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main: Added _optional_ callback entry points.

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This lets apps optionally have a handful of callbacks for their entry points instead of a single main function. If used, the actual main/SDL_main/whatever entry point will be implemented in the single-header library SDL_main.h and the app will implement four separate functions:

First:

    int SDL_AppInit(int argc, char **argv);

This will be called once before anything else. argc/argv work like they always do. If this returns 0, the app runs. If it returns < 0, the app calls SDL_AppQuit and terminates with an exit code that reports an error to the platform. If it returns > 0, the app calls SDL_AppQuit and terminates with an exit code that reports success to the platform. This function should not go into an infinite mainloop; it should do any one-time startup it requires and then return.

Then:

     int SDL_AppIterate(void);

This is called over and over, possibly at the refresh rate of the display or some other metric that the platform dictates. This is where the heart of your app runs. It should return as quickly as reasonably possible, but it's not a "run one memcpy and that's all the time you have" sort of thing. The app should do any game updates, and render a frame of video. If it returns < 0, SDL will call SDL_AppQuit and terminate the process with an exit code that reports an error to the platform. If it returns > 0, the app calls SDL_AppQuit and terminates with an exit code that reports success to the platform. If it returns 0, then SDL_AppIterate will be called again at some regular frequency. The platform may choose to run this more or less (perhaps less in the background, etc), or it might just call this function in a loop as fast as possible. You do not check the event queue in this function (SDL_AppEvent exists for that).

Next:

    int SDL_AppEvent(const SDL_Event *event);

This will be called once for each event pushed into the SDL queue. This may be called from any thread, and possibly in parallel to SDL_AppIterate. The fields in event do not need to be free'd (as you would normally need to do for SDL_EVENT_DROP_FILE, etc), and your app should not call SDL_PollEvent, SDL_PumpEvent, etc, as SDL will manage this for you. Return values are the same as from SDL_AppIterate(), so you can terminate in response to SDL_EVENT_QUIT, etc.

Finally:

    void SDL_AppQuit(void);

This is called once before terminating the app--assuming the app isn't being forcibly killed or crashed--as a last chance to clean up. After this returns, SDL will call SDL_Quit so the app doesn't have to (but it's safe for the app to call it, too). Process termination proceeds as if the app returned normally from main(), so atexit handles will run, if your platform supports that.

The app does not implement SDL_main if using this. To turn this on, define SDL_MAIN_USE_CALLBACKS before including SDL_main.h. Defines like SDL_MAIN_HANDLED and SDL_MAIN_NOIMPL are also respected for callbacks, if the app wants to do some sort of magic main implementation thing.

In theory, on most platforms these can be implemented in the app itself, but this saves some #ifdefs in the app and lets everyone struggle less against some platforms, and might be more efficient in the long run, too.

On some platforms, it's possible this is the only reasonable way to go, but we haven't actually hit one that 100% requires it yet (but we will, if we want to write a RetroArch backend, for example).

Using the callback entry points works on every platform, because on platforms that don't require them, we can fake them with a simple loop in an internal implementation of the usual SDL_main.

The primary way we expect people to write SDL apps is with SDL_main, and this is not intended to replace it. If the app chooses to use this, it just removes some platform-specific details they might have to otherwise manage, and maybe removes a barrier to entry on some future platform.

Fixes #6785.
Reference PR #8247.
This commit is contained in:
Ryan C. Gordon
2023-11-01 18:40:41 -04:00
committed by GitHub
parent 9323417e9c
commit 9c664b0062
26 changed files with 1155 additions and 529 deletions
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539
test/testaudio.c
View File

