Model<VertexPosNormTanTex>* TerrainLoader::Load(ID3D10Device* pDXDevice, const tstring& key)
{
Model<VertexPosNormTanTex>* ret = 0;
if ( m_pAssets->IsAssetPresent(key))
{
ret = m_pAssets->GetAsset(key);
}
else
{
vector<VertexPosNormTanTex> vertices;
vector<DWORD> indices;
Texture2D* heightMap = Content->LoadTexture2D(key, true);
ID3D10Texture2D* pTex2D = heightMap->GetTextureResource();
vertices.reserve(heightMap->GetWidth() * heightMap->GetHeight());
indices.reserve((heightMap->GetWidth()-1) * (heightMap->GetHeight()-1) * 6);
D3D10_MAPPED_TEXTURE2D pMappedTex2D;
pTex2D->Map(0, D3D10_MAP_READ, 0, &pMappedTex2D);
float heightMult = 1.0f;
float planarMult = 1.0f / max(heightMap->GetWidth(), heightMap->GetHeight());
BYTE* pData = static_cast<BYTE*>(pMappedTex2D.pData);
for (UINT x = 0; x < heightMap->GetHeight(); ++x)
{
for (UINT z = 0; z < heightMap->GetWidth(); ++z)
{
float height = pData[z * 4 + x * pMappedTex2D.RowPitch + 0] / 255.0f; //get red
vertices.push_back(VertexPosNormTanTex(
static_cast<float>(x) * planarMult, height * heightMult, static_cast<float>(z) * planarMult,
0, 0, 0,
0, 0, 0,
static_cast<float>(z) / heightMap->GetWidth(), static_cast<float>(x) / heightMap->GetHeight()));
if (z != heightMap->GetWidth() - 1 && x != heightMap->GetHeight() - 1)
{
indices.push_back(z + x * heightMap->GetWidth());
indices.push_back(z + x * heightMap->GetWidth() + 1);
indices.push_back(z + (x + 1) * heightMap->GetWidth());
indices.push_back(z + x * heightMap->GetWidth() + 1);
indices.push_back(z + (x + 1) * heightMap->GetWidth() + 1);
indices.push_back(z + (x + 1) * heightMap->GetWidth());
}
}
}
pTex2D->Unmap(0);
CalculateNormals(vertices, indices);
CalculateTangents(vertices, indices);
Model<VertexPosNormTanTex>* pModel = new Model<VertexPosNormTanTex>(pDXDevice);
ModelMesh<VertexPosNormTanTex>* pMesh = pModel->AddMesh(_T(""));
pMesh->SetVertices(vertices);
pMesh->SetIndices(indices);
m_pAssets->AddAsset(key, pModel);
ret = pModel;
}
return ret;
}
