{"id":230326,"date":"2016-01-07T16:08:02","date_gmt":"2016-01-07T15:08:02","guid":{"rendered":"https:\/\/cms.galaxiemedia.fr\/tomshardware\/2016\/01\/07\/imgtec-promet-du-ray-tracing-dans-nos-smartphones\/"},"modified":"2023-06-22T19:20:56","modified_gmt":"2023-06-22T17:20:56","slug":"imgtec-promet-du-ray-tracing-dans-nos-smartphones","status":"publish","type":"post","link":"https:\/\/www.tomshardware.fr\/imgtec-promet-du-ray-tracing-dans-nos-smartphones\/","title":{"rendered":"ImgTec promet du ray-tracing dans nos smartphones"},"content":{"rendered":"<p><span style=\"text-decoration:none\">Imagination Technologies (ImgTec) n&#8217;est certes pas une marque aussi connue que Qualcomm ou ARM, pourtant, il y a des chances que vous ayez d\u00e9j\u00e0 entendu parler de leurs produits ou que vous en ayez un en poche. C&#8217;est en effet la soci\u00e9t\u00e9 derri\u00e8re les GPU PowerVR qui ont eurent leur heure de gloire dans les ann\u00e9es 90 dans nos PC et sont aujourd&#8217;hui dans tous les iPhone. On lui doit \u00e9galement la plupart des puces d&#8217;architecture MIPS.<\/span><\/p>\n<\/p>\n<p><span class=\"imgContent imgCenter\"><span class=\"imgWrapperOutter\"><span class=\"imgWrapperInner\"><span class=\"iZoom\"><img alt=\"Image 1 : ImgTec promet du ray-tracing dans nos smartphones\" decoding=\"async\" width=\"600\" height=\"401\" src=\"https:\/\/www.tomshardware.fr\/content\/uploads\/sites\/3\/2016\/01\/wizard-3-1-600x401.jpg\" class=\"attachment-purch-600 size-purch-600\" alt=\"\" \/><\/span><\/span><\/span><\/span><\/p>\n<\/p>\n<p><span style=\"text-decoration:none\">Le PowerVR Wizard GR6500, prend la forme d&#8217;une petite carte PCIe, simple slot, sans ventilateur, qui ne demande que 10 W. Au premier coup d&#8217;oeil, elle n&#8217;a l&#8217;air de rien, mais dans un concours de ray-tracing, elle bat \u00e0 plate couture une Nvidia 980 Ti.<\/span><\/p>\n<\/p>\n<p><span class=\"imgContent imgCenter\"><span class=\"imgWrapperOutter\"><span class=\"imgWrapperInner\"><span class=\"iZoom\"><img alt=\"Image 2 : ImgTec promet du ray-tracing dans nos smartphones\" decoding=\"async\" width=\"600\" height=\"401\" src=\"https:\/\/www.tomshardware.fr\/content\/uploads\/sites\/3\/2016\/01\/wizard-10-1-600x401.jpg\" class=\"attachment-purch-600 size-purch-600\" alt=\"\" \/><\/span><\/span><\/span><\/span><\/p>\n<\/p>\n<p><span style=\"text-decoration:none\">\u00c0 ce stade, il est sans doute utile de rappeler ce qu&#8217;est le ray-tracing, ou lancer de rayons en fran\u00e7ais. En un mot, il s&#8217;agit d&#8217;une technique permettant de cr\u00e9er de mani\u00e8re ultrar\u00e9aliste l&#8217;\u00e9clairage d&#8217;une sc\u00e8ne, \u00e0 partir des r\u00e9flexions successives des rayons de lumi\u00e8re incidents sur les divers objets. Pixar l&#8217;utilise dans ses films pour am\u00e9liorer l&#8217;apparence des surface brillantes et c&#8217;est une des raisons pour lesquelles le rendu de ces long-m\u00e9trages prend tellement de temps. \u00c0 cause de sa perfection mais de sa tr\u00e8s grande complexit\u00e9, le ray-tracing fait figure de saint Graal pour les artistes 3D et pendant de longues ann\u00e9es, on l&#8217;a cru hors de port\u00e9e.