/// Initialize all resources provided by this manager.
///
/// @see Cleanup(), PostConfigUpdate()
bool RenderResourceManager::Initialize()
{
	// Release any existing resources.
	Cleanup();

	// Get the renderer and graphics configuration.
	Renderer* pRenderer = Renderer::GetInstance();
	if ( !pRenderer )
	{
		return false;
	}

	Config* pConfig = Config::GetInstance();
	if ( !HELIUM_VERIFY( pConfig ) )
	{
		return false;
	}

	StrongPtr< GraphicsConfig > spGraphicsConfig( pConfig->GetConfigObject< GraphicsConfig >( Name( "GraphicsConfig" ) ) );
	if ( !spGraphicsConfig )
	{
		HELIUM_TRACE( TraceLevels::Error, "RenderResourceManager::Initialize(): Initialization failed; missing GraphicsConfig.\n" );
		return false;
	}

	// Create the standard rasterizer states.
	RRasterizerState::Description rasterizerStateDesc;

	rasterizerStateDesc.fillMode = RENDERER_FILL_MODE_SOLID;
	rasterizerStateDesc.cullMode = RENDERER_CULL_MODE_BACK;
	rasterizerStateDesc.winding = RENDERER_WINDING_CLOCKWISE;
	rasterizerStateDesc.depthBias = 0;
	rasterizerStateDesc.slopeScaledDepthBias = 0.0f;
	m_rasterizerStates[RASTERIZER_STATE_DEFAULT] = pRenderer->CreateRasterizerState( rasterizerStateDesc );
	HELIUM_ASSERT( m_rasterizerStates[RASTERIZER_STATE_DEFAULT] );

	rasterizerStateDesc.cullMode = RENDERER_CULL_MODE_NONE;
	m_rasterizerStates[RASTERIZER_STATE_DOUBLE_SIDED] = pRenderer->CreateRasterizerState( rasterizerStateDesc );
	HELIUM_ASSERT( m_rasterizerStates[RASTERIZER_STATE_DOUBLE_SIDED] );

	rasterizerStateDesc.depthBias = 1;
	rasterizerStateDesc.slopeScaledDepthBias = 2.0f;
	m_rasterizerStates[RASTERIZER_STATE_SHADOW_DEPTH] = pRenderer->CreateRasterizerState( rasterizerStateDesc );
	HELIUM_ASSERT( m_rasterizerStates[RASTERIZER_STATE_SHADOW_DEPTH] );

	rasterizerStateDesc.depthBias = 0;
	rasterizerStateDesc.slopeScaledDepthBias = 0.0f;
	rasterizerStateDesc.fillMode = RENDERER_FILL_MODE_WIREFRAME;
	m_rasterizerStates[RASTERIZER_STATE_WIREFRAME_DOUBLE_SIDED] = pRenderer->CreateRasterizerState(
		rasterizerStateDesc );
	HELIUM_ASSERT( m_rasterizerStates[RASTERIZER_STATE_WIREFRAME_DOUBLE_SIDED] );

	rasterizerStateDesc.cullMode = RENDERER_CULL_MODE_BACK;
	m_rasterizerStates[RASTERIZER_STATE_WIREFRAME] = pRenderer->CreateRasterizerState( rasterizerStateDesc );
	HELIUM_ASSERT( m_rasterizerStates[RASTERIZER_STATE_WIREFRAME] );

	// Create the standard blend states.
	RBlendState::Description blendStateDesc;

	blendStateDesc.bBlendEnable = false;
	m_blendStates[BLEND_STATE_OPAQUE] = pRenderer->CreateBlendState( blendStateDesc );
	HELIUM_ASSERT( m_blendStates[BLEND_STATE_OPAQUE] );

	blendStateDesc.colorWriteMask = 0;
	m_blendStates[BLEND_STATE_NO_COLOR] = pRenderer->CreateBlendState( blendStateDesc );
	HELIUM_ASSERT( m_blendStates[BLEND_STATE_NO_COLOR] );

	blendStateDesc.colorWriteMask = RENDERER_COLOR_WRITE_MASK_FLAG_ALL;
	blendStateDesc.bBlendEnable = true;

	blendStateDesc.sourceFactor = RENDERER_BLEND_FACTOR_SRC_ALPHA;
	blendStateDesc.destinationFactor = RENDERER_BLEND_FACTOR_INV_SRC_ALPHA;
	blendStateDesc.function = RENDERER_BLEND_FUNCTION_ADD;
	m_blendStates[BLEND_STATE_TRANSPARENT] = pRenderer->CreateBlendState( blendStateDesc );
	HELIUM_ASSERT( m_blendStates[BLEND_STATE_TRANSPARENT] );

