Update PHILOSOPHY.md

PHILOSOPHY.md

@@ -1,5 +1,6 @@
+# `accurate` branch
 Being a pure, plain decompilation of the original `Doukusu.exe` file (v1.0.0.6),
-there should not be much to say about the project's philosophies:
+there should not be much to say about this branch's philosophies:
 
 ## Goal
 The end-goal is for the project to be able to produce an `.exe` file that is
@@ -8,15 +9,16 @@ decompiled code should ideally be made to produce the same assembly code as the
 original, bugs should be left intact, etc.
 
 Another goal of the project is to document Cave Story's inner-working, so code
-should be reasonably-annotated.
+should be reasonably-annotated. Likewise, bugs should be documented, and fixes
+provided wrapped in `#ifdef FIX_BUGS` conditions.
 
 ## Accuracy to the original source code
-I do aim to make the decompiled code _functionally_-accurate to the original,
+Personally, I do aim to make the decompiled code _functionally_-accurate to the
-down to generating the same assembly code, but I do not aim for
+original, down to generating the same assembly code, but I do not aim for
 _visually_-accurate code.
 
-Despite this, I personally do try to preserve the original function/variable
+Despite this, I do try to preserve the original function/variable names,
-names, variable-declaration locations, and source file naming.
+variable-declaration locations, and source file naming.
 
 Part of the reason why I do not aim for visually-accurate source code is that we
 know from the [Organya source code release](https://github.com/shbow/organya/)
@@ -24,11 +26,71 @@ what Pixel's code-style looked like, and I find it **extremely** hard to read.
 
 ## Language
 Cave Story's developer, Pixel, primarily speaks Japanese, but his code's
-variable/function names are mostly written in English (with rare instances of
+variable/function names are mostly written in English (with a few rare instances
-Romanised Japanese).
+of Romanised Japanese).
 
 The Organya source code release indicates Pixel wrote his comments in Japanese,
 however, in this project, I prefer them to be written in English.
 
 The English employed in this project is a mix of American English, Canadian
 English, and British English.
+
+# `portable` branch
+This branch takes a different direction to the `accurate` branch, but they still
+share some core philosophies:
+
+## Goal
+The goal is still to accurately-reproduce Cave Story's original code, but
+modified to the extent that it is easy to port to other platforms. This branch
+is intended for purists that don't want to use Windows or its deprecated APIs.
+
+Notably, this means bugs should still be left intact. However, bugs and other
+coding errors that affect portability should be fixed.
+
+For comparison, I believe this branch shares some parallels with the
+Chocolate Doom project, except perhaps more strict. See the link below for their
+list of philosophies which may be applicable here:
+
+https://github.com/chocolate-doom/chocolate-doom/blob/master/PHILOSOPHY.md
+
+## Custom code
+Cave Story's original source code was written in C++, but stylised like C89
+(with a number of exceptions). Custom code added to the project should follow
+suit, but the C-style doesn't have to be C89 - personally, I prefer to write in
+the subset of C99 that C++98 allows.
+
+I prefer compiler-specific code to be avoided, since more-portable code benefits
+all compilers, and keeps the codebase free of clutter.
+
+# `enhanced` branch
+This branch deviates the most from the `accurate` branch, focussing less on
+authenticity, and more on improving the base engine.
+
+## Goal
+This branch is intended to benefit modders, by providing a feature-rich base for
+mods (think 'GZDoom' rather than 'Chocolate Doom').
+
+That said, I want to avoid the codebase becoming an over-engineered mess of
+seldom-used and niche features - only features with a strong reason to be
+included should be added.
+
+Current sources for features include...
+* The "Cave Story Mod Loader" (widescreen, support for Ogg Vorbis music)
+* Common custom TSC commands ('<MIM', '<PHY')
+* Other common "EXE hacks" developed by the modding community (custom weapons, money system)
+
+## Target audience
+While this branch is meant as a base for mods, it is not intended for modders
+unfamiliar with programming. This means features that only exist to benefit
+non-programmers will not be accepted, as they will likely clutter the codebase,
+making it harder for programmers to make modifications.
+
+## Accuracy to the original source code
+Despite this branch being less accuracy-focussed, I still want modifications to
+the vanilla code to be minimal - that means no rewriting code to "look nicer" or
+add micro-optimisations.
+
+Keeping the vanilla code intact guarantees CSE2E will accurately-reproduce
+Cave Story's gameplay, avoiding an NXEngine-scenario where the game is riddled
+with inaccuracies, both small and large. This also has the benefit of making it
+easier to merge changes from the other branches.