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AnimatePalette
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animatepalette.cpp
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C/C++ Source or Header
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2001-10-31
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550 lines
//-----------------------------------------------------------------------------
// File: AnimatePalette.cpp
//
// Desc: This sample demonstrates how to do DirectDraw palette animatation
// when in full-screen mode.
//
// Copyright (c) 1999-2001 Microsoft Corporation. All rights reserved.
//-----------------------------------------------------------------------------
#define STRICT
#include <windows.h>
#include <ddraw.h>
#include <mmsystem.h>
#include <dxerr8.h>
#include "resource.h"
#include "ddutil.h"
//-----------------------------------------------------------------------------
// Defines, constants, and global variables
//-----------------------------------------------------------------------------
#define SAFE_DELETE(p) { if(p) { delete (p); (p)=NULL; } }
#define SAFE_RELEASE(p) { if(p) { (p)->Release(); (p)=NULL; } }
#define SCREEN_WIDTH 640
#define SCREEN_HEIGHT 480
#define SCREEN_BPP 8
#define SPRITE_DIAMETER 48
#define NUM_SPRITES 25
#define HELPTEXT TEXT("Press Escape to quit.")
struct SPRITE_STRUCT
{
FLOAT fPosX;
FLOAT fPosY;
FLOAT fVelX;
FLOAT fVelY;
};
CDisplay* g_pDisplay = NULL;
CSurface* g_pLogoSurface = NULL;
CSurface* g_pTextSurface = NULL;
LPDIRECTDRAWPALETTE g_pDDPal = NULL;
PALETTEENTRY g_pe[256];
HWND g_hWnd = NULL;
BOOL g_bActive = FALSE;
DWORD g_dwLastTick;
SPRITE_STRUCT g_Sprite[NUM_SPRITES];
//-----------------------------------------------------------------------------
// Function-prototypes
//-----------------------------------------------------------------------------
LRESULT CALLBACK MainWndProc( HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam );
HRESULT WinInit( HINSTANCE hInst, int nCmdShow, HWND* phWnd, HACCEL* phAccel );
HRESULT InitDirectDraw( HWND hWnd );
VOID FreeDirectDraw();
HRESULT ProcessNextFrame();
VOID UpdateSprite( SPRITE_STRUCT* pSprite, FLOAT fTimeDelta );
HRESULT CyclePalette();
HRESULT DisplayFrame();
HRESULT RestoreSurfaces();
//-----------------------------------------------------------------------------
// Name: WinMain()
// Desc: Entry point to the program. Initializes everything and calls
// UpdateFrame() when idle from the message pump.
//-----------------------------------------------------------------------------
int APIENTRY WinMain( HINSTANCE hInst, HINSTANCE hPrevInst, LPSTR pCmdLine, int nCmdShow )
{
MSG msg;
HACCEL hAccel;
HRESULT hr;
if( FAILED( WinInit( hInst, nCmdShow, &g_hWnd, &hAccel ) ) )
return FALSE;
if( FAILED( hr = InitDirectDraw( g_hWnd ) ) )
{
DXTRACE_ERR( TEXT("InitDirectDraw"), hr );
MessageBox( g_hWnd, TEXT("DirectDraw init failed. ")
TEXT("The sample will now exit. "), TEXT("DirectDraw Sample"),
MB_ICONERROR | MB_OK );
return FALSE;
}
// Display the sprites on the screen
DisplayFrame();
while( TRUE )
{
// Look for messages, if none are found then
// update the state and display it
if( PeekMessage( &msg, NULL, 0, 0, PM_NOREMOVE ) )
{
if( 0 == GetMessage(&msg, NULL, 0, 0 ) )
{
// WM_QUIT was posted, so exit
return (int)msg.wParam;
}
// Translate and dispatch the message
if( 0 == TranslateAccelerator( g_hWnd, hAccel, &msg ) )
{
TranslateMessage( &msg );
DispatchMessage( &msg );
}
}
else
{
if( g_bActive )
{
// Display the bitmap to the screen
if( FAILED( hr = ProcessNextFrame() ) )
{
SAFE_DELETE( g_pDisplay );
if( hr == E_NOTIMPL )
{
