BulletMeshDebugDrawer.h
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BulletMeshDebugDrawer.h
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	#ifndef _ECHOBULLETMESHDEBUGDRAWER_H_
	#define _ECHOBULLETMESHDEBUGDRAWER_H_

	#include <LinearMath/btIDebugDraw.h>
	#include <echo/Graphics/Mesh.h>
	#include <echo/Kernel/Mutex.h>

	namespace Echo
	{
	/**
	* BulletMeshDebugDrawer will draw lines to a SubMesh which can then be
	* used to render in a Scene.
	* @note The class only draws lines. Points are not supported.
	* @note The class clears after every render so if you have multiple viewports you will only see the debug information in the first one.
	* @
	*/
	class BulletMeshDebugDrawer : public btIDebugDraw, public Mesh
	{
	public:
	BulletMeshDebugDrawer();
	~BulletMeshDebugDrawer();

	/**
	* Draw a line.
	* Override from btIDebugDraw.
	*/
	virtual void drawLine(const btVector3& from,const btVector3& to,const btVector3& colour) override;

	/**
	* Drawing contact points is currently unsupported.
	* Override from btIDebugDraw.
	*/
	virtual void drawContactPoint(const btVector3& PointOnB,const btVector3& normalOnB,btScalar distance,int lifeTime,const btVector3& colour) override;

	/**
	* Output a warning to stdout.
	* override from btIDebugDraw.
	* @param warningString.
	*/
	virtual void reportErrorWarning(const char* warningString) override;

	/**
	* Set the debug draw mode.
	* DBG_DrawWireframe \| DBG_DrawAabb is a common combination. See btIDebugDraw for more.
	* @note not all debug information will be displayed with this drawer.
	* override from btIDebugDraw.
	*/
	virtual void setDebugMode(int debugMode) override;

	/**
	* Get the debug draw mode.
	* override from btIDebugDraw.
	* @return
	*/
	virtual int getDebugMode() const override;

	/**
	* Drawing 3D text is currently unsupported.
	* override from btIDebugDraw.
	*/
	virtual void draw3dText(const btVector3& location,const char* textString) override;

	/**
	* Mesh Render override.
	* Clears the mesh data after rendering.
	*/
	virtual void Render(RenderContext& renderContext, const Matrix4& world, const Matrix4& worldView, Colour compoundDiffuse) override;

	/**
	* Lock the object to prevent it from rendering.
	* If you're using different threads for rendering and debug drawing you should lock before debug drawing and unlock when you're done.
	*/
	void Lock();

	/**
	* Unlock the object to allow it to render.
	* If you're using different threads for rendering and debug drawing you should lock before debug drawing and unlock when you're done.
	*/
	void Unlock();
	private:
	int mDebugMode;
	Size mNumberOfVertices;
	Size mNumberOfLines;
	bool mJustRendered;
	shared_ptr<SubMesh> mSubMesh;
	shared_ptr<VertexBuffer> mVertexBuffer;
	VertexBuffer::Accessor<Vector3> mVertices;
	VertexBuffer::Accessor<VertexColour> mColours;
	shared_ptr< ElementBuffer > mElementBuffer;
	ElementBuffer::Accessor< ElementBuffer::Line< u32 > > mLines;
	Mutex mMutex;
	};
	}
	#endif

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