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

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 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 modify the default set up to step into ANGLE calls with GDB:
 313                 }
 314     \end{center}
 315
 316         \vspace{0.1cm}
 317
 318         \setbeamertemplate{itemize/enumerate body begin}{\scriptsize}
 319         \begin{block}{\scriptsize{Things that need attention when building ANGLE for
 320         debugging:}}\scriptsize{
 321             \vspace{0.2cm}
 322                 \begin{itemize}
 323                         \itemsep0.1cm
 324                                 \color{coolblack}
 325                         \item {{Default \textbf{gn} configuration redirects debugging
 326                                 symbols into separate files where GDB can't find them.}}
 327                         \item {\textbf{GDB} doesn't know where to find the ANGLE
 328                                 installation directories.}
 329                         \item {{\textbf{dwarf5} is not fully implemented on GDB, and so it's
 330                                 impossible to step without errors when it's enabled.}}
 331                         \item {\textbf{Debugging symbols} aren't enabled by default.}
 332                 \end{itemize}}
 333         \vspace{0.2cm}
 334         \end{block}
 335
 336         \vspace{0.3cm}
 337
 338         \scriptsize{
 339                 \setbeamertemplate{itemize item}[circle]
 340         \begin{itemize}
 341                 \item {\textbf{Blog post} on how to set up
 342                         {\color{black}{ANGLE}} and {\color{black}{GDB}} for debugging: \url{https://eleni.mutantstargoat.com/hikiko/debug-angle/}}
 343                 \item {\textbf{Gist} with the {\color{black}{GN args}}
 344                         I've used: \url{https://gistof.com/gnargs}}
 345         \end{itemize}}
 346         \vspace{0.2cm}
 347 \end{frame}
 348
 349 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 350
 351 \begin{frame}[fragile,c]
 352     \frametitle{Step 2: Contexts from two drivers in the same
 353     program 1/2}
 354
 355         \setbeamertemplate{itemize/enumerate body begin}{\scriptsize}
 356         \setbeamertemplate{itemize/enumerate subbody begin}{\tiny}
 357         \setbeamertemplate{itemize/enumerate subsubbody begin}{\tiny}
 358         \setbeamertemplate{itemize items}[triangle]
 359
 360         \begin{center}
 361         \textbf{\color{coolblack}First Test}
 362         \end{center}
 363         \vspace{-0.1cm}
 364         \scriptsize{\color{coolblack}
 365         I've first written a program where both ANGLE and native system driver render
 366         images on two different X11 windows and displayed them side by side:
 367         }
 368         \vspace{-0.1cm}
 369         \begin{center}
 370         \adjustbox{valign=t, margin=1ex,
 371         padding=1ex}{\includegraphics[height=1.5cm]{data/angle_egl.png}}
 372         \end{center}
 373         \vspace{-0.1cm}
 374         \begin{block}{\footnotesize{Some parts that needed attention:}}
 375         \begin{itemize}
 376                 \item {Set ANGLE \textbf{library paths} in Makefile and link
 377                         with native system EGL.}
 378                 \item {\textbf{Dynamically open} ANGLE EGL and load its functions prefixed with
 379                         \texttt{angle\_} to distinguish them from native EGL ones.}
 380                 \item {Do the same for GLESv2.}
 381                 \item {\textbf{Invalidate the ANGLE context} at every display call.\\
 382                         (\textit{When ANGLE is not the only
 383                         implementation available \texttt{MakeCurrent} is not working as
 384                         expected!!!})}
 385         \end{itemize}
 386         \end{block}
 387 \end{frame}
 388
 389 \begin{frame}[fragile,c]
 390     \frametitle{Step 2: Contexts from two drivers in the same
 391     program 2/2}
 392         \vspace{0.1cm}
 393         \begin{center}
 394                 \textbf{\color{coolblack}Why invalidate the ANGLE context before MakeCurrent?}
 395                 \\
 396                 \begin{table}[c]
 397                         \begin{tabularx}{\textwidth}{l X}
 398                                 \tiny{\textbf{\color{mediumred-violet}Context is cached in ANGLE!}} &
 399                                 \adjustbox{valign=c, margin=0.1ex,
 400                                 padding=0.1ex}{\includegraphics[height=2cm]{data/makecurrent.png}} \\
 401                         \end{tabularx}
 402                 \end{table}
 403         \end{center}
 404
 405         \vspace{-0.1cm}
 406         \begin{center}