MessageBox( NULL, TEXT("The driver does not support waiting for vertical blank. ")
TEXT("This is expected if the HW acceleration is disabled. ")
TEXT("The sample will now exit. "), TEXT("DirectDraw Sample"),
MB_ICONERROR | MB_OK );
}
else
{
DXTRACE_ERR( TEXT("ProcessNextFrame"), hr );
MessageBox( g_hWnd, TEXT("Displaying the next frame failed. ")
TEXT("The sample will now exit. "), TEXT("DirectDraw Sample"),
MB_ICONERROR | MB_OK );
}
return FALSE;
}
}
else
{
// Make sure we go to sleep if we have nothing else to do
WaitMessage();
}
}
}
}
//-----------------------------------------------------------------------------
// Name: WinInit()
// Desc: Init the window
//-----------------------------------------------------------------------------
HRESULT WinInit( HINSTANCE hInst, int nCmdShow, HWND* phWnd, HACCEL* phAccel )
{
WNDCLASS wc;
HWND hWnd;
HACCEL hAccel;
// Register the Window Class
wc.lpszClassName = TEXT("AnimatePalette");
wc.lpfnWndProc = MainWndProc;
wc.style = CS_VREDRAW | CS_HREDRAW;
wc.hInstance = hInst;
wc.hIcon = LoadIcon( hInst, MAKEINTRESOURCE(IDI_MAIN) );
wc.hCursor = LoadCursor( NULL, IDC_ARROW );
wc.hbrBackground = (HBRUSH) (COLOR_WINDOW + 1);
wc.lpszMenuName = NULL;
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
if( RegisterClass( &wc ) == 0 )
return E_FAIL;
// Load keyboard accelerators
hAccel = LoadAccelerators( hInst, MAKEINTRESOURCE(IDR_MAIN_ACCEL) );
// Create and show the main window
hWnd = CreateWindowEx( 0, TEXT("AnimatePalette"), TEXT("DirectDraw AnimatePalette Sample"),
WS_POPUP, CW_USEDEFAULT, CW_USEDEFAULT,
CW_USEDEFAULT, CW_USEDEFAULT, NULL, NULL, hInst, NULL );
if( hWnd == NULL )
return E_FAIL;
ShowWindow( hWnd, nCmdShow );
UpdateWindow( hWnd );
*phWnd = hWnd;
*phAccel = hAccel;
return S_OK;
}
//-----------------------------------------------------------------------------
// Name: InitDirectDraw()
// Desc: Create the DirectDraw object, and init the surfaces
//-----------------------------------------------------------------------------
HRESULT InitDirectDraw( HWND hWnd )
{
HRESULT hr;
int iSprite;
g_pDisplay = new CDisplay();
if( FAILED( hr = g_pDisplay->CreateFullScreenDisplay( hWnd, SCREEN_WIDTH,
SCREEN_HEIGHT, SCREEN_BPP ) ) )
{
MessageBox( hWnd, TEXT("This display card does not support 640x480x8. "),
TEXT("DirectDraw Sample"), MB_ICONERROR | MB_OK );
return DXTRACE_ERR( TEXT("CreateFullScreenDisplay"), hr );
}
// Create and set the palette when in palettized color
if( FAILED( hr = g_pDisplay->CreatePaletteFromBitmap( &g_pDDPal, MAKEINTRESOURCE( IDB_DIRECTX ) ) ) )
return DXTRACE_ERR( TEXT("CreatePaletteFromBitmap"), hr );
if( FAILED( hr = g_pDisplay->SetPalette( g_pDDPal ) ) )
return DXTRACE_ERR( TEXT("SetPalette"), hr );
// Store the palette entires in a global data structure
// so we can animate the palette
if( FAILED( hr = g_pDDPal->GetEntries(0, 0, 256, g_pe ) ) )
return DXTRACE_ERR( TEXT("GetEntries"), hr );
// Create a surface, and draw a bitmap resource on it.
if( FAILED( hr = g_pDisplay->CreateSurfaceFromBitmap( &g_pLogoSurface, MAKEINTRESOURCE( IDB_DIRECTX ),
SPRITE_DIAMETER, SPRITE_DIAMETER ) ) )
return DXTRACE_ERR( TEXT("CreateSurfaceFromBitmap"), hr );
// Create a surface, and draw text to it.
if( FAILED( hr = g_pDisplay->CreateSurfaceFromText( &g_pTextSurface, NULL, HELPTEXT,
RGB(0,0,0), RGB(255, 255, 0) ) ) )
return DXTRACE_ERR( TEXT("CreateSurfaceFromText"), hr );
// Set the color key for the logo sprite to black
if( FAILED( hr = g_pLogoSurface->SetColorKey( 0 ) ) )
return DXTRACE_ERR( TEXT("SetColorKey"), hr );
// Init all the sprites. All of these sprites look the same,
// using the g_pDDSLogo surface.
