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+date = "2017-11-09T09:46:00-04:00"
+title = "Citra Progress Report - 2017 September"
+tags = [ "progress-report" ]
+author = "anodium"
+forum = 5005
++++
+
+Winter arrives once more, and like I mentioned in [August's progress report](/entry/citra-progress-report-2017-august),
+I am extremely excited for what's in store. In fact, many of the really big goodies
+I've decided to seperate to their own articles, which should be coming up in the
+next few weeks.
+
+There's also been many changes this month that improve the speed of emulation across
+the board, on top of the usual improvements in accuracy and features. And because
+of that, I've dubbed this month #Speedtember. Let's dive right in.
+
+{{% callout %}}
+Hello everyone! We're all terribly sorry for the delay in getting this progress
+report out the door, but our main technical writer [anodium](https://github.com/anodium),
+was just a bit busy surviving both Hurricane Irma and Maria. Although she's a
+trooper and claims it's not an excuse for the delay, we find that her personal
+safety is a tad more important. We're all glad that she's safe and sound, and in
+a state where she can keep pumping out quality articles for Citra!
+{{% /callout %}}
+
+## [Switchable Page Tables](https://github.com/citra-emu/citra/pull/2952) by [MerryMage](https://github.com/MerryMage)
+
+Citra has a component called [dynarmic](https://github.com/MerryMage/dynarmic),
+which recompiles ARM11 code to x86-64 code at run time, and then executes that
+generated code, rather than interpreting the ARM11 instructions directly.
+
+Because the 3DS has a 32 bit address bus, it can address 2^32 unique memory locations.
+And because the 3DS can address data down to a byte, it can address up to 2^32
+unique bytes, or about 4 gigabytes of memory. When considering that no 3DS has ever
+been released with more than 256 *mega*bytes of memory, this sounds absurd! And
+it is... unless you consider that a 3DS uses chunks of that huge address space to
+address peripherals, among other things. This is called memory-mapped input/output
+(MMIO), and is a great use of millions of addresses that would otherwise have
+been ignored, plus it also allows handling IO the exact same way memory is handled,
+so the design can be a bit simpler as it doesn't need special circuitry to handle IO.
+
+Herein lies our problem. Because that code is now being run on a PC, those MMIO
+devices don't actually exist anymore, so Citra needs to handle those reads and
+writes itself. There's a few ways to go about it, but the simplest and most naïve
+is to replace every memory read or write with a function that checks if that address
+is mapped to memory or IO. Unfortunately, this is extremely slow, and we can't
+afford to have extremely slow address translation when games can access memory
+upwards of a few hundred thousand times per second.
+
+With this, [MerryMage](https://github.com/MerryMage) has changed this behaviour so
+that rather than replacing a read/write with a function, it instead translates the
+address using a page table, and then tries to access that address directly. On the
+page table, all addresses that map to memory simply have a memory address written down.
+But on addresses that map to IO, it has address 0 written down. Trying to read or
+write to memory address 0 on x86 is illegal for every process except the
+operating system... and Citra tries to do it anyways!
+
+When an invalid memory address (or a memory address that that process doesn't have
+permission to access) is read from or written to, x86 CPUs throw a page fault exception.
+Citra takes advantage of this behaviour by also registering an exception handler
+for page faults. If a page fault is thrown, Citra knows the game tried to access IO,
+and thus recompiles the memory read/write to a direct call to Citra's IO functions.
+This makes the usual case (memory access) extremely fast, and the less usual case
+slow, but only the first time it happens. Subsequent IO accesses use the recompiled
+functions which are faster.
+
+This technique is called fastmem, and is not new at all. In fact, Dolphin uses
+it extensively in its JIT recompiler to speed up memory access as well. And thanks
+to [MerryMage](https://github.com/MerryMage)'s hard work, this same technique is
+now used extensively by Citra.
+
+## [Give each process its own page table](https://github.com/citra-emu/citra/pull/2842) by [Subv](https://github.com/Subv)
+
+In order to support running multiple processes at the same time, like your computer,
+Citra implements virtual memory, in which each process has its own page table.
