eleni.mutantstargoat.com Git - webkit_codecamp/blob - codecamp.tex

   1 \documentclass[usenames,dvipsnames]{beamer}
   2 \usepackage[font=small,skip=-1pt]{caption}
   3 \usepackage{xcolor}
   4 \usepackage{color, colortbl}
   5 \usepackage{caption}
   6 \usepackage{listings}
   7 \usepackage{graphicx}
   8 \usepackage{hyperref}
   9 \usepackage{comment}
  10 \usepackage{textpos}
  11 \usepackage{tgpagella}
  12 \usepackage[utf8]{inputenc}
  13 \usepackage{fontspec}
  14 \usepackage{tabularx, array, booktabs}
  15 \usepackage{cite}
  16 \usepackage{verbatim}
  17 \usepackage{comment}
  18 \usepackage{adjustbox}
  19
  20 \newcommand\topalign[1]{%
  21   \setbox0\hbox{#1}%
  22   \raisebox{\dimexpr-\ht0+\dp0\relax}{\usebox0}}
  23
  24 \definecolor{blond}{rgb}{0.98, 0.94, 0.75}
  25 \definecolor{beige}{rgb}{0.96, 0.96, 0.86}
  26 \definecolor{mGreen}{rgb}{0,0.6,0}
  27 \definecolor{mGray}{rgb}{0.5,0.5,0.5}
  28 \definecolor{mPurple}{rgb}{0.58,0,0.82}
  29 \definecolor{bgcolor}{rgb}{0.8,0.8,0.8}
  30 \definecolor{afblue}{rgb}{0.36, 0.54, 0.66}
  31 \definecolor{coolblack}{rgb}{0.0, 0.18, 0.39}
  32 \definecolor{paleaqua}{rgb}{0.74, 0.83, 0.9}
  33 \definecolor{platinum}{rgb}{0.9, 0.89, 0.89}
  34 \definecolor{whitesmoke}{rgb}{0.96, 0.96, 0.96}
  35 \definecolor{carolinablue}{rgb}{0.6, 0.73, 0.89}
  36 \definecolor{amber}{rgb}{1.0, 0.75, 0.0}
  37 \definecolor{deepjunglegreen}{rgb}{0.0, 0.29, 0.29}
  38 \definecolor{mediumred-violet}{rgb}{0.63, 0.1, 0.42}
  39 \definecolor{babypink}{rgb}{0.96, 0.76, 0.76}
  40 \definecolor{beaublue}{rgb}{0.74, 0.83, 0.9}
  41 \definecolor{bananayellow}{rgb}{1.0, 0.88, 0.21}
  42 \definecolor{bananamania}{rgb}{0.98, 0.91, 0.81}
  43 \definecolor{crimsonglory}{rgb}{0.75, 0.0, 0.2}
  44
  45 \lstdefinestyle{CStyle}{
  46         language=C++,                % choose the language of the code
  47 %       basicstyle=\footnotesize,       % the size of the fonts that are used for the code
  48         basicstyle=\tt\color{afblue},
  49     breakatwhitespace=false,
  50     breaklines=true,
  51         backgroundcolor=\color{bgcolor},  % choose the background color. You must add \usepackage{color}
  52         showspaces=false,               % show spaces adding particular underscores
  53         showstringspaces=false,         % underline spaces within strings
  54         showtabs=false,                 % show tabs within strings adding particular underscores
  55         frame=single,           % adds a frame around the code
  56         tabsize=2,          % sets default tabsize to 2 spaces
  57         captionpos=b,           % sets the caption-position to bottom
  58         breaklines=true,        % sets automatic line breaking
  59         breakatwhitespace=false,    % sets if automatic breaks should only happen at whitespace
  60     commentstyle=\color{mGreen},
  61     keywordstyle=\color{magenta},
  62     stringstyle=\color{mPurple},
  63         rulesepcolor=\color{gray},
  64     rulecolor=\color{black},
  65 }
  66
  67 \setmainfont{Noto Sans} % substitute with any font that exists on your system
  68 \setsansfont{Noto Sans} % substitute with any font that exists on your system
  69 \setmonofont{Noto Sans Mono Medium} % substitute with any font that exists on your system
  70
  71 \usetheme{Warsaw}
  72 \useoutertheme{infolines}
  73 \usecolortheme{crane}
  74
  75 \captionsetup[figure]{labelformat=empty}
  76
  77 \addtobeamertemplate{headline}{}{\vskip2pt}
  78 \addtobeamertemplate{headline}{}{%
  79         \begin{textblock*}{5mm}(.9\textwidth,-0.6cm)
  80         \includegraphics[height=0.67cm]{data/igalia-logo.png}
  81 \end{textblock*}}
  82
  83 \definecolor{links}{rgb}{0.1, 0.3, 0.6}
  84 \hypersetup{colorlinks,linkcolor=,urlcolor=links}
  85
  86 \pgfdeclareimage[height=\paperheight]{igaliabglight}{data/igalia_bg_light.eps}
  87 \pgfdeclareimage[height=\paperheight]{igaliabg}{data/igaliabg.eps}
  88
  89 %\setbeamertemplate{title page}{
  90 %        \begin{picture}(-90, 180)
  91 %                       \put(-200, -74){%
  92 %                \pgfuseimage{igaliabg}
  93 %            }
  94 %
  95 %            \put(55,19){%
  96 %                               \begin{minipage}[b][36mm][t]{240mm}
  97 %                    \usebeamerfont{title}{\inserttitle\par}
  98 %                    \usebeamerfont{author}{\insertauthor\par}
  99 %                    \usebeamerfont{title}{\insertinstitute\par}
 100 %                \end{minipage}
 101 %            }
 102 %               \end{picture}
 103 %}
 104
 105 \setbeamertemplate{navigation symbols}{}
 106 \setbeamertemplate{title page}{
 107         \begin{picture}(0,0)
 108             \put(-30,-164){%
