Editing Nintendo 64 emulators
Jump to navigation
Jump to search
Warning: You are not logged in. Your IP address will be publicly visible if you make any edits. If you log in or create an account, your edits will be attributed to your username, along with other benefits.
The edit can be undone.
Please check the comparison below to verify that this is what you want to do, and then save the changes below to finish undoing the edit.
| Latest revision | Your text | ||
| Line 1,006: | Line 1,006: | ||
One of the biggest hurdles to emulating the Nintendo 64 was the Reality Display Processor (RDP), which used a custom design that had to be fine-tuned to get more performance out of the system using microcode. To emulate the RDP accurately, one would have to execute said microcode the way the RDP did, which differed from the PC graphics cards of the day. To complicate matters further, API standards available on PCs two decades ago were nowhere near as flexible as they are today. If you wanted to make an accurate GPU-accelerated RDP plugin in 2003, you simply couldn't with the APIs of the time (OpenGL 1.x and Direct3D 9). For the average user, hardware-accurate GPU acceleration would be out of reach for a long time. | One of the biggest hurdles to emulating the Nintendo 64 was the Reality Display Processor (RDP), which used a custom design that had to be fine-tuned to get more performance out of the system using microcode. To emulate the RDP accurately, one would have to execute said microcode the way the RDP did, which differed from the PC graphics cards of the day. To complicate matters further, API standards available on PCs two decades ago were nowhere near as flexible as they are today. If you wanted to make an accurate GPU-accelerated RDP plugin in 2003, you simply couldn't with the APIs of the time (OpenGL 1.x and Direct3D 9). For the average user, hardware-accurate GPU acceleration would be out of reach for a long time. | ||
| − | [[UltraHLE]] offered a compromise. In contrast to earlier consoles (whose video chips, in hindsight, had been easy to render to the host CPU's framebuffer), performant RDP emulation had to take shortcuts, including programming around specific games' microcode to cleanly translate their graphics commands into API calls using Direct3D, OpenGL, and even Glide. With this, the theoretical system requirements plummeted, and the host graphics card could reproduce a functional equivalent rather than the exact method. This also gave way to prettier, higher-resolution graphics, though whether this is an improvement is subjective and a common point of discussion. Unfortunately, it proved to be hit or miss, owing to the nature of per-game microcode detection and having to tweak settings to prevent some games from running into graphical glitches. | + | [[UltraHLE]] offered a compromise. In contrast to earlier consoles (whose video chips, in hindsight, had been easy to render to the host CPU's framebuffer), performant RDP emulation had to take shortcuts, including programming around specific games' microcode to cleanly translate their graphics commands into API calls using Direct3D, OpenGL, and even Glide. With this, the theoretical system requirements plummeted, and the host graphics card could reproduce a functional equivalent rather than the exact method. This also gave way to prettier, higher-resolution graphics, though whether or not this is an improvement is subjective and a common point of discussion. Unfortunately, it proved to be hit or miss, owing to the nature of per-game microcode detection and having to tweak settings to prevent some games from running into graphical glitches. |
Low-level RDP emulation was continually improved in that time, most notably by [[MESS]] up until its merger with [[MAME]], where its RDP code was turned into a plugin by Angrylion. Compatibility-wise, Angrylion's RDP was considered flawless by the community. Though the reception wasn't as warm overall, since it ran only on the CPU and was thus painfully slow on mid-grade machines. A dozen forks attempted to bring the system requirements down, and the current incarnation that does so is Angrylion RDP Plus, using multithreading. Accurate low-level emulation would only come to the GPU in 2020 when a new version of the Mupen64Plus-based ParaLLEl [[libretro]] core was released containing a rewritten RDP plugin using compute shaders in Vulkan. Though it isn't a direct fork of Angrylion, Themaister says the Angrylion code was the central point of reference for developing the plugin,<ref>[https://github.com/Themaister/parallel-rdp#disclaimer README] for parallel-rdp repository on GitHub. § Disclaimer. "While paraLLEl-RDP uses Angrylion-Plus as an implementation reference, it is not a port, and not a derived codebase of said project. It is written from scratch by studying Angrylion-Plus and trying to understand what is going on. The test suite uses Angrylion-Plus as a reference to validate implementation and cross-checking behavior."</ref> meaning ParaLLEl uses the same strategies that Angrylion does to emulate the RDP while running on the host GPU (as long as said GPU supports Vulkan). | Low-level RDP emulation was continually improved in that time, most notably by [[MESS]] up until its merger with [[MAME]], where its RDP code was turned into a plugin by Angrylion. Compatibility-wise, Angrylion's RDP was considered flawless by the community. Though the reception wasn't as warm overall, since it ran only on the CPU and was thus painfully slow on mid-grade machines. A dozen forks attempted to bring the system requirements down, and the current incarnation that does so is Angrylion RDP Plus, using multithreading. Accurate low-level emulation would only come to the GPU in 2020 when a new version of the Mupen64Plus-based ParaLLEl [[libretro]] core was released containing a rewritten RDP plugin using compute shaders in Vulkan. Though it isn't a direct fork of Angrylion, Themaister says the Angrylion code was the central point of reference for developing the plugin,<ref>[https://github.com/Themaister/parallel-rdp#disclaimer README] for parallel-rdp repository on GitHub. § Disclaimer. "While paraLLEl-RDP uses Angrylion-Plus as an implementation reference, it is not a port, and not a derived codebase of said project. It is written from scratch by studying Angrylion-Plus and trying to understand what is going on. The test suite uses Angrylion-Plus as a reference to validate implementation and cross-checking behavior."</ref> meaning ParaLLEl uses the same strategies that Angrylion does to emulate the RDP while running on the host GPU (as long as said GPU supports Vulkan). | ||
