Method RenderPicking

trinity/ITr2PickableScene.cpp:272–322

-------------------------------------------------------------------------------------- Description: Renders picking batches into the picking buffer. Arguments: pOpaquePickingBatches - Opaque batch accumulator pPickingBatches - Picking batch accumulator pass - union of PickComponent that are to be queried during this pass. Return value: true If the rendering succeeded false On error --------------

//   false On error
// --------------------------------------------------------------------------------------
bool ITr2PickableScene::RenderPicking( ITriRenderBatchAccumulator* pOpaquePickingBatches,
									   ITriRenderBatchAccumulator* pPickingBatches,
									   PickComponents pass )
{
	USE_MAIN_THREAD_RENDER_CONTEXT(); //TODO

	// Use a shader variable for identifying which components are expected.
	// We can't use situations here because the flags might change during a single
	// frame.
	Vector4 componentsParam = Vector4(
		( pass & PICK_OBJECT ) ? 1.0f : 0.0f,
		( pass & PICK_AREA ) ? 1.0f : 0.0f,
		( pass & PICK_POSITION ) ? 1.0f : 0.0f,
		( pass & PICK_UV ) ? 1.0f : 0.0f );

	GlobalStore().RegisterVariable( "PickingComponents", componentsParam );

	float initialDepth = ( HUGE_NUMBER - Tr2Renderer::GetFrontClip() ) / ( Tr2Renderer::GetBackClip() - Tr2Renderer::GetFrontClip() );
	initialDepth = std::max( 0.0f, std::min( 1.0f, initialDepth ) );

	// Get the pick buffer
	Tr2PickBuffer& pickBuffer = GetPickBuffer();

	if( !pickBuffer.BeginRendering( initialDepth, renderContext ) )
	{
		return false;
	}

	if( pOpaquePickingBatches->GetBatchCount() )
	{
		pOpaquePickingBatches->Finalize();

		renderContext.m_esm.ApplyStandardStates( Tr2EffectStateManager::RM_PICKING );
		renderContext.RenderBatchesForPicking( pOpaquePickingBatches, BlueSharedString( "Picking" ) );
	}

	if( pPickingBatches && RenderPickingAreasForComponents( pass ) )
	{
		pPickingBatches->Finalize();

		renderContext.m_esm.ApplyStandardStates( Tr2EffectStateManager::RM_PICKING );
		renderContext.RenderBatchesForPicking( pPickingBatches, DEFAULT_TECHNIQUE );
	}

	if( !pickBuffer.EndRendering( renderContext ) )
	{
		return false;
	}

	return true;
}

namespace
{