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

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 129 \setbeamertemplate{blocks}[default]
 130 \setbeamercolor{block title}{fg=amber,bg=black}
 131
 132 \title{\textbf{Sharing texture data between 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}
 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:}}}\scriptsize{\texttt{
 323                 \begin{itemize}
 324                         \itemsep0.1cm
 325                                 \color{coolblack}
 326                         \item {{Default \textbf{gn} configuration redirects debugging
 327                                 symbols into separate files where GDB can't find them.}}
 328                         \item {\textbf{GDB} doesn't know where to find the ANGLE
 329                                 installation directories.}
 330                         \item {{\textbf{dwarf5} is not fully implemented on GDB, and so it's
 331                                 impossible to step without errors when it's enabled.}}
 332                         \item {\textbf{Debugging symbols} aren't enabled by default.}
 333                 \end{itemize}}}
 334         \vspace{0.2cm}
 335         \end{block}
 336
 337         \vspace{0.3cm}
 338
 339         \scriptsize{
 340                 \setbeamertemplate{itemize item}[circle]
 341         \begin{itemize}
 342                 \item {\textbf{Blog post} on how to set up
 343                         \textbf{\color{mediumred-violet}{ANGLE}} and \textbf{\color{mediumred-violet}{GDB}} for debugging: \url{https://eleni.mutantstargoat.com/hikiko/debug-angle/}}
 344                 \item {\textbf{Gist} with the \textbf{\color{mediumred-violet}{GN args}}
 345                         I've used: \url{https://gistof.com/gnargs}}
 346         \end{itemize}}
 347         \vspace{0.2cm}
 348 \end{frame}
 349
 350 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 351
 352 \begin{frame}[fragile,c]
 353     \frametitle{Step 2: Contexts from two drivers in the same
 354     program 1/2}
 355
 356         \setbeamertemplate{itemize/enumerate body begin}{\scriptsize}
 357         \setbeamertemplate{itemize/enumerate subbody begin}{\tiny}
 358         \setbeamertemplate{itemize/enumerate subsubbody begin}{\tiny}
 359         \setbeamertemplate{itemize items}[triangle]
 360         \setbeamertemplate{blocks}[rounded]
 361
 362         \begin{center}
 363         \textbf{\color{coolblack}First Test}
 364         \end{center}
 365         \vspace{-0.1cm}
 366         \scriptsize{\color{coolblack}
 367         I've first written a program where both ANGLE and native system driver render
 368         images on two different X11 windows and displayed them side by side:
 369         }
 370         \vspace{-0.1cm}
 371         \begin{center}
 372         \adjustbox{valign=t, margin=1ex,
 373         padding=1ex}{\includegraphics[height=1.5cm]{data/angle_egl.png}}
 374         \end{center}
 375         \vspace{-0.1cm}
 376         \begin{block}{\footnotesize{Things I had to take care of:}}
 377         \begin{itemize}
 378                 \item {Set ANGLE \textbf{library paths} in Makefile and link
 379                         with native system EGL.}
 380                 \item {\textbf{Dynamically open} ANGLE EGL and load its functions prefixed with
 381                         \texttt{angle\_} to distinguish them from native EGL ones.}
 382                 \item {Do the same for GLESv2.}
 383                 \item {\textbf{Invalidate the ANGLE context} at every display call.\\
 384                         (\textit{When ANGLE is not the only
 385                         implementation available \texttt{MakeCurrent} is not working as
 386                         expected!!!})}
 387         \end{itemize}
 388         \end{block}
 389 \end{frame}
 390
 391 \begin{frame}[fragile,c]
 392     \frametitle{Step 2: Contexts from two drivers in the same
 393     program 2/2}
 394         \vspace{0.1cm}
 395         \begin{center}
 396                 \textbf{\color{coolblack}Why invalidate the ANGLE context before MakeCurrent?}
 397                 \\
 398                 \begin{table}[c]
 399                         \begin{tabularx}{\textwidth}{l X}
 400                                 \tiny{\textbf{\color{mediumred-violet}Context is cached in ANGLE!}} &
 401                                 \adjustbox{valign=c, margin=0.1ex,
 402                                 padding=0.1ex}{\includegraphics[height=2cm]{data/makecurrent.png}} \\
 403                         \end{tabularx}
 404                 \end{table}
 405         \end{center}
 406
 407         \vspace{-0.1cm}
 408         \begin{center}
 409                 \textbf{\color{coolblack}More on Makefile changes and dynamic loading:}