 109                 \pgfuseimage{igaliabg}
 110             }
 111
 112             \put(0,-110.7){%
 113                 \begin{minipage}[b][38mm][t]{220mm}
 114                     \usebeamerfont{title}{\inserttitle\par}
 115                     \usebeamerfont{author}{\insertauthor\par}
 116                 \end{minipage}
 117             }
 118
 119                         \put(240, -138){
 120                                 \usebeamerfont{date}{\huge{{\insertdate}}\par}
 121                                 }
 122                 \end{picture}
 123 }
 124
 125 \setbeamertemplate{itemize items}[triangle]
 126 \setbeamertemplate{itemize subitem}[circle]
 127 \setbeamerfont{frametitle}{size=\small}
 128
 129 \setbeamertemplate{blocks}[default]
 130 \setbeamercolor{block title}{fg=amber,bg=black}
 131
 132 \title{\textbf{Sharing texture data across EGL drivers}}
 133 \author[Eleni Maria Stea <estea@igalia.com>]{\small{Eleni Maria Stea
 134 <estea@igalia.com>}\\\\\includegraphics{data/igalia.eps}}
 135 \date{\tiny{WebKit Codecamp}}
 136
 137 \AtBeginSection[]
 138 {
 139   \begin{frame}
 140     \frametitle{Outline}
 141         \tableofcontents[currentsection]
 142   \end{frame}
 143 }
 144
 145 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 146 \begin{document}
 147 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 148
 149 \begin{frame}[plain]
 150 \titlepage
 151 \end{frame}
 152
 153 \begin{frame}
 154         \frametitle{Outline}
 155         \tableofcontents
 156 \end{frame}
 157
 158 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 159
 160 \begin{comment}
 161 \begin{frame}[fragile,c]
 162     \frametitle{}
 163     \begin{center}
 164     \end{center}
 165 \end{frame}
 166 \end{comment}
 167
 168 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 169 \section[Introduction]{Introduction: Using ANGLE in WebGL2 (WebKit)}
 170 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 171
 172 \begin{frame}[fragile,c]
 173     \frametitle{A few words about ANGLE}
 174         \center{\textbf{\color{coolblack}{ANGLE is an EGL/GLESv2 implementation}}}
 175
 176         \setbeamertemplate{itemize/enumerate body begin}{\scriptsize}
 177         \setbeamertemplate{itemize/enumerate subbody begin}{\tiny}
 178         \setbeamertemplate{itemize/enumerate subsubbody begin}{\tiny}
 179         \setbeamertemplate{itemize items}[triangle]
 180     \setbeamertemplate{blocks}[rounded]
 181
 182         \vspace{0.3cm}
 183     \begin{block}{\color{afblue}{\scriptsize\textbf{EGL/GLESv2}:}}
 184                 \begin{itemize}
 185                         \itemsep0.2cm
 186             \item GLESv2 is used to render graphics using the GPU (graphics
 187                 API).
 188             \item EGL is used to create a GLESv2 context.
 189         \end{itemize}
 190         \end{block}
 191         \vspace{0.3cm}
 192
 193     \begin{block}{\color{afblue}{\scriptsize\textbf{ANGLE EGL/GLESv2}:}}
 194                 \begin{itemize}
 195                         \itemsep0.2cm
 196                         \item GLESv2 is implemented \textbf{on top of other APIs} (OpenGL,
 197                 Vulkan, GLESv2). EGL too (EGL, GLX, gbm, headless display).
 198             \item Users can select the most convenient backend using some
 199                 \textbf{ANGLE EGL extensions} (\texttt{eglext\_angle.h}) that
 200                 provide extra attributes to some standard EGL API stucts.
 201                         \item Primary \textbf{purpose} of ANGLE is to provide EGL/GLESv2 to systems
 202                 lacking it.
 203         \end{itemize}
 204         \end{block}
 205
 206         \vspace{0.2cm}
 207 \end{frame}
 208
 209 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 210
 211 \begin{frame}[fragile,c]
 212     \frametitle{Using ANGLE in WebKit}
 213
 214     \center{\textbf{\color{coolblack}{Using ANGLE (EGL/GLESv2 backend) in WebGL2 }}}
 215         \vspace{0.2cm}
 216
 217         \setbeamertemplate{itemize/enumerate body begin}{\scriptsize}
 218         \setbeamertemplate{itemize/enumerate subbody begin}{\tiny}
 219         \setbeamertemplate{itemize/enumerate subsubbody begin}{\tiny}
 220         \setbeamertemplate{itemize items}[triangle]
 221         \setbeamertemplate{blocks}[rounded]
 222
 223         \vspace{0.1cm}
 224
 225     \begin{block}{\color{afblue}{\scriptsize\textbf{Reasons}:}}
 226                 \begin{itemize}
 227             \item better performance in some cases (Žan Doberšek)
 228             \item it'll be mostly an optimized wrapper around the native driver (libGLES*
 229                                 is available on Linux desktop!)
