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  #1  
Old 07-10-2010, 09:35 PM
12171217 12171217 is offline
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Stencil buffer.

Why can't we touch the stencil buffer in GS2?

I wanted to do reflection effects for players in water, among many other things..
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  #2  
Old 07-11-2010, 12:39 AM
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This can probably be interesting but could you explain a little bit more what you want to do and how?
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Old 07-11-2010, 03:12 AM
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You would enable writing to the stencil buffer by doing a generic function, like
graphicsEnable(STENCIL_BUFFER);

then, you would, in most cases, clear the stencil buffer before you start using it.
graphicsClear(STENCIL_BUFFER);

Following, since you're in stencil mode, any showimgs, anything that would normally be drawn to the draw buffer is now drawn to the stencil buffer. You set an operation using
setStencilOp(STENCILOP);
and could choose from the following operations:

NPC Code:
STENCILOP_KEEP
STENCILOP_ZERO
STENCILOP_REPLACE
STENCILOP_INVERT
STENCILOP_INCR
STENCILOP_DECR



Finally, after creating a proper stencil buffer, you could then test against it when drawing images:
stencilTestFunc(STENCILTEST);

NPC Code:
STENCILTEST_NEVER
STENCILTEST_LESS
STENCILTEST_LESSEQUAL
STENCILTEST_EQUAL
STENCILTEST_GREATER
STENCILTEST_GREATEREQUAL
STENCILTEST_NOTEQUAL
STENCILTEST_ALWAYS



Setting a reference value could just be something like
stencilSetReference(int);

Could be used for tons of stuff.. Parallax scrolling backgrounds, reflections of sky images in water, reflections of players in water.. Tons of very interesting uses if it's put to good use.

If you've ever used the stencil buffer in an OpenGL application, you'd be familiar with how to use it and you'd see a bunch of potentional, too
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  #4  
Old 07-13-2010, 08:52 PM
12171217 12171217 is offline
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Not to mention this could be used to clip images against bounding boxes, for minigames and such.. I really ****ing need that, especially since clipping showpolys is slow compared to taking advantage of the stencil buffer.
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  #5  
Old 07-26-2010, 08:21 AM
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Bump.
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  #6  
Old 08-03-2010, 05:59 PM
Dnegel Dnegel is offline
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This sounds interesting, should do something with it.
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  #7  
Old 08-07-2010, 02:04 AM
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u cud use it to fulfil my dream~
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  #8  
Old 08-07-2010, 04:25 AM
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Quote:
Originally Posted by Crono View Post
u cud use it to fulfil my dream~
I've been wanting reflections for so long

Graal needs way more special effects. It can add so much atmosphere!
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Old 08-07-2010, 04:27 AM
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u cud use it to fulfil my dream~
I've always wanted a lake and a fence.
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  #10  
Old 08-07-2010, 05:18 AM
12171217 12171217 is offline
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Stencil buffer plz <3

Also, render-to-texture support while we're at it! If I'm not mistaken in the technique you use for certain GUIControls, it's nothing more than adapting your GUIDrawingPanel's.
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  #11  
Old 08-13-2010, 12:50 PM
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I guessing this would be more efficient than having an extra image/NPC, rotating it, and lowering the alpha?
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Old 08-13-2010, 12:50 PM
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I guessing this would be more efficient than having an extra image/NPC, rotating it, and lowering the alpha?
Hell yes!
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Old 08-13-2010, 01:35 PM
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Parallax scrolling backgrounds
Hell yes
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  #14  
Old 08-13-2010, 03:16 PM
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So graal will go from basically Zelda 3 with upgrades to to pretty much the four sword adventures? Effects wise. I vote yes.
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  #15  
Old 08-14-2010, 01:43 AM
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Would be nice if graal could compete with other 1-man team indie games someday.
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