 407                 \textbf{\color{coolblack}More on Makefile changes and dynamic loading:}
 408         \end{center}
 409
 410         \setbeamertemplate{itemize/enumerate body begin}{\tiny}
 411         \setbeamertemplate{itemize items}[circle]
 412
 413         \tiny{
 414         \textbf{\texttt{\color{black}{Blog post:}}}
 415         {Sharing texture data between ANGLE and the native system driver:\\
 416         \url{https://eleni.mutantstargoat.com/hikiko/angle-dma/}}\\
 417         \vspace{0.1cm}
 418         \begin{itemize}
 419             \itemsep0.1cm
 420             \item
 421                 {\color{black}Step 1: Using
 422                 both libraries in the same program.}
 423             \item
 424                 {\color{black}{About ANGLE MakeCurrent.}}
 425         \end{itemize}
 426
 427         \vspace{0.3cm}
 428
 429         \color{black}{\textbf{\texttt{Code:}}}
 430         {\url{https://github.com/hikiko/shctx/tree/wip/system\_egl\_dynamic\_angle}}
 431
 432         }
 433 \end{frame}
 434
 435 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 436
 437 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 438 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 439 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 440 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 441 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 442
 443 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 444 \section[Experiment 2]{Experiment 2: Sharing a texture across drivers using shared context}
 445 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 446
 447 \begin{frame}[fragile,c]
 448     \frametitle{Shared Context}
 449     \begin{center}
 450         \scriptsize{
 451             \textbf{\color{coolblack}{A texture can be accessed by multiple OpenGL or
 452             GLESv2 contexts when these contexts are \textit{shared}:}}
 453         }
 454         \vspace{0.001cm}
 455         \texttt{
 456             \begin{table}[h]
 457                 \centering
 458                 \begin{adjustbox}{max width=\textwidth}
 459                     \begin{tabular}{|l|}
 460                         \hline
 461                         \rowcolor{platinum}
 462                         \\
 463                         \rowcolor{platinum}
 464                         \textbf{new\_ctx} = {\color{mediumred-violet}eglCreateContext}(new\_ctx\_dpy, new\_ctx\_config,
 465                         \textbf{native\_ctx}, new\_ctx\_attrib);\\
 466                         \rowcolor{platinum}\\
 467                         \hline
 468                     \end{tabular}
 469                 \end{adjustbox}
 470             \end{table}
 471         }
 472
 473         \vspace{0.1cm}
 474         \scriptsize{
 475             \textbf{\color{coolblack}{A texture generated by each context can be bound and used by the
 476             other\\ without ever leaving the GPU!}}
 477         }
 478         \vspace{0.01cm}
 479
 480         \tiny{
 481             \texttt{
 482                 \begin{table}[h]
 483                     \centering
 484                     \begin{adjustbox}{max width=\textwidth}
 485                         \begin{tabular}{|l|}
 486                             \rowcolor{platinum}
 487                             \hline
 488                             \rowcolor{platinum}
 489                             \\
 490                             \rowcolor{platinum}
 491                         glBindTexture({\color{mediumred-violet}GL\_TEXTURE\_2D}, \textbf{\color{afblue}gl\_shared\_tex});\\
 492                             \rowcolor{platinum}
 493                         {\color{darkgray}/* ... gl operations ... */}\\
 494                             \rowcolor{platinum}
 495                         \\
 496                             \rowcolor{platinum}
 497                         angle\_glBindTexture({\color{mediumred-violet}GL\_TEXTURE\_2D}, \textbf{\color{afblue}gl\_shared\_tex});\\
 498                             \rowcolor{platinum}
 499                         {\color{darkgray}/* ... angle\_gl operations ... */}\\
 500                             \rowcolor{platinum}
 501                         \\\hline
 502                     \end{tabular}
 503                     \end{adjustbox}
 504                 \end{table}
 505             }}
 506
 507     \vspace{0.2cm}
 508         \setbeamertemplate{itemize/enumerate body begin}{\tiny}
 509         \setbeamertemplate{itemize items}[triangle]
 510
 511         %\setbeamertemplate{blocks}
 512         \scriptsize{  \textbf{\color{coolblack}{Shared context restrictions:}}}
 513         \vspace{0.1cm}
 514         \begin{itemize}
 515             \item Contexts must be created by the \textbf{same API} (both OpenGL,
 516                 or both GLESv2, same driver).