@@ -1,9 +1,4 @@
#include <stdlib.h>
#ifdef __EMSCRIPTEN__
#include <emscripten/emscripten.h>
#endif
#define SDL_MAIN_USE_CALLBACKS 1
#include <SDL3/SDL_test.h>
#include <SDL3/SDL_test_common.h>
#include <SDL3/SDL_main.h>
@@ -103,7 +98,6 @@ struct Thing
static Uint64 app_ready_ticks = 0;
static int done = 0;
static SDLTest_CommonState *state = NULL;
static Thing *things = NULL;
@@ -124,51 +118,6 @@ static Texture *trashcan_texture = NULL;
static Texture *soundboard_texture = NULL;
static Texture *soundboard_levels_texture = NULL;
static void DestroyTexture(Texture *tex);
static void DestroyThing(Thing *thing);
/* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
static void Quit(int rc)
{
while (things != NULL) {
DestroyThing(things); /* make sure all the audio devices are closed, etc. */
}
DestroyTexture(physdev_texture);
DestroyTexture(logdev_texture);
DestroyTexture(audio_texture);
DestroyTexture(trashcan_texture);
DestroyTexture(soundboard_texture);
DestroyTexture(soundboard_levels_texture);
SDLTest_CommonQuit(state);
/* Let 'main()' return normally */
if (rc != 0) {
exit(rc);
}
}
static char *xstrdup(const char *str)
{
char *ptr = SDL_strdup(str);
if (!ptr) {
SDL_Log("Out of memory!");
Quit(1);
}
return ptr;
}
static void *xalloc(const size_t len)
{
void *ptr = SDL_calloc(1, len);
if (!ptr) {
SDL_Log("Out of memory!");
Quit(1);
}
return ptr;
}
static void SetTitleBar(const char *fmt, ...)
{
@@ -232,7 +181,12 @@ static Thing *CreateThing(ThingType what, float x, float y, float z, float w, fl
Thing *i;
Thing *thing;
thing = (Thing *) xalloc(sizeof (Thing));
thing = (Thing *) SDL_calloc(1, sizeof (Thing));
if (!thing) {
SDL_Log("Out of memory!");
return NULL;
}
if ((w < 0) || (h < 0)) {
SDL_assert(texture != NULL);
if (w < 0) {
@@ -256,7 +210,7 @@ static Thing *CreateThing(ThingType what, float x, float y, float z, float w, fl
thing->scale = 1.0f;
thing->createticks = SDL_GetTicks();
thing->texture = texture;
thing->titlebar = titlebar ? xstrdup(titlebar) : NULL;
thing->titlebar = titlebar ? SDL_strdup(titlebar) : NULL; /* if allocation fails, oh well. */
/* insert in list by Z order (furthest from the "camera" first, so they get drawn over; negative Z is not drawn at all). */
if (things == NULL) {
@@ -515,12 +469,14 @@ static Thing *CreatePoofThing(Thing *poofing_thing)
const float centery = poofing_thing->rect.y + (poofing_thing->rect.h / 2);
const float z = poofing_thing->z;
Thing *thing = CreateThing(THING_POOF, poofing_thing->rect.x, poofing_thing->rect.y, z, poofing_thing->rect.w, poofing_thing->rect.h, poofing_thing->texture, NULL);
thing->data.poof.startw = poofing_thing->rect.w;
thing->data.poof.starth = poofing_thing->rect.h;
thing->data.poof.centerx = centerx;
thing->data.poof.centery = centery;
thing->ontick = PoofThing_ontick;
thing->ondrag = PoofThing_ondrag;
if (thing) {
thing->data.poof.startw = poofing_thing->rect.w;
thing->data.poof.starth = poofing_thing->rect.h;
thing->data.poof.centerx = centerx;
thing->data.poof.centery = centery;
thing->ontick = PoofThing_ontick;
thing->ondrag = PoofThing_ondrag;
}
return thing;
}
@@ -638,18 +594,20 @@ static Thing *CreateStreamThing(const SDL_AudioSpec *spec, const Uint8 *buf, con
{
static const ThingType can_be_dropped_onto[] = { THING_TRASHCAN, THING_LOGDEV, THING_LOGDEV_CAPTURE, THING_NULL };
Thing *thing = CreateThing(THING_STREAM, x, y, 0, -1, -1, soundboard_texture, fname);
