gctex

gctex is a Rust crate designed for encoding and decoding texture formats used in the Nintendo GameCube and Wii games. The library provides C bindings, making it useful in both Rust and C/C++ based projects.

Usage

Rust

The following snippet demonstrates how to encode a texture in CMPR format using Rust:

let width: u32 = 32;
let height: u32 = 32;
let src = vec![0; (width*height*4) as usize];
let dst = gctex::encode(gctex::TextureFormat::CMPR, &src, width, height);

C# Bindings

See https://github.com/riidefi/RiiStudio/tree/master/source/gctex/examples/c%23

byte[] dst = new byte[dst_len];
byte[] src = new byte[src_len];
gctex.Encode(0xE /* CMPR */, dst, src, width, height);

C/C++

See https://github.com/riidefi/RiiStudio/tree/master/source/gctex/examples/c%2b%2b

#include "gctex.h"

unsigned char dst[dst_len];
unsigned char src[src_len];
rii_encode_cmpr(dst, sizeof(dst), src, sizeof(src), width, height);

The relevant header is available in include/gctex.h.

Supported Formats

All supported texture formats and their respective encoding and decoding sources are listed below.

Please note, SIMD texture decoding for I4, I8 and IA8 formats uses SSE3 instructions with a fallback to SSE2 if necessary (excepting I4), and these are implemented based on the Dolphin Emulator's texture decoding logic.

Optional Features

• To avoid needing a C++ compiler or running C++ code, unset the cpp_fallback feature to fallback to non-SIMD Rust implementations of I4/I8/IA8/RGB565/RGB5A3 decoding.
• For debugging the simd feature can be disabled to use pure, standard Rust.

License

This dynamically linked library is published under GPLv2.