Newbie OpenGL Questions

[nbohr1more]

So why would these images be reliable enough to feed a fragment program that must get redrawn depending on view yet not be reliable enough as a material stage input?

 

If "_scratch" is useless in a material it must also be useless for a fragment program.

 

There must be a way to fill "_scratch" predictably either for fragments or materials or it has no use ?

[OrbWeaver]

I think I've seen _scratch used to distort mirror reflections, e.g. the previous mirrorRenderMap stage filled _scratch which was then warped by a subsequent VFP stage. I could be mis-remembering though, and this may have been a suggestion which never worked in practice.

[rich_is_bored]

You cannot count on the contents of _scratch to remain unchanged between material shaders as the order in which they are rendered is semi-random. But within a single material shader it's possible to render to _scratch using mirrorRenderMap or similar keywords in one stage and then reference the resulting contents of _scratch in a later stage.

[nbohr1more]

Dumbest question in the world!!!!!!!!!!!!!!!!

 

"Can a light shader material have a reference to a fragment program?"

 

light/example

{

blendLight
noShadows

lightFalloffImage lights/squarelight1a

{

	blend 	add
map 	lights/squarelight1
zeroclamp 	// make sure it doesn't bleed over the edges
	colored 	// take rgba from entity shaderparms
}

{

	fragmentProgram example.vfp

	fragmentMap 0 _currentRender

	fragmentMap 1 path/to/texture

}

}

Edited May 9, 2011 by nbohr1more

[nbohr1more]

Thus far the answer is No...

 

It crashes Doom 3...

 

It looks like the ATI drivers can't handle this sequence...