Weapon Alpha

[Bombshell93]

game maker has always had terrible compatibility issues from version to version, the change so much in gml a lot with no reason whatsoever.
also a note, you're probably better off in a palette swapper passing in a group of vec3's as palette and determine the colour by the w component, which you can decompose and edit in pretty much any good image editing program.

Code:

int paletteIndex = int(textureSample.w * PALETTE_COLOR_COUNT); //probably going 16 colors in the palette would work fine
vec3 paletteColor = uniformPalette[paletteIndex];

it allows you the freedom of on the fly palette swapping,
back on topic, how many animations are you looking to use underwater? because you have a lot more freedom with textures than you'd think, adding a new set wouldn't be much of a cost short of HD sprites