 517             \item Contexts must be created by the \textbf{same
 518                 process}.(\textbf{=>
 519                 {\color{coolblack}{not
 520                 suitable for every project!}}})
 521         \end{itemize}
 522     \end{center}
 523 \end{frame}
 524
 525 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 526
 527 \begin{frame}[fragile,c]
 528     \frametitle{Could we use shared context in WebKit?}
 529
 530         \setbeamertemplate{itemize/enumerate body begin}{\tiny}
 531         \setbeamertemplate{itemize items}[triangle]
 532     \begin{center}
 533         \scriptsize{
 534             \textbf{\color{coolblack} Could we use shared context in WebKit?}\\
 535
 536             \vspace{0.2cm}
 537
 538             \textbf{Short answer:} Currently yes (with some workaround) but not in the
 539             future.
 540
 541             \vspace{0.3cm}
 542
 543             \begin{block}{Requirements to use shared context/textures in \textbf{WebKit}:}
 544                 \begin{itemize}
 545                     \item We should use the \textbf{ANGLE EGL/OpenGL backend in
 546                         WebGL2} to
 547                         match the main Graphics Pipeline API/driver (both contexts
 548                         should be OpenGL or GLESv2 and from the same driver!)
 549                     \item We'd need an \textbf{ANGLE extension} to allow passing
 550                         native shared context to ANGLE's eglCreateContext instead of
 551                         ANGLE shared context.
 552                     \item We should never move WebGL2 and Graphics Pipeline in
 553                         different processes. Shared contexts should be created by
 554                         the same process! (\textbf{Reason we've rejected this
 555                         method}).
 556                 \end{itemize}
 557             \end{block}
 558         }
 559
 560         \vspace{0.3cm}
 561
 562         \tiny{
 563             \textbf{\color{coolblack}{NEW}} ANGLE extension:\\
 564             \texttt{EGL\_ANGLE\_native\_shared\_context}
 565
 566             \vspace{0.2cm}
 567
 568
 569             \textbf{\color{coolblack}NEW} \texttt{\color{afblue}EGLAttrib} attribute can be passed
 570             to \texttt{\color{afblue}eglCreateContext}:\\
 571             \texttt{EGL\_NATIVE\_SHARED\_CONTEXT\_ANGLE}
 572
 573             \vspace{0.3cm}
 574             {\color{coolblack}
 575             This attribute indicates that the shared context in
 576             \texttt{\color{deepjunglegreen}eglCreateContext}
 577             is \textbf{not ANGLE} and should be used as native in the internal
 578             implementation.
