Hi James,
Its not direct answer to your questions but a code snippet overloading
Program which I used to change shader variant depending on compilation/link
result (from most advanced to more basic fallbacks). This approach was
quite simple I tested Program compilation result (including
compilation/ling log) by simply checking if my Program was really applied
after Program::apply() and if not adopted fallback to less demanding
shaders. Not sure if this will solve your problem but perhaps will be a
step forward to proper solution.
class MyProgram: public osg::Program
{
public:
MyProgram( ): _shaderVariant( DefaultShaderVariant )
{
osg::Shader * vertShader = osgDB::readShaderFile(
osg::Shader::VERTEX, "MyVertexShader.glsl" );
osg::Shader * fragShader = osgDB::readShaderFile(
osg::Shader::FRAGMENT, "MyFragmentShader.glsl" );
addShader( vertShader );
addShader( fragShader );
notified.resize( DefaultShaderVariant + 1 );
}
void setDigitDefine( std::string MACRO, int DIGIT ) const
{
// For brevity code removed but
// this function simply checks shader sources and
// finds all ocurences of
// #define MACRO DEFAULT_DIGIT
// and replaces them to
// #define MACRO DIGIT
// to select shader codepath dependant on macro value
}
void apply( osg::State& state ) const
{
while( _shaderVariant > 0 )
{
osg::Program::apply( state );
// Break if program was applied ie its not null
if( state.getLastAppliedProgramObject() != NULL )
{
if( !notified[0] )
{
std::cout<< "INFO: MyProgram - GLSL Compilation
Succeeded." << std::endl;
std::cout<< " Shader variant: " << _shaderVariant <<
std::endl;
std::cout<< " GL Vendor: " <<
glGetString(GL_VENDOR) << std::endl;
std::cout<< " GL Renderer: " <<
glGetString(GL_RENDERER) << std::endl;
std::cout<< " GL Version: " <<
glGetString(GL_VERSION) << std::endl;
notified[0] = true;
}
break;
}
if( !notified[_shaderVariant] )
{
std::string infoLog;
getPCP( state )->getInfoLog( infoLog );
std::cout<< "ERROR: MyProgram - GLSL Compilation Failed."
<< std::endl;
std::cout<< " Shader variant: " << _shaderVariant <<
std::endl;
std::cout<< " GL Vendor: " << glGetString(GL_VENDOR) <<
std::endl;
std::cout<< " GL Renderer: " << glGetString(GL_RENDERER)
<< std::endl;
std::cout<< " GL Version: " << glGetString(GL_VERSION) <<
std::endl;
std::cout<< infoLog << std::endl;
notified[_shaderVariant] = true;
}
// Switch to fallback variants if program link failed
setDigitDefine( "SHADER_VARIANT", --_shaderVariant );
}
}
protected:
mutable int _shaderVariant;
static const int DefaultShaderVariant = 2;
mutable std::vector< bool > notified;
};
Cheers,
Wojtek Lewandowski
śr., 24 lut 2021 o 19:04 'James Turner' via OpenSceneGraph Users <
osg-us...@googlegroups.com> napisał(a):
> I’m trying to extract shader compile and link info logs at runtime, so I
> can log+report them.
>
> I note osg::Program::getGlProgramInfoLog exists, obviously it takes a
> context ID since the PerContextProgram is what has the actual errors.
>
> Two things I need help with:
>
> 1) does the program log also contain shader compile errors, or is this
> only the link log? I don’t see a corresponding APi on osg::Shader, is why I
> ask
>
> 2) *when* can I call the log functions and expect to get valid results?
> Given the OSG drawing model, obviously the log won’t be available
> immediately when creating the Program.. Do I need to use a DrawCallback to
> check the log after the first time the Program has been used?
>
> I looked for examples of using getGlProgramInfoLog but unfortunately
> couldn't find any, maybe pointing me at one would answer both of these
> points.
>
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