{"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\/sk\/blog\/news\/emulyator-risc-v-v-forme-pikselnogo-shejdera-pozvolivshij-zapustit-linux-v-vrchat","title":{"rendered":"Emul\u00e1tor RISC-V vo forme pixelov\u00e9ho shaderu, ktor\u00fd umo\u017enil spusti\u0165 Linux v VRChat","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Boli zverejnen\u00e9 v\u00fdsledky experimentu o organizovan\u00ed spustenia Linuxu v r\u00e1mci virtu\u00e1lneho 3D prostredia multiplayerovej online hry VRChat, ktor\u00e1 umo\u017e\u0148uje na\u010d\u00edtanie 3D modelov so svojimi shadermi. Na realiz\u00e1ciu zam\u00fd\u0161\u013eanej my\u0161lienky bol vytvoren\u00fd emul\u00e1tor architekt\u00fary RISC-V, vykon\u00e1van\u00fd na strane GPU vo forme pixelov\u00e9ho (fragmentov\u00e9ho) shaderu (VRChat nepodporuje v\u00fdpo\u010dtov\u00e9 shadery a UAV). K\u00f3d emul\u00e1tora bol zverejnen\u00fd pod licenciou MIT. <\/p>\n

Z\u00e1kladom emul\u00e1tora je implement\u00e1cia v jazyku C, pri jej vytv\u00e1ran\u00ed boli pou\u017eit\u00e9 v\u00fdstupy minimalistick\u00e9ho emul\u00e1tora riscv-rust, rozv\u00edjan\u00e9ho v jazyku Rust. Pripraven\u00fd C k\u00f3d je transponovan\u00fd do pixelov\u00e9ho shaderu v jazyku HLSL, vhodn\u00e9ho na na\u010d\u00edtanie do VRChat. Emul\u00e1tor poskytuje pln\u00fa podporu architekt\u00fary pr\u00edkazov\u00e9ho s\u00faboru rv32imasu, ovl\u00e1dacieho bloku pam\u00e4te SV32 a minim\u00e1lneho s\u00faboru perif\u00e9rnych zariaden\u00ed (UART a \u010dasova\u010d). Pripraven\u00e9 mo\u017enosti s\u00fa dostato\u010dn\u00e9 na na\u010d\u00edtanie jadra Linux 5.13.5 a z\u00e1kladn\u00e9ho prostredia pr\u00edkazov\u00e9ho riadku BusyBox, s ktor\u00fdm je mo\u017en\u00e9 interagova\u0165 priamo z virtu\u00e1lneho sveta VRChat.

\"Emul\u00e1tor<\/center>
\"Emul\u00e1tor<\/center> <\/p>\n

Emul\u00e1tor je implementovan\u00fd v shadere ako vlastn\u00e1 dynamick\u00e1 textura (Unity Custom Render Texture), doplnen\u00e1 o skripty Udon poskytovan\u00e9 pre VRChat, ktor\u00e9 s\u00fa pou\u017eit\u00e9 na riadenie emul\u00e1tora po\u010das jeho behu. Obsah opera\u010dnej pam\u00e4te a stav procesora emulovanej syst\u00e9mu s\u00fa ulo\u017een\u00e9 vo forme text\u00fary s rozmermi 2048×2048 pixelov. Emulovan\u00fd procesor pracuje frekvenciou 250 kHz. Okrem Linuxu m\u00f4\u017ee by\u0165 v emul\u00e1tore spusten\u00fd aj Micropython.

\"Emul\u00e1tor<\/center> <\/p>\n

Na zabezpe\u010denie trval\u00e9ho ukladania d\u00e1t s podporou \u010d\u00edtania a z\u00e1pisu sa pou\u017e\u00edva trik spojen\u00fd s pou\u017eit\u00edm objektu Camera, pripevnen\u00e9ho k obd\u013a\u017enikovej oblasti generovanej shaderom, a smerovan\u00edm v\u00fdstupu text\u00fary, ktor\u00e1 je vykreslen\u00e1, na vstup shaderu. T\u00fdmto sp\u00f4sobom m\u00f4\u017ee by\u0165 ka\u017ed\u00fd pixel, ktor\u00fd je zap\u00edsan\u00fd po\u010das vykon\u00e1vania pixelov\u00e9ho shaderu, pre\u010d\u00edtan\u00fd pri spracovan\u00ed nasleduj\u00faceho r\u00e1mca. <\/p>\n

Pri pou\u017eit\u00ed pixelov\u00fdch shader\u016f pro ka\u017ed\u00fd pixel textury se paraleln\u011b spou\u0161t\u00ed samostatn\u00fd p\u0159\u00edklad shaderu. Tato vlastnost zna\u010dn\u011b komplikuje realizaci a vy\u017eaduje samostatnou koordinaci stavu cel\u00e9ho emulovan\u00e9ho syst\u00e9mu a p\u0159i\u0159azen\u00ed pozice zpracov\u00e1van\u00e9ho pixelu ke k\u00f3dovan\u00e9mu stavu CPU nebo obsahu RAM emulovan\u00e9ho syst\u00e9mu (ka\u017ed\u00fd pixel m\u016f\u017ee k\u00f3dovat 128 bit\u016f informac\u00ed). K\u00f3d shaderu z\u00e1rove\u0148 vy\u017eaduje zahrnut\u00ed obrovsk\u00e9ho po\u010dtu kontrol, na jejich\u017e zjednodu\u0161en\u00ed byl nasazen perl-preprocesor perlpp.

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

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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\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\udd47Emul\u00e1tor RISC-V ve form\u011b 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