 230         \end{itemize}
 231         \end{block}
 232         \vspace{0.3cm}
 233     \begin{block}{\color{afblue}{\scriptsize\textbf{Problem}:}}
 234                 \begin{itemize}
 235                         \item \textbf{ANGLE} renders on a \textbf{GLESv2 texture} created by ANGLE context
 236                         \item {\color{coolblack}WebKit \textbf{graphics pipeline} components use
 237                                 \textbf{OpenGL textures} that
 238                                 are composited by the WebKit compositor}
 239             \item We are currently \textbf{\textit{copying}} the ANGLE texture data to
 240                 an OpenGL texture to assemble the final image and this is
 241                 \textbf{\textit{slow}}!
 242         \end{itemize}
 243         \end{block}
 244
 245         \vspace{0.1cm}
 246
 247     \center{\textbf{\color{coolblack}{We need to replace this copy with
 248     something better!}}}
 249
 250         \vspace{0.2cm}
 251 \end{frame}
 252
 253 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 254
 255 \begin{frame}[fragile,c]
 256     \frametitle{Experiments on Linux}
 257
 258     \vspace{0.3cm}
 259     {\footnotesize{
 260         \begin{enumerate}
 261         \itemsep0.3cm
 262         \item {\color{coolblack}\textbf{Use ANGLE and EGL in the same program:
 263             create 2 X11 windows, and draw 2 images from 2 different contexts
 264                 by 2 different drivers.}
 265
 266                 \tiny{{(In several cases ANGLE behaves
 267                 different from EGL: e.g. when \texttt{eglMakeCurrent} doesn't
 268                 call \texttt{eglMakeCurrent}!!).}}
 269                 }
 270             \item {\color{coolblack}\textbf{Fix the problem with shared
 271                 context and shared textures.}
 272
 273                 \tiny{{(required
 274                 modifications in ANGLE OpenGL driver, writing an ANGLE extension, forcing the
 275                 EGL/OpenGL backend, and it wouldn't work with multiple
 276                 processes)}}
 277                 }
 278             \item {\color{coolblack}\textbf{Fix the problem by sharing a Linux kernel
 279                 dma-buf buffer across drivers.}
 280
 281                 \tiny{{(drivers must support some EGL/GL extensions, but both mesa and
 282                 ANGLE support them)}}
 283                 }
 284             \item {\color{coolblack}\textbf{Solve the multiple processes case.}
 285
 286                 \tiny{{(we need some sort of IPC to exchange the dma-buf FD)}}
 287                 }
 288         \end{enumerate}
 289     }}
 290 \end{frame}
 291
 292 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 293 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 294 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 295 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 296 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 297 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 298
 299 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 300 \section[Experiment 1]{Experiment 1: Using ANGLE and the native system driver in the same
 301 program}
 302 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 303
 304 \begin{frame}[fragile,c]
 305     \frametitle{Step 1: Setting up to debug ANGLE with GDB}
 306
 307         \vspace{0.2cm}
 308
 309     \begin{center}
 310                 \scriptsize{
 311                 I've ran my experiments using test programs and ANGLE,\\
 312                 and I had to
 313                 \textbf{\color{mediumred-violet}modify the default set up} to
 314                 debug/explore ANGLE calls with GDB:
 315                 }
 316     \end{center}
 317
 318         \vspace{0.1cm}
 319
 320         \setbeamertemplate{blocks}[rounded]
 321
 322         \begin{block}{\footnotesize{\textbf{Problems when building ANGLE for
 323         debugging:}}}\scriptsize{\texttt{
 324                 \begin{itemize}
 325                         \itemsep0.1cm
 326                                 \color{coolblack}
 327                         \item {{Default \textbf{gn} configuration redirects debugging
 328                                 symbols into separate files where GDB can't find them.}}
 329                         \item {\textbf{GDB} doesn't know where to find the ANGLE
 330                                 installation directories.}
 331                         \item {{\textbf{dwarf5} is not fully implemented on GDB, and so it's
 332                                 impossible to step without errors when it's enabled.}}
 333                         \item {\textbf{Debugging symbols} aren't enabled by default.}
 334                 \end{itemize}}}
 335         \vspace{0.2cm}
 336         \end{block}
 337
 338         \vspace{0.3cm}
 339
 340         \scriptsize{
 341                 \setbeamertemplate{itemize item}[circle]
 342         \begin{itemize}
 343                 \item {\textbf{Blog post} on how to set up
 344                         \textbf{\color{mediumred-violet}{ANGLE}} and \textbf{\color{mediumred-violet}{GDB}} for debugging: \url{https://eleni.mutantstargoat.com/hikiko/debug-angle/}}
 345                 \item {\textbf{Gist} with the \textbf{\color{mediumred-violet}{GN args}}
 346                         I've used: \url{https://gistof.com/gnargs}}
 347         \end{itemize}}
 348         \vspace{0.2cm}
 349 \end{frame}
 350
 351 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 352
 353 \begin{frame}[fragile,c]
 354     \frametitle{Step 2: Contexts from two drivers in the same
 355     program 1/2}
 356
 357         \setbeamertemplate{itemize/enumerate body begin}{\scriptsize}
 358         \setbeamertemplate{itemize/enumerate subbody begin}{\tiny}
 359         \setbeamertemplate{itemize/enumerate subsubbody begin}{\tiny}
 360         \setbeamertemplate{itemize items}[triangle]
 361         \setbeamertemplate{blocks}[rounded]
 362
 363         \begin{center}
 364         \textbf{\color{coolblack}First Test}
 365         \end{center}
 366         \vspace{-0.1cm}
 367         \scriptsize{\color{coolblack}
 368         I've first written a program where both ANGLE and native system driver render
 369         images on two different X11 windows and displayed them side by side:
 370         }
 371         \vspace{-0.1cm}
 372         \begin{center}
 373         \adjustbox{valign=t, margin=1ex,
 374         padding=1ex}{\includegraphics[height=1.5cm]{data/angle_egl.png}}
 375         \end{center}