 410         \end{center}
 411
 412         \setbeamertemplate{itemize/enumerate body begin}{\tiny}
 413         \setbeamertemplate{itemize items}[circle]
 414
 415         \tiny{
 416         \textbf{\texttt{\color{black}{Blog post:}}}
 417         {Sharing texture data between ANGLE and the native system driver:\\
 418         \url{https://eleni.mutantstargoat.com/hikiko/angle-dma/}}\\
 419         \vspace{0.1cm}
 420         \begin{itemize}
 421             \itemsep0.1cm
 422             \item
 423                 {\color{black}Step 1: Using
 424                 both libraries in the same program.}
 425             \item
 426                 {\color{black}{About ANGLE MakeCurrent.}}
 427         \end{itemize}
 428
 429         \vspace{0.3cm}
 430
 431         \color{black}{\textbf{\texttt{Code:}}}
 432         {\url{https://github.com/hikiko/shctx/tree/wip/system\_egl\_dynamic\_angle}}
 433
 434         }
 435 \end{frame}
 436
 437 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 438
 439 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 440 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 441 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 442 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 443 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 444
 445 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 446 \section[Experiment 2]{Experiment 2: Sharing a texture across drivers using shared context}
 447 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 448
 449 \begin{frame}[fragile,c]
 450     \frametitle{Shared Context}
 451     \begin{center}
 452         \scriptsize{
 453             \textbf{\color{coolblack}{A texture can be accessed by multiple OpenGL or
 454             GLESv2 contexts when these contexts are \textit{shared}:}}
 455         }
 456         \vspace{0.001cm}
 457         \texttt{
 458             \begin{table}[h]
 459                 \centering
 460                 \begin{adjustbox}{max width=\textwidth}
 461                     \begin{tabular}{|l|}
 462                         \hline
 463                         \rowcolor{platinum}
 464                         \\
 465                         \rowcolor{platinum}
 466                         \textbf{new\_ctx} = {\color{mediumred-violet}eglCreateContext}(new\_ctx\_dpy, new\_ctx\_config,
 467                         \textbf{native\_ctx}, new\_ctx\_attrib);\\
 468                         \rowcolor{platinum}\\
 469                         \hline
 470                     \end{tabular}
 471                 \end{adjustbox}
 472             \end{table}
 473         }
 474
 475         \vspace{0.1cm}
 476         \scriptsize{
 477             \textbf{\color{coolblack}{A texture generated by each context can be bound and used by the
 478             other\\ without ever leaving the GPU!}}
 479         }
 480         \vspace{0.01cm}
 481
 482         \tiny{
 483             \texttt{
 484                 \begin{table}[h]
 485                     \centering
 486                     \begin{adjustbox}{max width=\textwidth}
 487                         \begin{tabular}{|l|}
 488                             \rowcolor{platinum}
 489                             \hline
 490                             \rowcolor{platinum}
 491                             \\
 492                             \rowcolor{platinum}
 493                         glBindTexture({\color{mediumred-violet}GL\_TEXTURE\_2D}, \textbf{\color{afblue}gl\_shared\_tex});\\
 494                             \rowcolor{platinum}
 495                         {\color{darkgray}/* ... gl operations ... */}\\
 496                             \rowcolor{platinum}
 497                         \\
 498                             \rowcolor{platinum}
 499                         angle\_glBindTexture({\color{mediumred-violet}GL\_TEXTURE\_2D}, \textbf{\color{afblue}gl\_shared\_tex});\\
 500                             \rowcolor{platinum}
 501                         {\color{darkgray}/* ... angle\_gl operations ... */}\\
 502                             \rowcolor{platinum}
 503                         \\\hline
 504                     \end{tabular}
 505                     \end{adjustbox}
 506                 \end{table}
 507             }}
 508
 509     \vspace{0.2cm}
 510         \setbeamertemplate{itemize/enumerate body begin}{\tiny}
 511         \setbeamertemplate{itemize items}[triangle]
 512
 513         %\setbeamertemplate{blocks}
 514         \scriptsize{  \textbf{\color{coolblack}{Shared context restrictions:}}}
 515         \vspace{0.1cm}
 516         \begin{itemize}
 517             \item Contexts must be created by the \textbf{same API} (both OpenGL,
 518                 or both GLESv2, same driver).