SDL_Log("Adding audio stream for %s", fname ? fname : "(null)");
thing->data.stream.stream = SDL_CreateAudioStream(spec, spec);
if (buf && buflen) {
SDL_PutAudioStreamData(thing->data.stream.stream, buf, (int) buflen);
SDL_FlushAudioStream(thing->data.stream.stream);
thing->data.stream.total_bytes = SDL_GetAudioStreamAvailable(thing->data.stream.stream);
if (thing) {
SDL_Log("Adding audio stream for %s", fname ? fname : "(null)");
thing->data.stream.stream = SDL_CreateAudioStream(spec, spec);
if (buf && buflen) {
SDL_PutAudioStreamData(thing->data.stream.stream, buf, (int) buflen);
SDL_FlushAudioStream(thing->data.stream.stream);
thing->data.stream.total_bytes = SDL_GetAudioStreamAvailable(thing->data.stream.stream);
}
thing->ontick = StreamThing_ontick;
thing->ondrag = StreamThing_ondrag;
thing->ondrop = StreamThing_ondrop;
thing->ondraw = StreamThing_ondraw;
thing->can_be_dropped_onto = can_be_dropped_onto;
}
thing->ontick = StreamThing_ontick;
thing->ondrag = StreamThing_ondrag;
thing->ondrop = StreamThing_ondrop;
thing->ondraw = StreamThing_ondraw;
thing->can_be_dropped_onto = can_be_dropped_onto;
return thing;
}
@@ -703,13 +661,15 @@ static Thing *LoadWavThing(const char *fname, float x, float y)
SDL_asprintf(&titlebar, "WAV file (\"%s\", %s, %s, %uHz)", nodirs, AudioFmtToString(spec.format), AudioChansToStr(spec.channels), (unsigned int) spec.freq);
thing = CreateThing(THING_WAV, x - (audio_texture->w / 2), y - (audio_texture->h / 2), 5, -1, -1, audio_texture, titlebar);
SDL_free(titlebar);
SDL_memcpy(&thing->data.wav.spec, &spec, sizeof (SDL_AudioSpec));
thing->data.wav.buf = buf;
thing->data.wav.buflen = buflen;
thing->can_be_dropped_onto = can_be_dropped_onto;
thing->ondrag = WavThing_ondrag;
thing->ondrop = WavThing_ondrop;
if (thing) {
SDL_free(titlebar);
SDL_memcpy(&thing->data.wav.spec, &spec, sizeof (SDL_AudioSpec));
thing->data.wav.buf = buf;
thing->data.wav.buflen = buflen;
thing->can_be_dropped_onto = can_be_dropped_onto;
thing->ondrag = WavThing_ondrag;
thing->ondrop = WavThing_ondrop;
}
}
SDL_free(path);
@@ -743,17 +703,21 @@ static void DestroyTexture(Texture *tex)
static Texture *CreateTexture(const char *fname)
{
Texture *tex = (Texture *) xalloc(sizeof (Texture));
int texw, texh;
tex->texture = LoadTexture(state->renderers[0], fname, SDL_TRUE, &texw, &texh);
if (!tex->texture) {
SDL_Log("Failed to load '%s': %s", fname, SDL_GetError());
SDL_free(tex);
Quit(1);
Texture *tex = (Texture *) SDL_calloc(1, sizeof (Texture));
if (!tex) {
SDL_Log("Out of memory!");
} else {
int texw, texh;
tex->texture = LoadTexture(state->renderers[0], fname, SDL_TRUE, &texw, &texh);
if (!tex->texture) {
SDL_Log("Failed to load '%s': %s", fname, SDL_GetError());
SDL_free(tex);
return NULL;
}
SDL_SetTextureBlendMode(tex->texture, SDL_BLENDMODE_BLEND);
tex->w = (float) texw;
tex->h = (float) texh;
}
SDL_SetTextureBlendMode(tex->texture, SDL_BLENDMODE_BLEND);
tex->w = (float) texw;
tex->h = (float) texh;
return tex;
}
@@ -763,9 +727,11 @@ static void DeviceThing_ondrag(Thing *thing, int button, float x, float y)
{
if ((button == SDL_BUTTON_MIDDLE) && (thing->what == THING_LOGDEV_CAPTURE)) { /* drag out a new stream. This is a UX mess. :/ */
dragging_thing = CreateStreamThing(&thing->data.logdev.spec, NULL, 0, NULL, x, y);
dragging_thing->data.stream.next_level_update = SDL_GetTicks() + 100;
SDL_BindAudioStream(thing->data.logdev.devid, dragging_thing->data.stream.stream); /* bind to new device! */