 579             }
 580         }
 581     \end{center}
 582 \end{frame}
 583
 584 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 585 \begin{frame}[fragile,c]
 586     \frametitle{EGL\_ANGLE\_native\_shared\_context}
 587
 588         \setbeamertemplate{itemize/enumerate body begin}{\tiny}
 589     \setbeamertemplate{itemize items}[triangle]{\tiny}
 590     \setbeamercolor{block body}{bg=white}
 591
 592     \begin{center}
 593         \tiny{
 594             \begin{block}{This is how we create shared OpenGL
 595                 context using EGL (system or ANGLE):}
 596                 \centering
 597                 \begin{adjustbox}{max width=\textwidth}
 598                     \adjustbox{valign=t}{\includegraphics[height=1.3cm]{data/shared_ctx1.png}}
 599                 \end{adjustbox}
 600
 601                 \begin{comment}
 602                 {\color{coolblack}
 603                 \begin{table}[t]
 604                     \centering
 605                     \begin{adjustbox}{max width=\textwidth}
 606                         \begin{tabular}{l}
 607                             · In case of system EGL \texttt{ctx\_A} and
 608                             \texttt{ctx\_B} are native
 609                             EGL contexts.\\
 610                             · In case of ANGLE they are ANGLE EGL contexts.\\
 611                         \end{tabular}
 612                     \end{adjustbox}
 613                 \end{table}
 614                 }
 615                 \end{comment}
 616             \end{block}
 617         }
 618
 619         \tiny{
 620         \begin{block}{This is how we'd create shared
 621         OpenGL context between native EGL and ANGLE EGL using
 622             \texttt{EGL\_ANGLE\_native\_shared\_context}:}
 623
 624             \vspace{0.2cm}
 625             \begin{itemize}
 626                 \item \tiny{We'd pass the native EGL context (created by the native system
 627                     driver) as {\color{black}shared context} to the
 628                     native OpenGL context that is created {\color{black}in the ANGLE
 629                     OpenGL backend} using the native system driver!}
 630                 \item \tiny{We'd need use the {\color{black}new EGL attribute
 631                     (\texttt{EGL\_NATIVE\_SHARED\_CONTEXT\_ANGLE})} to let ANGLE know
 632                     that the shared context \textit{\color{coolblack}is not ANGLE but native}
 633                     context!}
 634             \end{itemize}
 635             \vspace{-0.2cm}
 636
 637         \begin{table}[t]
 638             \centering
 639             \begin{tabular}{l}
 640                 \begin{adjustbox}{max width=\textwidth}
 641                     \adjustbox{valign=t}{\includegraphics[height=3.5cm]{data/shared_ctx2.png}}
 642                 \end{adjustbox}
 643             \end{tabular}
 644         \end{table}
 645         \end{block}
 646     }
 647
 648
 649     \end{center}
 650 \end{frame}
 651
 652 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 653 \begin{frame}[fragile,c]
 654     \frametitle{Some work on the shared context approach}
 655         \setbeamertemplate{itemize/enumerate body begin}{\tiny}
 656     \setbeamertemplate{itemize items}[triangle]{\tiny}
 657     \setbeamercolor{block body}{bg=white}
 658
 659     \begin{center}
 660         \begin{block}{\tiny{Extension
 661             \texttt{EGL\_NATIVE\_SHARED\_CONTEXT\_ANGLE}:}}
 662             \vspace{0.2cm}
 663             \tiny{
 664                 \begin{table}[h]
 665                     \centering
 666                         Worked on the extension implementation (draft state, there are
 667                         bugs).\\
 668                     \begin{tabular}{l}
 669                         \\
 670                         \textbf{Concept:}\\
 671                         \begin{adjustbox}{max width=\textwidth}
 672                             \adjustbox{valign=t}{\includegraphics[scale=0.2]{data/shared_ctx3.png}}
 673                         \end{adjustbox}\\
 674                     \end{tabular}
 675                 \end{table}
 676             }
 677         \end{block}
 678         \begin{block}{\tiny{Experimental programs (to test the extension and
 679             familiarize with the shared context concept):}}
 680             \begin{itemize}
 681                 \item A test program that uses EGL ctxA to create a texture and
 682                     EGL ctxB to display it on an X11 window.
 683                 \item The same program written in ANGLE (there were
 684                     differences!)
 685                 \item A test program that uses EGL ctxA to create a texture and
 686                     ANGLE EGL ctxB to display it on an X11 window.
 687                 \item Variations of the above:
 688                     \url{https://github.com/hikiko/shctx/branches}
 689             \end{itemize}
 690         \end{block}
 691     \end{center}
 692    \end{frame}
 693
 694 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 695    \begin{frame}
 696        \frametitle{Abandoned!}
 697        \begin{center}
 698            \textbf{\color{coolblack} Why not shared context?}
 699            \vspace{0.5cm}
 700
 701            {\footnotesize{
 702                \begin{itemize}
 703                    \item Shared context would be a nice and clean approach if we wanted to use
 704                        it with our current WebKit code.
