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PSX GPU library, part of PSn00bSDK
2019 Lameguy64 / Meido-Tek Productions
Licensed under Mozilla Public License
Open source implementation of the GPU library written mostly in MIPS
assembly. Supports DMA transfers for ordering table draw and transferring
image data to VRAM. The syntax is intentionally made to closely resemble
Sony's syntax for familiarity and to make porting homebrew made using the
official SDK to PSn00bSDK a little easier.
Library developer(s):
Lameguy64
Library header(s):
hwregs_a.h (GNU assembler port defs)
psxgpu.h
Todo list:
* VSync() and DrawSync() functions lack alternate operating modes such as
getting number of vsyncs elapsed and waiting until a specified number of
vsyncs have passed.
* (old) VSync interrupt handler should be hooked using BIOS function
SetCustomExitFromException() like the official GPU library instead of
hooking an event handler, but said hook never seems to work. Perhaps
something in the kernel area needs to be patched/set or some event/IRQ
handler needs to be removed as such handlers can skip the custom
exception exit entirely.
It also appears that all interrupt handling in the official libraries
are done through the GPU library. This would also explain why the
official documentation tells you to always call ResetGraph() at the
very beginning of your programs.
* ClearOTag() function (non reverse version of ClearOTagR()) yet to be
implemented.
* StoreImage() equivalent yet to be implemented.
Changelog:
05-23-2019 by Lameguy64:
* Got custom exit handler set using SetCustomExitFromException() (BIOS
function B(19h)) working. Currently used to acknowledge VSync IRQ but
actual VSync handling is still done with events and needs to be
transferred to the custom exit handler. At least it lets BIOS
controller functions to work now. See doc/dev notes.txt for details
on how this handler behaves.
* Made stack usage a lot less wasteful in ResetGraph() (you only need
to allocate N words on stack based on N arguments of the function
being called.
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