+The page table represents a translation from the process' virtual addresses, to
+the 3DS' physical (or "real") addresses.
+
+Before this, because Citra did not support multiple page tables, it also didn't
+support running multiple processes at once, such as a game and the software keyboard
+applet. Now, thanks to [Subv](https://github.com/Subv), Citra has an important
+building block in place.
+
+## [Add support for loading application updates](https://github.com/citra-emu/citra/pull/2927) by [shinyquagsire23](https://github.com/shinyquagsire23)
+
+Nintendo 3DS titles are contained within `*.app` files on the SD card or on the
+game cartridge, in the [NCCH container format](https://www.3dbrew.org/wiki/NCCH).
+This format is further divided into two formats, CXI and CFA, which stand for
+__C__TR e__X__ecutable __I__mage and __C__TR __F__ile __A__rchive, respectively.
+CXIs contain executable code, whereas CFAs cannot. CFAs usually accompany a CXI
+to provide other features such as the digital instruction manual, the Download Play
+child application, or in the case of game cartridges, system updates.
+
+Both types of NCCH start with a header, and then followed by either an ExeFS
+image, a RomFS image, or both. The entire structure of an NCCH header may be best
+explained by a diagram:
+
+{{< figure src="/images/entry/citra-progress-report-2017-september/ncch.png" 
+    title="Solid lines are required sections, dashed lines cannot be used in some cases, and dotted lines are optional sections." >}}
+
+Now, games and applications need updates from time to time, and 3DSes handle these
+by installing the update as a seperate title from the base game. From that point
+on, whenever the user tries to launch the game, instead of loading the
+extended header (or [ExHeader](https://www.3dbrew.org/wiki/ExHeader) for short)
+and ExeFS image from the base game's NCCH, it replaces them with the update's
+ExHeader and ExeFS on launch. As for RomFS, the 3DS System Software will actually
+load both the base game's and the update's RomFS image, rather than replacing one
+with the other. Games are left to their own devices on how to handle these, and
+so the methods used per game can vary, though they usually just replace changed
+files, picking files from the base game RomFS if they haven't been modified.
+
+Citra, before this PR, had the code for loading games and reading NCCH files all
+mixed into one big piece that fit in with everything else. With this patch,
+[shinyquagsire23](https://github.com/shinyquagsire23) has seperated the loader
+from the NCCH reader, allowing the loader to read multiple NCCHs at once. Additionally,
+whenever a game is loaded, the loader would also check if there is an update title
+installed on Citra's [virtual SD card](/wiki/user-directory/). If there is, it
+would replace the update ExHeader and ExeFS, and load the update RomFS as well.
+Just like a real console!
+
+Most games worked out of the box with updates, and because they wrote the code
+with accuracy in mind, this very same PR has also laid part of the foundation
+needed to handle other features such as DLC support or even using real 3DS SD cards!
+Though, do note that we don't have any estimates on either those or any other
+features, as no one is actively working on either.
+
+## [Implement geometry shader](https://github.com/citra-emu/citra/pull/2865) by [wwylele](https://github.com/wwylele)
+
+The PICA200 GPU has a pipeline similar to [OpenGL's pipeline](https://www.khronos.org/opengl/wiki/Rendering_Pipeline_Overview)
+for rendering 3D objects into a 2D display. I won't go through them all here,
+only the optional geometry shader step. Just after the vertex shader step, if
+enabled, all the vertices are processed by a shader kernel (which is a small
+program that runs directly on a GPU), taking as many vertices as the kernel
+wants as input, and outputting as many vertices as the kernel wants.
+
+Because the kernel in the geometry shader is allowed as many inputs and outputs
+as it wants, it is significantly more powerful and flexible than the vertex shader,
+whose kernel is restricted to only one vertex at a time, both for input and output.
+But for that same reason, geometry shaders are much more complex to program, and
+so many games simply disable it. The games that do not disable it though, tend to
+use it very extensively, to the point of completely breaking graphics if it's not
+implemented.
