_APP_FAILURE;
+    }
+
+    /* we don't _need_ a window for audio-only things but it's good policy to have one. */
+    if (!SDL_CreateWindowAndRenderer("examples/audio/simple-playback", 640, 480, 0, &window, &renderer)) {
+        SDL_Log("Couldn't create window/renderer: %s", SDL_GetError());
+        return SDL_APP_FAILURE;
+    }
+
+    /* We're just playing a single thing here, so we'll use the simplified option.
+       We are always going to feed audio in as mono, float32 data at 8000Hz.
+       The stream will convert it to whatever the hardware wants on the other side. */
+    spec.channels = 1;
+    spec.format = SDL_AUDIO_F32;
+    spec.freq = 8000;
+    stream = SDL_OpenAudioDeviceStream(SDL_AUDIO_DEVICE_DEFAULT_PLAYBACK, &spec, NULL, NULL);
+    if (!stream) {
+        SDL_Log("Couldn't create audio stream: %s", SDL_GetError());
+        return SDL_APP_FAILURE;
+    }
+
+    /* SDL_OpenAudioDeviceStream starts the device paused. You have to tell it to start! */
+    SDL_ResumeAudioStreamDevice(stream);
+
+    return SDL_APP_CONTINUE;  /* carry on with the program! */
+}
+
+/* This function runs when a new event (mouse input, keypresses, etc) occurs. */
+SDL_AppResult SDL_AppEvent(void *appstate, SDL_Event *event)
+{
+    if (event->type == SDL_EVENT_QUIT) {
+        return SDL_APP_SUCCESS;  /* end the program, reporting success to the OS. */
+    }
+    return SDL_APP_CONTINUE;  /* carry on with the program! */
+}
+
+/* This function runs once per frame, and is the heart of the program. */
+SDL_AppResult SDL_AppIterate(void *appstate)
+{
+    /* see if we need to feed the audio stream more data yet.
+       We're being lazy here, but if there's less than half a second queued, generate more.
+       A sine wave is unchanging audio--easy to stream--but for video games, you'll want
+       to generate significantly _less_ audio ahead of time! */
+    const int minimum_audio = (8000 * sizeof (float)) / 2;  /* 8000 float samples per second. Half of that. */
+    if (SDL_GetAudioStreamQueued(stream) < minimum_audio) {
+        static float samples[512];  /* this will feed 512 samples each frame until we get to our maximum. */
+        int i;
+
+        /* generate a 440Hz pure tone */
+        for (i = 0; i < SDL_arraysize(samples); i++) {
+            const int freq = 440;
+            const float phase = current_sine_sample * freq / 8000.0f;
+            samples[i] = SDL_sinf(phase * 2 * SDL_PI_F);
+            current_sine_sample++;
+        }
+
+        /* wrapping around to avoid floating-point errors */
+        current_sine_sample %= 8000;
+
+        /* feed the new data to the stream. It will queue at the end, and trickle out as the hardware needs more data. */
+        SDL_PutAudioStreamData(stream, samples, sizeof (samples));
+    }
+
+    /* we're not doing anything with the renderer, so just blank it out. */
+    SDL_RenderClear(renderer);
+    SDL_RenderPresent(renderer);
+
+    return SDL_APP_CONTINUE;  /* carry on with the program! */
+}
+
+/* This function runs once at shutdown. */
+void SDL_AppQuit(void *appstate, SDL_AppResult result)
+{
+    /* SDL will clean up the window/renderer for us. */
+}
+
diff --git a/src/contrib/SDL-3.2.20/examples/audio/02-simple-playback-callback/README.txt b/src/contrib/SDL-3.2.20/examples/audio/02-simple-playback-callback/README.txt
new file mode 100644
index 0000000..888ae34
--- /dev/null
+++ b/src/contrib/SDL-3.2.20/examples/audio/02-simple-playback-callback/README.txt
@@ -0,0 +1,5 @@
+If you're running this in a web browser, you need to click the window before you'll hear anything!
+
+This example code creates a simple audio stream for playing sound, and
+generates a sine wave sound effect for it to play as time goes on. Unlike
+the previous example, this uses a callback to generate sound.
diff --git a/src/contrib/SDL-3.2.20/examples/audio/02-simple-playback-callback/simple-playback-callback.c b/src/contrib/SDL-3.2.20/examples/audio/02-simple-playback-callback/simple-playback-callback.c
new file mode 100644
index 0000000..c011c72
--- /dev/null
+++ b/src/contrib/SDL-3.2.20/examples/audio/02-simple-playback-callback/simple-playback-callback.c
@@ -0,0 +1,115 @@
+/*
+ * This example code creates a simple audio stream for playing sound, and
+ * generates a sine wave sound effect for it to play as time goes on. Unlike
+ * the previous example, this uses a callback to generate sound.