 705                    \item But there is a plan to use \textbf{separate processes} for WebGL2 and
 706                                            the main graphics pipeline!! (Žan Doberšek)
 707                \end{itemize}
 708            }}
 709
 710            \vspace{0.5cm}
 711            \textbf{\color{coolblack} But there was a \textit{better} approach!}
 712        \end{center}
 713    \end{frame}
 714 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 715
 716 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 717 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 718 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 719 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 720
 721 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 722 \section[Experiment 3]{Experiment 3: Sharing texture data across drivers using kernel DMA buffers}
 723 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 724
 725 \begin{frame}
 726     \frametitle{DMA buffers for the win!}
 727
 728     \begin{center}
 729                 \textbf{\color{coolblack}Fortunately we are on Linux!}
 730
 731                 \setbeamercolor{block body}{bg=white}
 732                 \setbeamercolor{block title}{bg=white, fg=coolblack}
 733                 \begin{block}{\scriptsize{There is a Linux kernel framework that can be used for
 734                         content sharing across different Linux drivers!}}
 735
 736                         \vspace{-0.1cm}
 737                         \begin{table}[t]
 738                                 \centering
 739                                 \begin{tabular}{l}
 740                                         \begin{adjustbox}{max width=\textwidth}
 741                                                 \adjustbox{valign=t}{\includegraphics[height=3.1cm]{data/dma_buf_sharing.png}}
 742                                         \end{adjustbox}
 743                                 \end{tabular}
 744                         \end{table}
 745
 746                         \textbf{\scriptsize{\color{coolblack}A few interesting things about
 747             content sharing with dma buffers:}}\\
 748                         \vspace{0.1cm}
 749
 750                         \setbeamertemplate{itemize/enumerate body begin}{\tiny}
 751                         \begin{itemize}
 752                                 \item There are {\color{coolblack}EGL and OpenGL/GLESv2
 753                                         extensions} to make it easier!
 754                                 \item It's a {\color{coolblack}driver independent} method!
 755                                 \item It works with {\color{coolblack}multiple processes}!
 756                                 \item As long as ANGLE can expose the required extensions to
 757                                         import a dma\_buf file descriptor this method is also
 758                                         {\color{coolblack}"ANGLE backend
 759                                         independent"}!
 760                                 \item DMA buffers are a {\color{coolblack}Linux-only} thing...
 761                     but we won't need to support other systems! (Žan Doberšek)
 762                         \end{itemize}
 763                 \end{block}
 764     \end{center}
 765 \end{frame}
 766
 767 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 768
 769 \begin{frame}
 770         \frametitle{Extensions and new approach}
 771
 772         \setbeamercolor{block body}{bg=white}
 773         \setbeamertemplate{itemize/enumerate body begin}{\tiny}
 774
 775         \begin{block}{\scriptsize{How the kernel DMA buffers would help us avoid copying
 776                 the WebGL texture data?}}
 777
 778                 \begin{center}
 779                         \begin{itemize}
 780                                 \item Each texture is backed by a Linux kernel dma\_buffer.
 781                                 \item Multiple textures can use the same dma buffer as backing
 782                                         storage if they meet some requirements.
 783                                 \item We can export the file descriptor of one buffer from one
 784                                         driver and use it to access the buffer from the other
 785                                         driver.
 786                                 \item So we can export the fd that corresponds to the compositor
 787                                         texture, import it in WebGL when we create the render target
 788                                         and when the WebGL texture is filled, the compositor texture
 789                                         will be also filled, as they share the backing storage!