dragging_thing->line_connected_to = thing;
if (dragging_thing) {
dragging_thing->data.stream.next_level_update = SDL_GetTicks() + 100;
SDL_BindAudioStream(thing->data.logdev.devid, dragging_thing->data.stream.stream); /* bind to new device! */
dragging_thing->line_connected_to = thing;
}
} else if (button == SDL_BUTTON_RIGHT) { /* drag out a new logical device. */
const SDL_AudioDeviceID which = ((thing->what == THING_LOGDEV) || (thing->what == THING_LOGDEV_CAPTURE)) ? thing->data.logdev.devid : thing->data.physdev.devid;
const SDL_AudioDeviceID devid = SDL_OpenAudioDevice(which, NULL);
@@ -929,22 +895,24 @@ static Thing *CreateLogicalDeviceThing(Thing *parent, const SDL_AudioDeviceID wh
SDL_Log("Adding logical audio device %u", (unsigned int) which);
thing = CreateThing(iscapture ? THING_LOGDEV_CAPTURE : THING_LOGDEV, x, y, 5, -1, -1, logdev_texture, NULL);
thing->data.logdev.devid = which;
thing->data.logdev.iscapture = iscapture;
thing->data.logdev.physdev = physthing;
thing->data.logdev.visualizer = SDL_CreateTexture(state->renderers[0], SDL_PIXELFORMAT_RGBA8888, SDL_TEXTUREACCESS_TARGET, VISUALIZER_WIDTH, VISUALIZER_HEIGHT);
thing->data.logdev.postmix_lock = SDL_CreateMutex();
if (thing->data.logdev.visualizer) {
SDL_SetTextureBlendMode(thing->data.logdev.visualizer, SDL_BLENDMODE_BLEND);
}
thing->line_connected_to = physthing;
thing->ontick = LogicalDeviceThing_ontick;
thing->ondrag = DeviceThing_ondrag;
thing->ondrop = LogicalDeviceThing_ondrop;
thing->ondraw = LogicalDeviceThing_ondraw;
thing->can_be_dropped_onto = can_be_dropped_onto;
if (thing) {
thing->data.logdev.devid = which;
thing->data.logdev.iscapture = iscapture;
thing->data.logdev.physdev = physthing;
thing->data.logdev.visualizer = SDL_CreateTexture(state->renderers[0], SDL_PIXELFORMAT_RGBA8888, SDL_TEXTUREACCESS_TARGET, VISUALIZER_WIDTH, VISUALIZER_HEIGHT);
thing->data.logdev.postmix_lock = SDL_CreateMutex();
if (thing->data.logdev.visualizer) {
SDL_SetTextureBlendMode(thing->data.logdev.visualizer, SDL_BLENDMODE_BLEND);
}
thing->line_connected_to = physthing;
thing->ontick = LogicalDeviceThing_ontick;
thing->ondrag = DeviceThing_ondrag;
thing->ondrop = LogicalDeviceThing_ondrop;
thing->ondraw = LogicalDeviceThing_ondraw;
thing->can_be_dropped_onto = can_be_dropped_onto;
SetLogicalDeviceTitlebar(thing);
SetLogicalDeviceTitlebar(thing);
}
return thing;
}
@@ -1002,21 +970,23 @@ static Thing *CreatePhysicalDeviceThing(const SDL_AudioDeviceID which, const SDL
SDL_Log("Adding physical audio device %u", (unsigned int) which);
thing = CreateThing(iscapture ? THING_PHYSDEV_CAPTURE : THING_PHYSDEV, next_physdev_x, 170, 5, -1, -1, physdev_texture, NULL);
thing->data.physdev.devid = which;
thing->data.physdev.iscapture = iscapture;
thing->data.physdev.name = SDL_GetAudioDeviceName(which);
thing->ondrag = DeviceThing_ondrag;
thing->ondrop = PhysicalDeviceThing_ondrop;
thing->ontick = PhysicalDeviceThing_ontick;
thing->can_be_dropped_onto = can_be_dropped_onto;
if (thing) {
thing->data.physdev.devid = which;
thing->data.physdev.iscapture = iscapture;
thing->data.physdev.name = SDL_GetAudioDeviceName(which);
thing->ondrag = DeviceThing_ondrag;
thing->ondrop = PhysicalDeviceThing_ondrop;
thing->ontick = PhysicalDeviceThing_ontick;
thing->can_be_dropped_onto = can_be_dropped_onto;
SetPhysicalDeviceTitlebar(thing);
if (SDL_GetTicks() <= (app_ready_ticks + 2000)) { /* assume this is the initial batch if it happens in the first two seconds. */