 376         \vspace{-0.1cm}
 377         \begin{block}{\footnotesize{Things I had to take care of:}}
 378         \begin{itemize}
 379                 \item {Set ANGLE \textbf{library paths} in Makefile and link
 380                         with native system EGL.}
 381                 \item {\textbf{Dynamically open} ANGLE EGL and load its functions prefixed with
 382                         \texttt{angle\_} to distinguish them from native EGL ones.}
 383                 \item {Do the same for GLESv2.}
 384                 \item {\textbf{Invalidate the ANGLE context} at every display call.\\
 385                         (\textit{When ANGLE is not the only
 386                         implementation available \texttt{MakeCurrent} is not working as
 387                         expected!!!})}
 388         \end{itemize}
 389         \end{block}
 390 \end{frame}
 391
 392 \begin{frame}[fragile,c]
 393     \frametitle{Step 2: Contexts from two drivers in the same
 394     program 2/2}
 395         \vspace{0.1cm}
 396         \begin{center}
 397                 \textbf{\color{coolblack}Why invalidate the ANGLE context before MakeCurrent?}
 398                 \\
 399                 \begin{table}[c]
 400                         \begin{tabularx}{\textwidth}{l X}
 401                                 \tiny{\textbf{\color{mediumred-violet}Context is cached in ANGLE!}} &
 402                                 \adjustbox{valign=c, margin=0.1ex,
 403                                 padding=0.1ex}{\includegraphics[height=2cm]{data/makecurrent.png}} \\
 404                         \end{tabularx}
 405                 \end{table}
 406         \end{center}
 407
 408         \vspace{-0.1cm}
 409         \begin{center}
 410                 \textbf{\color{coolblack}More on Makefile changes and dynamic loading:}
 411         \end{center}
 412
 413         \setbeamertemplate{itemize/enumerate body begin}{\tiny}
 414         \setbeamertemplate{itemize items}[circle]
 415
 416         \tiny{
 417         \textbf{\texttt{\color{black}{Blog post:}}}
 418         {Sharing texture data between ANGLE and the native system driver:\\
 419         \url{https://eleni.mutantstargoat.com/hikiko/angle-dma/}}\\
 420         \vspace{0.1cm}
 421         \begin{itemize}
 422             \itemsep0.1cm
 423             \item
 424                 {\color{black}Step 1: Using
 425                 both libraries in the same program.}
 426             \item
 427                 {\color{black}{About ANGLE MakeCurrent.}}
 428         \end{itemize}
 429
 430         \vspace{0.3cm}
 431
 432         \color{black}{\textbf{\texttt{Code:}}}
 433         {\url{https://github.com/hikiko/shctx/tree/wip/system\_egl\_dynamic\_angle}}
 434
 435         }
 436 \end{frame}
 437
 438 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 439
 440 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 441 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 442 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 443 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 444 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 445
 446 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 447 \section[Experiment 2]{Experiment 2: Sharing a texture across drivers using shared context}
 448 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 449
 450 \begin{frame}[fragile,c]
 451     \frametitle{Shared Context}
 452     \begin{center}
 453         \scriptsize{
 454             \textbf{\color{coolblack}{A texture can be accessed by multiple OpenGL or
 455             GLESv2 contexts when these contexts are \textit{shared}:}}
 456         }
 457         \vspace{0.001cm}
 458         \texttt{
 459             \begin{table}[h]
 460                 \centering
 461                 \begin{adjustbox}{max width=\textwidth}
 462                     \begin{tabular}{|l|}
 463                         \hline
 464                         \rowcolor{platinum}
 465                         \\
 466                         \rowcolor{platinum}
 467                         \textbf{new\_ctx} = {\color{mediumred-violet}eglCreateContext}(new\_ctx\_dpy, new\_ctx\_config,
 468                         \textbf{native\_ctx}, new\_ctx\_attrib);\\
 469                         \rowcolor{platinum}\\
 470                         \hline
 471                     \end{tabular}
 472                 \end{adjustbox}
 473             \end{table}
 474         }
 475
 476         \vspace{0.1cm}
 477         \scriptsize{
 478             \textbf{\color{coolblack}{A texture generated by each context can be bound and used by the
 479             other\\ without ever leaving the GPU!}}
 480         }
 481         \vspace{0.01cm}
 482
 483         \tiny{
 484             \texttt{
 485                 \begin{table}[h]
 486                     \centering
 487                     \begin{adjustbox}{max width=\textwidth}
 488                         \begin{tabular}{|l|}
 489                             \rowcolor{platinum}
 490                             \hline
 491                             \rowcolor{platinum}
 492                             \\
 493                             \rowcolor{platinum}
 494                         glBindTexture({\color{mediumred-violet}GL\_TEXTURE\_2D}, \textbf{\color{afblue}gl\_shared\_tex});\\
 495                             \rowcolor{platinum}
 496                         {\color{darkgray}/* ... gl operations ... */}\\
 497                             \rowcolor{platinum}
 498                         \\
 499                             \rowcolor{platinum}
 500                         angle\_glBindTexture({\color{mediumred-violet}GL\_TEXTURE\_2D}, \textbf{\color{afblue}gl\_shared\_tex});\\
 501                             \rowcolor{platinum}
 502                         {\color{darkgray}/* ... angle\_gl operations ... */}\\
 503                             \rowcolor{platinum}
 504                         \\\hline
 505                     \end{tabular}
 506                     \end{adjustbox}
 507                 \end{table}
 508             }}
 509
 510     \vspace{0.2cm}
 511         \setbeamertemplate{itemize/enumerate body begin}{\tiny}
 512         \setbeamertemplate{itemize items}[triangle]
 513
 514         %\setbeamertemplate{blocks}
 515         \scriptsize{  \textbf{\color{coolblack}{Shared context restrictions:}}}
 516         \vspace{0.1cm}
 517         \begin{itemize}
 518             \item Contexts must be created by the \textbf{same API} (both OpenGL,
 519                 or both GLESv2, same driver).
