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emscripten: Introduce SDL_HINT_EMSCRIPTEN_ASYNCIFY

Browse Source 
See https://github.com/emscripten-core/emscripten/issues/10746

and

https://github.com/emscripten-ports/SDL2/pull/112

Fixes Bugzilla #4997.
This commit is contained in:
Sylvain Beucler 2020-06-27 16:25:47 -04:00
parent 01af7b0254
commit e594a6738a
4 changed files with 22 additions and 4 deletions
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15
include/SDL_hints.h
View File

@ -1042,6 +1042,21 @@ extern "C" {
*/
#define SDL_HINT_EMSCRIPTEN_KEYBOARD_ELEMENT "SDL_EMSCRIPTEN_KEYBOARD_ELEMENT"
/**
* \brief Disable giving back control to the browser automatically
* when running with asyncify
*
* With -s ASYNCIFY, SDL2 calls emscripten_sleep during operations
* such as refreshing the screen or polling events.
*
* This hint only applies to the emscripten platform
*
* The variable can be set to the following values:
* "0" - Disable emscripten_sleep calls (if you give back browser control manually or use asyncify for other purposes)
* "1" - Enable emscripten_sleep calls (the default)
*/
#define SDL_HINT_EMSCRIPTEN_ASYNCIFY "SDL_EMSCRIPTEN_ASYNCIFY"
/**
* \brief Tell SDL not to catch the SIGINT or SIGTERM signals.
*

5
src/timer/unix/SDL_systimer.c
View File

@ -29,6 +29,7 @@
#include "SDL_timer.h"
#include "SDL_assert.h"
#include "SDL_hints.h"
#include "../SDL_timer_c.h"
#ifdef __EMSCRIPTEN__
@ -191,8 +192,8 @@ void
SDL_Delay(Uint32 ms)
{
#ifdef __EMSCRIPTEN__
if (emscripten_has_asyncify()) {
/* pseudo-synchronous pause */
if (emscripten_has_asyncify() && SDL_GetHintBoolean(SDL_HINT_EMSCRIPTEN_ASYNCIFY, SDL_TRUE)) {
/* pseudo-synchronous pause, used directly or through e.g. SDL_WaitEvent */
emscripten_sleep(ms);
return;
}

3
src/video/emscripten/SDL_emscriptenframebuffer.c
View File

@ -24,6 +24,7 @@
#include "SDL_emscriptenvideo.h"
#include "SDL_emscriptenframebuffer.h"
#include "SDL_hints.h"
int Emscripten_CreateWindowFramebuffer(_THIS, SDL_Window * window, Uint32 * format, void ** pixels, int *pitch)
@ -163,7 +164,7 @@ int Emscripten_UpdateWindowFramebuffer(_THIS, SDL_Window * window, const SDL_Rec
SDL_SaveBMP(surface, file);
}*/
if (emscripten_has_asyncify()) {
if (emscripten_has_asyncify() && SDL_GetHintBoolean(SDL_HINT_EMSCRIPTEN_ASYNCIFY, SDL_TRUE)) {
/* give back control to browser for screen refresh */
emscripten_sleep(0);
}

3
src/video/emscripten/SDL_emscriptenopengles.c
View File

@ -27,6 +27,7 @@
#include "SDL_emscriptenvideo.h"
#include "SDL_emscriptenopengles.h"
#include "SDL_hints.h"
#define LOAD_FUNC(NAME) _this->egl_data->NAME = NAME;
@ -88,7 +89,7 @@ int
Emscripten_GLES_SwapWindow(_THIS, SDL_Window * window)
{
EGLBoolean ret = SDL_EGL_SwapBuffers(_this, ((SDL_WindowData *) window->driverdata)->egl_surface);
if (emscripten_has_asyncify()) {
if (emscripten_has_asyncify() && SDL_GetHintBoolean(SDL_HINT_EMSCRIPTEN_ASYNCIFY, SDL_TRUE)) {
/* give back control to browser for screen refresh */
emscripten_sleep(0);
}