[Shallows-devel] Updating shader attributes from within Renderable::render

[Christopher D. <e.c...@cm...>]

I tried updating an uniform attribute from within Renderable::render with
the mechanisms of shallows, but

	void Foo::render() const
	{
	    ...
	    for(size_t i=0; i<m_Nt; i++) {
	        m_shader->setParam3fv("b", 9, &m_tri_data[i].b[0]);
	        ...
	   }
	}

fails with:

	sview: src/GLProgram.cpp:432: GLint
	shallows::GLProgram::validate_uniform(const char*) const:
	Assertion `it != uniformsNameToType_.end() && "Internal
	Shallows error. The uniform map does not correspond with
	OpenGL."' failed. 
	Aborted

However, if I circumvent a little bit by adding 

	unsigned int getProgramHandle() const { return programHandle_; }

in GLProgram, the following

	void Foo::render() const
	{
	    GLint location = glGetUniformLocation(m_shader->getProgramHandle(), "b");
	    if(location == -1)
	        throw std::runtime_error("fuuuu");

	    for(size_t i=0; i<m_Nt; i++) {
	        glUniform3fv(location, 9, &m_tri_data[i].b[0]);
	        ...
	   }
	}

works like a charm.

Could it be possible to add a back-door to do stuff like this, or does
it completely break with the philosophy? The location index, or at
least the program handle, is also needed for throwing uniform shader
variables into buffer objects.

-- 
Chris