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emscripten: support pseudo-synchronous screen refresh and events update using asyncify

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This commit is contained in:
Sylvain Beucler 2020-06-27 16:22:50 -04:00
parent 3b71ebecd6
commit 01af7b0254
3 changed files with 28 additions and 1 deletions
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11
src/timer/unix/SDL_systimer.c
View file

@ -31,6 +31,10 @@
#include "SDL_assert.h"
#include "../SDL_timer_c.h"
#ifdef __EMSCRIPTEN__
#include <emscripten.h>
#endif
/* The clock_gettime provides monotonous time, so we should use it if
it's available. The clock_gettime function is behind ifdef
for __USE_POSIX199309
@ -186,6 +190,13 @@ SDL_GetPerformanceFrequency(void)
void
SDL_Delay(Uint32 ms)
{
#ifdef __EMSCRIPTEN__
if (emscripten_has_asyncify()) {
/* pseudo-synchronous pause */
emscripten_sleep(ms);
return;
}
#endif
int was_error;
#if HAVE_NANOSLEEP

6
src/video/emscripten/SDL_emscriptenframebuffer.c
View file

@ -162,6 +162,12 @@ int Emscripten_UpdateWindowFramebuffer(_THIS, SDL_Window * window, const SDL_Rec
SDL_GetWindowID(window), ++frame_number);
SDL_SaveBMP(surface, file);
}*/
if (emscripten_has_asyncify()) {
/* give back control to browser for screen refresh */
emscripten_sleep(0);
}
return 0;
}

12
src/video/emscripten/SDL_emscriptenopengles.c
View file

@ -82,9 +82,19 @@ Emscripten_GLES_LoadLibrary(_THIS, const char *path) {
}
SDL_EGL_CreateContext_impl(Emscripten)
SDL_EGL_SwapWindow_impl(Emscripten)
SDL_EGL_MakeCurrent_impl(Emscripten)
int
Emscripten_GLES_SwapWindow(_THIS, SDL_Window * window)
{
EGLBoolean ret = SDL_EGL_SwapBuffers(_this, ((SDL_WindowData *) window->driverdata)->egl_surface);
if (emscripten_has_asyncify()) {
/* give back control to browser for screen refresh */
emscripten_sleep(0);
}
return ret;
}
void
Emscripten_GLES_GetDrawableSize(_THIS, SDL_Window * window, int * w, int * h)
{