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It uses multiple subpasses to compose the final image: the first subpass draws the opaque geometry depth map and the shadows casted on them. The second one is capable of order-independent transparency with per-pixel sorting performed by the GPU.
(The Open GL renderer only has around 6000 lines of code.) So what do we get?Īs with Open GL, there are actually two Vulkan renderers: The first one uses a traditional single render pass with per-triangle or per-mesh sorting done by the CPU. Last time I checked, the Vulkan renderer had 47 source files and around 7800 lines of code.
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The downside of Vulkan is the sheer amount of code you have to write to display just a single triangle on the screen, let alone a full-featured Dreamcast renderer. So you can expect less overhead, more reliability and better performance in many cases. Vulkan works much closer to the hardware than Open GL does. Vulkan is radically different in that everything must be declared in advance, in great details, and there’s very little room for improvisation on the part of the driver. And when it doesn’t, performance suffers.
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The downside of this is that the Open GL driver often needs to guess what you’ll do next and he might not guess right. You just throw stuff at the driver when you need to and the driver’s job is to figure it out. Open GL is quite permissive and has little declarative constraints. You won’t find this feature in Open GL or DirectX, and you need a pretty recent version of these APIs to be able to emulate it, which means manually sorting individual pixels from back to front and blending them together, and doing this for each visible pixel on the screen! OK, but what about Vulkan?įor those of you who are not familiar with Vulkan, it is a relatively new 3D graphics API, basically a follow-on to Open GL. And even today this is still not trivial to implement even on modern hardware. But there’s one thing that the PVR2 does really well, and it’s order-independent transparency. You might think it should be easy to emulate such an ancient chip on modern hardware, right? Well … yes for the most part. Now the Dreamcast GPU is more than 20 years old. Successors of the PowerVR2 would later be found in the original iPhone and iPod Touch (PowerVR4), iPhone 4 and iPad (PowerVR5) and many many other mobile devices. The PowerVR2 supported DirectX 6.0, which was the graphics API used by Windows CE games on the Dreamcast. It was one of the first generations of 3D chips, with only a fixed pipeline. The renderer is the emulator component that emulates the Dreamcast/Naomi GPU chip, namely the PowerVR Series2.
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Update your core later today to get the latest version with the Vulkan renderer! Available for Android, Windows, and Linux.įor more information, read down below… Wait … a new what? Completely open-source, written from scratch, and available later today on RetroArch. Thus you can enjoy the vast majority of the SEGA back catalogue right from the comfort of your PC.The first Dreamcast emulator ever to get a Vulkan renderer. NullDC is a very powerful Dreamcast emulator with a wide list of compatible games. It can even emulate the VMU, a small LCD screen that showed integrated images right on the console controller itself.
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Thus, for example, you can load graphics plugins that use different libraries depending on your computer or iso loading system. One of the most interesting features of NullDC is the ability to load different plugins for different emulator elements. They are all perfectly compatible and, with the appropriate configuration options, will look even better than on the original console. Games of the caliber of Shenmue, Crazy Taxi, Marvel Vs Capcom 2, Soul Calibur, Jet Set Radio, and Dynamite Cop are just some of the titles you can enjoy with NullDC.
NullDC is a Dreamcast emulator, the last console to be released by SEGA, and which all these years later is still considered one of the best consoles ever.
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