{"id":101103,"date":"2021-08-27T10:23:05","date_gmt":"2021-08-27T08:23:07","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/emulyator-risc-v-v-forme-pikselnogo-shejdera-pozvolivshij-zapustit-linux-v-vrchat"},"modified":"2021-08-27T10:23:05","modified_gmt":"2021-08-27T08:23:07","slug":"emulyator-risc-v-v-forme-pikselnogo-shejdera-pozvolivshij-zapustit-linux-v-vrchat","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pl\/blog\/news\/emulyator-risc-v-v-forme-pikselnogo-shejdera-pozvolivshij-zapustit-linux-v-vrchat","title":{"rendered":"Emulator RISC-V w formie cienia pikselowego, kt\u00f3ry umo\u017cliwi\u0142 uruchomienie Linuxa w VRChat","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Opublikowano wyniki eksperymentu dotycz\u0105cego uruchamiania systemu Linux w wirtualnej przestrzeni 3D wieloosobowej gry online VRChat, kt\u00f3ra pozwala na \u0142adowanie modeli 3D z w\u0142asnymi shaderami. W celu zrealizowania zamys\u0142u stworzono emulator architektury RISC-V, dzia\u0142aj\u0105cy po stronie GPU jako shader pikselowy (fragmentowy) (VRChat nie obs\u0142uguje shader\u00f3w obliczeniowych i UAV). Kod emulatora zosta\u0142 opublikowany na licencji MIT. <\/p>\n

Emulator oparty jest na implementacji w j\u0119zyku C, przy tworzeniu kt\u00f3rej wykorzystano osi\u0105gni\u0119cia minimalistycznego emulatora riscv-rust, rozwijanego w j\u0119zyku Rust. Przygotowany kod w C jest t\u0142umaczony na shader pikselowy w j\u0119zyku HLSL, odpowiedni do za\u0142adowania w VRChat. Emulator zapewnia pe\u0142ne wsparcie dla architektury zestawu instrukcji rv32imasu, bloku zarz\u0105dzania pami\u0119ci\u0105 SV32 oraz minimalnego zestawu urz\u0105dze\u0144 peryferyjnych (UART i timer). Przygotowane mo\u017cliwo\u015bci s\u0105 wystarczaj\u0105ce do za\u0142adowania j\u0105dra Linux 5.13.5 oraz podstawowego \u015brodowiska wiersza polece\u0144 BusyBox, z kt\u00f3rym mo\u017cna bezpo\u015brednio wsp\u00f3\u0142dzia\u0142a\u0107 z wirtualnego \u015bwiata VRChat.

\"Emulator<\/center>
\"Emulator<\/center> <\/p>\n

Emulator jest realizowany w shaderze w formie w\u0142asnej dynamicznej tekstury (Unity Custom Render Texture), wzbogaconej o skrypty Udon, kt\u00f3re s\u0105 wykorzystywane do zarz\u0105dzania emulatorem podczas jego dzia\u0142ania. Zawarto\u015b\u0107 pami\u0119ci operacyjnej i stan procesora emulowanego systemu s\u0105 przechowywane w formie tekstury o rozmiarze 2048\u00d72048 pikseli. Emulowany procesor dzia\u0142a z cz\u0119stotliwo\u015bci\u0105 250 kHz. Opr\u00f3cz Linux w emulatorze mo\u017cna r\u00f3wnie\u017c uruchomi\u0107 Micropython.

\"Emulator<\/center> <\/p>\n

Do organizacji sta\u0142ego przechowywania danych z obs\u0142ug\u0105 odczytu i zapisu u\u017cywa si\u0119 sztuczki zwi\u0105zanej z wykorzystaniem obiektu Camera, przypisanego do prostok\u0105tnego obszaru generowanego przez shader, oraz kierunku wyj\u015bcia renderowanej tekstury do wej\u015bcia shadera. W ten spos\u00f3b ka\u017cdy piksel zapisany podczas dzia\u0142ania shadera pikselowego mo\u017ce by\u0107 odczytany podczas przetwarzania nast\u0119pnej klatki. <\/p>\n

Podczas stosowania shader\u00f3w pikselowych dla ka\u017cdego piksela tekstury r\u00f3wnolegle uruchamiany jest osobny egzemplarz shadera. Ta cecha znacznie komplikuje realizacj\u0119 i wymaga osobnej koordynacji stanu ca\u0142ego emulowanego systemu oraz dopasowania pozycji przetwarzanego piksela do zakodowanych w nim stan\u00f3w CPU lub zawarto\u015bci RAM emulowanego systemu (ka\u017cdy piksel mo\u017ce kodowa\u0107 128 bit\u00f3w informacji). Kod shadera wymaga w\u0142\u0105czenia ogromnej liczby kontroli, do uproszczenia realizacji kt\u00f3rej zastosowano preprocesor perlpp.

\r\n \"Odtwarzaj\r\n
<\/div>\r\n <\/div><\/center>
\n
\u0179r\u00f3d\u0142o: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d\u044b \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442\u044b \u044d\u043a\u0441\u043f\u0435\u0440\u0438\u043c\u0435\u043d\u0442\u0430 \u043f\u043e \u043e\u0440\u0433\u0430\u043d\u0438\u0437\u0430\u0446\u0438\u0438 \u0437\u0430\u043f\u0443\u0441\u043a\u0430 Linux \u0432\u043d\u0443\u0442\u0440\u0438 \u0432\u0438\u0440\u0442\u0443\u0430\u043b\u044c\u043d\u043e\u0433\u043e 3D-\u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u0441\u0442\u0432\u0430 \u043c\u043d\u043e\u0433\u043e\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044c\u0441\u043a\u043e\u0439 online-\u0438\u0433\u0440\u044b VRChat, \u0434\u043e\u043f\u0443\u0441\u043a\u0430\u044e\u0449\u0435\u0439 \u0437\u0430\u0433\u0440\u0443\u0437\u043a\u0443 3D-\u043c\u043e\u0434\u0435\u043b\u0435\u0439 \u0441\u043e \u0441\u0432\u043e\u0438\u043c\u0438 \u0448\u0435\u0439\u0434\u0435\u0440\u0430\u043c\u0438. \u0414\u043b\u044f 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\u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d \u043f\u043e\u0434 \u043b\u0438\u0446\u0435\u043d\u0437\u0438\u0435\u0439 MIT. \u0412 \u043e\u0441\u043d\u043e\u0432\u0435 \u044d\u043c\u0443\u043b\u044f\u0442\u043e\u0440\u0430 \u0437\u0430\u043b\u043e\u0436\u0435\u043d\u0430 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u044f […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":101104,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-101103","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47Emulator RISC-V w formie shadera pikselowego, 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