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Full screen Query

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All,
I've been playing about with some directX tutorials and have a query regarding fullscreen. In windowed mode my app displays a blue background, however when switched to fullscreen the background is black. Could anyone point me to the reason why?

Thanks


// include the basic windows header files and the Direct3D header file
#include <windows.h>
#include <windowsx.h>
#include <d3d9.h>

// include the Direct3D Library file
#pragma comment (lib, "d3d9.lib")

//global variables
bool bFullScreen = false;

// global declarations
LPDIRECT3D9 d3d; // the pointer to our Direct3D interface
LPDIRECT3DDEVICE9 d3ddev; // the pointer to the device class

// function prototypes
bool initD3D(HWND hWnd); // sets up and initializes Direct3D
void render_frame(void); // renders a single frame
void cleanD3D(void); // closes Direct3D and releases memory

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


// the entry point for any Windows program
int WINAPI WinMain(HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPSTR lpCmdLine,
int nCmdShow)
{
// put up a messagebox requesting the user to chose between a
// fullscreen or windowed application
if (MessageBox(NULL, L"Would you like fullscreen?", L"INFORMATION", MB_YESNO) == IDYES)
{
// we set a bool to true if the user wants fullscreen
bFullScreen = true;
}

HWND hWnd;
WNDCLASSEX wc;

ZeroMemory(&wc, sizeof(WNDCLASSEX));

wc.cbSize = sizeof(WNDCLASSEX);
wc.style = CS_HREDRAW | CS_VREDRAW;
wc.lpfnWndProc = WindowProc;
wc.hInstance = hInstance;
wc.hCursor = LoadCursor(NULL, IDC_ARROW);
wc.hbrBackground = (HBRUSH)COLOR_WINDOW;
wc.lpszClassName = L"WindowClass";

RegisterClassEx(&wc);

hWnd = CreateWindowEx(NULL,
L"WindowClass",
L"Fullscreen Choice",
WS_OVERLAPPEDWINDOW,
300, 300,
800, 600,
NULL,
NULL,
hInstance,
NULL);

ShowWindow(hWnd, nCmdShow);

// set up and initialize Direct3D
initD3D(hWnd);

// enter the main loop:

MSG msg;

while(TRUE)
{
while(PeekMessage(&msg, NULL, 0, 0, PM_REMOVE))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}

if(msg.message == WM_QUIT)
break;

render_frame();
}

// clean up DirectX and COM
cleanD3D();

return msg.wParam;
}


// this is the main message handler for the program
LRESULT CALLBACK WindowProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
switch(message)
{
case WM_KEYUP:
if(wParam == VK_ESCAPE)
PostQuitMessage(0);
break;

case WM_DESTROY:
{
PostQuitMessage(0);
return 0;
} break;
}

return DefWindowProc (hWnd, message, wParam, lParam);
}


// this function initializes and prepares Direct3D for use
bool initD3D(HWND hWnd)
{
d3d = Direct3DCreate9(D3D_SDK_VERSION); // create the Direct3D interface

D3DDISPLAYMODE DisplayMode; // This object will allow us to set the display mode of the screen.

D3DPRESENT_PARAMETERS d3dpp; // create a struct to hold various device information

D3DCAPS9 D3DCaps; // Get capabilities of the hardware

ZeroMemory(&d3dpp, sizeof(d3dpp)); // clear out the struct for use

// Error checking. Make sure that it was successful.
if(d3d == NULL)
{
MessageBox(NULL, L"Error, couldn't initialize DirectX!?!",
L"Error!", MB_OK);
return false;
}

// This function will get the display mode of the device and place it in DisplayMode.
if(FAILED(d3d->GetAdapterDisplayMode(D3DADAPTER_DEFAULT, &DisplayMode)))
{
MessageBox(NULL, L"Error setting the display mode.", L"Error!", MB_OK);
return false;
}

// Get the capabilities of the hardware.
if(FAILED(d3d->GetDeviceCaps(D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL, &D3DCaps)))
{
return false;
}

