diff options
Diffstat (limited to 'src/crepe/api/LoopTimer.cpp')
-rw-r--r-- | src/crepe/api/LoopTimer.cpp | 95 |
1 files changed, 46 insertions, 49 deletions
diff --git a/src/crepe/api/LoopTimer.cpp b/src/crepe/api/LoopTimer.cpp index 039e35e..8f09e41 100644 --- a/src/crepe/api/LoopTimer.cpp +++ b/src/crepe/api/LoopTimer.cpp @@ -7,83 +7,80 @@ using namespace crepe; -LoopTimer::LoopTimer() { - dbg_trace(); -} +LoopTimer::LoopTimer() { dbg_trace(); } LoopTimer & LoopTimer::get_instance() { - static LoopTimer instance; - return instance; + static LoopTimer instance; + return instance; } void LoopTimer::start() { - this->last_frame_time = std::chrono::steady_clock::now(); - this->elapsed_time = std::chrono::milliseconds(0); - this->elapsed_fixed_time = std::chrono::milliseconds(0); - this->delta_time = std::chrono::milliseconds(0); + this->last_frame_time = std::chrono::steady_clock::now(); + this->elapsed_time = std::chrono::milliseconds(0); + this->elapsed_fixed_time = std::chrono::milliseconds(0); + this->delta_time = std::chrono::milliseconds(0); } void LoopTimer::update() { - auto current_frame_time = std::chrono::steady_clock::now(); - // Convert to duration in seconds for delta time - this->delta_time = std::chrono::duration_cast<std::chrono::duration<double>>(current_frame_time - last_frame_time); - - if (this->delta_time > this->maximum_delta_time) { - this->delta_time = this->maximum_delta_time; - } - - this->delta_time *= this->game_scale; - this->elapsed_time += this->delta_time; - this->last_frame_time = current_frame_time; + auto current_frame_time = std::chrono::steady_clock::now(); + // Convert to duration in seconds for delta time + this->delta_time + = std::chrono::duration_cast<std::chrono::duration<double>>( + current_frame_time - last_frame_time); + + if (this->delta_time > this->maximum_delta_time) { + this->delta_time = this->maximum_delta_time; + } + + this->delta_time *= this->game_scale; + this->elapsed_time += this->delta_time; + this->last_frame_time = current_frame_time; } -double LoopTimer::get_delta_time() const { - return this->delta_time.count(); -} +double LoopTimer::get_delta_time() const { return this->delta_time.count(); } double LoopTimer::get_current_time() const { - return this->elapsed_time.count(); + return this->elapsed_time.count(); } void LoopTimer::advance_fixed_update() { - this->elapsed_fixed_time += this->fixed_delta_time; + this->elapsed_fixed_time += this->fixed_delta_time; } double LoopTimer::get_fixed_delta_time() const { - return this->fixed_delta_time.count(); + return this->fixed_delta_time.count(); } void LoopTimer::set_fps(int fps) { - this->fps = fps; + this->fps = fps; // target time per frame in seconds - this->frame_target_time = std::chrono::seconds(1) / fps; + this->frame_target_time = std::chrono::seconds(1) / fps; } -int LoopTimer::get_fps() const { - return this->fps; -} +int LoopTimer::get_fps() const { return this->fps; } -void LoopTimer::set_game_scale(double value) { - this->game_scale = value; -} +void LoopTimer::set_game_scale(double value) { this->game_scale = value; } -double LoopTimer::get_game_scale() const { - return this->game_scale; -} +double LoopTimer::get_game_scale() const { return this->game_scale; } void LoopTimer::enforce_frame_rate() { - std::chrono::steady_clock::time_point current_frame_time = std::chrono::steady_clock::now(); - std::chrono::milliseconds frame_duration = std::chrono::duration_cast<std::chrono::milliseconds>(current_frame_time - this->last_frame_time); - - if (frame_duration < this->frame_target_time) { - std::chrono::milliseconds delay_time = std::chrono::duration_cast<std::chrono::milliseconds>(this->frame_target_time - frame_duration); - if (delay_time.count() > 0) { - SDLContext::get_instance().delay(delay_time.count()); - } - } - - this->last_frame_time = current_frame_time; + std::chrono::steady_clock::time_point current_frame_time + = std::chrono::steady_clock::now(); + std::chrono::milliseconds frame_duration + = std::chrono::duration_cast<std::chrono::milliseconds>( + current_frame_time - this->last_frame_time); + + if (frame_duration < this->frame_target_time) { + std::chrono::milliseconds delay_time + = std::chrono::duration_cast<std::chrono::milliseconds>( + this->frame_target_time - frame_duration); + if (delay_time.count() > 0) { + SDLContext::get_instance().delay(delay_time.count()); + } + } + + this->last_frame_time = current_frame_time; } double LoopTimer::get_lag() const { - return (this->elapsed_time - this->elapsed_fixed_time).count(); + return (this->elapsed_time - this->elapsed_fixed_time).count(); } |