tag

#fixed-point

3 posts

RetrogamingDeep Dive October 4, 2026 10 min read

GBA Affine Backgrounds: Fixed-Point Matrices and Scanline Reference Accumulators

Implement Game Boy Advance affine backgrounds correctly: 8.8 transform steps, signed reference points, per-scanline accumulators, pivots, and wrap behavior.

#game-boy-advance#gba#affine

RetrogamingDeep Dive October 4, 2026 6 min read

Nintendo 64 RSP Vector Arithmetic: Fixed Point, Accumulators, and Saturation

Understand Nintendo 64 RSP vector multiply, fixed-point rounding, the 48-bit accumulator, saturation, and emulator tests that expose hidden-state bugs.

#nintendo-64#rsp#vector-unit

RetrogamingDeep Dive October 4, 2026 8 min read

PlayStation GTE: Fixed-Point Transforms, Saturation, and FLAG Semantics

Trace PS1 GTE inputs, fixed-point transforms, command timing, saturation, and FLAG summaries without replacing guest arithmetic with host floats.

#playstation#gte#fixed-point