// Test which is supported, hardware or software vertex processing.
DWORD VertexProcessing = 0;

if(D3DCaps.VertexProcessingCaps != 0)
VertexProcessing |= D3DCREATE_HARDWARE_VERTEXPROCESSING;
else
VertexProcessing |= D3DCREATE_SOFTWARE_VERTEXPROCESSING;

if(bFullScreen)
{
d3dpp.Windowed = FALSE;
d3dpp.BackBufferWidth = 800;
d3dpp.BackBufferHeight = 600;
d3dpp.BackBufferFormat = DisplayMode.Format;// Render to the area of the screen.
d3dpp.SwapEffect = D3DSWAPEFFECT_DISCARD; // discard old frames
d3dpp.hDeviceWindow = hWnd; // set the window to be used by Direct3D

}
else

d3dpp.Windowed = TRUE; // program windowed, not fullscreen
d3dpp.SwapEffect = D3DSWAPEFFECT_DISCARD; // discard old frames
d3dpp.BackBufferFormat = DisplayMode.Format;// Render to the area of the screen.
d3dpp.hDeviceWindow = hWnd; // set the window to be used by Direct3D


// create a device class using this information and the info from the d3dpp stuct
d3d->CreateDevice(D3DADAPTER_DEFAULT,
D3DDEVTYPE_HAL,
hWnd,
VertexProcessing,
&d3dpp,
&d3ddev);
}


// this is the function used to render a single frame
void render_frame(void)
{
// clear the window to a deep blue
d3ddev->Clear(0, NULL, D3DCLEAR_TARGET, D3DCOLOR_XRGB(0, 40, 100), 1.0f, 0);

d3ddev->BeginScene(); // begins the 3D scene

// do 3D rendering on the back buffer here

d3ddev->EndScene(); // ends the 3D scene

d3ddev->Present(NULL, NULL, NULL, NULL); // displays the created frame on the screen
}


// this is the function that cleans up Direct3D and COM
void cleanD3D(void)
{
d3ddev->Release(); // close and release the 3D device
d3d->Release(); // close and release Direct3D
}

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This is gonna be little help, I'm afraid. Made a project of your code and it goes fullscreen with blue background for me.

I haven't a clue if this will help but I also made a modification to your code to take it actual fullscreen:

// global variables
int nWidth = 800;
int nHeight = 600;
// in your winmain immediately after RegisterClassEx
if( bFullScreen )
{
RECT r;
GetClientRect(GetDesktopWindow(),&r);
nWidth = r.right-r.left;
nHeight = r.bottom-r.top;
}
// note changes to x,y,cx,cy
hWnd = CreateWindowEx(NULL,
"WindowClass",
"Fullscreen Choice",
WS_OVERLAPPEDWINDOW,
0, 0,
nWidth, nHeight,
NULL,
NULL,
hInstance,
NULL);
// in initD3D
// change if(bFullScreen) ..
d3dpp.BackBufferWidth = nWidth;
d3dpp.BackBufferHeight = nHeight;

EDIT:
Also, I think you intended curly brackets around:

else
{
d3dpp.Windowed = TRUE; // program windowed, not fullscreen
d3dpp.SwapEffect = D3DSWAPEFFECT_DISCARD; // discard old frames
d3dpp.BackBufferFormat = DisplayMode.Format;// Render to the area of the screen.
d3dpp.hDeviceWindow = hWnd; // set the window to be used by Direct3D
}

Turns out it doesn't make a difference. Just letting you know.

Does the Debug Runtime tell you anything?

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Buckeye,
Thanks for having a look through my code for me. Your modifications work, and the program does what I expect it to now. Thanks, I can stop pulling my hair out now :).

Still a little puzzled as to why it wouldn't work on my computer yet it would on yours. I've tried 3 or 4 other tutorials for going full screen and they produced the same problem as the code I was using.


if( bFullScreen )
{
RECT r;
GetClientRect(GetDesktopWindow(),&r);
SCREEN_WIDTH = r.right-r.left;
SCREEN_HEIGHT = r.bottom-r.top;
}



Seems this code corrects the fault on my PC.

Thanks again

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