 520             \item Contexts must be created by the \textbf{same
 521                 process}.(\textbf{=>
 522                 {\color{coolblack}{not
 523                 suitable for every project!}}})
 524         \end{itemize}
 525     \end{center}
 526 \end{frame}
 527
 528 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 529
 530 \begin{frame}[fragile,c]
 531     \frametitle{Could we use shared context in WebKit?}
 532
 533         \setbeamertemplate{itemize/enumerate body begin}{\tiny}
 534         \setbeamertemplate{itemize items}[triangle]
 535     \begin{center}
 536         \scriptsize{
 537             \textbf{\color{coolblack} Could we use shared context in WebKit?}\\
 538
 539             \vspace{0.2cm}
 540
 541             \textbf{Short answer:} Currently yes (with some workaround) but not in the
 542             future.
 543
 544             \vspace{0.3cm}
 545
 546             \begin{block}{Requirements to use shared context/textures in \textbf{WebKit}:}
 547                 \begin{itemize}
 548                     \item We should use the \textbf{ANGLE EGL/OpenGL backend in
 549                         WebGL2} to
 550                         match the main Graphics Pipeline API/driver (both contexts
 551                         should be OpenGL or GLESv2 and from the same driver!)
 552                     \item We'd need an \textbf{ANGLE extension} to allow passing
 553                         native shared context to ANGLE's eglCreateContext instead of
 554                         ANGLE shared context.
 555                     \item We should never move WebGL2 and Graphics Pipeline in
 556                         different processes. Shared contexts should be created by
 557                         the same process! (\textbf{Reason we've rejected this
 558                         method}).
 559                 \end{itemize}
 560             \end{block}
 561         }
 562
 563         \vspace{0.3cm}
 564
 565         \tiny{
 566             \textbf{\color{coolblack}{NEW}} ANGLE extension:\\
 567             \texttt{EGL\_ANGLE\_native\_shared\_context}
 568
 569             \vspace{0.2cm}
 570
 571
 572             \textbf{\color{coolblack}NEW} \texttt{\color{afblue}EGLAttrib} attribute can be passed
 573             to \texttt{\color{afblue}eglCreateContext}:\\
 574             \texttt{EGL\_NATIVE\_SHARED\_CONTEXT\_ANGLE}
 575
 576             \vspace{0.3cm}
 577             {\color{coolblack}
 578             This attribute indicates that the shared context in
 579             \texttt{\color{deepjunglegreen}eglCreateContext}
 580             is \textbf{not ANGLE} and should be used as native in the internal
 581             implementation.
 582             }
 583         }
 584     \end{center}
 585 \end{frame}
 586
 587 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 588 \begin{frame}[fragile,c]
 589     \frametitle{EGL\_ANGLE\_native\_shared\_context}
 590
 591         \setbeamertemplate{itemize/enumerate body begin}{\tiny}
 592     \setbeamertemplate{itemize items}[triangle]{\tiny}
 593     \setbeamercolor{block body}{bg=white}
 594
 595     \begin{center}
 596         \tiny{
 597             \begin{block}{This is how we create shared OpenGL
 598                 context using EGL (system or ANGLE):}
 599                 \centering
 600                 \begin{adjustbox}{max width=\textwidth}
 601                     \adjustbox{valign=t}{\includegraphics[height=1.3cm]{data/shared_ctx1.png}}
 602                 \end{adjustbox}
 603
 604                 \begin{comment}
 605                 {\color{coolblack}
 606                 \begin{table}[t]
 607                     \centering
 608                     \begin{adjustbox}{max width=\textwidth}
 609                         \begin{tabular}{l}
 610                             · In case of system EGL \texttt{ctx\_A} and
 611                             \texttt{ctx\_B} are native
 612                             EGL contexts.\\
 613                             · In case of ANGLE they are ANGLE EGL contexts.\\
 614                         \end{tabular}
 615                     \end{adjustbox}
 616                 \end{table}
 617                 }
 618                 \end{comment}
 619             \end{block}
 620         }
 621
 622         \tiny{
 623         \begin{block}{This is how we'd create shared
 624         OpenGL context between native EGL and ANGLE EGL using
 625             \texttt{EGL\_ANGLE\_native\_shared\_context}:}
 626
 627             \vspace{0.2cm}
 628             \begin{itemize}
 629                 \item \tiny{We'd pass the native EGL context (created by the native system
 630                     driver) as {\color{black}shared context} to the
 631                     native OpenGL context that is created {\color{black}in the ANGLE
 632                     OpenGL backend} using the native system driver!}
 633                 \item \tiny{We'd need use the {\color{black}new EGL attribute
 634                     (\texttt{EGL\_NATIVE\_SHARED\_CONTEXT\_ANGLE})} to let ANGLE know
 635                     that the shared context \textit{\color{coolblack}is not ANGLE but native}
 636                     context!}
 637             \end{itemize}
 638             \vspace{-0.2cm}
 639
 640         \begin{table}[t]
 641             \centering
 642             \begin{tabular}{l}
 643                 \begin{adjustbox}{max width=\textwidth}
 644                     \adjustbox{valign=t}{\includegraphics[height=3.5cm]{data/shared_ctx2.png}}
 645                 \end{adjustbox}
 646             \end{tabular}
 647         \end{table}
 648         \end{block}
 649     }
 650
 651
 652     \end{center}
 653 \end{frame}
 654
 655 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 656 \begin{frame}[fragile,c]
 657     \frametitle{Some work on the shared context approach}
 658         \setbeamertemplate{itemize/enumerate body begin}{\tiny}
 659     \setbeamertemplate{itemize items}[triangle]{\tiny}
 660     \setbeamercolor{block body}{bg=white}
 661
