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  Coloring White Textures  (Read 1364 times)
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Offline nhmllr

Senior Devvie

Medals: 1
Projects: 3

slow and steady...

« Posted 2012-07-04 14:08:40 »

So I'm using the standard OpenGL/LWJGL setup

There's this effect I want to get, but I don't know how I should go about it
I have a texture that's either completely white or completely transparent
I want to make it so that it changes color over time
I know how the RGB color system works, so game logic isn't the problem

Which methods should I use to color this texture? Is it even possible to color an individual texture?

Offline davedes
« Reply #1 - Posted 2012-07-04 15:37:32 »

Depends on your needs. Are you coloring the whole thing a solid color? Or is it a gradient, or a pattern, etc?

If you just need a solid colour, render a quad (or two tris) and modulate the vertex colours (glColor4f) over time.

Offline nhmllr

Senior Devvie

Medals: 1
Projects: 3

slow and steady...

« Reply #2 - Posted 2012-07-04 17:09:34 »

The whole idea is that the color only changes where the texture is colored white
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Offline davedes
« Reply #3 - Posted 2012-07-04 17:46:12 »

... Try giving us some more details if you want help.

Vertex colours will modulate your opaque white pixels; the transparent pixels will be ignored since their alpha will be zero.

Offline nhmllr

Senior Devvie

Medals: 1
Projects: 3

slow and steady...

« Reply #4 - Posted 2012-07-04 21:23:36 »

I realized that setting "glColor3f()" before drawing my quads will tint my sprites in the way that I was going for. I wasn't clear on that before

Offline davedes
« Reply #5 - Posted 2012-07-04 23:09:17 »

Are you purposefully trying to make your issue vague and ambiguous? Clueless Like I said...
... Try giving us some more details if you want help.

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