<br \/><\/span><\/p>\n<\/p>\n<p><span style=\"text-decoration:none\">Le test expos\u00e9 par Imagination Technologies \u00e9tait le rendu d&#8217;une seule image d&#8217;un robot, en plusieurs passes. Chaque passe augmentait le niveau de d\u00e9tail et la qualit\u00e9 du rendu. Le PowerVR Wizard produisit une image convenable si vite que nous v\u00eemes m\u00eame pas les diff\u00e9rentes passes, alors que l&#8217;image produite par la GTX 980 Ti monta lentement en qualit\u00e9. Au final, le Wizard fut 5x plus rapide.<\/span><\/p>\n<\/p>\n<p><span class=\"imgContent imgCenter\"><span class=\"imgWrapperOutter\"><span class=\"imgWrapperInner\"><span class=\"iZoom\"><img alt=\"Image 3 : ImgTec promet du ray-tracing dans nos smartphones\" decoding=\"async\" width=\"600\" height=\"300\" src=\"https:\/\/www.tomshardware.fr\/content\/uploads\/sites\/3\/2016\/01\/wizard-1-600x300.jpg\" class=\"attachment-purch-600 size-purch-600\" alt=\"\" \/><\/span><\/span><\/span><\/span><\/p>\n<\/p>\n<p><span style=\"text-decoration:none\">Le secret de cette performance est \u00e9videmment un circuit con\u00e7u sp\u00e9cifiquement pour le ray-tracing, une RTU (Ray Tracing Unit) associ\u00e9 \u00e0 un GPU traditionnel, lui aussi issu de la famille PowerVR<\/span>. Comme nous l&#8217;\u00e9crivions il y a presque deux ans, \u00ab le GR6500 est ainsi l&#8217;\u00e9quivalent du GX6450, un GPU de sixi\u00e8me g\u00e9n\u00e9ration chez PowerVR, mais avec une unit\u00e9 d\u00e9di\u00e9e. \u00bb<\/p>\n<\/p>\n<p>Depuis la pr\u00e9sentation du projet, en mars 2014, ImgTec a donc eu le temps de peaufiner son architecture et de produire les premi\u00e8res cartes. Celles pr\u00e9sent\u00e9es au CES sont grav\u00e9es en 28 nm, il y a donc un certain potentiel de progression une fois qu&#8217;elles seront pass\u00e9es sur des proc\u00e9d\u00e9s FinFET 16 nm ou 14 nm.<\/p>\n<p>Pour autant, tout n&#8217;est pas parfait. Parmi les d\u00e9mos pr\u00e9par\u00e9es par ImgTec, l&#8217;une employait quatre Wizard pour rendre une sc\u00e8ne cr\u00e9\u00e9e avec le moteur Unity. Ces quatre cartes GR6500 g\u00e9n\u00e9raient un total de 300 millions de rayons par seconde, ce qui permettaient d&#8217;afficher la sc\u00e8ne en Full HD \u00e0 30 images par seconde. Il manque donc encore de la puissance pour atteindre le niveau de performances auquel sont habitu\u00e9s les joueurs.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Imagination Technologies a profit\u00e9 du CES pour montrer son PowerVR Wizard GR6500, une carte PCI-Express passive, ne consommant que 10 W, mais capable de faire du Ray-tracing \u00e0 la vitesse d'une GeForce GTX 980 Ti.<\/p>","protected":false},"author":82,"featured_media":230327,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[487,4072,4071,4104],"tags":[],"hubs":[],"class_list":["post-230326","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualite","category-cartes-graphiques","category-processeurs","category-smartphones"],"acf":{"post_show_excerpt":true,"post_source":{"title":"Tom's Hardware 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