Commit 01af7b02540ca7614188a34794287389f39fda48
2020-06-27T16:22:50
emscripten: support pseudo-synchronous screen refresh and events update using asyncify
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71
diff --git a/src/timer/unix/SDL_systimer.c b/src/timer/unix/SDL_systimer.c
index 411705a..7a44d05 100644
--- a/src/timer/unix/SDL_systimer.c
+++ b/src/timer/unix/SDL_systimer.c
@@ -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
diff --git a/src/video/emscripten/SDL_emscriptenframebuffer.c b/src/video/emscripten/SDL_emscriptenframebuffer.c
index 3c07d31..5c845fd 100644
--- a/src/video/emscripten/SDL_emscriptenframebuffer.c
+++ b/src/video/emscripten/SDL_emscriptenframebuffer.c
@@ -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;
}
diff --git a/src/video/emscripten/SDL_emscriptenopengles.c b/src/video/emscripten/SDL_emscriptenopengles.c
index f806bbe..3852fc7 100644
--- a/src/video/emscripten/SDL_emscriptenopengles.c
+++ b/src/video/emscripten/SDL_emscriptenopengles.c
@@ -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)
{