+ *
+ * This might be the path of least resistance if you're moving an SDL2
+ * program's audio code to SDL3.
+ *
+ * This code is public domain. Feel free to use it for any purpose!
+ */
+
+#define SDL_MAIN_USE_CALLBACKS 1  /* use the callbacks instead of main() */
+#include <SDL3/SDL.h>
+#include <SDL3/SDL_main.h>
+
+/* We will use this renderer to draw into this window every frame. */
+static SDL_Window *window = NULL;
+static SDL_Renderer *renderer = NULL;
+static SDL_AudioStream *stream = NULL;
+static int current_sine_sample = 0;
+
+/* this function will be called (usually in a background thread) when the audio stream is consuming data. */
+static void SDLCALL FeedTheAudioStreamMore(void *userdata, SDL_AudioStream *astream, int additional_amount, int total_amount)
+{
+    /* total_amount is how much data the audio stream is eating right now, additional_amount is how much more it needs
+       than what it currently has queued (which might be zero!). You can supply any amount of data here; it will take what
+       it needs and use the extra later. If you don't give it enough, it will take everything and then feed silence to the
+       hardware for the rest. Ideally, though, we always give it what it needs and no extra, so we aren't buffering more
+       than necessary. */
+    additional_amount /= sizeof (float);  /* convert from bytes to samples */
+    while (additional_amount > 0) {
+        float samples[128];  /* this will feed 128 samples each iteration until we have enough. */
+        const int total = SDL_min(additional_amount, SDL_arraysize(samples));
+        int i;
+
+        /* generate a 440Hz pure tone */
+        for (i = 0; i < total; i++) {
+            const int freq = 440;
+            const float phase = current_sine_sample * freq / 8000.0f;
+            samples[i] = SDL_sinf(phase * 2 * SDL_PI_F);
+            current_sine_sample++;
+        }
+
+        /* wrapping around to avoid floating-point errors */
+        current_sine_sample %= 8000;
+
+        /* feed the new data to the stream. It will queue at the end, and trickle out as the hardware needs more data. */
+        SDL_PutAudioStreamData(astream, samples, total * sizeof (float));
+        additional_amount -= total;  /* subtract what we've just fed the stream. */
+    }
+}
+
+/* This function runs once at startup. */
+SDL_AppResult SDL_AppInit(void **appstate, int argc, char *argv[])
+{
+    SDL_AudioSpec spec;
+
+    SDL_SetAppMetadata("Example Simple Audio Playback Callback", "1.0", "com.example.audio-simple-playback-callback");
+
+    if (!SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO)) {
+        SDL_Log("Couldn't initialize SDL: %s", SDL_GetError());
+        return SDL_APP_FAILURE;
+    }
+
+    /* we don't _need_ a window for audio-only things but it's good policy to have one. */
+    if (!SDL_CreateWindowAndRenderer("examples/audio/simple-playback-callback", 640, 480, 0, &window, &renderer)) {
+        SDL_Log("Couldn't create window/renderer: %s", SDL_GetError());
+        return SDL_APP_FAILURE;
+    }
+
+    /* We're just playing a single thing here, so we'll use the simplified option.
+       We are always going to feed audio in as mono, float32 data at 8000Hz.
+       The stream will convert it to whatever the hardware wants on the other side. */
+    spec.channels = 1;
+    spec.format = SDL_AUDIO_F32;
+    spec.freq = 8000;
+    stream = SDL_OpenAudioDeviceStream(SDL_AUDIO_DEVICE_DEFAULT_PLAYBACK, &spec, FeedTheAudioStreamMore, NULL);
+    if (!stream) {
+        SDL_Log("Couldn't create audio stream: %s", SDL_GetError());
+        return SDL_APP_FAILURE;
+    }
+
+    /* SDL_OpenAudioDeviceStream starts the device paused. You have to tell it to start! */
+    SDL_ResumeAudioStreamDevice(stream);
+
+    return SDL_APP_CONTINUE;  /* carry on with the program! */
+}
+
+/* This function runs when a new event (mouse input, keypresses, etc) occurs. */
+SDL_AppResult SDL_AppEvent(void *appstate, SDL_Event *event)
+{
+    if (event->type == SDL_EVENT_QUIT) {
+        return SDL_APP_SUCCESS;  /* end the program, reporting success to the OS. */
+    }
+    return SDL_APP_CONTINUE;  /* carry on with the program! */
+}
+
+/* This function runs once per frame, and is the heart of the program. */
+SDL_AppResult SDL_AppIterate(void *appstate)
+{
+    /* we're not doing anything with the renderer, so just blank it out. */
+    SDL_RenderClear(renderer);
+    SDL_RenderPresent(renderer);
+
+    /* all the work of feeding the audio stream is happening in a callback in a background thread. */
+
+    return SDL_APP_CONTINUE;  /* carry on with the program! */
+}
+
+/* This function runs once at shutdown. */
+void SDL_AppQuit(void *appstate, SDL_AppResult result)
+{
+    /* SDL will clean up the window/renderer for us. */
+}
+
diff --git a/src/contrib/SDL-3.2.20/examples/audio/03-load-wav/README.txt b/src/contrib/SDL-3.2.20/examples/audio/03-load-wav/README.txt
new file mode 100644
index 0000000..57eb90c
--- /dev/null
+++ b/src/contrib/SDL-3.2.20/examples/audio/03-load-wav/README.txt
@@ -0,0 +1,5 @@
+If you're running this in a web browser, you need to click the window before you'll hear anything!