 519             \item Contexts must be created by the \textbf{same
 520                 process}.(\textbf{=>
 521                 {\color{coolblack}{not
 522                 suitable for every project!}}})
 523         \end{itemize}
 524     \end{center}
 525 \end{frame}
 526
 527 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 528
 529 \begin{frame}[fragile,c]
 530     \frametitle{Could we use shared context in WebKit?}
 531
 532         \setbeamertemplate{itemize/enumerate body begin}{\tiny}
 533         \setbeamertemplate{itemize items}[triangle]
 534     \begin{center}
 535         \scriptsize{
 536             \textbf{\color{coolblack} Could we use shared context in WebKit?}\\
 537
 538             \vspace{0.2cm}
 539
 540             \textbf{Short answer:} Currently yes (with some workaround) but not in the
 541             future.
 542
 543             \vspace{0.3cm}
 544
 545             \begin{block}{Requirements to use shared context/textures in \textbf{WebKit}:}
 546                 \begin{itemize}
 547                     \item We should use the \textbf{ANGLE EGL/OpenGL backend in
 548                         WebGL2} to
 549                         match the main Graphics Pipeline API/driver (both contexts
 550                         should be OpenGL or GLESv2 and from the same driver!)
 551                     \item We'd need an \textbf{ANGLE extension} to allow passing
 552                         native shared context to ANGLE's eglCreateContext instead of
 553                         ANGLE shared context.
 554                     \item We should never move WebGL2 and Graphics Pipeline in
 555                         different processes. Shared contexts should be created by
 556                         the same process! (\textbf{Reason we've rejected this
 557                         method}).
 558                 \end{itemize}
 559             \end{block}
 560         }
 561
 562         \vspace{0.3cm}
 563
 564         \tiny{
 565             \textbf{\color{coolblack}{NEW}} ANGLE extension:\\
 566             \texttt{EGL\_ANGLE\_native\_shared\_context}
 567
 568             \vspace{0.2cm}
 569
 570
 571             \textbf{\color{coolblack}NEW} \texttt{\color{afblue}EGLAttrib} attribute can be passed
 572             to \texttt{\color{afblue}eglCreateContext}:\\
 573             \texttt{EGL\_NATIVE\_SHARED\_CONTEXT\_ANGLE}
 574
 575             \vspace{0.3cm}
 576             {\color{coolblack}
 577             This attribute indicates that the shared context in
 578             \texttt{\color{deepjunglegreen}eglCreateContext}
 579             is \textbf{not ANGLE} and should be used as native in the internal
 580             implementation.
