{"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\/cs\/blog\/news\/emulyator-risc-v-v-forme-pikselnogo-shejdera-pozvolivshij-zapustit-linux-v-vrchat","title":{"rendered":"Emul\u00e1tor RISC-V ve form\u011b pixelov\u00e9ho shaderu, kter\u00fd umo\u017enil spustit Linux ve VRChat","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Byly publikov\u00e1ny v\u00fdsledky experimentu zam\u011b\u0159en\u00e9ho na spu\u0161t\u011bn\u00ed Linuxu v r\u00e1mci virtu\u00e1ln\u00edho 3D prost\u0159ed\u00ed multihr\u00e1\u010dsk\u00e9 online hry VRChat, kter\u00e1 podporuje nahr\u00e1v\u00e1n\u00ed 3D model\u016f se sv\u00fdmi shadery. Pro realizaci tohoto konceptu byl vytvo\u0159en emul\u00e1tor architektury RISC-V, kter\u00fd b\u011b\u017e\u00ed na GPU ve form\u011b pixelov\u00e9ho (fragmentov\u00e9ho) shaderu (VRChat nepodporuje v\u00fdpo\u010detn\u00ed shadery a UAV). K\u00f3d emul\u00e1toru byl publikov\u00e1n pod licenc\u00ed MIT. <\/p>\n

Emul\u00e1tor vych\u00e1z\u00ed z implementace v jazyce C, kter\u00e1 byla vytvo\u0159ena na z\u00e1klad\u011b minimalistick\u00e9ho emul\u00e1toru riscv-rust, vyv\u00edjen\u00e9ho v jazyce Rust. P\u0159ipraven\u00fd C k\u00f3d je p\u0159elo\u017een do pixelov\u00e9ho shaderu v jazyce HLSL, kter\u00fd je vhodn\u00fd pro nahr\u00e1n\u00ed do VRChat. Emul\u00e1tor poskytuje plnou podporu architektury p\u0159\u00edkazov\u00e9ho setu rv32imasu, pam\u011b\u0165ov\u00e9ho \u0159adi\u010de SV32 a minim\u00e1ln\u00edho po\u010dtu perifern\u00edch za\u0159\u00edzen\u00ed (UART a \u010dasova\u010d). P\u0159ipraven\u00e9 funkce jsou dostate\u010dn\u00e9 pro nahr\u00e1n\u00ed j\u00e1dra Linux 5.13.5 a z\u00e1kladn\u00edho prost\u0159ed\u00ed p\u0159\u00edkazov\u00e9ho \u0159\u00e1dku BusyBox, se kter\u00fdm je mo\u017en\u00e9 p\u0159\u00edmo interagovat z virtu\u00e1ln\u00edho sv\u011bta VRChat.

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

Emul\u00e1tor je realizov\u00e1n ve shaderu ve form\u011b vlastn\u00ed dynamick\u00e9 textury (Unity Custom Render Texture), dopln\u011bn\u00e9 nab\u00edzen\u00fdmi skripty Udon pro VRChat, kter\u00e9 se pou\u017e\u00edvaj\u00ed k \u0159\u00edzen\u00ed emul\u00e1toru b\u011bhem jeho provozu. Obsah opera\u010dn\u00ed pam\u011bti a stav procesoru emulovan\u00e9ho syst\u00e9mu se ukl\u00e1d\u00e1 ve form\u011b textury s rozm\u011bry 2048×2048 pixel\u016f. Emulovan\u00fd procesor pracuje na frekvenci 250 kHz. Krom\u011b Linuxu m\u016f\u017ee b\u00fdt v emul\u00e1toru spu\u0161t\u011bn tak\u00e9 Micropython.

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

Pro organizaci trval\u00e9ho ukl\u00e1d\u00e1n\u00ed dat s podporou \u010dten\u00ed a z\u00e1pisu se pou\u017e\u00edv\u00e1 trik spojen\u00fd s objektem Camera p\u0159ipojen\u00fdm k obd\u00e9ln\u00edkov\u00e9 oblasti generovan\u00e9 shaderem a sm\u011brem v\u00fdstupu vykreslovan\u00e9 textury do shaderu. T\u00edmto zp\u016fsobem m\u016f\u017ee b\u00fdt jak\u00fdkoli pixel zapsan\u00fd b\u011bhem prov\u00e1d\u011bn\u00ed pixelov\u00e9ho shaderu p\u0159e\u010dten p\u0159i zpracov\u00e1n\u00ed dal\u0161\u00edho sn\u00edmku. <\/p>\n

P\u0159i pou\u017eit\u00ed pixelov\u00fdch shader\u016f je pro ka\u017ed\u00fd pixel textury paraleln\u011b spu\u0161t\u011bn samostatn\u00fd instance shaderu. Tato vlastnost v\u00fdrazn\u011b komplikuje implementaci a vy\u017eaduje samostatnou koordinaci stavu cel\u00e9ho emulovan\u00e9ho syst\u00e9mu a p\u0159i\u0159azen\u00ed pozice zpracov\u00e1van\u00e9ho pixelu k zak\u00f3dovan\u00e9mu CPU stavu nebo obsahu RAM emulovan\u00e9ho syst\u00e9mu (ka\u017ed\u00fd pixel m\u016f\u017ee k\u00f3dovat 128 bit\u016f informac\u00ed). K\u00f3d shaderu p\u0159itom vy\u017eaduje za\u0159azen\u00ed obrovsk\u00e9ho mno\u017estv\u00ed kontrol, k jejich\u017e zjednodu\u0161en\u00ed byl pou\u017eit perl-preprocesor perlpp.

\r\n \"P\u0159ehr\u00e1t\r\n
<\/div>\r\n <\/div><\/center>
\n
Zdroj: 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\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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