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Client/Library/dxx8/samples/Multimedia/DirectDraw/GammaControl/gammacontrol.cpp
LGram16 e067522598 Initial commit: ROW Client source code 
Game client codebase including:
- CharacterActionControl: Character and creature management
- GlobalScript: Network, items, skills, quests, utilities
- RYLClient: Main client application with GUI and event handlers
- Engine: 3D rendering engine (RYLGL)
- MemoryManager: Custom memory allocation
- Library: Third-party dependencies (DirectX, boost, etc.)
- Tools: Development utilities

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>
2025-11-29 16:24:34 +09:00

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//-----------------------------------------------------------------------------
// File: GammaControl.cpp
//
// Desc: This sample demonstrates how to use DirectDraw full-screen mode
// using the exclusive DirectDraw cooperative level.
//
// Copyright (c) 1999-2001 Microsoft Corporation. All rights reserved.
//-----------------------------------------------------------------------------
#define STRICT
#include <windows.h>
#include <ddraw.h>
#include <mmsystem.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 32
#define NUM_COLOR_BARS 63
#define HELPTEXT TEXT("Adjust the gamma level by clicking either mouse button. Press Escape to quit.")
#define GAMMATEXT TEXT("Displaying with linear gamma ramp between 0 and %0.5d")
CDisplay* g_pDisplay = NULL;
CSurface* g_pLogoSurface = NULL;
CSurface* g_pHelpTextSurface = NULL;
CSurface* g_pGammaTextSurface = NULL;
LPDIRECTDRAWGAMMACONTROL g_pGammaControl = NULL;
BOOL g_bActive = FALSE;
LONG g_lGammaRamp = 256;
//-----------------------------------------------------------------------------
// 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();
BOOL HasGammaSupport();
HRESULT UpdateGammaRamp();
HRESULT ProcessNextFrame();
HRESULT DisplayFrame();
HRESULT RestoreSurfaces();
HRESULT DrawGammaText();
//-----------------------------------------------------------------------------
// 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;
HWND hWnd;
HACCEL hAccel;
HRESULT hr;
if( FAILED( WinInit( hInst, nCmdShow, &hWnd, &hAccel ) ) )
return FALSE;
if( FAILED( InitDirectDraw( hWnd ) ) )
{
SAFE_DELETE( g_pDisplay );
MessageBox( hWnd, TEXT("DirectDraw init failed. ")
TEXT("The sample will now exit. "), TEXT("DirectDraw Sample"),
MB_ICONERROR | MB_OK );
return FALSE;
}
if( HasGammaSupport() == FALSE )
{
SAFE_DELETE( g_pDisplay );
MessageBox( hWnd, TEXT("The primary surface does not support gamma control. ")
TEXT("The sample will now exit. "), TEXT("DirectDraw Sample"),
MB_ICONERROR | MB_OK );
return FALSE;
}
if( FAILED( hr = g_pDisplay->GetFrontBuffer()->QueryInterface( IID_IDirectDrawGammaControl,
(LPVOID*) &g_pGammaControl ) ) )
{
SAFE_DELETE( g_pDisplay );
MessageBox( hWnd, TEXT("The primary surface does not support IDirectDrawGammaControl. ")
TEXT("The sample will now exit. "), TEXT("DirectDraw Sample"),
MB_ICONERROR | MB_OK );
return FALSE;
}
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( hWnd, hAccel, &msg ) )
{
TranslateMessage( &msg );
DispatchMessage( &msg );
}
}
else
{
if( g_bActive )
{
// Move the sprites, blt them to the back buffer, then
// flip or blt the back buffer to the primary buffer
if( FAILED( ProcessNextFrame() ) )
{
SAFE_DELETE( g_pDisplay );
MessageBox( 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("GammaControl");
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("GammaControl"), TEXT("DirectDraw GammaControl 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;
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 hr;
}
// Create a surface, and draw text to it.