for( iSprite = 0; iSprite < NUM_SPRITES; iSprite++ )
{
// Set the sprite's position and velocity
g_Sprite[iSprite].fPosX = (float) (rand() % SCREEN_WIDTH);
g_Sprite[iSprite].fPosY = (float) (rand() % SCREEN_HEIGHT);
g_Sprite[iSprite].fVelX = 500.0f * rand() / RAND_MAX - 250.0f;
g_Sprite[iSprite].fVelY = 500.0f * rand() / RAND_MAX - 250.0f;
}
return S_OK;
}
//-----------------------------------------------------------------------------
// Name: FreeDirectDraw()
// Desc: Release all the DirectDraw objects
//-----------------------------------------------------------------------------
VOID FreeDirectDraw()
{
SAFE_DELETE( g_pLogoSurface );
SAFE_DELETE( g_pTextSurface );
SAFE_DELETE( g_pDisplay );
}
//-----------------------------------------------------------------------------
// Name: MainWndProc()
// Desc: The main window procedure
//-----------------------------------------------------------------------------
LRESULT CALLBACK MainWndProc( HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam )
{
switch (msg)
{
case WM_COMMAND:
switch( LOWORD(wParam) )
{
case IDM_EXIT:
// Received key/menu command to exit app
PostMessage( hWnd, WM_CLOSE, 0, 0 );
return 0L;
}
break; // Continue with default processing
case WM_SETCURSOR:
// Hide the cursor in fullscreen
SetCursor( NULL );
return TRUE;
case WM_SIZE:
// Check to see if we are losing our window...
if( SIZE_MAXHIDE==wParam || SIZE_MINIMIZED==wParam )
g_bActive = FALSE;
else
g_bActive = TRUE;
break;
case WM_SYSCOMMAND:
// Prevent moving/sizing and power loss in fullscreen mode
switch( wParam )
{
case SC_MOVE:
case SC_SIZE:
case SC_MAXIMIZE:
case SC_MONITORPOWER:
return TRUE;
}
break;
case WM_EXITMENULOOP:
// Ignore time spent in menu
g_dwLastTick = timeGetTime();
break;
case WM_EXITSIZEMOVE:
// Ignore time spent resizing
g_dwLastTick = timeGetTime();
break;
case WM_DESTROY:
// Cleanup and close the app
FreeDirectDraw();
PostQuitMessage( 0 );
return 0L;
}
return DefWindowProc(hWnd, msg, wParam, lParam);
}
//-----------------------------------------------------------------------------
// Name: ProcessNextFrame()
// Desc: Move the sprites, blt them to the back buffer, then
// flips the back buffer to the primary buffer
//-----------------------------------------------------------------------------
HRESULT ProcessNextFrame()
{
HRESULT hr;
// Figure how much time has passed since the last time
DWORD dwCurrTick = timeGetTime();
DWORD dwTickDiff = dwCurrTick - g_dwLastTick;
// Don't update if no time has passed
if( dwTickDiff == 0 )
return S_OK;
g_dwLastTick = dwCurrTick;
// Move the sprites according to how much time has passed
for( int iSprite = 0; iSprite < NUM_SPRITES; iSprite++ )
UpdateSprite( &g_Sprite[ iSprite ], dwTickDiff / 1000.0f );
// Cycle the palette every frame
if( FAILED( hr = CyclePalette() ) )
return DXTRACE_ERR( TEXT("CyclePalette"), hr );
// Display the sprites on the screen
if( FAILED( hr = DisplayFrame() ) )
{
if( hr != DDERR_SURFACELOST )
{
FreeDirectDraw();
return DXTRACE_ERR( TEXT("DisplayFrame"), hr );
}
// The surfaces were lost so restore them
RestoreSurfaces();
}
return S_OK;
}
//-----------------------------------------------------------------------------
// Name: CyclePalette()
// Desc: Cycle the palette colors 2 through 37 - this is
// will change the color for 'X' in the sprite.
//-----------------------------------------------------------------------------
HRESULT CyclePalette()
{
HRESULT hr;
for( int i = 2; i < 37; i++ )
{
// This just does something interesting but simple by shifting each
// color component independently
g_pe[ i ].peBlue += 8;
g_pe[ i ].peRed += 4;
g_pe[ i ].peGreen += 2;
}
// Wait until the screen is synchronzied at a vertical-blank interval.
