Hi clever people, I am writing a little 2d game which uses a tiles map. The tiles are in one texture which was a 24bit Bitmap. I want to display my map, but make it all black so that nothing can be seen, then slowly fade up so that they can all be seen in thier full colour. Not using a palette in case you thought that. Should I use the colour or should I use lights (which I know nothing about?). Thanks in advance for any advice. Jay

nefthy

184

July 11, 2005 06:01 AM

draw a black quad above it and change the alpfa value from 0.0f to 1.0f across several frames. Be sure to enable blending.

Fantastic Jason

Author

122

July 11, 2005 06:30 AM

They say that the best ideas aer the simplest....thats a fabtastic idea...thanks very much.

TerraX

180

July 12, 2005 06:44 AM

As you're using a quad with black colour, don't forget to change the blending function with something like..
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

(I think the default setting is glBlendFunc(GL_SRC_ALPHA, GL_ONE))

eSCHEn

394

July 12, 2005 06:57 AM

Just thought I'd add a wee tip. It is faster to disable blending using glBlendFunc(GL_ONE, GL_ZERO) than with glDisable(GL_BLEND). They amount to much the same thing.

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Cheers,
Darren Clark