Hi Terry,
I added a new OSGActiveLightsMask parameter. In your shader you can do
now something like this:
uniform int OSGActiveLightsMask;
if(OSGActiveLightsMask & 1)
...
if(OSGActiveLightsMask & 2)
...
I added an small example (OpenSG/Source/Experimental/SHL/testSHLLights.cpp)
The bad news is that the & operator is not supported by my driver.
Andreas
Thanks Andreas. That's too bad. If anyone has any other suggestions
on ways to the standard gl lighting information, I would like to hear
them.
The main thing I am worried about is using up all my available
uniforms. Each light will require somewhere between 8 and 12 uniform
floats depending on the type of light. And I want to specify OpenGL
lights anyway, so that if a shader gets too big to compile, the object
using that shader will revert to standard OpenGL lighting instead of
turning black. Since I will already be specifying that lighting
information, it would be nice to reuse it instead of specifying it
again for the shaders.
- Terry
On 6/15/05, Andreas Zieringer <[EMAIL PROTECTED]> wrote:
Hi Terry,
not yet, but you can't put this information on application level into a
uniform because in local lights render mode the active lights can change
dynamicly for each rendered node. I could add this information to the
special osg uniform parameters like "OSGViewMatrix", ...
But one index is not enough we need a array of indices or use on uniform
with a bit mask of active lights.
Well the easiest way is to add the lighting information like light
position, count, ... directly to your shader.
Andreas
When OpenSG sets up lights, is there any way to have it tell which
glLights are being used, and perhaps what type of light each one is?
I think this would be useful information for writing GLSL shaders
because it would allow me to pass only the light index as a uniform
and gank all the necessary lighting information from
gl_LightSource[i]. The alternative is to pass *all* the lighting
information as uniforms.
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Andreas Zieringer [EMAIL PROTECTED]
Fraunhofer IGD - A4 phone +49 (0)6151 155 289
Fraunhoferstr. 5 fax +49 (0)6151 155 196
D-64283 Darmstadt www.igd.fhg.de/www/igd-a4
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