 581             }
 582         }
 583     \end{center}
 584 \end{frame}
 585
 586 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 587 \begin{frame}[fragile,c]
 588     \frametitle{EGL\_ANGLE\_native\_shared\_context}
 589
 590         \setbeamertemplate{itemize/enumerate body begin}{\tiny}
 591     \setbeamertemplate{itemize items}[triangle]{\tiny}
 592     \setbeamercolor{block body}{bg=white}
 593
 594     \begin{center}
 595         \tiny{
 596             \begin{block}{This is how we create shared OpenGL
 597                 context using EGL (system or ANGLE):}
 598                 \centering
 599                 \begin{adjustbox}{max width=\textwidth}
 600                     \adjustbox{valign=t}{\includegraphics[height=1.3cm]{data/shared_ctx1.png}}
 601                 \end{adjustbox}
 602
 603                 \begin{comment}
 604                 {\color{coolblack}
 605                 \begin{table}[t]
 606                     \centering
 607                     \begin{adjustbox}{max width=\textwidth}
 608                         \begin{tabular}{l}
 609                             · In case of system EGL \texttt{ctx\_A} and
 610                             \texttt{ctx\_B} are native
 611                             EGL contexts.\\
 612                             · In case of ANGLE they are ANGLE EGL contexts.\\
 613                         \end{tabular}
 614                     \end{adjustbox}
 615                 \end{table}
 616                 }
 617                 \end{comment}
 618             \end{block}
 619         }
 620
 621         \tiny{
 622         \begin{block}{This is how we'd create shared
 623         OpenGL context between native EGL and ANGLE EGL using
 624             \texttt{EGL\_ANGLE\_native\_shared\_context}:}
 625
 626             \vspace{0.2cm}
 627             \begin{itemize}
 628                 \item \tiny{We'd pass the native EGL context (created by the native system
 629                     driver) as {\color{black}shared context} to the
 630                     native OpenGL context that is created {\color{black}in the ANGLE
 631                     OpenGL backend} using the native system driver!}
 632                 \item \tiny{We'd need use the {\color{black}new EGL attribute
 633                     (\texttt{EGL\_NATIVE\_SHARED\_CONTEXT\_ANGLE})} to let ANGLE know
 634                     that the shared context \textit{\color{coolblack}is not ANGLE but native}
 635                     context!}
 636             \end{itemize}
 637             \vspace{-0.2cm}
 638
 639         \begin{table}[t]
 640             \centering
 641             \begin{tabular}{l}
 642                 \begin{adjustbox}{max width=\textwidth}
 643                     \adjustbox{valign=t}{\includegraphics[height=3.5cm]{data/shared_ctx2.png}}
 644                 \end{adjustbox}
 645             \end{tabular}
 646         \end{table}
 647         \end{block}
 648     }
 649
 650
 651     \end{center}
 652 \end{frame}
 653
 654 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 655 \begin{frame}[fragile,c]
 656     \frametitle{Some work on the shared context approach}
 657         \setbeamertemplate{itemize/enumerate body begin}{\tiny}
 658     \setbeamertemplate{itemize items}[triangle]{\tiny}
 659     \setbeamercolor{block body}{bg=white}
 660
 661     \begin{center}
 662         \begin{block}{\tiny{Extension
 663             \texttt{EGL\_NATIVE\_SHARED\_CONTEXT\_ANGLE}:}}
 664             \vspace{0.2cm}
 665             \tiny{
 666                 \begin{table}[h]
 667                     \centering
 668                         Worked on the extension implementation (draft state, there are
 669                         bugs).\\
 670                     \begin{tabular}{l}
 671                         \\
 672                         \textbf{Concept:}\\
 673                         \begin{adjustbox}{max width=\textwidth}
 674                             \adjustbox{valign=t}{\includegraphics[scale=0.2]{data/shared_ctx3.png}}
 675                         \end{adjustbox}\\
 676                     \end{tabular}
 677                 \end{table}
 678             }
 679         \end{block}
 680         \begin{block}{\tiny{Experimental programs (to test the extension and
 681             familiarize with the shared context concept):}}
 682             \begin{itemize}
 683                 \item A test program that uses EGL ctxA to create a texture and
 684                     EGL ctxB to display it on an X11 window.
 685                 \item The same program written in ANGLE (there were
 686                     differences!)
 687                 \item A test program that uses EGL ctxA to create a texture and
 688                     ANGLE EGL ctxB to display it on an X11 window.
 689                 \item Variations of the above:
 690                     \url{https://github.com/hikiko/shctx/branches}
 691             \end{itemize}
 692         \end{block}
 693     \end{center}
 694    \end{frame}
 695
 696 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 697    \begin{frame}
 698        \frametitle{Abandoned!}
 699        \begin{center}
 700            \textbf{\color{coolblack} Why not shared context?}
 701            \vspace{0.5cm}
 702
 703            {\footnotesize{
 704                \begin{itemize}
 705                    \item Shared context would be a nice and clean approach if we wanted to use
 706                        it with our current WebKit code.
