Hi all.
>From my experience with shaders, you get this error when you have setting a
uniform which is not declared _nor_ used in the shader. The glsl-compiler, at
least for nvidia, then optimizes away that parameter, so when setting it, you
get an error.
Looking at your shaders, you are trying to modify a uniform? (Thats not right,
use a varying for that) And it is not declared uniform in the fragment shader?
Be consistent. And, make sure you actually use that uniform somewhere.
Hope it helps.
/Marcus
Quoting Andreas Zieringer <[EMAIL PROTECTED]>:
> Hi Oliver,
>
> hmm really strange never had such a problem. Just looked into the code
>
> GLint location = getUniformLocation(program, p->getName().c_str());
> if(location != -1)
> uniform1i(location, (GLint) p->getValue());
> else
> FWARNING(("Unknown parameter '%s'!\n", p->getName().c_str()));
>
> can't see any reason why this shouldn't work. Can you write out your
> scene as a osb file and send it to me? Perhaps it is a opengl driver
> problem?
>
> Andreas
>
> > Hi all,
> >
> > I have a very strange problem with my glsl shader and the
> > setUniformParameter function. I have two shader chunks and every chunk
> > gets the same parameters and the two fragment shaders are nearly the
> > same. Here is how I set up the parameters:
> >
> > // -------->
> >
> > // first shader chunk
> > beginEditCP(_shlChunkNVP); {
> > _shlChunkNVP->readFragmentProgram("shader/particles_nvp.frag");
> > _shlChunkNVP->setUniformParameter("scale", _fScale);
> > _shlChunkNVP->setUniformParameter("loga", _bLoga);
> >
> > if (state == DYNAMIC) {
> > _shlChunkNVP->setUniformParameter("dynamic", true);
> > _shlChunkNVP->setUniformParameter("ipVal", _fIpVal);
> > }
> > else {
> > _shlChunkNVP->setUniformParameter("dynamic", false);
> > _shlChunkNVP->setUniformParameter("ipVal", 0.0f);
> > }
> > } endEditCP(_shlChunkNVP);
> >
> > // second shader chunk
> > beginEditCP(_shlChunkFBODir); {
> > _shlChunkFBODir->readFragmentProgram("shader/particles_fbo_dir.frag");
> > _shlChunkFBODir->setUniformParameter("scale", _fScale);
> > _shlChunkFBODir->setUniformParameter("loga", _bLoga);
> >
> > if (state == DYNAMIC) {
> > _shlChunkFBODir->setUniformParameter("dynamic", true);
> > _shlChunkFBODir->setUniformParameter("ipVal", _fIpVal);
> > }
> > else {
> > _shlChunkFBODir->setUniformParameter("dynamic", false);
> > _shlChunkFBODir->setUniformParameter("ipVal", 0.0f);
> > }
> > } endEditCP(_shlChunkFBODir);
> >
> > // <--------
> >
> > But I get an error while runtime.
> > WARNING: Unknown parameter 'dynamic'!
> > and this is for the second chunk and I don't know why. The other
> > parameters are also correct. And the parameters are marked as uniform in
> > the shader (these entries are the same in both fragment programs):
> >
> > // -------->
> >
> > uniform bool dynamic;
> > uniform bool loga;
> > uniform float ipVal;
> > uniform float scale;
> >
> > // <--------
> >
> > The funny thing is, when I change the type from bool to float (in shader
> > and program), it is the same. When I change the name in both files, it
> > is the same. I have an ugly workaround, but it would be nice to have it
> > correctly:
> >
> > // -------->
> >
> > if (state == DYNAMIC) {
> > _shlChunkFBODir->setUniformParameter("params", Vec2f (1.0f,1.0f));
> > _shlChunkFBODir->setUniformParameter("ipVal", _fIpVal);
> > }
> > else {
> > _shlChunkFBODir->setUniformParameter("params", Vec2f (0.0f,0.0f));
> > _shlChunkFBODir->setUniformParameter("ipVal", 0.0f);
> > }
> >
> > // <--------
> >
> > and in the shader:
> >
> > // -------->
> >
> > uniform vec2 params;
> > bool dynamic;
> >
> > void main(void) {
> > if (params.x == 0) dynamic = false;
> > else dynamic = true;
> > ...
> > }
> >
> > // <--------
> >
> > I wonder, if anyone has an idea?
> >
> > regards,
> > Oliver
> >
> >
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>
>
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Content preview: Hi all. From my experience with shaders, you get this
error when you have setting a uniform which is not declared _nor_ used
in the shader. The glsl-compiler, at least for nvidia, then optimizes
away that parameter, so when setting it, you get an error. [...]
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