 790                         \end{itemize}
 791                 \end{center}
 792         \end{block}
 793
 794         \begin{block}{\scriptsize{EGL and GL extensions that can be used for that
 795         purpose:}}
 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 two native EGL contexts\\
 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 created from
 833                     ANGLE\\
 834                                         Blog post: \url{https://eleni.mutantstargoat.com/hikiko/angle-dma/}\\
 835                                         Code: \url{https://gistof.com/dmaangleeglversion}
 836                         \end{itemize}
 837                 \end{center}
 838         \end{block}
 839         \vspace{-0.3cm}
 840         \begin{block}{\scriptsize{Snippet from the exporter:}}
 841                 \vspace{-0.1cm}
 842                 \tiny{
 843                 \begin{table}[t]
 844                         \centering
 845                         \begin{tabular}{l}
 846                                 {\color{coolblack}Exporting a dma buffer from a texture
 847                                 \texttt{texA}:}\\
 848                                 \begin{adjustbox}{max width=\textwidth}
 849                                         \adjustbox{valign=t}{\includegraphics[height=4cm]{data/dma_export_and_struct.png}}
 850                                 \end{adjustbox}\\
 851                         \end{tabular}
 852                 \end{table}
 853                 }
 854         \end{block}
 855 \end{frame}
 856
 857 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 858
 859 \begin{frame}
 860         \frametitle{Example continued}
 861         \setbeamercolor{block body}{bg=white}{\scriptsize}
 862         \setbeamertemplate{itemize/enumerate body begin}{\tiny}
 863
 864         \begin{block}{\scriptsize{Snippets from the importer:}}
 865                 \vspace{-0.1cm}
 866                 \tiny{
 867                 \begin{table}[t]
 868                         \centering
 869                         \begin{tabular}{l}
 870                                 {\color{coolblack}Creating an EGLImage from the dma buffer using
 871                                 the exported fd and the exported modifiers:}\\
 872                                 \\
 873                                 \begin{adjustbox}{max width=\textwidth}
 874                                         \adjustbox{valign=t}{\includegraphics[height=3.5cm]{data/dma_import.png}}
 875                                 \end{adjustbox}\\
 876 \\
 877 \\
 878                                 {\color{coolblack}Creating a texture using that external
 879                                 EGLImage:}\\
 880                                 \\
 881                                 \begin{adjustbox}{max width=\textwidth}
 882                                         \adjustbox{valign=t}{\includegraphics[height=2cm]{data/dma_targetteture2does.png}}
 883                                 \end{adjustbox}\\
 884                         \end{tabular}
 885                 \end{table}
 886                 }
 887         \end{block}
 888 \end{frame}
 889
 890 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 891 \begin{frame}
 892         \frametitle{Test program}
 893
 894         \begin{block}{\scriptsize{An exporter-importer that uses ANGLE and native
 895                 EGL}}
 896                 \setbeamertemplate{itemize/enumerate body begin}{\scriptsize}
 897                 \begin{itemize}
 898                         \itemsep0.3cm
 899                         \itemsep0.2cm
 900                         \item First context is EGL/OpenGL like the one in main graphics
 901                                 pipeline.
 902                         \item Second is ANGLE with EGL/GLESv2 backend like the one in
 903                                 WebGL2.
 904                         \item EGL/OpenGL context creates an empty texture and exports the dma\_buf
 905                                 fd and all other information about the buffer.
 906                         \item ANGLE context creates another empty texture using the same
 907                                 dma\_buf and the import mechanism.
 908                         \item ANGLE context fills the emty ANGLE texture.
 909                         \item EGL/OpenGL context displays the previously empty OpenGL/EGL
 910                                 texture.
 911                         \item EGL/OpenGL texture contains what ANGLE texture had.