	blendStateDesc.sourceFactor = RENDERER_BLEND_FACTOR_ONE;
	blendStateDesc.destinationFactor = RENDERER_BLEND_FACTOR_ONE;
	m_blendStates[BLEND_STATE_ADDITIVE] = pRenderer->CreateBlendState( blendStateDesc );
	HELIUM_ASSERT( m_blendStates[BLEND_STATE_ADDITIVE] );

	blendStateDesc.function = RENDERER_BLEND_FUNCTION_REVERSE_SUBTRACT;
	m_blendStates[BLEND_STATE_SUBTRACTIVE] = pRenderer->CreateBlendState( blendStateDesc );
	HELIUM_ASSERT( m_blendStates[BLEND_STATE_SUBTRACTIVE] );

	blendStateDesc.sourceFactor = RENDERER_BLEND_FACTOR_DEST_COLOR;
	blendStateDesc.destinationFactor = RENDERER_BLEND_FACTOR_ZERO;
	blendStateDesc.function = RENDERER_BLEND_FUNCTION_ADD;
	m_blendStates[BLEND_STATE_MODULATE] = pRenderer->CreateBlendState( blendStateDesc );
	HELIUM_ASSERT( m_blendStates[BLEND_STATE_MODULATE] );

	// Create the standard depth/stencil states.
	RDepthStencilState::Description depthStateDesc;

	depthStateDesc.stencilWriteMask = 0;
	depthStateDesc.bStencilTestEnable = false;

	depthStateDesc.depthFunction = RENDERER_COMPARE_FUNCTION_LESS_EQUAL;
	depthStateDesc.bDepthTestEnable = true;
	depthStateDesc.bDepthWriteEnable = true;
	m_depthStencilStates[DEPTH_STENCIL_STATE_DEFAULT] = pRenderer->CreateDepthStencilState( depthStateDesc );
	HELIUM_ASSERT( m_depthStencilStates[DEPTH_STENCIL_STATE_DEFAULT] );

	depthStateDesc.bDepthWriteEnable = false;
	m_depthStencilStates[DEPTH_STENCIL_STATE_TEST_ONLY] = pRenderer->CreateDepthStencilState( depthStateDesc );
	HELIUM_ASSERT( m_depthStencilStates[DEPTH_STENCIL_STATE_TEST_ONLY] );

	depthStateDesc.bDepthTestEnable = false;
	m_depthStencilStates[DEPTH_STENCIL_STATE_NONE] = pRenderer->CreateDepthStencilState( depthStateDesc );
	HELIUM_ASSERT( m_depthStencilStates[DEPTH_STENCIL_STATE_NONE] );

	// Create the standard sampler states that are not dependent on configuration settings.
	RSamplerState::Description samplerStateDesc;
	samplerStateDesc.filter = RENDERER_TEXTURE_FILTER_MIN_POINT_MAG_POINT_MIP_POINT;
	samplerStateDesc.addressModeW = RENDERER_TEXTURE_ADDRESS_MODE_CLAMP;
	samplerStateDesc.mipLodBias = 0;
	samplerStateDesc.maxAnisotropy = spGraphicsConfig->GetMaxAnisotropy();

	for ( size_t addressModeIndex = 0; addressModeIndex < RENDERER_TEXTURE_ADDRESS_MODE_MAX; ++addressModeIndex )
	{
		ERendererTextureAddressMode addressMode = static_cast<ERendererTextureAddressMode>( addressModeIndex );
		samplerStateDesc.addressModeU = addressMode;
		samplerStateDesc.addressModeV = addressMode;
		samplerStateDesc.addressModeW = addressMode;

		m_samplerStates[TEXTURE_FILTER_POINT][addressModeIndex] = pRenderer->CreateSamplerState( samplerStateDesc );
		HELIUM_ASSERT( m_samplerStates[TEXTURE_FILTER_POINT][addressModeIndex] );
	}