+
+This example code creates a simple audio stream for playing sound, and
+loads a .wav file that is pushed through the stream in a loop.
+
diff --git a/src/contrib/SDL-3.2.20/examples/audio/03-load-wav/load-wav.c b/src/contrib/SDL-3.2.20/examples/audio/03-load-wav/load-wav.c
new file mode 100644
index 0000000..c517e5d
--- /dev/null
+++ b/src/contrib/SDL-3.2.20/examples/audio/03-load-wav/load-wav.c
@@ -0,0 +1,103 @@
+/*
+ * This example code creates a simple audio stream for playing sound, and
+ * loads a .wav file that is pushed through the stream in a loop.
+ *
+ * This code is public domain. Feel free to use it for any purpose!
+ *
+ * The .wav file is a sample from Will Provost's song, The Living Proof,
+ * used with permission.
+ *
+ *    From the album The Living Proof
+ *    Publisher: 5 Guys Named Will
+ *    Copyright 1996 Will Provost
+ *    https://itunes.apple.com/us/album/the-living-proof/id4153978
+ *    http://www.amazon.com/The-Living-Proof-Will-Provost/dp/B00004R8RH
+ */
+
+#define SDL_MAIN_USE_CALLBACKS 1  /* use the callbacks instead of main() */
+#include <SDL3/SDL.h>
+#include <SDL3/SDL_main.h>
+
+/* We will use this renderer to draw into this window every frame. */
+static SDL_Window *window = NULL;
+static SDL_Renderer *renderer = NULL;
+static SDL_AudioStream *stream = NULL;
+static Uint8 *wav_data = NULL;
+static Uint32 wav_data_len = 0;
+
+/* This function runs once at startup. */
+SDL_AppResult SDL_AppInit(void **appstate, int argc, char *argv[])
+{
+    SDL_AudioSpec spec;
+    char *wav_path = NULL;
+
+    SDL_SetAppMetadata("Example Audio Load Wave", "1.0", "com.example.audio-load-wav");
+
+    if (!SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO)) {
+        SDL_Log("Couldn't initialize SDL: %s", SDL_GetError());
+        return SDL_APP_FAILURE;
+    }
+
+    /* we don't _need_ a window for audio-only things but it's good policy to have one. */
+    if (!SDL_CreateWindowAndRenderer("examples/audio/load-wav", 640, 480, 0, &window, &renderer)) {
+        SDL_Log("Couldn't create window/renderer: %s", SDL_GetError());
+        return SDL_APP_FAILURE;
+    }
+
+    /* Load the .wav file from wherever the app is being run from. */
+    SDL_asprintf(&wav_path, "%ssample.wav", SDL_GetBasePath());  /* allocate a string of the full file path */
+    if (!SDL_LoadWAV(wav_path, &spec, &wav_data, &wav_data_len)) {
+        SDL_Log("Couldn't load .wav file: %s", SDL_GetError());
+        return SDL_APP_FAILURE;
+    }
+
+    SDL_free(wav_path);  /* done with this string. */
+
+    /* Create our audio stream in the same format as the .wav file. It'll convert to what the audio hardware wants. */
+    stream = SDL_OpenAudioDeviceStream(SDL_AUDIO_DEVICE_DEFAULT_PLAYBACK, &spec, NULL, NULL);
+    if (!stream) {
+        SDL_Log("Couldn't create audio stream: %s", SDL_GetError());
+        return SDL_APP_FAILURE;
+    }
+
+    /* SDL_OpenAudioDeviceStream starts the device paused. You have to tell it to start! */
+    SDL_ResumeAudioStreamDevice(stream);
+
+    return SDL_APP_CONTINUE;  /* carry on with the program! */
+}
+
+/* This function runs when a new event (mouse input, keypresses, etc) occurs. */
+SDL_AppResult SDL_AppEvent(void *appstate, SDL_Event *event)
+{
+    if (event->type == SDL_EVENT_QUIT) {
+        return SDL_APP_SUCCESS;  /* end the program, reporting success to the OS. */
+    }
+    return SDL_APP_CONTINUE;  /* carry on with the program! */
+}
+
+/* This function runs once per frame, and is the heart of the program. */
+SDL_AppResult SDL_AppIterate(void *appstate)
+{
+    /* see if we need to feed the audio stream more data yet.
