// include the basic windows header files and the Direct3D header files
#include <windows.h>
#include <windowsx.h>
#include <d3d11.h>
#include <d3dx11.h>
#include <d3dx10.h>

// include the Direct3D Library file
#pragma comment (lib, "d3d11.lib")
#pragma comment (lib, "d3dx11.lib")
#pragma comment (lib, "d3dx10.lib")

// define the screen resolution
#define SCREEN_WIDTH  800
#define SCREEN_HEIGHT 600

        int m_vertexCount, m_indexCount;
        int m_terrainWidth=100, m_terrainHeight=100;

// global declarations
IDXGISwapChain *swapchain;              // the pointer to the swap chain interface
ID3D11Device *dev;                      // the pointer to our Direct3D device interface
ID3D11DeviceContext *devcon;            // the pointer to our Direct3D device context
ID3D11RenderTargetView *backbuffer;    // the pointer to our back buffer
ID3D11DepthStencilView *zbuffer;        // the pointer to our depth buffer
ID3D11InputLayout *pLayout;            // the pointer to the input layout
ID3D11VertexShader *pVS;                // the pointer to the vertex shader
ID3D11PixelShader *pPS;                // the pointer to the pixel shader
ID3D11Buffer *pVBuffer;                // the pointer to the vertex buffer
ID3D11Buffer *pIBuffer;                // the pointer to the index buffer


// a struct to define a single vertex
        struct VertexType
        {
                D3DXVECTOR3 position;
                D3DXVECTOR4 color;
        };


// function prototypes
void InitD3D(HWND hWnd);    // sets up and initializes Direct3D
void RenderFrame(void);         // renders a single frame
void CleanD3D(void);        // closes Direct3D and releases memory
void InitGraphics(void);    // creates the shape to render
void InitPipeline(void);    // loads and prepares the shaders