 662     \begin{center}
 663         \begin{block}{\tiny{Extension
 664             \texttt{EGL\_NATIVE\_SHARED\_CONTEXT\_ANGLE}:}}
 665             \vspace{0.2cm}
 666             \tiny{
 667                 \begin{table}[h]
 668                     \centering
 669                         Worked on the extension implementation (draft state, there are
 670                         bugs).\\
 671                     \begin{tabular}{l}
 672                         \\
 673                         \textbf{Concept:}\\
 674                         \begin{adjustbox}{max width=\textwidth}
 675                             \adjustbox{valign=t}{\includegraphics[scale=0.2]{data/shared_ctx3.png}}
 676                         \end{adjustbox}\\
 677                     \end{tabular}
 678                 \end{table}
 679             }
 680         \end{block}
 681         \begin{block}{\tiny{Experimental programs (to test the extension and
 682             familiarize with the shared context concept):}}
 683             \begin{itemize}
 684                 \item A test program that uses EGL ctxA to create a texture and
 685                     EGL ctxB to display it on an X11 window.
 686                 \item The same program written in ANGLE (there were
 687                     differences!)
 688                 \item A test program that uses EGL ctxA to create a texture and
 689                     ANGLE EGL ctxB to display it on an X11 window.
 690                 \item Variations of the above:
 691                     \url{https://github.com/hikiko/shctx/branches}
 692             \end{itemize}
 693         \end{block}
 694     \end{center}
 695    \end{frame}
 696
 697 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 698    \begin{frame}
 699        \frametitle{Abandoned!}
 700        \begin{center}
 701            \textbf{\color{coolblack} Why not shared context?}
 702            \vspace{0.5cm}
 703
 704            {\footnotesize{
 705                \begin{itemize}
 706                    \item Shared context would be a nice and clean approach if we wanted to use
 707                        it with our current WebKit code.
 708                    \item But there is a plan to use \textbf{separate processes} for WebGL2 and
 709                                            the main graphics pipeline!! (Žan Doberšek)
 710                \end{itemize}
 711            }}
 712
 713            \vspace{0.5cm}
 714            \textbf{\color{coolblack} But there was a \textit{better} approach!}
 715        \end{center}
 716    \end{frame}
 717 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 718
 719 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 720 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 721 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 722 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 723
 724 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 725 \section[Experiment 3]{Experiment 3: Sharing texture data across drivers using kernel DMA buffers}
 726 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 727
 728 \begin{frame}
 729     \frametitle{DMA buffers for the win!}
 730
 731     \begin{center}
 732                 \textbf{\color{coolblack}Fortunately we are on Linux!}
 733
 734                 \setbeamercolor{block body}{bg=white}
 735                 \setbeamercolor{block title}{bg=white, fg=coolblack}
 736                 \begin{block}{\scriptsize{There is a Linux kernel framework that can be used for
 737                         content sharing across different Linux drivers!}}
 738
 739                         \vspace{-0.1cm}
 740                         \begin{table}[t]
 741                                 \centering
 742                                 \begin{tabular}{l}
 743                                         \begin{adjustbox}{max width=\textwidth}
 744                                                 \adjustbox{valign=t}{\includegraphics[height=3.1cm]{data/dma_buf_sharing.png}}
 745                                         \end{adjustbox}
 746                                 \end{tabular}
 747                         \end{table}
 748
 749                         \textbf{\scriptsize{\color{coolblack}A few things that need our attention:}}\\
 750                         \vspace{0.1cm}
 751
 752                         \setbeamertemplate{itemize/enumerate body begin}{\tiny}
 753                         \begin{itemize}
 754                                 \item There are {\color{coolblack}EGL and OpenGL/GLESv2
 755                                         extensions} to make this content sharing easier!
 756                                 \item It's {\color{coolblack}driver independent}!
 757                                 \item It works with {\color{coolblack}multiple processes}!
 758                                 \item As long as ANGLE can expose the required extensions to
 759                                         import a dma\_buf file descriptor this method is
 760                                         {\color{coolblack}"ANGLE backend
 761                                         independent"}!
 762                                 \item Works {\color{coolblack}only on Linux}... but in case of
 763                                         WPE we won't need to support other systems! (Žan Doberšek)
 764                         \end{itemize}
 765                 \end{block}
 766     \end{center}
 767 \end{frame}
 768
 769 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 770
 771 \begin{frame}
 772         \frametitle{Extensions and new approach}
 773
 774         \setbeamercolor{block body}{bg=white}
 775         \setbeamertemplate{itemize/enumerate body begin}{\tiny}
 776
 777         \begin{block}{\scriptsize{How the kernel DMA buffers would help us avoid copying
 778                 the WebGL texture data?}}
 779
 780                 \begin{center}
 781                         \begin{itemize}
 782                                 \item Each texture is backed by a Linux kernel dma\_buffer.