	// Create the standard set of mesh vertex descriptions.
	RVertexDescription::Element vertexElements[6];

	vertexElements[0].type = RENDERER_VERTEX_DATA_TYPE_FLOAT32_3;
	vertexElements[0].semantic = RENDERER_VERTEX_SEMANTIC_POSITION;
	vertexElements[0].semanticIndex = 0;
	vertexElements[0].bufferIndex = 0;

	vertexElements[1].type = RENDERER_VERTEX_DATA_TYPE_UINT8_4_NORM;
	vertexElements[1].semantic = RENDERER_VERTEX_SEMANTIC_COLOR;
	vertexElements[1].semanticIndex = 0;
	vertexElements[1].bufferIndex = 0;

	vertexElements[2].type = RENDERER_VERTEX_DATA_TYPE_FLOAT16_2;
	vertexElements[2].semantic = RENDERER_VERTEX_SEMANTIC_TEXCOORD;
	vertexElements[2].semanticIndex = 0;
	vertexElements[2].bufferIndex = 0;

	vertexElements[3].type = RENDERER_VERTEX_DATA_TYPE_FLOAT32_2;
	vertexElements[3].semantic = RENDERER_VERTEX_SEMANTIC_TEXCOORD;
	vertexElements[3].semanticIndex = 1;
	vertexElements[3].bufferIndex = 0;

	m_spSimpleVertexDescription = pRenderer->CreateVertexDescription( vertexElements, 2 );
	HELIUM_ASSERT( m_spSimpleVertexDescription );

	m_spSimpleTexturedVertexDescription = pRenderer->CreateVertexDescription( vertexElements, 3 );
	HELIUM_ASSERT( m_spSimpleTexturedVertexDescription );

	m_spProjectedVertexDescription = pRenderer->CreateVertexDescription( vertexElements, 4 );
	HELIUM_ASSERT( m_spProjectedVertexDescription );

	vertexElements[1].type = RENDERER_VERTEX_DATA_TYPE_UINT8_4_NORM;
	vertexElements[1].semantic = RENDERER_VERTEX_SEMANTIC_NORMAL;
	vertexElements[1].semanticIndex = 0;
	vertexElements[1].bufferIndex = 0;

	vertexElements[2].type = RENDERER_VERTEX_DATA_TYPE_UINT8_4_NORM;
	vertexElements[2].semantic = RENDERER_VERTEX_SEMANTIC_TANGENT;
	vertexElements[2].semanticIndex = 0;
	vertexElements[2].bufferIndex = 0;

	vertexElements[3].type = RENDERER_VERTEX_DATA_TYPE_UINT8_4_NORM;
	vertexElements[3].semantic = RENDERER_VERTEX_SEMANTIC_COLOR;
	vertexElements[3].semanticIndex = 0;
	vertexElements[3].bufferIndex = 0;

	vertexElements[4].type = RENDERER_VERTEX_DATA_TYPE_FLOAT16_2;
	vertexElements[4].semantic = RENDERER_VERTEX_SEMANTIC_TEXCOORD;
	vertexElements[4].semanticIndex = 0;
	vertexElements[4].bufferIndex = 0;

	vertexElements[5].type = RENDERER_VERTEX_DATA_TYPE_FLOAT16_2;
	vertexElements[5].semantic = RENDERER_VERTEX_SEMANTIC_TEXCOORD;
	vertexElements[5].semanticIndex = 1;
	vertexElements[5].bufferIndex = 0;

	m_staticMeshVertexDescriptions[0] = pRenderer->CreateVertexDescription( vertexElements, 5 );
	HELIUM_ASSERT( m_staticMeshVertexDescriptions[0] );

	m_staticMeshVertexDescriptions[1] = pRenderer->CreateVertexDescription( vertexElements, 6 );
	HELIUM_ASSERT( m_staticMeshVertexDescriptions[1] );

	vertexElements[1].type = RENDERER_VERTEX_DATA_TYPE_UINT8_4_NORM;
	vertexElements[1].semantic = RENDERER_VERTEX_SEMANTIC_BLENDWEIGHT;
	vertexElements[1].semanticIndex = 0;
	vertexElements[1].bufferIndex = 0;

	vertexElements[2].type = RENDERER_VERTEX_DATA_TYPE_UINT8_4;
	vertexElements[2].semantic = RENDERER_VERTEX_SEMANTIC_BLENDINDICES;
	vertexElements[2].semanticIndex = 0;
	vertexElements[2].bufferIndex = 0;

	vertexElements[3].type = RENDERER_VERTEX_DATA_TYPE_UINT8_4_NORM;
	vertexElements[3].semantic = RENDERER_VERTEX_SEMANTIC_NORMAL;
	vertexElements[3].semanticIndex = 0;
	vertexElements[3].bufferIndex = 0;

