[osg-users] Geometry shader based apps/examples have shader compile failures...

[Mark Pai]

Hello Sebastian,

Thanks a lot for sending help. I installed the shader analyzer and started
testing my geometry shader. I found that if your code has a line comment
right before the code, as below, then the compile fails.

// some comment
out vec2 uv;

But, if you separate the line comment and the code with one blank line
like this

// some comment

out vec2 uv;

then all is well. Sure, I can live with this adjustment any day... 

So, million thanks to you for sending out timely help.

Best regards,
-Mark


[quote="SMesserschmidt"]Hi Mark,

If a shader gets compiled correcty has nothing to do with osg. You 
probably updated your driver recently. NVidia decided to follow the GLSL 
grammar more strictly.
For instance code like float x = vec2(1) is not working anymore, since 
implicit conversion of types is not allowed in GLSL. So try to fix your 
shaders with that in mind.
BTW: I'm using GPU ShaderAnalyzer[1] by AMD  to validate my shader code, 
as it seems to be awfully strict ;-)

Cheers
Sebastian

[1]
http://developer.amd.com/tools-and-sdks/graphics-development/gpu-shaderanalyzer/
[quote]Hello,

I am using OSG ver 3.4.0-Rc1 under Window 8.1, Visual Studio 2012 Win64. NVidia laptop driver Ver: 353.30.

Of-late, I started noticing strange geometry shader compile failures with applications that worked perfectly (in 3.2) after I switched to osg 3.4.0-rc1.

First-of, my own application that has one geometry shader (#version 400) that is ending up with compile errors, and then I see corrupt source string in 'src' when I did std::string src = geomObject->getShaderSource();

Variables uv, normal are correctly declared but the error log says -
GEOMETRY glCompileShader "" FAILED
GEOMETRY Shader "" infolog:
ERROR: 0:64: 'uv' : undeclared identifier
ERROR: 0:64: 'assign' :  cannot convert from '2-component vector of float' to 'float'
ERROR: 0:72: 'normal' : undeclared identifier
ERROR: 0:72: 'assign' :  cannot convert from '3-component vector of float' to 'float'

iow, original shader code says:
out vec2 uv;
out vec3 normal;

and geomObject->getShaderSource() says:
out vec2 uv;mal;

The shader source is in a text file and is read using
osg::ref_ptr<osg::Shader> geomObject = osg::Shader::readShaderFile(osg::Shader::GEOMETRY, gsFilename.txt);

Then, I also see similar geometry shader compile failures with examples such as osgForest, osgSSBO, osgTessellationShader...

I am not sure what is going on. Any help here is sincerely appreciated.

Thanks, Regards,
-Mark

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