Fix culling for shadows and reflections.

Previously we had a single culling frustum based on the main camera, and
any object outside the frustum would never get rendered, even if it
should actually contribute to shadows or reflections/refractions. This
caused ugly pop-in effects in the shadows and reflections while
scrolling.

Extend the renderer to support multiple cull groups, each with a
separate frustum and with separate lists of submitted objects, so that
shadows and reflections will render the correctly culled sets of
objects.

Update the shadow map generation to compute the (hopefully) correct
bounds and matrices for this new scheme.

Include terrain patches in the shadow bounds, so hills can cast shadows
correctly.

Remove the code that tried to render objects slightly outside the camera
frustum in order to reduce the pop-in effect, since that was a
workaround for the lack of a proper fix.

Remove the model/patch filtering code, which was used to cull objects
that were in the normal camera frustum but should be excluded from
reflections/refractions, since that's redundant now too.

Inline DistanceToPlane to save a few hundred usecs per frame inside
CCmpUnitRenderer::RenderSubmit.

Fixes #504, #579.

This was SVN commit r15445.

source/renderer/ModelRenderer.cpp

@@ -215,7 +215,7 @@ struct ShaderModelRendererInternals
 	ModelVertexRendererPtr vertexRenderer;
 
 	/// List of submitted models for rendering in this frame
-	std::vector<CModel*> submissions;
+	std::vector<CModel*> submissions[CRenderer::CULL_MAX];
 };
 
 
@@ -232,7 +232,7 @@ ShaderModelRenderer::~ShaderModelRenderer()
 }
 
 // Submit one model.
-void ShaderModelRenderer::Submit(CModel* model)
+void ShaderModelRenderer::Submit(int cullGroup, CModel* model)
 {
 	CModelDefPtr mdef = model->GetModelDef();
 	CModelRData* rdata = (CModelRData*)model->GetRenderData();
@@ -246,22 +246,27 @@ void ShaderModelRenderer::Submit(CModel* model)
 		model->SetDirty(~0u);
 	}
 
-	m->submissions.push_back(model);
+	m->submissions[cullGroup].push_back(model);
 }
 
 
 // Call update for all submitted models and enter the rendering phase
 void ShaderModelRenderer::PrepareModels()
 {
-	for (size_t i = 0; i < m->submissions.size(); ++i)
+	for (int cullGroup = 0; cullGroup < CRenderer::CULL_MAX; ++cullGroup)
 	{
-		CModel* model = m->submissions[i];
+		for (size_t i = 0; i < m->submissions[cullGroup].size(); ++i)
+		{
+			CModel* model = m->submissions[cullGroup][i];
 
- 		CModelRData* rdata = static_cast<CModelRData*>(model->GetRenderData());
- 		ENSURE(rdata->GetKey() == m->vertexRenderer.get());
+			model->ValidatePosition();
 
-		m->vertexRenderer->UpdateModelData(model, rdata, rdata->m_UpdateFlags);
-		rdata->m_UpdateFlags = 0;
+			CModelRData* rdata = static_cast<CModelRData*>(model->GetRenderData());
+			ENSURE(rdata->GetKey() == m->vertexRenderer.get());
+
+			m->vertexRenderer->UpdateModelData(model, rdata, rdata->m_UpdateFlags);
+			rdata->m_UpdateFlags = 0;
+		}
 	}
 }
 
@@ -269,7 +274,8 @@ void ShaderModelRenderer::PrepareModels()
 // Clear the submissions list
 void ShaderModelRenderer::EndFrame()
 {
-	m->submissions.clear();
+	for (int cullGroup = 0; cullGroup < CRenderer::CULL_MAX; ++cullGroup)
+		m->submissions[cullGroup].clear();
 }
 
 
@@ -358,9 +364,9 @@ struct SMRCompareTechBucket
 	}
 };
 
-void ShaderModelRenderer::Render(const RenderModifierPtr& modifier, const CShaderDefines& context, int flags)
+void ShaderModelRenderer::Render(const RenderModifierPtr& modifier, const CShaderDefines& context, int cullGroup, int flags)
 {
-	if (m->submissions.empty())
+	if (m->submissions[cullGroup].empty())
 		return;
 
 	CMatrix3D worldToCam;
@@ -431,9 +437,9 @@ void ShaderModelRenderer::Render(const RenderModifierPtr& modifier, const CShade
 	{
 		PROFILE3("bucketing by material");
 
-		for (size_t i = 0; i < m->submissions.size(); ++i)
+		for (size_t i = 0; i < m->submissions[cullGroup].size(); ++i)
 		{
-			CModel* model = m->submissions[i];
+			CModel* model = m->submissions[cullGroup][i];
 
 			uint32_t condFlags = 0;
 
@@ -770,19 +776,3 @@ void ShaderModelRenderer::Render(const RenderModifierPtr& modifier, const CShade
 		}
 	}
 }
-
-void ShaderModelRenderer::Filter(CModelFilter& filter, int passed, int flags)
-{
-	for (size_t i = 0; i < m->submissions.size(); ++i)
-	{
-		CModel* model = m->submissions[i];
-
-		if (flags && !(model->GetFlags() & flags))
-			continue;
-
-		if (filter.Filter(model))
-			model->SetFlags(model->GetFlags() | passed);
-		else
-			model->SetFlags(model->GetFlags() & ~passed);
-	}
-}