X-Git-Url: https://eleni.mutantstargoat.com/git/?p=webkit_codecamp;a=blobdiff_plain;f=codecamp.tex;h=a89b2a92cac58e7a31f4104849251cd671b8763c;hp=6c41365b0ddee763b5c1dd880a1177e34b253844;hb=00fff1064313e541fe72c536c8304788a9d4c8a2;hpb=da72bf859e2bddc8876f2f7d705479c19c77eddf

diff --git a/codecamp.tex b/codecamp.tex
index 6c41365..a89b2a9 100644
--- a/codecamp.tex
+++ b/codecamp.tex
@@ -728,11 +728,165 @@ program}
     \frametitle{DMA buffers for the win!}
 
     \begin{center}
+		\textbf{\color{coolblack}Fortunately we are on Linux!}
+
+		\setbeamercolor{block body}{bg=white}
+		\setbeamercolor{block title}{bg=white, fg=coolblack}
+		\begin{block}{\scriptsize{There is a Linux kernel framework that can be used for
+			content sharing between different Linux drivers!}}
+
+			\vspace{-0.1cm}
+			\begin{table}[t]
+				\centering
+				\begin{tabular}{l}
+					\begin{adjustbox}{max width=\textwidth}
+						\adjustbox{valign=t}{\includegraphics[height=3.1cm]{data/dma_buf_sharing.png}}
+					\end{adjustbox}
+				\end{tabular}
+			\end{table}
+
+			\textbf{\scriptsize{\color{coolblack}A few things that need our attention:}}\\
+			\vspace{0.1cm}
+
+			\setbeamertemplate{itemize/enumerate body begin}{\tiny}
+			\begin{itemize}
+				\item There are {\color{coolblack}EGL and OpenGL/GLESv2
+					extensions} to make this content sharing easier!
+				\item It's {\color{coolblack}driver independent}!
+				\item It works with {\color{coolblack}multiple processes}!
+				\item As long as ANGLE can expose the required extensions to
+					import a dma\_buf file descriptor this method is
+					{\color{coolblack}"ANGLE backend
+					independent"}!
+				\item Works {\color{coolblack}only on Linux}... but in case of
+					WPE we won't need to support other systems! (Žan Doberšek)
+			\end{itemize}
+		\end{block}
     \end{center}
 \end{frame}
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
+\begin{frame}
+	\frametitle{Extensions and new approach}
+
+	\setbeamercolor{block body}{bg=white}
+	\setbeamertemplate{itemize/enumerate body begin}{\tiny}
+
+	\begin{block}{\scriptsize{How the kernel DMA buffers would help us avoid copying
+		the WebGL texture data?}}
+
+		\begin{center}
+			\begin{itemize}
+				\item Each texture is backed by a Linux kernel dma\_buffer.
+				\item Multiple textures can use the same dma buffer as backing
+					storage if they meet some requirements.
+				\item We can export the file descriptor of one buffer from one
+					driver and use it to access the buffer from the other
+					driver.
+				\item So we can export the FD that corresponds to the compositor
+					texture, import it in WebGL when we create the render target
+					and when the WebGL texture is filled, the compositor texture
+					will be also filled, as they share the backing storage!
+			\end{itemize}
+		\end{center}
+	\end{block}
+	\begin{block}{\scriptsize{EGL and GL extensions that can be used:}}
+		\begin{center}
+			\begin{itemize}
+				\item
+					\href{https://www.khronos.org/registry/EGL/extensions/MESA/EGL\_MESA\_image\_dma\_buf\_export.txt}{EGL\_MESA\_image\_dma\_buf\_export}:
+					\\ This extension allows creating one or multiple Linux dma\_buf
+					file descriptors from the EGLImage that corresponds to a texture.
+				\item \href{https://www.khronos.org/registry/EGL/extensions/EXT/EGL\_EXT\_image\_dma\_buf\_import.txt}{EGL\_EXT\_image\_dma\_buf\_import}:
+					\\ This extension allows creating an EGLImage (that will be used to create a
+					texture) from one or multiple Linux dma\_buf file
+					descriptors.
+				\item \href{https://www.khronos.org/registry/EGL/extensions/EXT/EGL\_EXT\_image\_dma\_buf\_import\_modifiers.txt}{EGL\_EXT\_image\_dma\_buf\_import\_modifiers}:
+					\\ This extension builds on EGL\_EXT\_image\_dma\_buf\_import, in order to support
+					format modifiers used for tiling, compression, and additional non-linear
+					modes.
+				\item \href{https://www.khronos.org/registry/OpenGL/extensions/OES/OES\_EGL\_image\_external.txt}{OES\_EGL\_image\_external}: 
+					\\ This extension provides a mechanism for creating EGLImage texture targets
+					from EGLImages.
+			\end{itemize}
+		\end{center}
+	\end{block}
+\end{frame}
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+\begin{frame}
+	\frametitle{Example:}
+
+	\setbeamercolor{block body}{bg=white}{\scriptsize}
+	\setbeamertemplate{itemize/enumerate body begin}{\tiny}
+
+	\begin{block}{\scriptsize{I've written an example:}}
+		\begin{center}
+			\begin{itemize}
+				\item First using EGL!\\
+					Blog post: \url{https://eleni.mutantstargoat.com/hikiko/egl-dma-1/} \\
+					Code: \url{https://gistof.com/dma-egl-version}
+				\item Then using a native EGL context and a context from ANGLE!\\
+					Blog post: \url{https://eleni.mutantstargoat.com/hikiko/angle-dma/}\\
+					Code: \url{https://gistof.com/dmaangleeglversion}
+			\end{itemize}
+		\end{center}
+	\end{block}
+	\vspace{-0.3cm}
+	\begin{block}{\scriptsize{Snippet from the exporter:}}
+		\vspace{-0.1cm}
+		\tiny{
+		\begin{table}[t]
+			\centering
+			\begin{tabular}{l}
+				{\color{coolblack}Exporting a dma buffer from a texture
+				\texttt{texA}:}\\ 
+				\begin{adjustbox}{max width=\textwidth}
+					\adjustbox{valign=t}{\includegraphics[height=4cm]{data/dma_export_and_struct.png}}
+				\end{adjustbox}\\
+			\end{tabular}
+		\end{table}
+		}
+	\end{block}
+\end{frame}
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+\begin{frame}
+	\frametitle{Example continued}
+	\setbeamercolor{block body}{bg=white}{\scriptsize}
+	\setbeamertemplate{itemize/enumerate body begin}{\tiny}
+
+	\begin{block}{\scriptsize{Snippets from the importer:}}
+		\vspace{-0.1cm}
+		\tiny{
+		\begin{table}[t]
+			\centering
+			\begin{tabular}{l}
+				{\color{coolblack}Creating an EGLImage from the dma buffer using
+				the exported fd and the exported modifiers:}\\ 
+				\\
+				\begin{adjustbox}{max width=\textwidth}
+					\adjustbox{valign=t}{\includegraphics[height=3.5cm]{data/dma_import.png}}
+				\end{adjustbox}\\
+\\
+\\
+				{\color{coolblack}Creating a texture using that external
+				EGLImage:}\\ 
+				\\
+				\begin{adjustbox}{max width=\textwidth}
+					\adjustbox{valign=t}{\includegraphics[height=2cm]{data/dma_targetteture2does.png}}
+				\end{adjustbox}\\
+			\end{tabular}
+		\end{table}
+		}
+	\end{block}
+\end{frame}
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%