Hi there, I've just joined the forum so apologies for starting with what's probably a dumb question, but repeated googleing hasn't supplied an answer. I'm still getting multiple declaration errors as soon as I include the header file in more than one cpp file, despite the ifndef structure. What am I doing wrong?

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#ifndef MOD02
#define MOD02
#define SCREEN_WIDTH 800
#define SCREEN_HEIGHT 600

// 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

// 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
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

// a struct to define a single vertex
struct VERTEX{FLOAT X, Y, Z; D3DXCOLOR 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

// the WindowProc function prototype
LRESULT CALLBACK WindowProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam);

#endif
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A couple of other questions:

How do I open a new shader file in visual studio 2010? I've got by so far by using the file provided in a microcsoft example.

What's the difference between a ".fx" and a ".hlsl" file?

yours gratefully Rich

Quote:Original post by Gage64
The problem are the global variables. This article explains why it's a problem and how to solve it.

BTW, you're defining the screen width and height twice, which is not an error but is unnecessary.

Ah cheers, yes problem solved and a useful article. I noted it says that macro's have been depreciated from C. A good thing in my opinion as their main purpose seemed to be to make a programmer unsackable as they could so easily make code unfollowable.

Does anyone have an answer to my two other questions?