cterrain.cpp

HeightMap_D3D

//-----------------------------------------------------------------------------
// File: cTerrain.cpp
// Desc: Loading and setting the terrain here from a heightMap using brute
//		 force.
//-----------------------------------------------------------------------------
#include "Main.h"
#include "cTerrain.h"




//-----------------------------------------------------------------------------
// Func: cTerrain()
// Desc: Constructor of our cTerrain Class.
//-----------------------------------------------------------------------------
cTerrain::cTerrain()
{
	m_pVB = NULL;
	SetVertexBuffer();
}




//-----------------------------------------------------------------------------
// Func: SetVertexBuffer()
// Desc: Creating And Setting Vertices and Vertex Buffer Here. 
//-----------------------------------------------------------------------------
HRESULT cTerrain::SetVertexBuffer()
{
	static CUSTOMVERTEX pVertices[(TERRAIN_X - 1) * (TERRAIN_Y - 1) * 6];
	unsigned char pHeightMap[TERRAIN_X][TERRAIN_Y];
	ifstream File;

	File.open("heightmap.raw",ios::binary);
	for(int j = 0; j < TERRAIN_Y; j++ )
	{
		for(int i = 0; i < TERRAIN_X; i++ )
		{
			File.get(pHeightMap[i][j]);
		}
	}
	File.close();

	int VertexCount = 0;
	for(int y = 0; y < TERRAIN_Y - 1; y++ )
	{
		for(int x = 0;x < TERRAIN_X - 1; x++ )
		{
			pVertices[VertexCount].Point = D3DXVECTOR3( (float)x, (float)y, (float)pHeightMap[x][y] / HAX_HEIGHT );
			pVertices[VertexCount + 1].Point = D3DXVECTOR3( (float)x + 1, (float)y, (float)pHeightMap[x + 1][y] / HAX_HEIGHT );
			pVertices[VertexCount + 2].Point = D3DXVECTOR3( (float)x + 1, (float)y + 1, (float)pHeightMap[x + 1][y + 1] / HAX_HEIGHT );
			pVertices[VertexCount + 3].Point = D3DXVECTOR3( (float)x, (float)y, (float)pHeightMap[x][y] / HAX_HEIGHT );
			pVertices[VertexCount + 4].Point = D3DXVECTOR3( (float)x + 1, (float)y  + 1, (float)pHeightMap[x + 1][y + 1] / HAX_HEIGHT );
			pVertices[VertexCount + 5].Point = D3DXVECTOR3( (float)x, (float)y + 1, (float)pHeightMap[x][y + 1] / HAX_HEIGHT );

			VertexCount += 6;
		}
	}

	if( FAILED( g_pApp->m_pD3DDevice->CreateVertexBuffer( sizeof(pVertices), 0, D3DFVF_CUSTOMVERTEX, D3DPOOL_MANAGED, &m_pVB, NULL ) ) )
    {
		MessageBox( hWnd, "CreateVertexBuffer() failed!", "cTerrain::SetVertexBuffer()", MB_OK );
        return E_FAIL;
    }

	VOID* pData;
    if( FAILED( m_pVB->Lock( 0, sizeof(pVertices), (void**)&pData, 0 ) ) )
	{
		MessageBox( hWnd, "Lock() failed!", "cTerrain::SetVertexBuffer()", MB_OK );
        return E_FAIL;
	}
    memcpy( pData, pVertices, sizeof(pVertices) );
    m_pVB->Unlock();

	return S_OK;
}




//-----------------------------------------------------------------------------
// Func: Render()
// Desc: For rendering this object to the screen. 
//-----------------------------------------------------------------------------
HRESULT cTerrain::Render()
{
	if(FAILED(g_pApp->m_pD3DDevice->SetStreamSource( 0, m_pVB, 0, sizeof(CUSTOMVERTEX) )))
	{
		MessageBox( hWnd, "SetStreamSource() failed!", "cTerrain::Render()", MB_OK );
        return E_FAIL;
	}

    g_pApp->m_pD3DDevice->SetFVF( D3DFVF_CUSTOMVERTEX );
    g_pApp->m_pD3DDevice->DrawPrimitive(D3DPT_TRIANGLELIST,0,16129);
	g_pApp->m_pD3DDevice->DrawPrimitive(D3DPT_TRIANGLELIST,48387,16129);
	return S_OK;
}




//-----------------------------------------------------------------------------
// Func: ~cTerrain()
// Desc: Deconstructor for releasing memory.
//-----------------------------------------------------------------------------
cTerrain::~cTerrain()
{
	SafeRelease(m_pVB);
}