// This may return E_NOTIMPL if the ddraw is not hardware accelerated
hr = g_pDisplay->GetDirectDraw()->WaitForVerticalBlank( DDWAITVB_BLOCKBEGIN, NULL );
if( FAILED( hr ) )
{
FreeDirectDraw();
return DXTRACE_ERR( TEXT("WaitForVerticalBlank"), hr );
}
// Now that we are synchronzied at a vertical-blank
// interval, update the palette
if( FAILED( hr = g_pDDPal->SetEntries( 0, 0, 256, g_pe ) ) )
{
FreeDirectDraw();
return DXTRACE_ERR( TEXT("SetEntries"), hr );
}
return S_OK;
}
//-----------------------------------------------------------------------------
// Name: UpdateSprite()
// Desc: Move the sprite around and make it bounce based on how much time
// has passed
//-----------------------------------------------------------------------------
VOID UpdateSprite( SPRITE_STRUCT* pSprite, FLOAT fTimeDelta )
{
// Update the sprite position
pSprite->fPosX += pSprite->fVelX * fTimeDelta;
pSprite->fPosY += pSprite->fVelY * fTimeDelta;
// Clip the position, and bounce if it hits the edge
if( pSprite->fPosX < 0.0f )
{
pSprite->fPosX = 0;
pSprite->fVelX = -pSprite->fVelX;
}
if( pSprite->fPosX >= SCREEN_WIDTH - SPRITE_DIAMETER )
{
pSprite->fPosX = SCREEN_WIDTH - 1 - SPRITE_DIAMETER;
pSprite->fVelX = -pSprite->fVelX;
}
if( pSprite->fPosY < 0 )
{
pSprite->fPosY = 0;
pSprite->fVelY = -pSprite->fVelY;
}
if( pSprite->fPosY > SCREEN_HEIGHT - SPRITE_DIAMETER )
{
pSprite->fPosY = SCREEN_HEIGHT - 1 - SPRITE_DIAMETER;
pSprite->fVelY = -pSprite->fVelY;
}
}
//-----------------------------------------------------------------------------
// Name: DisplayFrame()
// Desc: Blts a the sprites to the back buffer, then flips the
// back buffer onto the primary buffer.
//-----------------------------------------------------------------------------
HRESULT DisplayFrame()
{
HRESULT hr;
if( NULL == g_pDisplay )
return S_OK;
// Fill the back buffer with black, ignoring errors until the flip
g_pDisplay->Clear( 0 );
// Blt the help text on the backbuffer, ignoring errors until the flip
g_pDisplay->Blt( 10, 10, g_pTextSurface, NULL );
// Blt all the sprites onto the back buffer using color keying,
// ignoring errors until the flip. Note that all of these sprites
// use the same DirectDraw surface.
for( int iSprite = 0; iSprite < NUM_SPRITES; iSprite++ )
{
g_pDisplay->Blt( (DWORD)g_Sprite[iSprite].fPosX,
(DWORD)g_Sprite[iSprite].fPosY,
g_pLogoSurface, NULL );
}
// We are in fullscreen mode, so perform a flip and return
// any errors like DDERR_SURFACELOST
if( FAILED( hr = g_pDisplay->Present() ) )
{
return hr;
}
return S_OK;
}
//-----------------------------------------------------------------------------
// Name: RestoreSurfaces()
// Desc: Restore all the surfaces, and redraw the sprite surfaces.
//-----------------------------------------------------------------------------
HRESULT RestoreSurfaces()
{
HRESULT hr;
if( FAILED( hr = g_pDisplay->GetDirectDraw()->RestoreAllSurfaces() ) )
return DXTRACE_ERR( TEXT("RestoreAllSurfaces"), hr );
// No need to re-create the surface, just re-draw it.
if( FAILED( hr = g_pTextSurface->DrawText( NULL, HELPTEXT,
0, 0, RGB(0,0,0), RGB(255, 255, 0) ) ) )
return DXTRACE_ERR( TEXT("DrawText"), hr );
// We need to release and re-load, and set the palette again to
// redraw the bitmap on the surface. Otherwise, GDI will not
// draw the bitmap on the surface with the right palette
SAFE_RELEASE( g_pDDPal );
if( FAILED( hr = g_pDisplay->CreatePaletteFromBitmap( &g_pDDPal, MAKEINTRESOURCE( IDB_DIRECTX ) ) ) )
return DXTRACE_ERR( TEXT("CreatePaletteFromBitmap"), hr );
if( FAILED( hr = g_pDisplay->SetPalette( g_pDDPal ) ) )
return DXTRACE_ERR( TEXT("SetPalette"), hr );
// No need to re-create the surface, just re-draw it.
if( FAILED( hr = g_pLogoSurface->DrawBitmap( MAKEINTRESOURCE( IDB_DIRECTX ),
SPRITE_DIAMETER, SPRITE_DIAMETER ) ) )
return DXTRACE_ERR( TEXT("DrawBitmap"), hr );
return S_OK;
}