	vertexElements[4].type = RENDERER_VERTEX_DATA_TYPE_UINT8_4_NORM;
	vertexElements[4].semantic = RENDERER_VERTEX_SEMANTIC_TANGENT;
	vertexElements[4].semanticIndex = 0;
	vertexElements[4].bufferIndex = 0;

	vertexElements[5].type = RENDERER_VERTEX_DATA_TYPE_FLOAT16_2;
	vertexElements[5].semantic = RENDERER_VERTEX_SEMANTIC_TEXCOORD;
	vertexElements[5].semanticIndex = 0;
	vertexElements[5].bufferIndex = 0;

	m_spSkinnedMeshVertexDescription = pRenderer->CreateVertexDescription( vertexElements, 6 );
	HELIUM_ASSERT( m_spSkinnedMeshVertexDescription );

	vertexElements[0].type = RENDERER_VERTEX_DATA_TYPE_FLOAT32_2;
	vertexElements[0].semantic = RENDERER_VERTEX_SEMANTIC_POSITION;
	vertexElements[0].semanticIndex = 0;
	vertexElements[0].bufferIndex = 0;

	vertexElements[1].type = RENDERER_VERTEX_DATA_TYPE_UINT8_4_NORM;
	vertexElements[1].semantic = RENDERER_VERTEX_SEMANTIC_COLOR;
	vertexElements[1].semanticIndex = 0;
	vertexElements[1].bufferIndex = 0;

	vertexElements[2].type = RENDERER_VERTEX_DATA_TYPE_FLOAT16_2;
	vertexElements[2].semantic = RENDERER_VERTEX_SEMANTIC_TEXCOORD;
	vertexElements[2].semanticIndex = 0;
	vertexElements[2].bufferIndex = 0;

	m_spScreenVertexDescription = pRenderer->CreateVertexDescription( vertexElements, 3 );
	HELIUM_ASSERT( m_spScreenVertexDescription );

	// Create configuration-dependent render resources.
	PostConfigUpdate();

	// Attempt to load the depth-only pre-pass shader.
	// TODO: XXX TMC: Migrate to a more data-driven solution.
	AssetLoader* pAssetLoader = AssetLoader::GetInstance();
	HELIUM_ASSERT( pAssetLoader );

#ifdef HELIUM_DIRECT3D

	AssetPath prePassShaderPath;
	HELIUM_VERIFY( prePassShaderPath.Set( HELIUM_PACKAGE_PATH_CHAR_STRING "Shaders" HELIUM_OBJECT_PATH_CHAR_STRING "PrePass.hlsl" ) );

	AssetPtr spPrePassShader;
	HELIUM_VERIFY( pAssetLoader->LoadObject( prePassShaderPath, spPrePassShader ) );

	Shader* pPrePassShader = Reflect::SafeCast< Shader >( spPrePassShader.Get() );
	if ( HELIUM_VERIFY( pPrePassShader ) )
	{
		size_t loadId = pPrePassShader->BeginLoadVariant( RShader::TYPE_VERTEX, 0 );
		HELIUM_ASSERT( IsValid( loadId ) );
		if ( IsValid( loadId ) )
		{
			while ( !pPrePassShader->TryFinishLoadVariant( loadId, m_spPrePassVertexShader ) )
			{
				pAssetLoader->Tick();
			}
		}
	}

	// Attempt to load the simple world-space, simple screen-space, and screen-space text shaders.
	// TODO: XXX TMC: Migrate to a more data-driven solution.
	AssetPath shaderPath;
	HELIUM_VERIFY( shaderPath.Set( HELIUM_PACKAGE_PATH_CHAR_STRING "Shaders" HELIUM_OBJECT_PATH_CHAR_STRING "Simple.hlsl" ) );

	AssetPtr spShader;
	HELIUM_VERIFY( pAssetLoader->LoadObject( shaderPath, spShader ) );

	Shader* pShader = Reflect::SafeCast< Shader >( spShader.Get() );
	if ( HELIUM_VERIFY( pShader ) )
	{
		size_t loadId = pShader->BeginLoadVariant( RShader::TYPE_VERTEX, 0 );
		HELIUM_ASSERT( IsValid( loadId ) );
		if ( IsValid( loadId ) )
		{
			while ( !pShader->TryFinishLoadVariant( loadId, m_spSimpleWorldSpaceVertexShader ) )
			{
				pAssetLoader->Tick();
			}
		}

		loadId = pShader->BeginLoadVariant( RShader::TYPE_PIXEL, 0 );
		HELIUM_ASSERT( IsValid( loadId ) );
		if ( IsValid( loadId ) )
		{
			while ( !pShader->TryFinishLoadVariant( loadId, m_spSimpleWorldSpacePixelShader ) )
			{
				pAssetLoader->Tick();
			}
		}
	}

