javascript - Defining transpency in bmp files -
a game i'm researching, has textures on interface. textures in-game transparent. game old (1999) , textures saved .bmp . here sample texture file: sample texture interface file this game written in c++. here's question: how possible, game understands parts of .bmp , black , transparent surface? can give me idea, how define 1 well? i'm working in canvas (javascript, babylonjs ), need idea, not code.