+       We're being lazy here, but if there's less than the entire wav file left to play,
+       just shove a whole copy of it into the queue, so we always have _tons_ of
+       data queued for playback. */
+    if (SDL_GetAudioStreamQueued(stream) < (int)wav_data_len) {
+        /* feed more data to the stream. It will queue at the end, and trickle out as the hardware needs more data. */
+        SDL_PutAudioStreamData(stream, wav_data, wav_data_len);
+    }
+
+    /* we're not doing anything with the renderer, so just blank it out. */
+    SDL_RenderClear(renderer);
+    SDL_RenderPresent(renderer);
+
+    return SDL_APP_CONTINUE;  /* carry on with the program! */
+}
+
+/* This function runs once at shutdown. */
+void SDL_AppQuit(void *appstate, SDL_AppResult result)
+{
+    SDL_free(wav_data);  /* strictly speaking, this isn't necessary because the process is ending, but it's good policy. */
+    /* SDL will clean up the window/renderer for us. */
+}
+
diff --git a/src/contrib/SDL-3.2.20/examples/audio/04-multiple-streams/README.txt b/src/contrib/SDL-3.2.20/examples/audio/04-multiple-streams/README.txt
new file mode 100644
index 0000000..9ef2275
--- /dev/null
+++ b/src/contrib/SDL-3.2.20/examples/audio/04-multiple-streams/README.txt
@@ -0,0 +1,5 @@
+If you're running this in a web browser, you need to click the window before you'll hear anything!
+
+This example code loads two .wav files, puts them an audio streams and binds
+them for playback, repeating both sounds on loop. This shows several streams
+mixing into a single playback device.
diff --git a/src/contrib/SDL-3.2.20/examples/audio/04-multiple-streams/multiple-streams.c b/src/contrib/SDL-3.2.20/examples/audio/04-multiple-streams/multiple-streams.c
new file mode 100644
index 0000000..8d3bfaa
--- /dev/null
+++ b/src/contrib/SDL-3.2.20/examples/audio/04-multiple-streams/multiple-streams.c
@@ -0,0 +1,135 @@
+/*
+ * This example code loads two .wav files, puts them an audio streams and
+ * binds them for playback, repeating both sounds on loop. This shows several
+ * streams mixing into a single playback device.
+ *
+ * This code is public domain. Feel free to use it for any purpose!
+ */
+
+#define SDL_MAIN_USE_CALLBACKS 1  /* use the callbacks instead of main() */
+#include <SDL3/SDL.h>
+#include <SDL3/SDL_main.h>
+
+/* We will use this renderer to draw into this window every frame. */
+static SDL_Window *window = NULL;
+static SDL_Renderer *renderer = NULL;
+static SDL_AudioDeviceID audio_device = 0;
+
+/* things that are playing sound (the audiostream itself, plus the original data, so we can refill to loop. */
+typedef struct Sound {
+    Uint8 *wav_data;
+    Uint32 wav_data_len;
+    SDL_AudioStream *stream;
+} Sound;
+
+static Sound sounds[2];
+
+static bool init_sound(const char *fname, Sound *sound)
+{
+    bool retval = false;
+    SDL_AudioSpec spec;
+    char *wav_path = NULL;
+
+    /* Load the .wav files from wherever the app is being run from. */
+    SDL_asprintf(&wav_path, "%s%s", SDL_GetBasePath(), fname);  /* allocate a string of the full file path */
+    if (!SDL_LoadWAV(wav_path, &spec, &sound->wav_data, &sound->wav_data_len)) {
+        SDL_Log("Couldn't load .wav file: %s", SDL_GetError());
+        return false;
+    }
+
+    /* Create an audio stream. Set the source format to the wav's format (what
+       we'll input), leave the dest format NULL here (it'll change to what the
+       device wants once we bind it). */
+    sound->stream = SDL_CreateAudioStream(&spec, NULL);
+    if (!sound->stream) {
+        SDL_Log("Couldn't create audio stream: %s", SDL_GetError());
