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CryAnimation/CryCharReShadowVolume.h

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+/////////////////////////////////////////////////////////////////////////////////////////////////////
+//
+//	Crytek Character Animation source code
+//	
+//	History:
+//	Created 12/05/2002 by Sergiy Migdalskiy
+//
+//  This is the class that's used by the model state (or cry char instance)
+//  to render the shadow volumes. Generally, it's former part of the CryModelState
+/////////////////////////////////////////////////////////////////////////////////////////////////////
+
+#ifndef _CRY_CHAR_RE_SHADOW_VOLUME_HDR_
+#define _CRY_CHAR_RE_SHADOW_VOLUME_HDR_
+
+// This is the utility/helper class for rendering the shadow volumes,
+// all the dirty work (of double buffering and managing the memory)
+// should be in this class
+//
+// USAGE:
+// 1. get the vertex and index buffers and fill them in by the declared
+//    number of vertices and indices referring to them
+// 2. submit that with submit() function that will create the renderer object and
+//    update the buffers and do everything required.
+//
+// This sequence is to be done once and only once per frame per light per character
+class CryCharReShadowVolume
+{
+public:
+	CryCharReShadowVolume();
+	~CryCharReShadowVolume();
+
+	void clear();
+
+	// prepares for calculating the shadow volume	
+	// numVertices is the minimal length of the vertex buffer
+	// numIndices is the minimal length of the index buffer
+	void prepare (unsigned numIndices, unsigned numVertices);
+	
+	// returns the pointer to the array of vertices to fill in
+	// the vertices are used to form the shadow volume mesh/geometry
+	Vec3d* getVertexBuffer () {return &m_arrVertices[0];}
+
+	// returns the pointer to the indices in the index buffer to fill in
+	// the indices refer to the vertices in the vertex buffer returned by getVertexBuffer ()
+	unsigned short* getIndexBuffer () {return &m_arrIndices[0];}
+
+	// assuming the calculation of the shadow volume is finished, submits it to the renderer
+	void submit (const SRendParams *rParams, IShader* pShadowCull );
+
+	// returns the age of this shadow volume: the current frame - the frame it was submitted last
+	unsigned getAgeFrames();
+
+	// returns the timeout from the last call to submit()
+	float getAgeSeconds();
+
+	void GetMemoryUsage (ICrySizer* pSizer);
+protected:
+	unsigned numMeshIndices() {return m_nUsedMeshVertices;}
+	unsigned numMeshVertices() {return m_pLeafBuffer->m_SecVertCount;}
+
+protected:
+	//! shadow volume renderer managed vertex buffer
+	CLeafBuffer* m_pLeafBuffer;
+
+	// this is the number of vertices actually used in the leaf buffer
+	// (referred to by the index array)
+	unsigned m_nUsedMeshVertices;
+
+	//! Shader RenderElements for stencil
+	CRETriMeshShadow* m_pMesh;
+
+	//! shadow volume indices
+	TFixedArray<unsigned short> m_arrIndices;
+
+	//! shadow volume memory vertex buffer
+	//! TODO: get rid of it; rewrite the shadow code so that we don't keep it in every character
+	TFixedArray<Vec3d> m_arrVertices;
+
+	// the synchronous time when the last submit() was called
+	float m_fLastTimeSubmitted;
+	
+	// the last frame submit() function was called
+	int m_nLastFrameSubmitted;
+};
+
+#endif