\documentclass[english,aspectratio=169]{beamer} % TODO: for faster compilation: ,draft
% ,handout,notes=show
% ,notes=only

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\usepackage{babel,url,graphicx,booktabs,alltt,xcolor,listings}
\usepackage{subfig,hyperref}
\usepackage[utf8]{inputenc}
\usepackage[normalem]{ulem}

\graphicspath{ {img/} }

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\usepackage{perpage} %the perpage package
\MakePerPage{footnote} %the perpage package command

\title{\textbf{Lovebyte 256 second seminar: Gameboy/Gameboy Color Sizecoding}}
\author{\textbf{PoroCYon / K2\^{}TiTAN}}
\date{}

%\AtBeginSection[]
%{
%  \begin{frame}
%    \frametitle{Table of Contents}
%    \tableofcontents[currentsection]
%  \end{frame}
%}

\usetheme{Szeged}
\usecolortheme{seagull}

%\usetheme{Singapore}
%\usecolortheme{default}

%\usetheme{Hannover}
%\usecolortheme{default}

\begin{document}

\frame{\titlepage}

% frame options: plain (for large contents), shrink (lots of text), allowframebreaks, fragile
% \pause, <a-b>
% \begin{columns}[align] \begin{column}[align]{5cm} ...
% \begin{block,alertblock,exampleblock}
% \include, dan pas \input

\begin{frame}{What's a GB?}
	\begin{itemize}
		\item Z80-ish @ 4.2/8.4 MHz
		\item 8k/32k RAM, 8k/16k VRAM
		\item Background, window, 40 sprites (10/line)
	\end{itemize}
\end{frame}

\begin{frame}{Toolchains}
	\begin{description}
		\item[Assembler]: \texttt{rgbasm} from
			\texttt{rgbds}\footnote{\url{https://rgbds.gbdev.io/}}.
		\item[\texttt{rgbfix}]: to fix up cart headers (included in \texttt{rgbds})
		\item[HW docs]: Pan Docs\footnote{\url{https://gbdev.io/pandocs/}},
			GBDev wiki\footnote{\url{https://gbdev.gg8.se/wiki/articles/Main_Page}}
		\item[Emulator]: BGB, Gambatte, Sameboy, ...
	\end{description}
\end{frame}

\begin{frame}{Hurdle 1: cartridge entrypoint}
	\begin{itemize}
		\item Entrypoint at \texttt{+0x100} in file
		\item \texttt{+0x000}: RST, \texttt{+0x040}: IRQ (vblank etc)
	\end{itemize}

	~\\

	\begin{itemize}
		\item Skip RST and maybe IRQ, pad with zeros\footnote{
			\url{https://www.pouet.net/prod.php?which=70163} does this, too}
	\end{itemize}
\end{frame}

\begin{frame}{Hurdle 2: cartridge header}
	\begin{itemize}
		\item \texttt{+0x100}: Entry point
		\item \texttt{+0x104..0x133}: Nintendo logo (include in safe version!
			skip in emulator version)
		\item \texttt{+0x134..0x14f}: Cartridge metadata (title, CGB, ROM/RAM size, ...)
	\end{itemize}

	~\\

	\begin{itemize}
		\item Drop IRQs (zeroed out) when specific metadata values (eg. CGB
			mode) are needed
	\end{itemize}
\end{frame}

\begin{frame}{Graphics and sound}
	Graphics:
	\begin{itemize}
		\item Tiled background, 2bpp, scrollable
		\item Window: smaller background, no transparency, less controllable
		\item Sprites: similar format as background, 8x8 or 8x16
		\item CGB: palette of 32768 colors
		\item Init: \texttt{LCDC} register
	\end{itemize}

	Sound:
	\begin{itemize}
		\item 4-channel PSG
		\item More annoying to init (\texttt{NR50}, \texttt{NR51},
			\texttt{NR52})
	\end{itemize}
\end{frame}

\begin{frame}{Example prod}
	\begin{center}
		{\large ``Pocket party''\footnote{\url{https://www.pouet.net/prod.php?which=85348}}
		by PoroCYon/K2\^{}TiTAN\normalsize} (4k)

		\includegraphics[height=0.5\textheight]{pparty-screen.png}

		\begin{itemize}
			\item Most of the ROM is background image data
		\end{itemize}
	\end{center}
\end{frame}

\begin{frame}{Conclusion}
	\begin{center}
		{\Huge \textbf{Go make an intro!}}
	\end{center}
\end{frame}

%\begin{frame}{Questions}
%	\begin{center}
%		\Huge \textbf{Questions?}
%	\end{center}
%\end{frame}

\end{document}