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# PSn00bSDK
PSn00bSDK is a 100% free and open source SDK project for the original Sony
PlayStation for developing homebrew applications and games for the console.
This SDK may be used for freeware, commercial, and open source homebrew
projects as far as what the SDK currently supports. Out of all the open
source PS1 SDK projects that have come and gone from active development
over the years, PSn00bSDK is arguably the most capable of them all.
Much of the SDK is merely just a set of libraries (`libpsn00b`) and some
utilities for converting executables and data files to formats more usable
on the target platform. The compiler used is just the standard GNU GCC
toolchain compiled to target mipsel and has to be acquired separately.
The library API was deliberately written to resemble the library API of the
official libraries as closely as possible not only for familiarity reasons
to experienced programmers but also so that existing sample code and tutorials
that have been written over the years would still apply to this SDK, as well
as making the process of porting over existing homebrew originally made with
official SDKs easier with minimal modificationn provided they do not depend
on libgs.
PSn00bSDK is currently a work in progress and cannot really be considered
production ready, but what is currently implemented should be enough to
produce some interesting homebrew with the SDK especially with its extensive
support for the GPU and GTE hardware. There's no reason not to fully support
hardware features of a target platform when said hardware features have been
fully documented for years (nocash's PSX specs document in this case).
Most of `libpsn00b` is written mostly in MIPS assembly more so functions that
interface with the hardware. Many of the standard C functions are implemented
in custom MIPS assembly instead of equivalents found in the BIOS ROM, for both
stability (the BIOS `libc` implementation of the PlayStation is actually buggy)
and performance reasons.
## Notable features
As of November 28, 2021
* Extensive GPU support with polygon, line and sprite primitives, high-speed
DMA transfers for VRAM data and ordering tables. All video modes for both
NTSC and PAL standards also supported with fully adjustable display area
and automatic video standard detection based on last GPU mode. No BIOS
ROM checks used.
* Extensive GTE support with rotate, translate, perspective correction and
lighting fully supported via C and assembly GTE macros paired with high
speed matrix and vector functions. All calculations performed in fixed
point integer math, not a single float defined.
* Flexible interrupt service routine with easy to use callback mechanism for
simplified handling and hooking of hardware and DMA interrupts, no crude
event handler hooks or kernel hacks providing great compatibility with
HLE BIOS implementations. Should work without issue for loader/menu type
programs as well.
* Complete Serial I/O support with SIOCONS driver for tty stdin/stdout
console access. Hardware flow control also supported.
* BIOS controller functions for polling controller input work as intended
thanks to proper handling of hardware interrupts. No crude manual polling
of controllers in a main loop. BIOS memory card functions may also work,
but not yet tested extensively.
* Full CD-ROM support via libpsxcd with data read, CD audio and XA audio
playback support. Features built-in ISO9660 file system parser for locating
and querying files and directories. Supports directories containing more
than 30 files (classic ISO9660 only, no Rock Ridge or Joliet extensions)
and also supports reading new sessions on a multi-session disc.
* Experimental support for compiling separate sections of an executable into
shared library files (DLLs) and linking them dynamically at runtime, plus
support for function and variable introspection by loading a map file
generated at build time.
* Uses Sony SDK library syntax for familiarity to experienced programmers
and to make porting existing homebrew projects to PSn00bSDK easier.
* Works on real hardware and most popular emulators.
* Fully expandable and customizable to your heart's content.
## Obtaining PSn00bSDK
PSn00bSDK has switched to a CMake-based build and installation system. See
[installation.md](doc/installation.md) for details.
Prebuilt SDK packages and versions of the GCC toolchain for Windows and Linux
(DEB/RPM) are available through GitHub Actions. Stable releases haven't yet
been published however, due to this project being in a work-in-progress state.
It is still recommended to build the SDK from source for the time being.
## Examples
There are a few examples and complete source code of `n00bdemo` included in the
`examples` directory. More example programs may be added in the future and
contributed example programs are welcome.
There's also [Lameguy's PlayStation Programming Tutorial Series](http://lameguy64.net/tutorials/pstutorials)
for learning how to program for the PlayStation. The tutorials should still
apply to PSn00bSDK.
## To-do List
* psxspu: Plenty of work to be done. Hardware timer driven sound/music
system may need to be implemented (an equivalent to the Ss* series of
functions in libspu basically). Need to figure out the correct frequency
table for playing sounds in musical note notation. Functions that make use of
the SPU RAM interrupt feature to play or capture streamed audio should also
be added.
* psxcd: Implement a command queue mechanism for the CD-ROM?
* libc: Improve the memory allocation framework with multiple allocators, GC
and maybe helpers to manage swapping between main RAM and VRAM/SPU RAM.
* Support for MDEC, and tooling to transcode videos to .STR files (either
reimplementing the container and compression format used by the Sony SDK, or
a custom format with better compression).
* Pad and memory card libraries that don't use the BIOS routines.
## Credits
Main developer/author/whatever:
* **Lameguy64** (John "Lameguy" Wilbert Villamor)
Contributors:
* **spicyjpeg**: dynamic linker, CMake scripts, some docs and examples
(`system/dynlink`, `sound/spustream`, `io/pads`, `io/system573`).
Honorable mentions:
* **ijacquez**: helpful suggestions for getting C++ working.
* **Nicolas Noble**: his OpenBIOS project gave insight to how the BIOS works
internally.
Helpful contributors can be found in the changelog.
References used:
* [nocash's PlayStation specs document](http://problemkaputt.de/psx-spx.htm)
and Nicolas Noble's [updated version](https://psx-spx.consoledev.net).
* MIPS and System V ABI specs (for the dynamic linker).
* Tails92's PSXSDK project (during PSn00bSDK's infancy).
Additional references can be found in individual source files.
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