	HELIUM_VERIFY( shaderPath.Set( HELIUM_PACKAGE_PATH_CHAR_STRING "Shaders" HELIUM_OBJECT_PATH_CHAR_STRING "ScreenSpaceTexture.hlsl" ) );
	HELIUM_VERIFY( pAssetLoader->LoadObject( shaderPath, spShader ) );
	pShader = Reflect::SafeCast< Shader >( spShader.Get() );
	if ( HELIUM_VERIFY( pShader ) )
	{
		size_t loadId = pShader->BeginLoadVariant( RShader::TYPE_VERTEX, 0 );
		HELIUM_ASSERT( IsValid( loadId ) );
		if ( IsValid( loadId ) )
		{
			while ( !pShader->TryFinishLoadVariant( loadId, m_spSimpleScreenSpaceVertexShader ) )
			{
				pAssetLoader->Tick();
			}
		}

		loadId = pShader->BeginLoadVariant( RShader::TYPE_PIXEL, 0 );
		HELIUM_ASSERT( IsValid( loadId ) );
		if ( IsValid( loadId ) )
		{
			while ( !pShader->TryFinishLoadVariant( loadId, m_spSimpleScreenSpacePixelShader ) )
			{
				pAssetLoader->Tick();
			}
		}
	}

	HELIUM_VERIFY( shaderPath.Set( HELIUM_PACKAGE_PATH_CHAR_STRING "Shaders" HELIUM_OBJECT_PATH_CHAR_STRING "ScreenText.hlsl" ) );
	HELIUM_VERIFY( pAssetLoader->LoadObject( shaderPath, spShader ) );
	pShader = Reflect::SafeCast< Shader >( spShader.Get() );
	if ( HELIUM_VERIFY( pShader ) )
	{
		size_t loadId = pShader->BeginLoadVariant( RShader::TYPE_VERTEX, 0 );
		HELIUM_ASSERT( IsValid( loadId ) );
		if ( IsValid( loadId ) )
		{
			while ( !pShader->TryFinishLoadVariant( loadId, m_spScreenTextVertexShader ) )
			{
				pAssetLoader->Tick();
			}
		}

		loadId = pShader->BeginLoadVariant( RShader::TYPE_PIXEL, 0 );
		HELIUM_ASSERT( IsValid( loadId ) );
		if ( IsValid( loadId ) )
		{
			while ( !pShader->TryFinishLoadVariant( loadId, m_spScreenTextPixelShader ) )
			{
				pAssetLoader->Tick();
			}
		}
	}

	// Attempt to load the debug fonts.
	// TODO: XXX TMC: Migrate to a more data-driven solution.
	AssetPath fontPath;
	AssetPtr spFont;

	HELIUM_VERIFY( fontPath.Set( HELIUM_PACKAGE_PATH_CHAR_STRING "Fonts" HELIUM_OBJECT_PATH_CHAR_STRING "DebugSmall" ) );
	HELIUM_VERIFY( pAssetLoader->LoadObject( fontPath, spFont ) );
	m_debugFonts[DEBUG_FONT_SIZE_SMALL] = Reflect::SafeCast< Font >( spFont.Get() );
	spFont.Release();

	HELIUM_VERIFY( fontPath.Set( HELIUM_PACKAGE_PATH_CHAR_STRING "Fonts" HELIUM_OBJECT_PATH_CHAR_STRING "DebugMedium" ) );
	HELIUM_VERIFY( pAssetLoader->LoadObject( fontPath, spFont ) );
	m_debugFonts[DEBUG_FONT_SIZE_MEDIUM] = Reflect::SafeCast< Font >( spFont.Get() );
	spFont.Release();

	HELIUM_VERIFY( fontPath.Set( HELIUM_PACKAGE_PATH_CHAR_STRING "Fonts" HELIUM_OBJECT_PATH_CHAR_STRING "DebugLarge" ) );
	HELIUM_VERIFY( pAssetLoader->LoadObject( fontPath, spFont ) );
	m_debugFonts[DEBUG_FONT_SIZE_LARGE] = Reflect::SafeCast< Font >( spFont.Get() );
	spFont.Release();

#endif

	return true;
}