+    } else if (!SDL_BindAudioStream(audio_device, sound->stream)) {  /* once bound, it'll start playing when there is data available! */
+        SDL_Log("Failed to bind '%s' stream to device: %s", fname, SDL_GetError());
+    } else {
+        retval = true;  /* success! */
+    }
+
+    SDL_free(wav_path);  /* done with this string. */
+    return retval;
+}
+
+
+/* This function runs once at startup. */
+SDL_AppResult SDL_AppInit(void **appstate, int argc, char *argv[])
+{
+
+    SDL_SetAppMetadata("Example Audio Multiple Streams", "1.0", "com.example.audio-multiple-streams");
+
+    if (!SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO)) {
+        SDL_Log("Couldn't initialize SDL: %s", SDL_GetError());
+        return SDL_APP_FAILURE;
+    }
+
+    if (!SDL_CreateWindowAndRenderer("examples/audio/multiple-streams", 640, 480, 0, &window, &renderer)) {
+        SDL_Log("Couldn't create window/renderer: %s", SDL_GetError());
+        return SDL_APP_FAILURE;
+    }
+
+    /* open the default audio device in whatever format it prefers; our audio streams will adjust to it. */
+    audio_device = SDL_OpenAudioDevice(SDL_AUDIO_DEVICE_DEFAULT_PLAYBACK, NULL);
+    if (audio_device == 0) {
+        SDL_Log("Couldn't open audio device: %s", SDL_GetError());
+        return SDL_APP_FAILURE;
+    }
+
+    if (!init_sound("sample.wav", &sounds[0])) {
+        return SDL_APP_FAILURE;
+    } else if (!init_sound("sword.wav", &sounds[1])) {
+        return SDL_APP_FAILURE;
+    }
+
+    return SDL_APP_CONTINUE;  /* carry on with the program! */
+}
+
+/* This function runs when a new event (mouse input, keypresses, etc) occurs. */
+SDL_AppResult SDL_AppEvent(void *appstate, SDL_Event *event)
+{
+    if (event->type == SDL_EVENT_QUIT) {
+        return SDL_APP_SUCCESS;  /* end the program, reporting success to the OS. */
+    }
+    return SDL_APP_CONTINUE;  /* carry on with the program! */
+}
+
+/* This function runs once per frame, and is the heart of the program. */
+SDL_AppResult SDL_AppIterate(void *appstate)
+{
+    int i;
+
+    for (i = 0; i < SDL_arraysize(sounds); i++) {
+        /* If less than a full copy of the audio is queued for playback, put another copy in there.
+           This is overkill, but easy when lots of RAM is cheap. One could be more careful and
+           queue less at a time, as long as the stream doesn't run dry.  */
+        if (SDL_GetAudioStreamQueued(sounds[i].stream) < ((int) sounds[i].wav_data_len)) {
+            SDL_PutAudioStreamData(sounds[i].stream, sounds[i].wav_data, (int) sounds[i].wav_data_len);
+        }
+    }
+
+    /* just blank the screen. */
+    SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
+    SDL_RenderClear(renderer);
+    SDL_RenderPresent(renderer);
+
+    return SDL_APP_CONTINUE;  /* carry on with the program! */
+}
+
+/* This function runs once at shutdown. */
+void SDL_AppQuit(void *appstate, SDL_AppResult result)
+{
+    int i;
+
+    SDL_CloseAudioDevice(audio_device);
+
+    for (i = 0; i < SDL_arraysize(sounds); i++) {
+        if (sounds[i].stream) {
+            SDL_DestroyAudioStream(sounds[i].stream);
+        }
+        SDL_free(sounds[i].wav_data);
+    }
+
+    /* SDL will clean up the window/renderer for us. */
+}
diff --git a/src/contrib/SDL-3.2.20/examples/audio/onmouseover.webp b/src/contrib/SDL-3.2.20/examples/audio/onmouseover.webp
new file mode 100644
index 0000000..1f3ba4b
--- /dev/null
+++ b/src/contrib/SDL-3.2.20/examples/audio/onmouseover.webp
diff --git a/src/contrib/SDL-3.2.20/examples/audio/thumbnail.png b/src/contrib/SDL-3.2.20/examples/audio/thumbnail.png
new file mode 100644
index 0000000..10bc6c8
--- /dev/null
+++ b/src/contrib/SDL-3.2.20/examples/audio/thumbnail.png