if( FAILED( hr = g_pDisplay->CreateSurfaceFromText( &g_pHelpTextSurface, NULL, HELPTEXT,
RGB(0,0,0), RGB(255, 255, 0) ) ) )
return hr;
TCHAR strGammaText[256];
wsprintf( strGammaText, GAMMATEXT, g_lGammaRamp * 256 );
if( FAILED( hr = g_pDisplay->CreateSurfaceFromText( &g_pGammaTextSurface, NULL, strGammaText,
RGB(0,0,0), RGB(255, 255, 0) ) ) )
return hr;
return S_OK;
}
//-----------------------------------------------------------------------------
// Name: FreeDirectDraw()
// Desc: Release all the DirectDraw objects
//-----------------------------------------------------------------------------
VOID FreeDirectDraw()
{
SAFE_DELETE( g_pHelpTextSurface );
SAFE_DELETE( g_pGammaTextSurface );
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_LBUTTONDOWN:
g_lGammaRamp -= 8;
if( g_lGammaRamp < 0 )
g_lGammaRamp = 0;
if( FAILED( UpdateGammaRamp() ) )
{
SAFE_DELETE( g_pDisplay );
MessageBox( hWnd, TEXT("Failed setting the new gamma level. ")
TEXT("The sample will now exit. "), TEXT("DirectDraw Sample"),
MB_ICONERROR | MB_OK );
PostQuitMessage( 0 );
}
break;
case WM_RBUTTONDOWN:
g_lGammaRamp += 8;
if( g_lGammaRamp > 256 )
g_lGammaRamp = 256;
if( FAILED( UpdateGammaRamp() ) )
{
SAFE_DELETE( g_pDisplay );
MessageBox( hWnd, TEXT("Failed setting the new gamma level. ")
TEXT("The sample will now exit. "), TEXT("DirectDraw Sample"),
MB_ICONERROR | MB_OK );
PostQuitMessage( 0 );
}
break;
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_DESTROY:
// Cleanup and close the app
FreeDirectDraw();
PostQuitMessage( 0 );
return 0L;
}
return DefWindowProc(hWnd, msg, wParam, lParam);
}
//-----------------------------------------------------------------------------
// Name: HasGammaSupport()
// Desc: Returns TRUE if the device supports gamma control, FALSE otherwise
//-----------------------------------------------------------------------------
BOOL HasGammaSupport()
{
// Get driver capabilities to determine gamma support.
DDCAPS ddcaps;
ZeroMemory( &ddcaps, sizeof(ddcaps) );
ddcaps.dwSize = sizeof(ddcaps);
g_pDisplay->GetDirectDraw()->GetCaps( &ddcaps, NULL );
// Does the driver support gamma?
// The DirectDraw emulation layer does not support overlays
// so gamma related APIs will fail without hardware support.
if( ddcaps.dwCaps2 & DDCAPS2_PRIMARYGAMMA )
return TRUE;
else
return FALSE;
}
//-----------------------------------------------------------------------------
// Name: UpdateGammaRamp()
// Desc:
//-----------------------------------------------------------------------------
HRESULT UpdateGammaRamp()
{
HRESULT hr;
DDGAMMARAMP ddgr;
WORD dwGamma;
ZeroMemory( &ddgr, sizeof(ddgr) );
if( FAILED( hr = g_pGammaControl->GetGammaRamp( 0, &ddgr ) ) )
return hr;
dwGamma = 0;
for( int iColor = 0; iColor < 256; iColor++ )
{
ddgr.red[iColor] = dwGamma;
ddgr.green[iColor] = dwGamma;
ddgr.blue[iColor] = dwGamma;
dwGamma += (WORD) g_lGammaRamp;
}
if( FAILED( hr = g_pGammaControl->SetGammaRamp( 0, &ddgr ) ) )
return hr;
if( FAILED( hr = DrawGammaText() ) )
return hr;
return S_OK;
}
//-----------------------------------------------------------------------------
// 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;
// Display the sprites on the screen
if( FAILED( hr = DisplayFrame() ) )
{
if( hr != DDERR_SURFACELOST )
return hr;
// The surfaces were lost so restore them
RestoreSurfaces();
}
return S_OK;
}
//-----------------------------------------------------------------------------
// Name: DisplayFrame()
// Desc: Blts a the color bars to the back buffer, then flips the
// back buffer onto the primary buffer.
