\vspace{0.3cm}
- \begin{block}{Requirements to use shared context/textures in \textbf{WebKit}:}
+ \begin{block}{What would we need to change in \textbf{WebKit} for
+ shared context to work?}
\begin{itemize}
- \item We should use the \textbf{ANGLE EGL/OpenGL backend in
+ \item Force the \textbf{ANGLE EGL/OpenGL backend in
WebGL2} to
match the main Graphics Pipeline API/driver (both contexts
should be OpenGL or GLESv2 and from the same driver!)
\item We'd need an \textbf{ANGLE extension} to allow passing
native shared context to ANGLE's eglCreateContext instead of
ANGLE shared context.
- \item We should never move WebGL2 and Graphics Pipeline in
+ \item We should never split WebGL2 and Graphics Pipeline in
different processes. Shared contexts should be created by
the same process! (\textbf{Reason we've rejected this
method}).
OpenGL context between native EGL and ANGLE EGL using
\texttt{EGL\_ANGLE\_native\_shared\_context}:}
- \vspace{0.2cm}
- \begin{itemize}
- \item \tiny{We'd pass the native EGL context (created by the native system
- driver) as {\color{black}shared context} to the
- native OpenGL context that is created {\color{black}in the ANGLE
- OpenGL backend} using the native system driver!}
- \item \tiny{We'd need use the {\color{black}new EGL attribute
- (\texttt{EGL\_NATIVE\_SHARED\_CONTEXT\_ANGLE})} to let ANGLE know
- that the shared context \textit{\color{coolblack}is not ANGLE but native}
- context!}
- \end{itemize}
- \vspace{-0.2cm}
-
+ \vspace{0.5cm}
\begin{table}[t]
\centering
\begin{tabular}{l}
\setbeamercolor{block body}{bg=white}
\begin{center}
- \begin{block}{\tiny{Extension
- \texttt{EGL\_NATIVE\_SHARED\_CONTEXT\_ANGLE}:}}
+ \begin{block}{\tiny{What happens inside ANGLE
+ (with \texttt{EGL\_NATIVE\_SHARED\_CONTEXT\_ANGLE}):}}
\vspace{0.2cm}
\tiny{
\begin{table}[h]
\centering
- Worked on the extension implementation (draft state, there are
- bugs).\\
\begin{tabular}{l}
- \\
- \textbf{Concept:}\\
\begin{adjustbox}{max width=\textwidth}
\adjustbox{valign=t}{\includegraphics[scale=0.2]{data/shared_ctx3.png}}
- \end{adjustbox}\\
+ \end{adjustbox}
\end{tabular}
\end{table}
}
\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 for that
- purpose:}}
+% \begin{comment}
+% \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}
+% \end{comment}
+
+ \begin{block}{\scriptsize{EGL and GL extensions to share content across
+ drivers using dma\_buf buffers:}}
\begin{center}
\begin{itemize}
\item
\end{itemize}
\end{center}
\end{block}
+ \begin{block}{\scriptsize{Example Programs:}}
+ \begin{center}
+ \begin{itemize}
+ \item Associating two textures with the contents of the same
+ buffer without copy taking place.\\
+ Blog post: \url{https://eleni.mutantstargoat.com/hikiko/egl-dma-1/} \\
+ Code: \url{https://gistof.com/dma-egl-version}
+ \item Sharing texture data between ANGLE and the native system
+ driver using DMA buffers and EGL. \\
+ Blog post: \url{https://eleni.mutantstargoat.com/hikiko/angle-dma/}\\
+ Code: \url{https://gistof.com/dmaangleeglversion}
+ \end{itemize}
+ \end{center}
+ \end{block}
+
\end{frame}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\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 two native EGL contexts\\
- 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 created 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}}
+ \adjustbox{valign=t}{\includegraphics[height=6.5cm]{data/dma_export_and_struct.png}}
\end{adjustbox}\\
\end{tabular}
\end{table}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{frame}
- \frametitle{Test program}
+ \frametitle{Final test program (WORKS!)}
\begin{block}{\scriptsize{An exporter-importer that uses ANGLE and native
EGL}}
\setbeamertemplate{itemize/enumerate body begin}{\scriptsize}
\begin{itemize}
\itemsep0.3cm
- \itemsep0.2cm
\item First context is EGL/OpenGL like the one in main graphics
pipeline.
\item Second is ANGLE with EGL/GLESv2 backend like the one in
pipeline in two processes. (Žan Doberšek)}}}
\vspace{0.5cm}
+ \setbeamercolor{block body}{bg=white}{\scriptsize}
\begin{block}{Can we still use shared DMA buffers?}
\footnotesize{
projects / webkit_codecamp / commitdiff