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AppGameKit Classic Chat / Understanding shaders, making sprites glow?

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Fluorescent
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Posted: 11th Jan 2015 14:00
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I've been working on a sokoban clone as a way of understanding the different parts of making games.

Now when the player pushes a box over a target, I want to apply a shader that makes the box glow. And I've been looking through this forum and other places for more information about this.

If I understand correctly, that I need is to clear the screen. Draw the box or boxes that should glow and only those sprites. Apply a blur shader and render to image. Apply a bloom shader and render that out to an image. Then show that image on some kind of surface, redraw the rest of the scene and render to screen.

Is this correct? As an example I've been looking at the bloom shader that comes with agk and the 2d soft shadows project that Janbo posted in AppGameKit Showcase forum. Do I have to create 3d objects for this to work?
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janbo
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Posted: 11th Jan 2015 14:44 Edited at: 11th Jan 2015 14:46
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Hi,

If you want to
Quote: "understanding the different parts of making games"
you probably don't need shaders at all not?

But i see that parts of your suggestion are right.
And yes, you can make the everything sprite only.

For now you can just draw your sprites to an image and throw the Bloom shader at it.
Make sure the threshold is low enough if you want the whole sprite to be glowy.

Take a look at the User Demos there is my Demo labyrinth wich uses the Bloom Shader for glowy things(but 3D).

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baxslash
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Posted: 12th Jan 2015 08:24
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If you are talking about a 2D game then you can do all of this with 2 images pre-made in a graphics program and used as 2 separate sprites, the box drawn over the glow image.

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unlikely
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Location: Ohio, USA
Posted: 12th Jan 2015 15:48
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Yeah, for something like this effect, I'd recommend forgoing shaders and just do as baxslash suggested. It will be a lot simpler code wise (probably), and more importantly, will not be as large of a performance hit (probably.)
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