//-----------------------------------------------------------------------------
HRESULT DisplayFrame()
{
DDSURFACEDESC2 ddsd;
HRESULT hr;
DDBLTFX ddbltfx;
RECT rctDest;
DWORD dwRShift;
DWORD dwGShift;
DWORD dwBShift;
DWORD dwRColorLevels;
DWORD dwGColorLevels;
DWORD dwBColorLevels;
DWORD dwBits;
DWORD dwColor;
LPDIRECTDRAWSURFACE7 pFrontBuffer;
LPDIRECTDRAWSURFACE7 pBackBuffer;
pFrontBuffer = g_pDisplay->GetFrontBuffer();
pBackBuffer = g_pDisplay->GetBackBuffer();
ZeroMemory( &ddsd,sizeof(ddsd) );
ddsd.dwSize = sizeof(ddsd);
if( FAILED( hr = pFrontBuffer->GetSurfaceDesc( &ddsd ) ) )
return hr;
// Fill the back buffer with black, ignoring errors until the flip
g_pDisplay->Clear(0);
CSurface::GetBitMaskInfo( ddsd.ddpfPixelFormat.dwRBitMask, &dwRShift, &dwBits );
CSurface::GetBitMaskInfo( ddsd.ddpfPixelFormat.dwGBitMask, &dwGShift, &dwBits );
CSurface::GetBitMaskInfo( ddsd.ddpfPixelFormat.dwBBitMask, &dwBShift, &dwBits );
dwRColorLevels = ddsd.ddpfPixelFormat.dwRBitMask >> dwRShift;
dwGColorLevels = ddsd.ddpfPixelFormat.dwGBitMask >> dwGShift;
dwBColorLevels = ddsd.ddpfPixelFormat.dwBBitMask >> dwBShift;
ZeroMemory( &ddbltfx, sizeof(ddbltfx) );
ddbltfx.dwSize = sizeof(ddbltfx);
for( DWORD i = 0; i <= NUM_COLOR_BARS; i++ )
{
rctDest.left = SCREEN_WIDTH / (NUM_COLOR_BARS + 1) * (i + 0);
rctDest.right = SCREEN_WIDTH / (NUM_COLOR_BARS + 1) * (i + 1);
// Figure out the color for the red color bar
dwColor = (DWORD) ( dwRColorLevels * i / (float) NUM_COLOR_BARS );
ddbltfx.dwFillColor = dwColor << dwRShift;
rctDest.top = SCREEN_HEIGHT / 3 * 0;
rctDest.bottom = SCREEN_HEIGHT / 3 * 1;
pBackBuffer->Blt( &rctDest, NULL, NULL,
DDBLT_COLORFILL | DDBLT_WAIT,
&ddbltfx );
// Figure out the color for the green color bar
dwColor = (DWORD) ( dwGColorLevels * i / (float) NUM_COLOR_BARS );
ddbltfx.dwFillColor = dwColor << dwGShift;
rctDest.top = SCREEN_HEIGHT / 3 * 1;
rctDest.bottom = SCREEN_HEIGHT / 3 * 2;
pBackBuffer->Blt( &rctDest, NULL, NULL,
DDBLT_COLORFILL | DDBLT_WAIT,
&ddbltfx );
// Figure out the color for the blue color bar
dwColor = (DWORD) ( dwBColorLevels * i / (float) NUM_COLOR_BARS );
ddbltfx.dwFillColor = dwColor << dwBShift;
rctDest.top = SCREEN_HEIGHT / 3 * 2;
rctDest.bottom = SCREEN_HEIGHT / 3 * 3;
pBackBuffer->Blt( &rctDest, NULL, NULL,
DDBLT_COLORFILL | DDBLT_WAIT,
&ddbltfx );
}
// Blt the help text on the backbuffer, ignoring errors until the flip
g_pDisplay->Blt( 10, 10, g_pHelpTextSurface, NULL );
g_pDisplay->Blt( 10, 30, g_pGammaTextSurface, 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 hr;
// No need to re-create the surface, just re-draw it.
if( FAILED( hr = g_pHelpTextSurface->DrawText( NULL, HELPTEXT,
0, 0, RGB(0,0,0), RGB(255, 255, 0) ) ) )
return hr;
DrawGammaText();
return S_OK;
}
//-----------------------------------------------------------------------------
// Name: DrawGammaText()
// Desc:
//-----------------------------------------------------------------------------
HRESULT DrawGammaText()
{
HRESULT hr;
TCHAR strGammaText[256];
wsprintf( strGammaText, GAMMATEXT, g_lGammaRamp * 256 );
if( FAILED( hr = g_pGammaTextSurface->DrawText( NULL, strGammaText,
0, 0, RGB(0,0,0), RGB(255, 255, 0) ) ) )
return hr;
return S_OK;
}
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