HDMA Helpers Demo

Demonstrates the four HDMA library helper effects available in the OpenSNES SDK.

Demo

Screenshot

Effects

Button	Effect	Description
A	Brightness gradient	Fade to black at screen bottom
B	Color gradient	Sky-like color shift on background color 0
X	Iris wipe	Circular window reveal/conceal
Y	Water ripple	Wave distortion increasing top-to-bottom
D-pad	Adjust	Change parameters per active effect
START	Stop	Disable current effect

Architecture

• BG1: Static background image (OpenSNES logo)
• HDMA: One channel driven by library helper functions
• Each effect builds a per-scanline HDMA table in RAM

Modules

console sprite dma input background hdma

Related examples

• backgrounds/mode3 — the canonical "8bpp single-layer background" example. If you want the brightness/color gradient effects above applied to an 8bpp Mode 3 image instead of a 4bpp Mode 1 image, start from mode3 for the BG setup and add a hdmaBrightnessGradient() / hdmaColorGradient() call afterwards.