Method shaderSetup

src/IECoreGL/PointsPrimitive.cpp:198–272

}

const Shader::Setup *PointsPrimitive::shaderSetup( const Shader *shader, State *state ) const
{
	Type type = effectiveType( state );
	if( type == Point )
	{
		// rendering as gl points goes through the normal process
		return Primitive::shaderSetup( shader, state );
	}
	else
	{
		// for rendering as disks, quads or spheres, we build a custom setup which we use
		// for instancing primitives onto our points.
		for( MemberData::InstancingSetupVector::const_iterator it = m_memberData->instancingSetups.begin(), eIt = m_memberData->instancingSetups.end(); it != eIt; it++ )
		{
			if( it->originalShader == shader && it->type == type )
			{
				return it->shaderSetup.get();
			}
		}

		ConstShaderPtr instancingShader = shader;
		ShaderStateComponent *shaderStateComponent = state->get<ShaderStateComponent>();
		if( instancingShader->vertexSource() == "" )
		{
			// if the current shader has specific vertex source, then we assume the user has provided
			// a shader capable of performing the instancing, but if not then we substitute in our own
			// instancing vertex shader.
			ShaderLoader *shaderLoader = shaderStateComponent->shaderLoader();
			instancingShader = shaderLoader->create( instancingVertexSource(), "", shader->fragmentSource() );
		}

		Shader::SetupPtr instancingShaderSetup = new Shader::Setup( instancingShader );
		shaderStateComponent->addParametersToShaderSetup( instancingShaderSetup.get() );
		addPrimitiveVariablesToShaderSetup( instancingShaderSetup.get(), "vertex", 1 );

		instancingShaderSetup->addUniformParameter( "useWidth", new BoolData( static_cast<bool>( m_memberData->widths ) ) );
		if( !m_memberData->constantWidth )
		{
			instancingShaderSetup->addUniformParameter( "constantwidth", new FloatData( 1.0f ) );
		}
		instancingShaderSetup->addUniformParameter( "useAspectRatio", new BoolData( static_cast<bool>( m_memberData->patchAspectRatio ) ) );
		instancingShaderSetup->addUniformParameter( "useRotation", new BoolData( static_cast<bool>( m_memberData->rotations ) ) );

		switch( type )
		{
			case Disk :
				if( !m_memberData->diskPrimitive )
				{
					m_memberData->diskPrimitive = new DiskPrimitive( 0.5f );
				}
				m_memberData->diskPrimitive->addPrimitiveVariablesToShaderSetup( instancingShaderSetup.get(), "instance" );
				break;
			case Sphere :
				if( !m_memberData->spherePrimitive )
				{
					m_memberData->spherePrimitive = new SpherePrimitive( 0.5f );
				}
				m_memberData->spherePrimitive->addPrimitiveVariablesToShaderSetup( instancingShaderSetup.get(), "instance" );