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sdl: prepare for emscripten port
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@igagis
igagis committed Dec 31, 2024
1 parent 245d969 commit 736f444
Showing 1 changed file with 132 additions and 125 deletions.
257 changes: 132 additions & 125 deletions src/ruisapp/glue/sdl/glue.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -599,148 +599,155 @@ void application::set_mouse_cursor_visible(bool visible)
// TODO:
}

int main(int argc, const char** argv)
{
std::unique_ptr<ruisapp::application> app = ruisapp::application_factory::create_application(argc, argv);
if (!app) {
return 1;
}

ASSERT(app)
namespace{
void main_loop_iteration(void* user_data){
ASSERT(user_data)
auto app = reinterpret_cast<ruisapp::application*>(user_data);

auto& ww = get_impl(*app);

while (!ww.quit_flag.load()) {
// sequence:
// - update updateables
// - render
// - wait for events and handle them/next cycle
// loop iteration sequence:
// - update updateables
// - render
// - wait for events and handle them/next cycle

auto to_wait_ms = app->gui.update();
// clamp to_wait_ms to max of int as SDL_WaitEventTimeout() accepts int type
to_wait_ms = std::min(to_wait_ms, uint32_t(std::numeric_limits<int32_t>::max()));
auto to_wait_ms = app->gui.update();
// clamp to_wait_ms to max of int as SDL_WaitEventTimeout() accepts int type
to_wait_ms = std::min(to_wait_ms, uint32_t(std::numeric_limits<int32_t>::max()));

render(*app);
render(*app);

if (SDL_WaitEventTimeout(nullptr, int(to_wait_ms)) == 0) {
// No events or error. In case of error not much we can do, just ignore it.
continue;
}
if (SDL_WaitEventTimeout(nullptr, int(to_wait_ms)) == 0) {
// No events or error. In case of error not much we can do, just ignore it.
return;
}

ruis::vector2 new_win_dims(-1, -1);

SDL_Event e;
while (SDL_PollEvent(&e) != 0) {
switch (e.type) {
case SDL_QUIT:
ww.quit_flag.store(true);
break;
case SDL_WINDOWEVENT:
switch (e.window.event) {
default:
break;
case SDL_WINDOWEVENT_RESIZED:
case SDL_WINDOWEVENT_SIZE_CHANGED:
// squash all window resize events into one, for that store the new
// window dimensions and update the viewport later only once
new_win_dims.x() = ruis::real(e.window.data1);
new_win_dims.y() = ruis::real(e.window.data2);
break;
case SDL_WINDOWEVENT_ENTER:
handle_mouse_hover(*app, true, 0);
break;
case SDL_WINDOWEVENT_LEAVE:
handle_mouse_hover(*app, false, 0);
break;
}
break;
case SDL_MOUSEMOTION:
{
int x = 0;
int y = 0;
SDL_GetMouseState(&x, &y);

handle_mouse_move(*app, ruis::vector2(x, y), 0);
}
break;
case SDL_MOUSEBUTTONDOWN:
[[fallthrough]];
case SDL_MOUSEBUTTONUP:
{
int x = 0;
int y = 0;
SDL_GetMouseState(&x, &y);

handle_mouse_button(
*app,
e.button.type == SDL_MOUSEBUTTONDOWN,
ruis::vector2(x, y),
button_number_to_enum(e.button.button),
0 // pointer id
ruis::vector2 new_win_dims(-1, -1);

SDL_Event e;
while (SDL_PollEvent(&e) != 0) {
switch (e.type) {
case SDL_QUIT:
ww.quit_flag.store(true);
break;
case SDL_WINDOWEVENT:
switch (e.window.event) {
default:
break;
case SDL_WINDOWEVENT_RESIZED:
case SDL_WINDOWEVENT_SIZE_CHANGED:
// squash all window resize events into one, for that store the new
// window dimensions and update the viewport later only once
new_win_dims.x() = ruis::real(e.window.data1);
new_win_dims.y() = ruis::real(e.window.data2);
break;
case SDL_WINDOWEVENT_ENTER:
handle_mouse_hover(*app, true, 0);
break;
case SDL_WINDOWEVENT_LEAVE:
handle_mouse_hover(*app, false, 0);
break;
}
break;
case SDL_MOUSEMOTION:
{
int x = 0;
int y = 0;
SDL_GetMouseState(&x, &y);

handle_mouse_move(*app, ruis::vector2(x, y), 0);
}
break;
case SDL_MOUSEBUTTONDOWN:
[[fallthrough]];
case SDL_MOUSEBUTTONUP:
{
int x = 0;
int y = 0;
SDL_GetMouseState(&x, &y);

handle_mouse_button(
*app,
e.button.type == SDL_MOUSEBUTTONDOWN,
ruis::vector2(x, y),
button_number_to_enum(e.button.button),
0 // pointer id
);
}
break;
case SDL_KEYDOWN:
[[fallthrough]];
case SDL_KEYUP:
{
auto key = sdl_scan_code_to_ruis_key(e.key.keysym.scancode);
if (e.key.repeat == 0) {
handle_key_event(
*app, //
e.key.type == SDL_KEYDOWN,
key
);
}
break;
case SDL_KEYDOWN:
[[fallthrough]];
case SDL_KEYUP:
{
auto key = sdl_scan_code_to_ruis_key(e.key.keysym.scancode);
if (e.key.repeat == 0) {
handle_key_event(
*app, //
e.key.type == SDL_KEYDOWN,
key
);
}
if (e.type == SDL_KEYDOWN) {
struct sdl_dummy_input_string_provider : public ruis::gui::input_string_provider {
std::u32string get() const override
{
return {};
}
};

handle_character_input(*app, sdl_dummy_input_string_provider(), key);
}
}
break;
case SDL_TEXTINPUT:
{
struct sdl_input_string_provider : public ruis::gui::input_string_provider {
const char* text;

sdl_input_string_provider(const char* text) :
text(text)
{}

if (e.type == SDL_KEYDOWN) {
struct sdl_dummy_input_string_provider : public ruis::gui::input_string_provider {
std::u32string get() const override
{
return utki::to_utf32(this->text);
return {};
}
} sdl_input_string_provider(
// save pointer to text, the ownership of text buffer is not taken!
&(e.text.text[0])
);
};

handle_character_input(*app, sdl_input_string_provider, ruis::key::unknown);
handle_character_input(*app, sdl_dummy_input_string_provider(), key);
}
break;
default:
if (e.type == ww.user_event_type) {
std::unique_ptr<std::function<void()>> f(
// NOLINTNEXTLINE(cppcoreguidelines-pro-type-reinterpret-cast)
reinterpret_cast<std::function<void()>*>(e.user.data1)
);
f->operator()();
}
break;
}
}
}
break;
case SDL_TEXTINPUT:
{
struct sdl_input_string_provider : public ruis::gui::input_string_provider {
const char* text;

if (new_win_dims.is_positive_or_zero()) {
update_window_rect(*app, ruis::rect(0, new_win_dims));
sdl_input_string_provider(const char* text) :
text(text)
{}

std::u32string get() const override
{
return utki::to_utf32(this->text);
}
} sdl_input_string_provider(
// save pointer to text, the ownership of text buffer is not taken!
&(e.text.text[0])
);

handle_character_input(*app, sdl_input_string_provider, ruis::key::unknown);
}
break;
default:
if (e.type == ww.user_event_type) {
std::unique_ptr<std::function<void()>> f(
// NOLINTNEXTLINE(cppcoreguidelines-pro-type-reinterpret-cast)
reinterpret_cast<std::function<void()>*>(e.user.data1)
);
f->operator()();
}
break;
}
}

if (new_win_dims.is_positive_or_zero()) {
update_window_rect(*app, ruis::rect(0, new_win_dims));
}
}
}

int main(int argc, const char** argv)
{
std::unique_ptr<ruisapp::application> app = ruisapp::application_factory::create_application(argc, argv);
if (!app) {
return 1;
}

while (!get_impl(*app).quit_flag.load()) {
main_loop_iteration(app.get());
}

return 0;
}

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