Function GetBindlessFallbackTextureIndex

trinity/Shader/Tr2Effect.cpp:1676–1716

bool GetBindlessFallbackTextureIndex( const Tr2EffectDescription& desc, const Tr2EffectConstant& c, uint32_t& result )
{
	//Bindless are always 1D uint parameters, so filter out everything else
	if( c.type != Tr2EffectConstant::UINT || c.dimension != 1 )
	{
		return false;
	}

	//Find annotations for the parameter
	auto it = std::find_if( desc.annotations.begin(), desc.annotations.end(), [&]( Tr2EffectAnnotationMap::const_reference key ) {
		return strcmp( key.first, c.name.c_str() ) == 0;
	} );
	if( it == desc.annotations.end() )
	{
		//No annotations found, early out
		return false;
	}

	//Find the annotation that tells us what type the bindless texture has
	auto& map = it->second;
	auto found = std::find_if( map.begin(), map.end(), []( auto& x ) {
		return strcmp( x.name, "BindlessHandleType" ) == 0 && x.type == Tr2EffectParameterAnnotation::INT;
	} );
	if( found == map.end() )
	{
		return false;
	}

	if( found->intValue == Tr2EffectResource::BINDLESS_SAMPLER )
	{
		// Fallbacks values for samplers are filled separately
		return false;
	}
	auto resourceType = Tr2EffectResource::Type( found->intValue );

	auto& fallbackTexture = Tr2Renderer::GetFallbackTexture( resourceType, c.name.c_str() );

	result = fallbackTexture.GetSrvIndexInHeap();

	return true;
}

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// Description: