This page lists planned features, incomplete subsystems, and known bugs within the PowerBlocks SDK.

It is intended to help contributors understand priority areas and to help set expectations for users.

If you discover an issue not listed here or want to dive deeper into something already listed, please open a report on the PowerBlocks GitHub Issues Page.

Toolchain & Compiler

PowerPC 750CL SIMD Support

The “paired-singles” SIMD instructions on the PowerPC 750CL are an IBM extension to the standard 750 core. LLVM’s PowerPC backend does not currently implement support for these instructions.

They are documented on: https://wiibrew.org/wiki/Paired_single

Past attempts to upstream support were made years ago, but the LLVM backend has changed significantly since then, so those patches are no longer compatible.

Long-term goals:

Add paired-single support to LLVM
Investigate whether auto-vectorization for paired-singles is feasible

Video Interface (VI)

Confirm Video Modes

PowerBlocks currently provides many video modes based on prior homebrew conventions.
Some of these may not be necessary, and some may not work correctly on all consoles or display setups.

Video Blackout During Initialization

The video subsystem does not currently black out the screen during initialization.
This results in visible glitching or artifacts during boot. A proper blackout would prevent this.

GX

Missing Features

Display lists
TEV color swapping
Indirect texturing
Texture LOD support

Wii Remotes (Wiimotes)

Missing Extensions

MotionPlus
Classic Controller Pro
Drawsome Graphics Tablet
Guitar Hero Guitar
Guitar Hero Drums
DJ Hero Turntable
Taiko no Tatsujin TaTaCon drum controller
uDraw GameTablet
Densha de GO! Shinkansen Controller
Wii Balance Board

File System

SD Card Hot-Swapping

SD card mounting and unmounting has not been fully tested.
Hot-swap handling will need to be implemented cleanly.

Missing POSIX Functions

Many standard POSIX filesystem functions are only partially implemented or untested.

Bugs

rand() Crash

Using rand() currently results in a crash.
The cause has not yet been investigated.

framebuffer_fill_rgba() Incorrect Fill Colors

Drawing small rectangles (e.g., 5×5) sometimes results in incorrect or “random” colors.
This appears related to UV or pitch calculations when dimensions are not multiples of two.

Wiimote Example Crash on Startup

The Wiimote example occasionally crashes with a black screen during early initialization.
A system reboot consistently fixes the issue, suggesting that the cause is uninitialized or stale memory rather than the Wiimote code itself.