+
+Multiple uses have been found in the wild for geometry shaders, including but absolutely
+not limited to:
+
+ - Taking one vertex as input, and outputting a rectangle of vertices which can
+ be textured with a sprite. Pok&eacute;mon uses this extensively to render particles
+ whenever a move is used. Monster Hunter takes it a step further and renders
+ *all of its HUD and GUI* with this kernel.
+
+ - Taking a handful of vertices as input, and outputting even more vertices which
+ are interpolations between the inputs, thus making the resulting mesh look smoother
+ and less jagged when rendered.
+
+At first glance, geometry shaders looked like an easy problem, since they use the
+same instruction set and format as vertex shaders, so a lot of the same code could
+be reused. At *second* glance, it turned out that configuring inputs and outputs
+for geometry shaders is much more complex than it is for vertex shaders.
+
+There were actually three attempts to implement geometry shaders in Citra. The first
+was written by [ds84182](https://github.com/ds84182) about two years ago, only to
+be abandoned due to not knowing how the configuration of them was done. The second
+attempt was written by [JayFoxRox](https://github.com/JayFoxRox), but was also
+abandoned for the same reason.
+
+But, after extensive research on geometry shaders was made by [fincs](https://github.com/fincs),
+the API was implemented in [ctrulib](https://github.com/smealum/ctrulib) and
+[citro3d](https://github.com/fincs/citro3d), and examples were written to demonstrate
+how to use it. Now that the community knew exactly how they worked, [wwylele](https://github.com/wwylele)
+picked up where [JayFoxRox](https://github.com/JayFoxRox) left off, cleaned up
+the code he wrote, and added the missing pieces.
+
+After almost three years, and three different attempts to make it work, Citra now
+has a full, complete, and correct implementation of geometry shaders!
+
+## [Implement custom clip plane](https://github.com/citra-emu/citra/pull/2900) by [wwylele](https://github.com/wwylele)
+
+After the geometry shader (or the vertex shader, if it wasn't enabled), the vertices
+are "assembled" into a collection of triangles. After *that*, to make rendering
+more efficient, the triangles are then compared to 6 planes that make up the cube
+in which objects are actually visible by the camera. Any triangles outside of that
+cube are deleted, and any triangles that are partially inside the cube are split
+by the sides of the cube, and the resulting triangle outside of the cube is also
+deleted.
+
+But the 3DS allows games to add a 7th plane whose position is fully customizable.
+Although no games are known to use this feature right now, it is indeed a feature
+of the 3DS' GPU. Because implementing it was fairly straightforward,
+[wwylele](https://github.com/wwylele) decided to just go ahead and implement it,
+in case someone decided to use it in the future.
+
+## [Optimized Morton](https://github.com/citra-emu/citra/pull/2951) by [huwpascoe](https://github.com/huwpascoe)
+
+Morton code is a function that interleaves multi-dimensional numbers into a one-dimensional
+number. Although it may seem like a very esoteric function, it's actually extremely
+useful in fields like linear algebra, databases, and what the 3DS uses it for:
+texture mapping.
+
+Computers have an intermediate chunk of memory between RAM and the CPU called a
+cache. Caches are seperated into lines, each of which can hold one data item. GPUs
+also have a cache, also seperated into lines. Because they are seperated like this,
+if a texture is loaded into the cache, it would have to span multiple cache lines,
+or even not fit into the cache completely, thus making transformations on it slow,
+as it would have to load and store pieces of it from RAM multiple times.
+
+To avoid this, GPUs can Morton encode textures so that two-dimensional manipulations
+are more likely to only need data already in the cache. Textures that have been
+Morton coded are usually referred to as swizzled or twiddled textures.
+
+{{< figure src="/images/entry/citra-progress-report-2017-september/morton-koopa.png#floatright" 
+    title="Not this Morton!" >}}
+
+In the function that Morton is implemented, there was a lookup table on Morton
+codes in the comments, and [huwpascoe](https://github.com/huwpascoe) thought it'd
+be best if we just use the lookup table directly. It worked just as well as before,
+but required less than a third of the math. Because this function is called so
+often during emulation (a rough estimate from them is about "millions of times a
+second"), this change although small, made very big changes in CPU performance.