 912                         \item \textbf{We shared the ANGLE data without copying them!}
 913                 \end{itemize}
 914
 915         \end{block}
 916         \vspace{0.2cm}
 917         \scriptsize{
 918                 \begin{center}
 919                         \textbf{\color{coolblack}Check the blog posts for more details!}
 920                 \end{center}
 921                 }
 922 \end{frame}
 923 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 924
 925 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 926 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 927 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 928 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 929 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 930
 931 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 932 \section[Multiple Processes]{Multiple Processes}
 933 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 934
 935 \begin{frame}[fragile,c]
 936     \frametitle{What if WebGL and Graphics pipeline were separate processes?}
 937         \setbeamertemplate{blocks}[rounded]
 938
 939 \vspace{0.3cm}
 940     \center{
 941         \textbf{\small{There is a plan to split the main graphics pipeline and the WebGL2
 942     pipeline in two processes. (Žan Doberšek)}}}
 943
 944 \vspace{0.5cm}
 945         \begin{block}{Can we still use shared DMA buffers?}
 946         \footnotesize{
 947
 948     \begin{itemize}
 949        \itemsep0.3cm
 950        \item {\color{coolblack} \textbf{YES!} DMA buffers can be shared across
 951               multiple processes.}
 952                   \item {\color{coolblack} But we need some sort of \textbf{\textit{interprocess
 953                           communication}} to exchange the file descriptor.}
 954                   \item {\color{coolblack} This is a client-server
 955                           \textbf{\textit{example}} that uses unix
 956             sockets to pass the dma-buf FD from one process to the other:
 957                         \url{https://gitlab.com/blaztinn/dma-buf-texture-sharing}.}
 958             \end{itemize}
 959
 960         }
 961     \end{block}
 962 \vspace{0.3cm}
 963 \end{frame}
 964
 965 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 966
 967 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 968 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 969 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 970 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 971 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 972
 973 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 974 \section[WebKit Integration]{WebKit Integration}
 975 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 976
 977 \begin{frame}[fragile,c]
 978     \frametitle{WIP WebKit:}
 979         \center{\normalsize{\textbf{\color{coolblack}{Ongoing work on WebKit}}}}
 980
 981         \vspace{0.1cm}
 982         \begin{center}
 983                 \setbeamertemplate{itemize/enumerate body begin}{\scriptsize}
 984                 \setbeamertemplate{itemize/enumerate subbody begin}[circle]{\tiny}
 985                         \begin{itemize}
 986                                 \itemsep0.2cm
 987                                 \item The extensions to import dma-buf buffers in ANGLE are
 988                                         implemented and exposed to the user => {\color{coolblack}in WebGL we can easily import the main pipeline
 989                                         DMA buf when we create the render target!}
 990                                 \item The extension to export dma-buf buffers from EGL is
 991                                         supported on mesa => {\color{coolblack}we could run a check before creating
 992                                         the shared dma buffer and use either use it or fallback to
 993                                         something else (libgbm? copying?)}
 994                         \end{itemize}
 995         \end{center}
 996         \vspace{0.05cm}
 997         {\scriptsize{
 998         \begin{block}{DONE/WIP/TODO}
 999             \begin{itemize}
1000                 \item{Use the right CMake options (one can't simply enable
1001                     \texttt{USE\_ANGLE\_WEBGL}!):
1002                     \color{coolblack}{\textbf{FIXED }}}
1003                 \item{There were compile errors when ANGLE was used:
1004                     \color{coolblack}{\textbf{FIXED/Pending to send the patches}}}
1005                 \item{Link errors when ANGLE is used:
1006                     \color{coolblack}{\textbf{WIP/Partially FIXED}}}
1007                 \item{Copy replacement: \color{coolblack}{\textbf{WIP/TODO}}}
1008             \end{itemize}
1009         \end{block}
1010         }}
1011
1012 \end{frame}
1013
1014 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1015
1016 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1017 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1018 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1019 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1020 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1021
1022 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1023 \section[References]{References}
1024 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1025 %\setbeamertemplate{bibliography entry title}{}
1026 %\setbeamertemplate{bibliography entry location}{}
1027 %\setbeamertemplate{bibliography entry note}{}
1028 \setbeamerfont{bibliography item}{size=\footnotesize}
1029 \setbeamerfont{bibliography entry author}{size=\footnotesize}
1030 \setbeamerfont{bibliography entry title}{size=\footnotesize}
1031 \setbeamerfont{bibliography entry year}{size=\footnotesize}
1032 \setbeamerfont{bibliography entry note}{size=\footnotesize}
1033
1034 \begin{frame}[allowframebreaks]
1035         \frametitle{Links}
1036         \bibliographystyle{unsrt}
1037         \bibliography{bib/references.bib}
1038         \nocite{*}
1039 \end{frame}
1040
1041 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1042 \end{document}
1043 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%