 707                    \item But there is a plan to use \textbf{separate processes} for WebGL2 and
 708                                            the main graphics pipeline!! (Žan Doberšek)
 709                \end{itemize}
 710            }}
 711
 712            \vspace{0.5cm}
 713            \textbf{\color{coolblack} But there was a \textit{better} approach!}
 714        \end{center}
 715    \end{frame}
 716 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 717
 718 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 719 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 720 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 721 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 722
 723 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 724 \section[Experiment 3]{Experiment 3: Sharing texture data across drivers using kernel DMA buffers}
 725 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 726
 727 \begin{frame}
 728     \frametitle{DMA buffers for the win!}
 729
 730     \begin{center}
 731                 \textbf{\color{coolblack}Fortunately we are on Linux!}
 732
 733                 \setbeamercolor{block body}{bg=white}
 734                 \setbeamercolor{block title}{bg=white, fg=coolblack}
 735                 \begin{block}{\scriptsize{There is a Linux kernel framework that can be used for
 736                         content sharing between different Linux drivers!}}
 737
 738                         \vspace{-0.1cm}
 739                         \begin{table}[t]
 740                                 \centering
 741                                 \begin{tabular}{l}
 742                                         \begin{adjustbox}{max width=\textwidth}
 743                                                 \adjustbox{valign=t}{\includegraphics[height=3.1cm]{data/dma_buf_sharing.png}}
 744                                         \end{adjustbox}
 745                                 \end{tabular}
 746                         \end{table}
 747
 748                         \textbf{\scriptsize{\color{coolblack}A few things that need our attention:}}\\
 749                         \vspace{0.1cm}
 750
 751                         \setbeamertemplate{itemize/enumerate body begin}{\tiny}
 752                         \begin{itemize}
 753                                 \item There are {\color{coolblack}EGL and OpenGL/GLESv2
 754                                         extensions} to make this content sharing easier!
 755                                 \item It's {\color{coolblack}driver independent}!
 756                                 \item It works with {\color{coolblack}multiple processes}!
 757                                 \item As long as ANGLE can expose the required extensions to
 758                                         import a dma\_buf file descriptor this method is
 759                                         {\color{coolblack}"ANGLE backend
 760                                         independent"}!
 761                                 \item Works {\color{coolblack}only on Linux}... but in case of
 762                                         WPE we won't need to support other systems! (Žan Doberšek)
 763                         \end{itemize}
 764                 \end{block}
 765     \end{center}
 766 \end{frame}
 767
 768 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 769
 770 \begin{frame}
 771         \frametitle{Extensions and new approach}
 772
 773         \setbeamercolor{block body}{bg=white}
 774         \setbeamertemplate{itemize/enumerate body begin}{\tiny}
 775
 776         \begin{block}{\scriptsize{How the kernel DMA buffers would help us avoid copying
 777                 the WebGL texture data?}}
 778
 779                 \begin{center}
 780                         \begin{itemize}
 781                                 \item Each texture is backed by a Linux kernel dma\_buffer.
 782                                 \item Multiple textures can use the same dma buffer as backing
 783                                         storage if they meet some requirements.
 784                                 \item We can export the file descriptor of one buffer from one
 785                                         driver and use it to access the buffer from the other
 786                                         driver.
 787                                 \item So we can export the FD that corresponds to the compositor
 788                                         texture, import it in WebGL when we create the render target
 789                                         and when the WebGL texture is filled, the compositor texture
 790                                         will be also filled, as they share the backing storage!
 791                         \end{itemize}
 792                 \end{center}
 793         \end{block}
 794         \begin{block}{\scriptsize{EGL and GL extensions that can be used:}}
 795                 \begin{center}
 796                         \begin{itemize}
 797                                 \item
 798                                         \href{https://www.khronos.org/registry/EGL/extensions/MESA/EGL\_MESA\_image\_dma\_buf\_export.txt}{EGL\_MESA\_image\_dma\_buf\_export}:
 799                                         \\ This extension allows creating one or multiple Linux dma\_buf
 800                                         file descriptors from the EGLImage that corresponds to a texture.
 801                                 \item \href{https://www.khronos.org/registry/EGL/extensions/EXT/EGL\_EXT\_image\_dma\_buf\_import.txt}{EGL\_EXT\_image\_dma\_buf\_import}:
 802                                         \\ This extension allows creating an EGLImage (that will be used to create a
 803                                         texture) from one or multiple Linux dma\_buf file
 804                                         descriptors.