RepositionRowOfThings(THING_PHYSDEV, 10.0f); /* don't rearrange them after the initial add. */
RepositionRowOfThings(THING_PHYSDEV_CAPTURE, 170.0f); /* don't rearrange them after the initial add. */
next_physdev_x = 0.0f;
} else {
next_physdev_x += physdev_texture->w * 1.5f;
SetPhysicalDeviceTitlebar(thing);
if (SDL_GetTicks() <= (app_ready_ticks + 2000)) { /* assume this is the initial batch if it happens in the first two seconds. */
RepositionRowOfThings(THING_PHYSDEV, 10.0f); /* don't rearrange them after the initial add. */
RepositionRowOfThings(THING_PHYSDEV_CAPTURE, 170.0f); /* don't rearrange them after the initial add. */
next_physdev_x = 0.0f;
} else {
next_physdev_x += physdev_texture->w * 1.5f;
}
}
return thing;
@@ -1066,157 +1036,13 @@ static void WindowResized(const int newwinw, const int newwinh)
state->window_h = newwinh;
}
static void Loop(void)
{
SDL_Event event;
SDL_bool saw_event = SDL_FALSE;
if (app_ready_ticks == 0) {
app_ready_ticks = SDL_GetTicks();
}
while (SDL_PollEvent(&event)) {
Thing *thing = NULL;
saw_event = SDL_TRUE;
switch (event.type) {
case SDL_EVENT_MOUSE_MOTION:
thing = UpdateMouseOver(event.motion.x, event.motion.y);
if ((dragging_button == -1) && event.motion.state) {
if (event.motion.state & SDL_BUTTON_LMASK) {
/* for people that don't have all three buttons... */
if (ctrl_held) {
dragging_button = SDL_BUTTON_RIGHT;
} else if (alt_held) {
dragging_button = SDL_BUTTON_MIDDLE;
} else {
dragging_button = SDL_BUTTON_LEFT;
}
dragging_button_real = SDL_BUTTON_LEFT;
} else if (event.motion.state & SDL_BUTTON_RMASK) {
dragging_button = SDL_BUTTON_RIGHT;
dragging_button_real = SDL_BUTTON_RIGHT;
} else if (event.motion.state & SDL_BUTTON_MMASK) {
dragging_button = SDL_BUTTON_MIDDLE;
dragging_button_real = SDL_BUTTON_MIDDLE;
}
if (dragging_button != -1) {
dragging_thing = thing;
if (thing && thing->ondrag) {
thing->ondrag(thing, dragging_button, event.motion.x, event.motion.y);
}
}
}
droppable_highlighted_thing = NULL;
if (dragging_thing) {
dragging_thing->rect.x = event.motion.x - (dragging_thing->rect.w / 2);
dragging_thing->rect.y = event.motion.y - (dragging_thing->rect.h / 2);
if (dragging_thing->can_be_dropped_onto) {
thing = FindThingAtPoint(event.motion.x, event.motion.y);
if (thing) {
int i;
for (i = 0; dragging_thing->can_be_dropped_onto[i]; i++) {
if (dragging_thing->can_be_dropped_onto[i] == thing->what) {
droppable_highlighted_thing = thing;
break;
}
}
}
}
}
break;
case SDL_EVENT_MOUSE_BUTTON_DOWN:
thing = UpdateMouseOver(event.button.x, event.button.y);
break;
case SDL_EVENT_MOUSE_BUTTON_UP:
if (dragging_button_real == event.button.button) {
Thing *dropped_thing = dragging_thing;
dragging_thing = NULL;
dragging_button = -1;
dragging_button_real = -1;
if (dropped_thing && dropped_thing->ondrop) {
dropped_thing->ondrop(dropped_thing, event.button.button, event.button.x, event.button.y);
}
droppable_highlighted_thing = NULL;
}
thing = UpdateMouseOver(event.button.x, event.button.y);
break;
case SDL_EVENT_MOUSE_WHEEL:
UpdateMouseOver(event.wheel.mouseX, event.wheel.mouseY);
break;
case SDL_EVENT_KEY_DOWN:
case SDL_EVENT_KEY_UP:
ctrl_held = ((event.key.keysym.mod & SDL_KMOD_CTRL) != 0) ? SDL_TRUE : SDL_FALSE;
alt_held = ((event.key.keysym.mod & SDL_KMOD_ALT) != 0) ? SDL_TRUE : SDL_FALSE;
break;
case SDL_EVENT_DROP_FILE:
SDL_Log("Drop file! '%s'", event.drop.file);
