forked from Green-Sky/tomato
start screen refactor
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parent
9c0ffd38ce
commit
5a0252d8d0
63
src/main.cpp
63
src/main.cpp
@ -21,7 +21,8 @@ int main(int argc, char** argv) {
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std::cerr << "Failed to set '" << SDL_HINT_VIDEO_ALLOW_SCREENSAVER << "' to 1\n";
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}
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auto last_time = std::chrono::steady_clock::now();
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auto last_time_render = std::chrono::steady_clock::now();
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auto last_time_tick = std::chrono::steady_clock::now();
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// actual setup
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if (SDL_Init(SDL_INIT_VIDEO) < 0) {
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@ -68,9 +69,23 @@ int main(int argc, char** argv) {
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bool quit = false;
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while (!quit) {
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auto new_time = std::chrono::steady_clock::now();
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//const float time_delta {std::chrono::duration<float, std::chrono::seconds::period>(new_time - last_time).count()};
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last_time = new_time;
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const float time_delta_tick = std::chrono::duration<float, std::chrono::seconds::period>(new_time - last_time_tick).count();
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const float time_delta_render = std::chrono::duration<float, std::chrono::seconds::period>(new_time - last_time_render).count();
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bool tick = time_delta_tick >= screen->nextTick();
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bool render = time_delta_render >= screen->nextRender();
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if (tick) {
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Screen* ret_screen = screen->tick(time_delta_tick, quit);
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if (ret_screen != nullptr) {
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screen.reset(ret_screen);
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}
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last_time_tick = new_time;
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}
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// can do both in the same loop
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if (render) {
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SDL_Event event;
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while (SDL_PollEvent(&event)) {
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if (event.type == SDL_EVENT_QUIT) {
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@ -97,12 +112,12 @@ int main(int argc, char** argv) {
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ImGui_ImplSDL3_NewFrame();
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ImGui::NewFrame();
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//ImGui::ShowDemoWindow();
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Screen* ret_screen = screen->poll(quit);
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{ // render
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Screen* ret_screen = screen->render(time_delta_render, quit);
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if (ret_screen != nullptr) {
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screen.reset(ret_screen);
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}
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}
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ImGui::Render();
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ImGui_ImplSDLRenderer3_RenderDrawData(ImGui::GetDrawData());
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@ -112,10 +127,38 @@ int main(int argc, char** argv) {
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SDL_SetRenderDrawColor(renderer.get(), 0x10, 0x10, 0x10, SDL_ALPHA_OPAQUE);
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SDL_RenderClear(renderer.get());
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std::this_thread::sleep_for( // time left to get to 60fps
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std::chrono::duration<float, std::chrono::seconds::period>(0.0166f) // 60fps frame duration
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- std::chrono::duration<float, std::chrono::seconds::period>(std::chrono::steady_clock::now() - new_time) // time used for rendering
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);
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last_time_render = new_time;
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}
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//// TODO: seperate out render and tick
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//const float time_to_next_loop = std::min<float>(screen->nextRender(), screen->nextTick());
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//std::this_thread::sleep_for( // time left to get to 60fps
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//std::chrono::duration<float, std::chrono::seconds::period>(time_to_next_loop)
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//- std::chrono::duration<float, std::chrono::seconds::period>(std::chrono::steady_clock::now() - new_time) // time used for rendering
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//);
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if (render || tick) {
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std::this_thread::sleep_for(std::chrono::milliseconds(1)); // yield for 1ms
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} else {
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#if 0
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// pretty hacky and spins if close to next update
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// if next loop >= 1ms away, wait 1ms
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if (time_delta_tick+0.001f < screen->nextTick() && time_delta_render+0.001f < screen->nextRender()) {
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std::this_thread::sleep_for(std::chrono::milliseconds(1)); // yield for 1ms
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}
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#else
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// dynamic sleep, sleeps the reminder till next update
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std::this_thread::sleep_for(std::chrono::duration<float, std::chrono::seconds::period>(
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std::min<float>(
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screen->nextTick() - time_delta_tick,
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screen->nextRender() - time_delta_render
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)
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));
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#endif
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}
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}
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return 0;
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@ -81,11 +81,7 @@ bool MainScreen::handleEvent(SDL_Event& e) {
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return false;
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}
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Screen* MainScreen::poll(bool& quit) {
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auto new_time = std::chrono::high_resolution_clock::now();