 783                                 \item Multiple textures can use the same dma buffer as backing
 784                                         storage if they meet some requirements.
 785                                 \item We can export the file descriptor of one buffer from one
 786                                         driver and use it to access the buffer from the other
 787                                         driver.
 788                                 \item So we can export the FD that corresponds to the compositor
 789                                         texture, import it in WebGL when we create the render target
 790                                         and when the WebGL texture is filled, the compositor texture
 791                                         will be also filled, as they share the backing storage!
 792                         \end{itemize}
 793                 \end{center}
 794         \end{block}
 795         \begin{block}{\scriptsize{EGL and GL extensions that can be used:}}
 796                 \begin{center}
 797                         \begin{itemize}
 798                                 \item
 799                                         \href{https://www.khronos.org/registry/EGL/extensions/MESA/EGL\_MESA\_image\_dma\_buf\_export.txt}{EGL\_MESA\_image\_dma\_buf\_export}:
 800                                         \\ This extension allows creating one or multiple Linux dma\_buf
 801                                         file descriptors from the EGLImage that corresponds to a texture.
 802                                 \item \href{https://www.khronos.org/registry/EGL/extensions/EXT/EGL\_EXT\_image\_dma\_buf\_import.txt}{EGL\_EXT\_image\_dma\_buf\_import}:
 803                                         \\ This extension allows creating an EGLImage (that will be used to create a
 804                                         texture) from one or multiple Linux dma\_buf file
 805                                         descriptors.
 806                                 \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}:
 807                                         \\ This extension builds on EGL\_EXT\_image\_dma\_buf\_import, in order to support
 808                                         format modifiers used for tiling, compression, and additional non-linear
 809                                         modes.
 810                                 \item \href{https://www.khronos.org/registry/OpenGL/extensions/OES/OES\_EGL\_image\_external.txt}{OES\_EGL\_image\_external}:
 811                                         \\ This extension provides a mechanism for creating EGLImage texture targets
 812                                         from EGLImages.
 813                         \end{itemize}
 814                 \end{center}
 815         \end{block}
 816 \end{frame}
 817
 818 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 819
 820 \begin{frame}
 821         \frametitle{Example:}
 822
 823         \setbeamercolor{block body}{bg=white}{\scriptsize}
 824         \setbeamertemplate{itemize/enumerate body begin}{\tiny}
 825
 826         \begin{block}{\scriptsize{I've written an example:}}
 827                 \begin{center}
 828                         \begin{itemize}
 829                                 \item First using EGL!\\
 830                                         Blog post: \url{https://eleni.mutantstargoat.com/hikiko/egl-dma-1/} \\
 831                                         Code: \url{https://gistof.com/dma-egl-version}
 832                                 \item Then using a native EGL context and a context from ANGLE!\\
 833                                         Blog post: \url{https://eleni.mutantstargoat.com/hikiko/angle-dma/}\\
 834                                         Code: \url{https://gistof.com/dmaangleeglversion}
 835                         \end{itemize}
 836                 \end{center}
 837         \end{block}
 838         \vspace{-0.3cm}
 839         \begin{block}{\scriptsize{Snippet from the exporter:}}
 840                 \vspace{-0.1cm}
 841                 \tiny{
 842                 \begin{table}[t]
 843                         \centering
 844                         \begin{tabular}{l}
 845                                 {\color{coolblack}Exporting a dma buffer from a texture
 846                                 \texttt{texA}:}\\
 847                                 \begin{adjustbox}{max width=\textwidth}
 848                                         \adjustbox{valign=t}{\includegraphics[height=4cm]{data/dma_export_and_struct.png}}
 849                                 \end{adjustbox}\\
 850                         \end{tabular}
 851                 \end{table}
 852                 }
 853         \end{block}
 854 \end{frame}
 855
 856 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 857
 858 \begin{frame}
 859         \frametitle{Example continued}
 860         \setbeamercolor{block body}{bg=white}{\scriptsize}
 861         \setbeamertemplate{itemize/enumerate body begin}{\tiny}
 862
 863         \begin{block}{\scriptsize{Snippets from the importer:}}
 864                 \vspace{-0.1cm}
 865                 \tiny{
 866                 \begin{table}[t]
 867                         \centering
 868                         \begin{tabular}{l}
 869                                 {\color{coolblack}Creating an EGLImage from the dma buffer using
 870                                 the exported fd and the exported modifiers:}\\
 871                                 \\
 872                                 \begin{adjustbox}{max width=\textwidth}
 873                                         \adjustbox{valign=t}{\includegraphics[height=3.5cm]{data/dma_import.png}}
 874                                 \end{adjustbox}\\
 875 \\
 876 \\
 877                                 {\color{coolblack}Creating a texture using that external
 878                                 EGLImage:}\\
 879                                 \\
 880                                 \begin{adjustbox}{max width=\textwidth}
 881                                         \adjustbox{valign=t}{\includegraphics[height=2cm]{data/dma_targetteture2does.png}}
 882                                 \end{adjustbox}\\
 883                         \end{tabular}
 884                 \end{table}
 885                 }
 886         \end{block}
 887 \end{frame}
 888
 889 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 890 \begin{frame}
 891         \frametitle{Test program}
 892
 893         \begin{block}{\scriptsize{An exporter-importer that uses ANGLE and native
 894                 EGL}}
 895                 \setbeamertemplate{itemize/enumerate body begin}{\scriptsize}
 896                 \begin{itemize}
 897                         \itemsep0.3cm
 898                         \itemsep0.2cm
 899                         \item First context is EGL/OpenGL like the one in main graphics
 900                                 pipeline.