LoadWavThing(event.drop.file, event.drop.x, event.drop.y);
/* SDLTest_CommonEvent will free the string, below. */
break;
case SDL_EVENT_WINDOW_RESIZED:
WindowResized(event.window.data1, event.window.data2);
break;
case SDL_EVENT_AUDIO_DEVICE_ADDED:
CreatePhysicalDeviceThing(event.adevice.which, event.adevice.iscapture);
break;
case SDL_EVENT_AUDIO_DEVICE_REMOVED: {
const SDL_AudioDeviceID which = event.adevice.which;
Thing *i, *next;
SDL_Log("Removing audio device %u", (unsigned int) which);
for (i = things; i != NULL; i = next) {
next = i->next;
if (((i->what == THING_PHYSDEV) || (i->what == THING_PHYSDEV_CAPTURE)) && (i->data.physdev.devid == which)) {
TrashThing(i);
next = things; /* in case we mangled the list. */
} else if (((i->what == THING_LOGDEV) || (i->what == THING_LOGDEV_CAPTURE)) && (i->data.logdev.devid == which)) {
TrashThing(i);
next = things; /* in case we mangled the list. */
}
}
break;
}
default: break;
}
SDLTest_CommonEvent(state, &event, &done);
}
TickThings();
Draw();
if (!saw_event) {
SDL_Delay(10);
}
#ifdef __EMSCRIPTEN__
if (done) {
emscripten_cancel_main_loop();
}
#endif
}
int main(int argc, char *argv[])
int SDL_AppInit(int argc, char *argv[])
{
int i;
state = SDLTest_CommonCreateState(argv, SDL_INIT_VIDEO | SDL_INIT_AUDIO);
if (state == NULL) {
Quit(1);
return -1;
}
state->window_flags |= SDL_WINDOW_RESIZABLE;
@@ -1234,13 +1060,13 @@ int main(int argc, char *argv[])
NULL
};
SDLTest_CommonLogUsage(state, argv[0], options);
Quit(1);
return -1;
}
i += consumed;
}
if (!SDLTest_CommonInit(state)) {
Quit(2);
return -1;
}
if (state->audio_id) {
@@ -1250,27 +1076,174 @@ int main(int argc, char *argv[])
SetDefaultTitleBar();
physdev_texture = CreateTexture("physaudiodev.bmp");
logdev_texture = CreateTexture("logaudiodev.bmp");
audio_texture = CreateTexture("audiofile.bmp");
trashcan_texture = CreateTexture("trashcan.bmp");
soundboard_texture = CreateTexture("soundboard.bmp");
soundboard_levels_texture = CreateTexture("soundboard_levels.bmp");
if ((physdev_texture = CreateTexture("physaudiodev.bmp")) == NULL) { return -1; }
if ((logdev_texture = CreateTexture("logaudiodev.bmp")) == NULL) { return -1; }
if ((audio_texture = CreateTexture("audiofile.bmp")) == NULL) { return -1; }
if ((trashcan_texture = CreateTexture("trashcan.bmp")) == NULL) { return -1; }
if ((soundboard_texture = CreateTexture("soundboard.bmp")) == NULL) { return -1; }
if ((soundboard_levels_texture = CreateTexture("soundboard_levels.bmp")) == NULL) { return -1; }
LoadStockWavThings();
CreateTrashcanThing();
CreateDefaultPhysicalDevice(SDL_FALSE);
CreateDefaultPhysicalDevice(SDL_TRUE);
#ifdef __EMSCRIPTEN__
emscripten_set_main_loop(Loop, 0, 1);
#else
while (!done) {
Loop();
}
#endif
Quit(0);
return 0;
}
static SDL_bool saw_event = SDL_FALSE;
int SDL_AppEvent(const SDL_Event *event)
{
Thing *thing = NULL;
saw_event = SDL_TRUE;
switch (event->type) {
case SDL_EVENT_MOUSE_MOTION:
thing = UpdateMouseOver(event->motion.x, event->motion.y);
if ((dragging_button == -1) && event->motion.state) {
if (event->motion.state & SDL_BUTTON_LMASK) {
/* for people that don't have all three buttons... */
if (ctrl_held) {
dragging_button = SDL_BUTTON_RIGHT;
} else if (alt_held) {
dragging_button = SDL_BUTTON_MIDDLE;
} else {
dragging_button = SDL_BUTTON_LEFT;
}
dragging_button_real = SDL_BUTTON_LEFT;
} else if (event->motion.state & SDL_BUTTON_RMASK) {
dragging_button = SDL_BUTTON_RIGHT;