+
+## [Add draw for immediate and batch modes](https://github.com/citra-emu/citra/pull/2921) by [jroweboy](https://github.com/jroweboy)
+
+The 3DS' GPU has two main modes for drawing to the screen, immediate and batch
+mode. In the former, the GPU takes and immediately draws every vertex as it is
+handed to it. In the latter, the GPU accepts vertices given to it, but doesn't
+actually bother drawing them until absolutely necessary, saving a bit of time
+from not having to go through the drawing procedure for every individual vertex.
+Although most games don't use immediate mode at all due to it being extremely
+slow, a handful do use it for a handful of visual effects, like New Super Mario
+Bros. 2.
+
+About a year ago when the GPU code on Citra was rewritten, a handful of calls to
+the drawing routine were removed, as it was believed they were unnecessary. Turns
+out, one of the calls was actually needed for some effects in games, as it handled
+immediate mode drawing. This wasn't noticed for a very long time, as most games
+appeared to carry on with no side-effects at all from the rewrite, but was eventually
+found after some research courtesy of [ds84182](https://github.com/ds84182).
+
+## [Interpolate audio samples on a frame-by-frame basis](https://github.com/citra-emu/citra/pull/2858) by [MerryMage](https://github.com/MerryMage)
+
+When a 3DS game needs some sort of audio processing, they can access the 3DS' DSP,
+or __D__igital __S__ound __P__rocessor. It's another processor, alongside the ARM9
+and ARM11, that is given a firmware to run, which in turn is given a bunch of audio
+samples and parameters by the game. The DSP then plays back the buffer in chunks
+of about 5 milliseconds. Each one of these chunks is called an audio frame.
+
+As of today, we don't know how the DSP exactly works, and we don't know how any
+of the firmwares exactly work. (Did I forget to mention earlier there's multiple
+versions of the firmware?) But we do know how to use it, and from there we can
+reimplement its behaviour directly in Citra. Which is exactly what [MerryMage](https://github.com/MerryMage)
+did back in June of 2016, which in turn brought [audio support for the first time](/entry/hle-audio-comes-to-citra/)
+in Citra.
+
+This approach, although having the advantages of being easier to implement, easier
+to understand in code, and has a higher potential of being faster, it has the
+disadvantage that accuracy suffers significantly, especially when shortcuts are
+taken for the sake of speed. One of these shortcuts was in the audio interpolation,
+which is a way of inferring more audio samples from relatively very few existing
+samples.
+
+On a real 3DS, games are allowed to interpolate different audio frames with
+different functions, even when in they're in the same buffer. On the other hand,
+Citra interpolated the entire buffer with one function as soon as it was loaded.
+This led to various effects and music in games to sound strange or inaccurate in
+some way.
+
+One example of this is Deku Link's footsteps in *The Legend of Zelda: Majora's Mask 3D*.
+
+Here's the output of a real 3DS console, for reference:
+
+{{< audio src="/images/entry/citra-progress-report-2017-september/deku-hardware.ogg" >}}
+
+And here's the output of Citra, before this was fixed:
+
+{{< audio src="/images/entry/citra-progress-report-2017-september/deku-pre2858.ogg" >}}
+
+Now that it's been fixed, his footsteps sound a lot better:
+
+{{< audio src="/images/entry/citra-progress-report-2017-september/deku-post2858.ogg" >}}
+
+Audio emulation in Citra is still somewhat inaccurate for now, though
+[MerryMage](https://github.com/MerryMage) is gradually working on fixing and
+improving it. Perhaps some day we may even be able to emulate the DSP firmware
+directly, which will be much more accurate than merely emulating its behaviour.
+
+## [Use deque instead of vector for the audio buffer](https://github.com/citra-emu/citra/pull/2958) by [Subv](https://github.com/Subv)
+
+Whenever the DSP consumes some frames from the audio buffer, Citra deletes them
+from it. This normally wouldn't pose any problems, but because the buffer was
+being stored as a vector, this led to some uneccessary operations. Namely, the
+C++ standard requires that all the data of a standard vector be in one contiguous
+block of memory. Because deleting frames from the buffer breaks this rule, Citra
+would automatically (1) allocate a new block of memory, (2) copy the entire buffer
+into that new block of memory, and (3) deallocate the old block of memory, thus
+deleting the old buffer.
