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https://github.com/TerryCavanagh/VVVVVV.git
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Seed with frame counter instead of SDL_GetTicks
Using SDL_GetTicks() to seed the Gravitron RNG caused many reproducibility issues while syncing https://tasvideos.org/7575S . To fix this, add a frame counter, which is a number that is incremented every frame and never resets, and use it instead. If someone needs to switch back to SDL_GetTicks() for old TASes, then provide the -seed-use-sdl-getticks command-line option for them.
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4 changed files with 21 additions and 2 deletions
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@ -274,6 +274,8 @@ void Game::init(void)
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deathcounts = 0;
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gameoverdelay = 0;
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framecounter = 0;
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seed_use_sdl_getticks = false;
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resetgameclock();
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gamesaved = false;
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gamesavefailed = false;
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@ -257,6 +257,8 @@ public:
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int lastsaved;
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int deathcounts;
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int framecounter;
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bool seed_use_sdl_getticks;
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int frames, seconds, minutes, hours;
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bool gamesaved;
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bool gamesavefailed;
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@ -3094,8 +3094,15 @@ void scriptclass::hardreset(void)
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{
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const bool version2_2 = GlitchrunnerMode_less_than_or_equal(Glitchrunner2_2);
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if (game.seed_use_sdl_getticks)
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{
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/* The RNG is 32-bit. We don't _really_ need 64-bit... */
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xoshiro_seed((Uint32) SDL_GetTicks64());
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}
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else
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{
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xoshiro_seed(game.framecounter);
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}
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//Game:
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game.hascontrol = true;
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@ -368,6 +368,7 @@ int main(int argc, char *argv[])
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{
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char* baseDir = NULL;
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char* assetsPath = NULL;
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bool seed_use_sdl_getticks = false;
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vlog_init();
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@ -478,6 +479,10 @@ int main(int argc, char *argv[])
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{
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vlog_toggle_error(0);
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}
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else if (ARG("-seed-use-sdl-getticks"))
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{
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seed_use_sdl_getticks = true;
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}
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#undef ARG_INNER
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#undef ARG
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else
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@ -546,6 +551,7 @@ int main(int argc, char *argv[])
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graphics.init();
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game.init();
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game.seed_use_sdl_getticks = seed_use_sdl_getticks;
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// This loads music too...
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if (!graphics.reloadresources())
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@ -838,6 +844,8 @@ static void focused_end(void)
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static enum LoopCode loop_end(void)
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{
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++game.framecounter;
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//We did editorinput, now it's safe to turn this off
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key.linealreadyemptykludge = false;
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