dragging_button_real = SDL_BUTTON_RIGHT;
} else if (event->motion.state & SDL_BUTTON_MMASK) {
dragging_button = SDL_BUTTON_MIDDLE;
dragging_button_real = SDL_BUTTON_MIDDLE;
}
if (dragging_button != -1) {
dragging_thing = thing;
if (thing && thing->ondrag) {
thing->ondrag(thing, dragging_button, event->motion.x, event->motion.y);
}
}
}
droppable_highlighted_thing = NULL;
if (dragging_thing) {
dragging_thing->rect.x = event->motion.x - (dragging_thing->rect.w / 2);
dragging_thing->rect.y = event->motion.y - (dragging_thing->rect.h / 2);
if (dragging_thing->can_be_dropped_onto) {
thing = FindThingAtPoint(event->motion.x, event->motion.y);
if (thing) {
int i;
for (i = 0; dragging_thing->can_be_dropped_onto[i]; i++) {
if (dragging_thing->can_be_dropped_onto[i] == thing->what) {
droppable_highlighted_thing = thing;
break;
}
}
}
}
}
break;
case SDL_EVENT_MOUSE_BUTTON_DOWN:
thing = UpdateMouseOver(event->button.x, event->button.y);
break;
case SDL_EVENT_MOUSE_BUTTON_UP:
if (dragging_button_real == event->button.button) {
Thing *dropped_thing = dragging_thing;
dragging_thing = NULL;
dragging_button = -1;
dragging_button_real = -1;
if (dropped_thing && dropped_thing->ondrop) {
dropped_thing->ondrop(dropped_thing, event->button.button, event->button.x, event->button.y);
}
droppable_highlighted_thing = NULL;
}
thing = UpdateMouseOver(event->button.x, event->button.y);
break;
case SDL_EVENT_MOUSE_WHEEL:
UpdateMouseOver(event->wheel.mouseX, event->wheel.mouseY);
break;
case SDL_EVENT_KEY_DOWN:
case SDL_EVENT_KEY_UP:
ctrl_held = ((event->key.keysym.mod & SDL_KMOD_CTRL) != 0) ? SDL_TRUE : SDL_FALSE;
alt_held = ((event->key.keysym.mod & SDL_KMOD_ALT) != 0) ? SDL_TRUE : SDL_FALSE;
break;
case SDL_EVENT_DROP_FILE:
SDL_Log("Drop file! '%s'", event->drop.file);
LoadWavThing(event->drop.file, event->drop.x, event->drop.y);
/* SDL frees event->drop.file for you when you use SDL_AppEvent(). */
break;
case SDL_EVENT_WINDOW_RESIZED:
WindowResized(event->window.data1, event->window.data2);
break;
case SDL_EVENT_AUDIO_DEVICE_ADDED:
CreatePhysicalDeviceThing(event->adevice.which, event->adevice.iscapture);
break;
case SDL_EVENT_AUDIO_DEVICE_REMOVED: {
const SDL_AudioDeviceID which = event->adevice.which;
Thing *i, *next;
SDL_Log("Removing audio device %u", (unsigned int) which);
for (i = things; i != NULL; i = next) {
next = i->next;
if (((i->what == THING_PHYSDEV) || (i->what == THING_PHYSDEV_CAPTURE)) && (i->data.physdev.devid == which)) {
TrashThing(i);
next = things; /* in case we mangled the list. */
} else if (((i->what == THING_LOGDEV) || (i->what == THING_LOGDEV_CAPTURE)) && (i->data.logdev.devid == which)) {
TrashThing(i);
next = things; /* in case we mangled the list. */
}
}
break;
}
default: break;
}
return SDLTest_CommonEventMainCallbacks(state, event);
}
int SDL_AppIterate(void)
{
if (app_ready_ticks == 0) {
app_ready_ticks = SDL_GetTicks();
}
TickThings();
Draw();
if (saw_event) {
saw_event = SDL_FALSE; /* reset this so we know when SDL_AppEvent() runs again */
} else {
SDL_Delay(10);
}
return 0; /* keep going. */
}
void SDL_AppQuit(void)
{
while (things != NULL) {
DestroyThing(things); /* make sure all the audio devices are closed, etc. */
}
DestroyTexture(physdev_texture);
DestroyTexture(logdev_texture);
DestroyTexture(audio_texture);
DestroyTexture(trashcan_texture);
DestroyTexture(soundboard_texture);
DestroyTexture(soundboard_levels_texture);
SDLTest_CommonQuit(state);
}