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testgl2: Press 'o' or 'p' to decrease/increase OpenGL swap interval.

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icculus committed Dec 16, 2018
1 parent 13869f1 commit c3e3503ee82bed86019dc8f435c48be44f35085f
Showing with 25 additions and 1 deletion.
  1. +25 −1 test/testgl2.c
@@ -218,6 +218,7 @@ main(int argc, char *argv[])
Uint32 then, now, frames;
int status;
int dw, dh;
int swap_interval = 0;

/* Enable standard application logging */
SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
@@ -289,11 +290,15 @@ main(int argc, char *argv[])

if (state->render_flags & SDL_RENDERER_PRESENTVSYNC) {
/* try late-swap-tearing first. If not supported, try normal vsync. */
if (SDL_GL_SetSwapInterval(-1) == -1) {
if (SDL_GL_SetSwapInterval(-1) == 0) {
swap_interval = -1;
} else {
SDL_GL_SetSwapInterval(1);
swap_interval = 1;
}
} else {
SDL_GL_SetSwapInterval(0); /* disable vsync. */
swap_interval = 0;
}

SDL_GetCurrentDisplayMode(0, &mode);
@@ -377,16 +382,35 @@ main(int argc, char *argv[])
then = SDL_GetTicks();
done = 0;
while (!done) {
SDL_bool update_swap_interval = SDL_FALSE;

/* Check for events */
++frames;
while (SDL_PollEvent(&event)) {
SDLTest_CommonEvent(state, &event, &done);
if (event.type == SDL_KEYDOWN) {
if (event.key.keysym.sym == SDLK_o) {
swap_interval--;
update_swap_interval = SDL_TRUE;
} else if (event.key.keysym.sym == SDLK_p) {
swap_interval++;
update_swap_interval = SDL_TRUE;
}
}
}

if (update_swap_interval) {
SDL_Log("Swap interval to be set to %d\n", swap_interval);
}

for (i = 0; i < state->num_windows; ++i) {
int w, h;
if (state->windows[i] == NULL)
continue;
SDL_GL_MakeCurrent(state->windows[i], context);
if (update_swap_interval) {
SDL_GL_SetSwapInterval(swap_interval);
}
SDL_GL_GetDrawableSize(state->windows[i], &w, &h);
ctx.glViewport(0, 0, w, h);
Render();

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