180f9e3856
* Major refactoring of the main loop(s) and control flow (WIP) run_at_fps() is gone 🦀 Instead of nested blocking event loops, there is now an eventloop API that manages an explicit stack of scenes. This makes Taisei a lot more portable to async environments where spinning a loop forever without yielding control simply is not an option, and that is the entire point of this change. A prime example of such an environment is the Web (via emscripten). Taisei was able to run there through a terrible hack: inserting emscripten_sleep calls into the loop, which would yield to the browser. This has several major drawbacks: first of all, every function that could possibly call emscripten_sleep must be compiled into a special kind of bytecode, which then has to be interpreted at runtime, *much* slower than JITed WebAssembly. And that includes *everything* down the call stack, too! For more information, see https://emscripten.org/docs/porting/emterpreter.html Even though that method worked well enough for experimenting, despite suboptimal performance, there is another obvious drawback: emscripten_sleep is implemented via setTimeout(), which can be very imprecise and is generally not reliable for fluid animation. Browsers actually have an API specifically for that use case: window.requestAnimationFrame(), but Taisei's original blocking control flow style is simply not compatible with it. Emscripten exposes this API with its emscripten_set_main_loop(), which the eventloop backend now uses on that platform. Unfortunately, C is still C, with no fancy closures or coroutines. With blocking calls into menu/scene loops gone, the control flow is reimplemented via so-called (pun intended) "call chains". That is basically an euphemism for callback hell. With manual memory management and zero type-safety. Not that the menu system wasn't shitty enough already. I'll just keep telling myself that this is all temporary and will be replaced with scripts in v1.4. * improve build system for emscripten + various fixes * squish menu bugs * improve emscripten event loop; disable EMULATE_FUNCTION_POINTER_CASTS Note that stock freetype does not work without EMULATE_FUNCTION_POINTER_CASTS; use a patched version from the "emscripten" branch here: https://github.com/taisei-project/freetype2/tree/emscripten * Enable -Wcast-function-type Calling functions through incompatible pointers is nasal demons and doesn't work in WASM. * webgl: workaround a crash on some browsers * emscripten improvements: * Persist state (config, progress, replays, ...) in local IndexDB * Simpler HTML shell (temporary) * Enable more optimizations * fix build if validate_glsl=false * emscripten: improve asset packaging, with local cache Note that even though there are rules to build audio bundles, audio does *not* work yet. It looks like SDL2_mixer can not work without threads, which is a problem. Yet another reason to write an OpenAL backend - emscripten supports that natively. * emscripten: customize the html shell * emscripten: force "show log" checkbox unchecked initially * emscripten: remove quit shortcut from main menu (since there's no quit) * emscripten: log area fixes * emscripten/webgl: workaround for fullscreen viewport issue * emscripten: implement frameskip * emscripter: improve framerate limiter * align List to at least 8 bytes (shut up warnings) * fix non-emscripten builds * improve fullscreen handling, mainly for emscripten * Workaround to make audio work in chromium emscripten-core/emscripten#6511 * emscripten: better vsync handling; enable vsync & disable fxaa by default
56 lines
1.4 KiB
C
56 lines
1.4 KiB
C
/*
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* This software is licensed under the terms of the MIT-License
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* See COPYING for further information.
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* ---
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* Copyright (c) 2011-2019, Lukas Weber <laochailan@web.de>.
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* Copyright (c) 2012-2019, Andrei Alexeyev <akari@alienslab.net>.
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*/
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#include "taisei.h"
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#include "framerate.h"
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#include "global.h"
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#include "video.h"
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void fpscounter_reset(FPSCounter *fps) {
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hrtime_t frametime = HRTIME_RESOLUTION / FPS;
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const int log_size = sizeof(fps->frametimes)/sizeof(hrtime_t);
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for(int i = 0; i < log_size; ++i) {
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fps->frametimes[i] = frametime;
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}
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fps->fps = HRTIME_RESOLUTION / (long double)frametime;
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fps->frametime = frametime;
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fps->last_update_time = time_get();
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}
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void fpscounter_update(FPSCounter *fps) {
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const int log_size = sizeof(fps->frametimes)/sizeof(hrtime_t);
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hrtime_t frametime = time_get() - fps->last_update_time;
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memmove(fps->frametimes, fps->frametimes + 1, (log_size - 1) * sizeof(hrtime_t));
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fps->frametimes[log_size - 1] = frametime;
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hrtime_t avg = 0;
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for(int i = 0; i < log_size; ++i) {
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avg += fps->frametimes[i];
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}
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fps->fps = HRTIME_RESOLUTION / (avg / (long double)log_size);
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fps->frametime = avg / log_size;
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fps->last_update_time = time_get();
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}
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uint32_t get_effective_frameskip(void) {
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uint32_t frameskip;
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if(global.frameskip > 0) {
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frameskip = global.frameskip;
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} else {
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frameskip = config_get_int(CONFIG_VID_FRAMESKIP);
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}
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return frameskip;
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}
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