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diff --git a/research.tex b/research.tex index 5340bf5..f3424c4 100644 --- a/research.tex +++ b/research.tex @@ -240,46 +240,83 @@ for audio some options could be: FMOD, Wwise, or iirKlang \subsection{Conclusion} -% TODO: this entire section \section{Audio} -% should audio research be scoped down to SDL2 (if that's what we're going with) or -% standalone libraries only (for modularity?). +The game engine is required to have an audio system +\autocite[\ref{req:audio}]{crepe:requirements}. Since writing a custom real-time +audio mixing engine is outside the scope of this project\mref, this section compares +various standalone audio libraries for suitability in the engine. + +\Cref{sec:audio:libs} details which libraries were considered, +\cref{sec:audio:benchmark} compares their performance, and +\cref{sec:audio:conclusion} concludes with a recommendation for most performant audio +library. -The game engine is required to have an audio system with support for playing multiple -audio streams (i.e.~tracks or samples) simultaniously. Since writing a custom live -audio mixing engine is outside the scope of this project, this section compares -various standalone audio engines that could be used in the engine. +\subsection{Libraries} +\label{sec:audio:libs} -% TODO: requirements first! +\Cref{tab:audio:libs} lists the standalone audio engine libraries that fit +\cref{req:audio,req:lib:license}. -% REQ ~ is cross-platform -% REQ ~ supports multiple audio formats (TODO: which) -% REQ ~ supports simultanious playback / mixing -% REQ ~ has an open-source license \begin{table} \centering \begin{tabular}{llc} \toprule \textbf{Library} & \textbf{License} & \textbf{API}\\ \midrule - miniaudio & MIT-0 & C\\ - YSE & EPL & C++\\ - SoLoud & Zlip/LibPng & C++\\ + miniaudio \autocite{lib:miniaudio} & MIT-0 & C\\ + YSE \autocite{lib:yse} & EPL & C++\\ + SoLoud \autocite{lib:soloud} & Zlip/LibPng & C++\\ \bottomrule \end{tabular} \caption{Audio engine library comparison} - \label{tab:audio-engines} + \label{tab:audio:libs} \end{table} -% TODO: ref https://miniaud.io/ -% TODO: ref https://www.attr-x.net/yse/ -Not considered further: +Other popular libraries that were researched but are unsuitable for this project +include:\noparbreak \begin{description} - \item[FMOD] is proprietary - \item[PortAudio] requires manual mixing + \item[FMOD \autocite{lib:fmod}] Is proprietary (violates \cref{req:lib:license}) + \item[PortAudio \autocite{lib:portaudio}] Does not handle mixing \end{description} +\subsection{Benchmarks} +\label{sec:audio:benchmark} + +The same benchmark application was written for each of the libraries listed in +\cref{tab:audio:libs}. The application does the following:\noparbreak +\begin{enumerate} + \item Load a background track (Ogg Vorbis) + \item Load three short samples (WAV) + \item Start the background track + \item Play each sample sequentially while pausing and resuming the background track + \item Play all samples simultaniously + \item Stop all audio and exit +\end{enumerate} + +Each benchmark was profiled using \emph{perf} \autocite{tool:perf} and compared based +on total CPU and memory utilization. The results of these benchmarks are listed in +\cref{tab:audio:benchmark}. + +\begin{table} + \centering + \begin{tabular}{lr} + \toprule + \textbf{Library} & \textbf{???}\\ + \midrule + miniaudio &\\ + YSE &\\ + SoLoud &\\ + \bottomrule + \end{tabular} + \caption{Audio engine library benchmark results} + \label{tab:audio:benchmark} +\end{table} + +\subsection{Conclusion} +\label{sec:audio:conclusion} + + \section{Physics} \subsection{Introduction} |