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Template:Problems/Shader Compilation Stuttering: Difference between revisions
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Template:Problems/Shader Compilation Stuttering (view source)
Revision as of 02:15, 29 June 2018
, 29 June 2018Removing strike out. Stuttering still occurs in Dolphin's default configuration. There are options to address it now, but there are tradeoffs and users need to be informed - that's what this is for! It is not "fixed".
(Minor adjustments. Not sure about the last note, feel free to improve) |
(Removing strike out. Stuttering still occurs in Dolphin's default configuration. There are options to address it now, but there are tradeoffs and users need to be informed - that's what this is for! It is not "fixed".) |
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''{{PAGENAME}}'' is one of the most susceptible titles to shader compilation stuttering. The GC and Wii have no concept of shaders - everything is executed directly by the hardware without an intermediate programming language (API). Modern computers and mobile systems do not work in this way, requiring the use of shaders as an intermediary so your system's GPU can perform the tasks that the GC and Wii GPU performed directly. Shaders have to be generated though, and since GC/Wii games are not designed to create shaders ahead of time as a PC game would, when a new effect appears Dolphin has to delay the CPU thread while the GPU thread performs the compilation; a pause that does not exist on the consoles. For most games shader generation takes only a few milliseconds, but for a few demanding titles, the shaders that they generate are so large that they can result in noticeable stuttering, in severe cases pauses of over a second may occur. | ''{{PAGENAME}}'' is one of the most susceptible titles to shader compilation stuttering. The GC and Wii have no concept of shaders - everything is executed directly by the hardware without an intermediate programming language (API). Modern computers and mobile systems do not work in this way, requiring the use of shaders as an intermediary so your system's GPU can perform the tasks that the GC and Wii GPU performed directly. Shaders have to be generated though, and since GC/Wii games are not designed to create shaders ahead of time as a PC game would, when a new effect appears Dolphin has to delay the CPU thread while the GPU thread performs the compilation; a pause that does not exist on the consoles. For most games shader generation takes only a few milliseconds, but for a few demanding titles, the shaders that they generate are so large that they can result in noticeable stuttering, in severe cases pauses of over a second may occur. | ||
Since {{revision|5.0-4869}}, this problem can be solved by enabling [https://dolphin-emu.org/blog/2017/07/30/ubershaders/ ubershaders]. <s>Changing GPU, updating GPU drivers, or updating Dolphin may invalidate the shader cache, requiring specialized shaders to be compiled again.</s> Since {{revision|5.0-6461}}, Dolphin caches shader pipeline UIDs independently of the video backend and compiles them on game start. This allows cached shaders to work across different video backends, platforms, hardware configurations and even Dolphin versions as long as changes aren't made to Dolphin's actual shader pipeline. These shaders are compiled in the background when the game starts, which may cause stuttering for a short period. Enable '''Compile Shaders Before Starting''' to avoid this.</includeonly><noinclude>{{documentation}}</noinclude> | |||