Method RenderShadows

trinity/Interior/Tr2InteriorScene.cpp:683–809

-------------------------------------------------------------------------------------- Description This function renders shadow maps for each shadow casting light source. --------------------------------------------------------------------------------------

//   This function renders shadow maps for each shadow casting light source.
// --------------------------------------------------------------------------------------
void Tr2InteriorScene::RenderShadows( Tr2RenderContext& renderContext )
{
	CCP_STATS_ZONE( __FUNCTION__ );

	if( !m_renderShadows )
	{
		return;
	}

	if( !m_lightDepthStencil )
	{
		SetupShadowMaps();
	}

	m_noiseTextureHandle = GlobalStore().RegisterVariable( "NoiseMap", m_noiseTexture );

	Tr2Renderer::PushProjection();
	ON_BLOCK_EXIT( Tr2Renderer::PopProjection );
	Tr2Renderer::PushViewTransform();
	ON_BLOCK_EXIT( Tr2Renderer::PopViewTransform );

	renderContext.m_esm.PushViewport();
	ON_BLOCK_EXIT( [&] { renderContext.m_esm.PopViewport(); } );
	renderContext.m_esm.PushRenderTarget();
	ON_BLOCK_EXIT( [&] { renderContext.m_esm.PopRenderTarget(); } );
	renderContext.m_esm.PushDepthStencilBuffer( Tr2TextureAL() );
	ON_BLOCK_EXIT( [&] { renderContext.m_esm.PopDepthStencilBuffer(); } );

	TriViewPtr lightView = CreateInstance<TriView>();
	TriProjectionPtr lightProjection = CreateInstance<TriProjection>();

	// This is the camera's frustum, used for calculating tight bounds for shadow maps
	TriFrustum cameraFrustum;
	cameraFrustum.DeriveFrustum(
		&Tr2Renderer::GetViewTransform(),
		&Tr2Renderer::GetViewPosition(),
		&Tr2Renderer::GetProjectionTransform(),
		renderContext.m_esm.GetViewport() );

	// Reset the testures to white
	m_shadowMap0Var = m_whiteTexture;
	m_shadowMap1Var = m_whiteTexture;
	m_shadowMap2Var = m_whiteTexture;
	m_shadowMap3Var = m_whiteTexture;

	for( int i = 0; i < (int)( m_lights.size() ) && i < m_shadowCount; ++i )
	{
		if( i >= (int)( m_lightRenderTargets.size() ) )
		{
			// render target might not be created yet.
			return;
		}

		Tr2InteriorLightSource* light = dynamic_cast<Tr2InteriorLightSource*>( m_lights[i] );

		if( light->m_coneAlphaOuter >= 90 )
		{
			continue;