Hello,
I am having problems with a uniform value getting trumped in a shader.
Here is most of the shader fragment:
___________________________________________________________________
os << "\nuniform bool PreMultipliedAlpha;\n";
os << "uniform vec4 FogUniform;\n";
os << " vec3 FogColor;\n";
os << " vec3 FogUniformColor;\n";
os << "void main()\n";
os << "{\n";
os << " if (PreMultipliedAlpha) {\n";
os << " FogColor = gl_Fog.color.rgb * gl_FragColor.a;\n";
if (aFogType == EXP2_FOG)
os << " FogUniformColor = FogUniform.rgb *
gl_FragColor.a;\n";
os << " } else {\n";
os << " FogColor = gl_Fog.color.rgb;\n";
if (aFogType == EXP2_FOG)
os << " FogUniformColor = FogUniform.rgb;\n";
os << " }\n";
______________________________________________________________________
Now, to use it, I have this code...
osg::Group *Topgroup = new osg::Group; // real code this has more stuff
attached.
osg::Group *group = new osg::Group;
Topgroup->addChild(group);
// modelA and modelB groups already exist.
modelA->getOrCreateStateSet()->getOrCreateUniform("PreMultipliedAlpha",
osg::Uniform::BOOL)->set(true);
modelB->getOrCreateStateSet()->getOrCreateUniform("PreMultipliedAlpha",
osg::Uniform::BOOL)->set(false);
group->addChild(modelA);
group->addChild(modelB);
// Then the Fragment shader is added to the Topgroup node.
// Didn't include code here because it is long, and it works as shown
below.
Here is what happens.
When modelA and modelB are added to the group as shown above, the
uniform is always false.
If I comment out the line:
//group->addChild(modelB);
Then I have the uniform set correctly to true.
Reinserting that line, and commenting out
group->addChild(modelA);
Has the uniform set correctly to false.
It seems that I can't have both models added with different uniform
values without one trumping the other.
Am I doing something wrong or is this a bug?
I've tried more obvious things conditional on the uniform value, like
making the model red or blue with same results.
OSG 1.2, Windows XP
Thanks,
Chris
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