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add much more detail about supported platforms

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misc/portability.md
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@ -2,6 +2,63 @@ Although most of the code is platform-independent, some per-platform functionali
By default I try to automatically define appropriate backends for your OS in Core.h. Define ```CC_BUILD_MANUAL``` to disable this.
## Before you start
* IEEE floating support is required.
* int must be 32-bits. 32-bit addressing (or more) is required.
* Support for 8/16/32/64 integer types is required. (your compiler must support 64-bit arithmetic)
In other words, the codebase can theroetically be ported to any modern-ish hardware, but not stuff like a UNIVAC machine, the SuperFX chip on the SNES, or an 8-bit microcontroller.
## Supported platforms
**Note:** Some of these machines are just virtual machines. Should still work on real hardware though.
#### Tier 1 support
These platforms are regularly tested on and have executables automatically compiled for. (see buildbot.sh)
|Platform|Machine|Notes|
|--------|-------|-----|
|Windows x86/x64 | Windows 7 |
|macOS x86/x64 | macOS 10.12 |
|Linux x86/x64 | Xubuntu 14 |
|Web client | Chrome |
#### Tier 2 support
These machines are far less frequently tested on, but are otherwise same as tier 1 support.
|Platform|Machine|Notes|
|--------|-------|-----|
|Windows x86 | Windows 2000 |
|Windows x86 | 98 + KernelEX | Updating doesn't work
|Windows x64 | Windows 10 |
|Linux x64 | Arch linux |
|Linux x64 | Linux Mint |
|Linux x64 | Kubuntu |
|Linux x64 | Debian |
|Linux x64 | Fedora |
|Linux x86/x64 | Lubuntu |
|Web client | Firefox |
|Web client | Safari |
|Web client | Edge | Cursor doesn't seem to disappear
#### Tier 3 support
The game has been compiled and run on these platforms before. It may or may not still compile for them.
I don't really test these platforms at all, only when I suspect some changes to the code might impact them.
|Platform|Machine|Notes|
|--------|-------|-----|
|macOS x86 | macOS 10.4 |
|FreeBSD x86 | FreeBSD | x64 should work too |
|NetBSD x86 | NetBSD | x64 should work too |
|OpenBSD x86 | OpenBSD | x64 should work too |
|Solaris x86 | OpenIndiana | x64 should work too |
|macOS PPC | macOS 10.3 | PPC64 completely untested |
|Linux PPC | Debian | Issues with colour channels incorrectly swapped? |
|Linux ARM | Raspberry pi | ARM64 should work too |
|Linux SPARC | Debian | Didn't really work due to lack of 24-bit colours |
## Porting
Listed below are the requirements for implementing each platform-dependent file.
You should try to take advantage of existing backends when porting to other platforms.