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Line 56: − − == Dumping existing shaders == − One method to dump shaders from commercial games and homebrew applications is running it on an emulator. − − Ryujinx[https://ryujinx.org/#/] offers in its configuration file an entry to dump the encountered shaders in two directories. ''Code'' contains shader dumps that are compatible with 'nvdisasm' and 'envydis' as they are. ''Full'' is the same as ''Code'' but it includes the header, it's intended to be decompiled with ''Ryujinx.ShaderTools''. − − yuzu[https://yuzu-emu.org/] can dump shaders using its disk-based shader cache with an external tool. ''maxwell-dump''[https://gist.github.com/ReinUsesLisp/7ba72d3162e60cab283194fcca3474b2] is a small C application for this, it follows the same convention as Ryujinx for ''Code'' and ''Full''. To find the shader file dumped by the emulator, right click the game from the Qt front-end and select the option to view the transferable cache file. It's important to highlight that the file format might change in the future leaving this tool unable to extract the binaries until it's updated. − − = Maxwell Instruction Set Architecture = − TODO Define instructions
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It is a common technique to read or write subsequent registers with a single instruction. For example TEXS (used to sample a texture) reads the texture coordinates from Ra and Ra+1, although it gets more complex with other layouts like 3D textures (it's not Ra+2). The result of the sample is given in an Rd and their subsequent registers.
It is a common technique to read or write subsequent registers with a single instruction. For example TEXS (used to sample a texture) reads the texture coordinates from Ra and Ra+1, although it gets more complex with other layouts like 3D textures (it's not Ra+2). The result of the sample is given in an Rd and their subsequent registers.
== Predicates ==
== Predicates ==
Most of the time predicates can be negated.
Most of the time predicates can be negated.
== Condition codes ==
== Condition codes ==
= Analysis Tools =
= Analysis Tools =
== Disassembling ==
== Disassembling ==
To disassemble a Maxwell shader or compute kernel there are two applications:
To disassemble a Maxwell shader or compute kernel there are two applications:
Since it's the product of reverse engineering the GPU and ''nvdisasm'' itself, it might contain errors.
Since it's the product of reverse engineering the GPU and ''nvdisasm'' itself, it might contain errors.