 805                                 \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}:
 806                                         \\ This extension builds on EGL\_EXT\_image\_dma\_buf\_import, in order to support
 807                                         format modifiers used for tiling, compression, and additional non-linear
 808                                         modes.
 809                                 \item \href{https://www.khronos.org/registry/OpenGL/extensions/OES/OES\_EGL\_image\_external.txt}{OES\_EGL\_image\_external}:
 810                                         \\ This extension provides a mechanism for creating EGLImage texture targets
 811                                         from EGLImages.
 812                         \end{itemize}
 813                 \end{center}
 814         \end{block}
 815 \end{frame}
 816
 817 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 818
 819 \begin{frame}
 820         \frametitle{Example:}
 821
 822         \setbeamercolor{block body}{bg=white}{\scriptsize}
 823         \setbeamertemplate{itemize/enumerate body begin}{\tiny}
 824
 825         \begin{block}{\scriptsize{I've written an example:}}
 826                 \begin{center}
 827                         \begin{itemize}
 828                                 \item First using EGL!\\
 829                                         Blog post: \url{https://eleni.mutantstargoat.com/hikiko/egl-dma-1/} \\
 830                                         Code: \url{https://gistof.com/dma-egl-version}
 831                                 \item Then using a native EGL context and a context from ANGLE!\\
 832                                         Blog post: \url{https://eleni.mutantstargoat.com/hikiko/angle-dma/}\\
 833                                         Code: \url{https://gistof.com/dmaangleeglversion}
 834                         \end{itemize}
 835                 \end{center}
 836         \end{block}
 837         \vspace{-0.3cm}
 838         \begin{block}{\scriptsize{Snippet from the exporter:}}
 839                 \vspace{-0.1cm}
 840                 \tiny{
 841                 \begin{table}[t]
 842                         \centering
 843                         \begin{tabular}{l}
 844                                 {\color{coolblack}Exporting a dma buffer from a texture
 845                                 \texttt{texA}:}\\
 846                                 \begin{adjustbox}{max width=\textwidth}
 847                                         \adjustbox{valign=t}{\includegraphics[height=4cm]{data/dma_export_and_struct.png}}
 848                                 \end{adjustbox}\\
 849                         \end{tabular}
 850                 \end{table}
 851                 }
 852         \end{block}
 853 \end{frame}
 854
 855 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 856
 857 \begin{frame}
 858         \frametitle{Example continued}
 859         \setbeamercolor{block body}{bg=white}{\scriptsize}
 860         \setbeamertemplate{itemize/enumerate body begin}{\tiny}
 861
 862         \begin{block}{\scriptsize{Snippets from the importer:}}
 863                 \vspace{-0.1cm}
 864                 \tiny{
 865                 \begin{table}[t]
 866                         \centering
 867                         \begin{tabular}{l}
 868                                 {\color{coolblack}Creating an EGLImage from the dma buffer using
 869                                 the exported fd and the exported modifiers:}\\
 870                                 \\
 871                                 \begin{adjustbox}{max width=\textwidth}
 872                                         \adjustbox{valign=t}{\includegraphics[height=3.5cm]{data/dma_import.png}}
 873                                 \end{adjustbox}\\
 874 \\
 875 \\
 876                                 {\color{coolblack}Creating a texture using that external
 877                                 EGLImage:}\\
 878                                 \\
 879                                 \begin{adjustbox}{max width=\textwidth}
 880                                         \adjustbox{valign=t}{\includegraphics[height=2cm]{data/dma_targetteture2does.png}}
 881                                 \end{adjustbox}\\
 882                         \end{tabular}
 883                 \end{table}
 884                 }
 885         \end{block}
 886 \end{frame}
 887
 888 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 889
 890 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 891 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 892 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 893 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 894 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 895
 896 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 897 \section[Multiple Processes]{Multiple Processes}
 898 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 899
 900 \begin{frame}[fragile,c]
 901     \frametitle{What if WebGL and Graphics pipeline were separate processes?}
 902         \setbeamertemplate{blocks}[rounded]
