Terrain.cpp
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	#include <echo/Graphics/Terrain.h>
	#include <echo/Graphics/Mesh.h>
	#include <echo/Graphics/SubMesh.h>
	#include <echo/Resource/MeshManager.h>
	#include <echo/Resource/TextureManager.h>

	namespace Echo
	{

	Terrain::Terrain(const std::string& terrainName, MeshManager& meshManager, TextureManager& textureManager) :
	mMeshManager(meshManager),
	mTextureManager(textureManager),
	mMeshOutOfDate(true),
	mPixelMode(PixelModes::PIXEL_IS_VERTEX),
	mResolution(10,10,0.1)
	{
	SetMesh(meshManager.CreateMesh(terrainName));
	}

	Terrain::~Terrain()
	{

	}

	void Terrain::SetTexture(const std::string& textureName)
	{
	mTexture = mTextureManager.GetResource(textureName);
	mMeshOutOfDate=true;
	}

	void Terrain::SetPixelMode(PixelMode pixelMode)
	{
	mPixelMode=pixelMode;
	mMeshOutOfDate=true;
	}

	void Terrain::SetResolution(const Vector3& resolution)
	{
	mResolution=resolution;
	mMeshOutOfDate=true;
	}

	void Terrain::UpdateMesh()
	{
	if(!mTexture)
	{
	ECHO_LOG_ERROR("Null texture.");
	return;
	}

	Texture::Format format = mTexture->GetFormat();
	if(format!=Texture::Formats::R8G8B8A8)
	{
	ECHO_LOG_ERROR("Texture format not supported. Must be R8G8B8A8.");
	return;
	}
	switch(mPixelMode)
	{
	case PixelModes::PIXEL_IS_QUAD:
	BuildQuadMesh();
	break;
	case PixelModes::PIXEL_IS_VERTEX:
	default:
	BuildVertexMesh();
	break;
	}
	mMeshOutOfDate=false;
	}

	void Terrain::Render(RenderContext& renderContext, Colour compoundDiffuse)
	{
	if(mMeshOutOfDate)
	{
	UpdateMesh();
	}
	SceneEntity::Render(renderContext,compoundDiffuse);
	}

	void Terrain::BuildVertexMesh()
	{
	shared_ptr<Mesh> mesh = GetMesh();
	mesh->Clear();

	u32 width = mTexture->GetWidth();
	u32 height = mTexture->GetHeight();
	shared_ptr<u8> buffer = mTexture->GetBuffer();
	u32* pixelBuffer = reinterpret_cast<u32*>(buffer.get());
	shared_ptr<SubMesh> subMesh = mesh->CreateCommonSubMesh();
	shared_ptr<VertexBuffer> vertexbuffer = subMesh->GetVertexBuffer();
	vertexbuffer->Allocate(height*width);
	VertexBuffer::Accessor<Vector3> vertices = vertexbuffer->GetAccessor<Vector3>("Position");
	VertexBuffer::Accessor<Vector3> normals = vertexbuffer->GetAccessor<Vector3>("Normal");
	VertexBuffer::Accessor<VertexColour> colours = vertexbuffer->GetAccessor<VertexColour>("Colour");
	VertexBuffer::Accessor<TextureUV> uv0 = vertexbuffer->GetAccessor<TextureUV>("UV0");

	Size numberOfElements = (height-1)(width-1)2;
	subMesh->SetElementBuffer(ElementBuffer::Types::STATIC, ElementBuffer::IndexTypes::UNSIGNED_16BIT, ElementBuffer::ElementTypes::TRIANGLE, numberOfElements);
	shared_ptr<ElementBuffer> elementBuffer=subMesh->GetElementBuffer();
	auto triangles = elementBuffer->GetAccessor< ElementBuffer::Triangle<u16> >();
	Size triangleIndex = 0;

	Size numVertices = 0;
	//Build the vertices
	for(u32 py=0; py<height;++py)
	{
	for(u32 px=0; px<width;++px)
	{
	u32 pixel = pixelBuffer[px + py*width];
	u32 depth = (pixel&0xFF000000) >> 24;
	Vector3 position;
	position.x = px * mResolution.x;
	position.y = depth * mResolution.z;
	position.z = py * mResolution.y;

	f32 u=static_cast<f32>(px)/static_cast<f32>(width);
	f32 v=static_cast<f32>(py)/static_cast<f32>(height);
	vertices[numVertices] = position;
	normals[numVertices] = Vector3(0,position.y,0);
	colours[numVertices] = Colours::WHITE;
	uv0[numVertices] = TextureUV(u,v);
	++numVertices;
	}
	}
	//Build the triangles
	for(u32 py=0; py<height-1;++py)
	{
	for(u32 px=0; px<width-1;++px)
	{
	u16 x=px + py*width;
	u16 nextX=x+1;

	u16 y=px + (py+1)*width;
	u16 nextY=y+1;

	ElementBuffer::Triangle<u16>& triangle1 = triangles[triangleIndex++];
	triangle1.mA=y;
	triangle1.mB=nextX;
	triangle1.mC=x;

	ElementBuffer::Triangle<u16>& triangle2 = triangles[triangleIndex++];
	triangle2.mA=y;
	triangle2.mB=nextY;
	triangle2.mC=nextX;
	}
	}
	mesh->CentreMeshToOrigin();
	subMesh->Finalise();
	}

	void Terrain::BuildQuadMesh()
	{
	ECHO_LOG_ERROR("Not implemented.");
	}
	}

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