 901                         \item Second is ANGLE with EGL/GLESv2 backend like the one in
 902                                 WebGL2.
 903                         \item EGL/OpenGL context creates an empty texture and exports the dma\_buf
 904                                 fd and all other information about the buffer.
 905                         \item ANGLE context creates another empty texture using the same
 906                                 dma\_buf and the import mechanism.
 907                         \item ANGLE context fills the emty ANGLE texture.
 908                         \item EGL/OpenGL context displays the previously empty OpenGL/EGL
 909                                 texture.
 910                         \item EGL/OpenGL texture contains what ANGLE texture had.
 911                         \item \textbf{We shared the ANGLE data without copying them!}
 912                 \end{itemize}
 913
 914         \end{block}
 915         \vspace{0.2cm}
 916         \scriptsize{
 917                 \begin{center}
 918                         \textbf{\color{coolblack}Check the blog posts for more details!}
 919                 \end{center}
 920                 }
 921 \end{frame}
 922 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 923
 924 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 925 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 926 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 927 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 928 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 929
 930 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 931 \section[Multiple Processes]{Multiple Processes}
 932 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 933
 934 \begin{frame}[fragile,c]
 935     \frametitle{What if WebGL and Graphics pipeline were separate processes?}
 936         \setbeamertemplate{blocks}[rounded]
 937
 938 \vspace{0.3cm}
 939     \center{
 940         \textbf{\small{There is a plan to split the main graphics pipeline and the WebGL2
 941     pipeline in two processes. (Žan Doberšek)}}}
 942
 943 \vspace{0.5cm}
 944         \begin{block}{Can we still use shared DMA buffers?}
 945         \footnotesize{
 946
 947     \begin{itemize}
 948        \itemsep0.3cm
 949        \item {\color{coolblack} \textbf{YES!} DMA buffers can be shared across
 950               multiple processes.}
 951                   \item {\color{coolblack} But we need some sort of \textbf{\textit{interprocess
 952                           communication}} to exchange the file descriptor.}
 953                   \item {\color{coolblack} This is a client-server
 954                           \textbf{\textit{example}} that uses unix
 955             sockets to pass the dma-buf FD from one process to the other:
 956                         \url{https://gitlab.com/blaztinn/dma-buf-texture-sharing}.}
 957             \end{itemize}
 958
 959         }
 960     \end{block}
 961 \vspace{0.3cm}
 962 \end{frame}
 963
 964 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 965
 966 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 967 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 968 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 969 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 970 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 971
 972 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 973 \section[WebKit Integration]{WebKit Integration}
 974 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 975
 976 \begin{frame}[fragile,c]
 977     \frametitle{WIP WebKit:}
 978         \center{\normalsize{\textbf{\color{coolblack}{Ongoing work on WebKit}}}}
 979
 980         \vspace{0.1cm}
 981         \begin{center}
 982                 \setbeamertemplate{itemize/enumerate body begin}{\scriptsize}
 983                 \setbeamertemplate{itemize/enumerate subbody begin}[circle]{\tiny}
 984                         \begin{itemize}
 985                                 \itemsep0.2cm
 986                                 \item The extensions to import dma-buf buffers in ANGLE are
 987                                         implemented and exposed to the user => {\color{coolblack}in WebGL we can easily import the main pipeline
 988                                         DMA buf when we create the render target!}
 989                                 \item The extension to export dma-buf buffers from EGL is
 990                                         supported on mesa => {\color{coolblack}we could run a check before creating
 991                                         the shared dma buffer and use either use it or fallback to
 992                                         something else (libgbm? copying?)}
 993                         \end{itemize}
 994         \end{center}
 995         \vspace{0.05cm}
 996         {\scriptsize{
 997         \begin{block}{DONE/WIP/TODO}
 998             \begin{itemize}
 999                 \item{Use the right CMake options (one can't simply enable
1000                     \texttt{USE\_ANGLE\_WEBGL}!):
1001                     \color{coolblack}{\textbf{FIXED }}}
1002                 \item{There were compile errors when ANGLE was used:
1003                     \color{coolblack}{\textbf{FIXED/Pending to send the patches}}}
1004                 \item{Link errors when ANGLE is used:
1005                     \color{coolblack}{\textbf{WIP/Partially FIXED}}}
1006                 \item{Copy replacement: \color{coolblack}{\textbf{WIP/TODO}}}
1007             \end{itemize}
1008         \end{block}
1009         }}
1010
1011 \end{frame}
1012
1013 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1014
1015 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1016 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1017 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1018 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1019 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1020
1021 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1022 \section[References]{References}
1023 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1024 %\setbeamertemplate{bibliography entry title}{}
1025 %\setbeamertemplate{bibliography entry location}{}
1026 %\setbeamertemplate{bibliography entry note}{}
1027 \setbeamerfont{bibliography item}{size=\footnotesize}
1028 \setbeamerfont{bibliography entry author}{size=\footnotesize}
1029 \setbeamerfont{bibliography entry title}{size=\footnotesize}
1030 \setbeamerfont{bibliography entry year}{size=\footnotesize}
1031 \setbeamerfont{bibliography entry note}{size=\footnotesize}
1032
1033 \begin{frame}[allowframebreaks]
1034         \frametitle{Links}
1035         \bibliographystyle{unsrt}
1036         \bibliography{bib/references.bib}
1037         \nocite{*}
1038 \end{frame}
1039
1040 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1041 \end{document}
1042 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%