 903
 904 \vspace{0.3cm}
 905     \center{
 906         \textbf{\small{There is a plan to split the main graphics pipeline and the WebGL2
 907     pipeline in two processes. (Žan Doberšek)}}}
 908
 909 \vspace{0.5cm}
 910         \begin{block}{Can we still use shared DMA buffers?}
 911         \footnotesize{
 912
 913     \begin{itemize}
 914        \itemsep0.3cm
 915        \item {\color{coolblack} \textbf{YES!} DMA buffers can be shared across
 916               multiple processes.}
 917                   \item {\color{coolblack} But we need some sort of \textbf{\textit{interprocess
 918                           communication}} to exchange the file descriptor.}
 919                   \item {\color{coolblack} This is a client-server
 920                           \textbf{\textit{example}} that uses unix
 921             sockets to pass the dma-buf FD from one process to the other:
 922                         \url{https://gitlab.com/blaztinn/dma-buf-texture-sharing}.}
 923             \end{itemize}
 924
 925         }
 926     \end{block}
 927
 928 \vspace{0.3cm}
 929 \end{frame}
 930
 931 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 932
 933 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 934 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 935 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 936 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 937 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 938
 939 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 940 \section[WebKit Integration]{WebKit Integration}
 941 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 942
 943 \begin{frame}[fragile,c]
 944     \frametitle{WIP WebKit:}
 945         \center{\normalsize{\textbf{\color{coolblack}{Ongoing work on WebKit}}}}
 946
 947         \vspace{0.3cm}
 948
 949         {\footnotesize{
 950         \begin{block}{DONE/WIP/TODO}
 951             \begin{itemize}
 952                 \item{Use the right CMake options (one can't simply enable
 953                     \texttt{USE\_ANGLE\_WEBGL} ☺):
 954                     \color{coolblack}{\textbf{FIXED }}}
 955                 \item{There were compile errors when ANGLE was used:
 956                     \color{coolblack}{\textbf{FIXED/Pending to send the patches}}}
 957                 \item{Link errors when ANGLE is used:
 958                     \color{coolblack}{\textbf{WIP/Partially FIXED}}}
 959                 \item{Copy replacement: \color{coolblack}{\textbf{WIP/TODO}}}
 960             \end{itemize}
 961         \end{block}
 962         }}
 963
 964         \vspace{0.2cm}
 965         \begin{center}
 966                 \setbeamertemplate{itemize/enumerate body begin}{\scriptsize}
 967                 \setbeamertemplate{itemize/enumerate subbody begin}[circle]{\tiny}
 968                         \begin{itemize}
 969                                 \itemsep0.2cm
 970                                 \item The extensions to import dma-buf buffers in ANGLE are
 971                                         implemented and exposed to the user => {\color{coolblack}in WebGL we can easily import the main pipeline
 972                                         DMA buf when we create the render target!}
 973                                 \item The extension to export dma-buf buffers from EGL is
 974                                         supported on mesa => {\color{coolblack}we could run a check before creating
 975                                         the shared dma buffer and use either use it or fallback to
 976                                         something else (libgbm? copying?)}
 977                         \end{itemize}
 978         \end{center}
 979 \end{frame}
 980
 981 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 982
 983 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 984 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 985 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 986 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 987 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 988
 989 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 990 \section[References]{References}
 991 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 992 %\setbeamertemplate{bibliography entry title}{}
 993 %\setbeamertemplate{bibliography entry location}{}
 994 %\setbeamertemplate{bibliography entry note}{}
 995 \setbeamerfont{bibliography item}{size=\footnotesize}
 996 \setbeamerfont{bibliography entry author}{size=\footnotesize}
 997 \setbeamerfont{bibliography entry title}{size=\footnotesize}
 998 \setbeamerfont{bibliography entry year}{size=\footnotesize}
 999 \setbeamerfont{bibliography entry note}{size=\footnotesize}
1000
1001 \begin{frame}[allowframebreaks]
1002         \frametitle{Links}
1003         \bibliographystyle{unsrt}
1004         \bibliography{bib/references.bib}
1005         \nocite{*}
1006 \end{frame}
1007
1008 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1009 \end{document}
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