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const float time_delta {std::chrono::duration<float, std::chrono::seconds::period>(new_time - last_time).count()};
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last_time = new_time;
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Screen* MainScreen::render(float time_delta, bool& quit) {
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quit = !tc.iterate();
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tcm.iterate(time_delta);
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@ -123,34 +119,14 @@ Screen* MainScreen::poll(bool& quit) {
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ImGui::ShowDemoWindow();
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}
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#if 0
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{ // texture tests
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const size_t width = 8;
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const size_t height = 8;
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#define W 0xff, 0xff, 0xff, 0xff
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#define B 0x00, 0x00, 0x00, 0xff
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#define P 0xff, 0x00, 0xff, 0xff
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static uint8_t raw_pixel[width*height*4] {
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P, W, W, W, W, W, W, P,
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W, W, W, W, W, W, W, W,
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W, W, W, W, W, W, W, W,
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W, W, W, B, B, W, W, W,
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W, W, W, B, B, W, W, W,
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W, W, W, W, W, W, W, W,
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W, W, W, W, W, W, W, W,
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P, W, W, W, W, W, W, P,
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};
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return nullptr;
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}
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static uint64_t texture = sdlrtu.uploadRGBA(raw_pixel, width, height);
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if (ImGui::Begin("test texture")) {
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ImGui::Text("test texture windoajsdf");
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ImGui::Image(reinterpret_cast<void*>(texture), {width*10, height*10});
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}
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ImGui::End();
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}
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#endif
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Screen* MainScreen::tick(float time_delta, bool& quit) {
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_min_tick_interval = std::min<float>(
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tc.toxIterationInterval()/1000.f,
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0.03f // HACK: 30ms upper bound, should be the same as tox but will change
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);
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return nullptr;
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}
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@ -73,6 +73,13 @@ struct MainScreen final : public Screen {
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// return nullptr if not next
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// sets bool quit to true if exit
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Screen* poll(bool&) override;
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Screen* render(float time_delta, bool&) override;
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Screen* tick(float time_delta, bool&) override;
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float _render_interval {1.f/60.f};
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float _min_tick_interval {0.f};
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float nextRender(void) override { return _render_interval; }
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float nextTick(void) override { return _min_tick_interval; }
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};
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@ -2,14 +2,21 @@
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#include <SDL3/SDL.h>
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// all time values are in seconds
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struct Screen {
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virtual ~Screen(void) = default;
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// return true if handled
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virtual bool handleEvent(SDL_Event& e) { return false; }
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virtual bool handleEvent(SDL_Event&) { return false; }
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// return nullptr if not next
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// sets bool quit to true if exit
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virtual Screen* poll(bool& quit) = 0;
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// both render and tick get called in the selfreported intervals
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virtual Screen* render(float time_delta, bool& quit) = 0; // pure since this is a graphical app
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virtual Screen* tick(float time_delta, bool& quit) = 0;
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// TODO: const?
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virtual float nextRender(void) { return 1.f/60.f; }
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virtual float nextTick(void) { return 0.03f; }
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};
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@ -11,7 +11,7 @@
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StartScreen::StartScreen(SDL_Renderer* renderer) : _renderer(renderer) {
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}
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Screen* StartScreen::poll(bool&) {
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Screen* StartScreen::render(float, bool&) {
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// TODO: imgui tox profile selector?
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@ -137,3 +137,7 @@ Screen* StartScreen::poll(bool&) {
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return nullptr;
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}
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Screen* StartScreen::tick(float, bool&) {
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return nullptr;
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}
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@ -30,6 +30,9 @@ struct StartScreen final : public Screen {
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// return nullptr if not next
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// sets bool quit to true if exit
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Screen* poll(bool&) override;
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Screen* render(float, bool&) override;
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Screen* tick(float, bool&) override;
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// use default nextRender and nextTick
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};
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