+
+These steps are huge waste of time, as Citra doesn't need to guarantee that the
+audio buffer is in one contiguous block. So [Subv](https://github.com/Subv) changed
+the type of the buffer from a vector to a deque, which is essentially a queue that
+you can remove data from both the beginning and end of it. Because the contiguity
+requirement doesn't exist in deques, Citra doesn't do the uneccessary copying,
+leading to huge speed boosts in audio bound titles like Super Mario 3D Land, and
+even the Home Menu. Now, both run significantly faster!
+
+## [Add mingw64 compile support to appveyor](https://github.com/citra-emu/citra/pull/2912) by [jroweboy](https://github.com/jroweboy)
+
+When a program is written in a high-level programming language, such as C++, Rust,
+or Go, before the program can be run on a machine, it must be translated or "compiled"
+to machine code. Although it is possible to do this translation by hand, it is
+usually extremely difficult to do so and very time consuming. So instead, we have
+a program called a compiler than can automatically do this translation for us.
+
+This is also why a program compiled for an ARM machine cannot be run directly on
+an x86 machine, even when the source can work on either machine without issues.
+Instead this program must be translated, interpreted, or recompiled from source
+to x86. (In fact, this translation is exactly what [dynarmic](https://github.com/MerryMage/dynarmic)
+does to run code from a 3DS.)
+
+Every statement in a program must have an exact, unambiguous definition of what
+it does (its semantics). But, in the same way that a statement that means one
+thing can be written many different ways, and different compilers can translate the
+same statement many different ways.
+
+On Windows, there's two popular C++ compilers available as of today: MSVC++, which
+is the compiler Microsoft has written for Windows, and MINGW GCC, which is actually
+a port of the Linux `gcc` compiler to Windows. For better or worse, MINGW GCC
+optimizes Citra a little better than MSVC++, and so [jroweboy](https://github.com/jroweboy)
+has changed the Citra AppVeyor build script to add support for MINGW GCC as well
+as MSVC++. Do note that the MSVC++ builds are only available through GitHub, since
+they're only useful for debugging, and MINGW GCC builds are faster in most, if
+not all, cases, which is why the installer will only install those. This change
+also has closed the gap in performance the new Nightly builds had compared to
+the old Bleeding Edge builds.
+
+## [Load different shared font depending on the region](https://github.com/citra-emu/citra/pull/2915) by [wwylele](https://github.com/wwylele)
+
+Remember that last month [wwylele](https://github.com/wwylele) changed Citra so
+that instead of loading the shared font from a seperate file, it would
+[load it from the system archive](https://citra-emu.org/entry/citra-progress-report-2017-august/)?
+This builds on top of that behaviour. You see, a 3DS doesn't have a shared font,
+it has *four*. One contains glyphs for Latin script (for English, Spanish, Italian,
+French, etc.) and Japanese scripts, another contains glyphs for Traditional Chinese,
+the third font contains those for Simplified Chinese, and the last font contains
+the ones for Korean.
+
+Before this PR, Citra would simply load the first shared font regardless of game
+or region. This made non-Latin or non-Japanese script games display completely
+incorrect characters at best, or crash at worst. Now Citra will load the appropriate
+shared font from the system archive depending on the region selected, just like
+a real console! Though, this will not work on machines that only have the
+`shared_font.bin` file, because it only contains the shared font for the region
+of the console it was dumped from. (e.g.: If you dump a Korean console, it'll
+only contain the Korean font.) If you want to use this feature, you must dump
+the system archive using the latest version of [`3dsutils`](https://github.com/citra-emu/3dsutils).
+
+## Et. al.
+
+And of course, big thanks to [everyone who's contributed](https://github.com/citra-emu/citra/graphs/contributors?from=2017-08-31&to=2017-09-30&type=c)
+this September, because Citra as a whole would not be the same without everyone
+involved having placed their pieces, big or small.
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