Retired Document
Important: This sample code may not represent best practices for current development. The project may use deprecated symbols and illustrate technologies and techniques that are no longer recommended.
DSp Context Switch Main.c
/* |
File: DSp Context Switch Main.c |
Contains: Source file for demonstration of DSp 1.7 or 1.1.4 context switching |
right arrow for a larger context; left arrow for smaller; Cmd-Q to exit. |
Written by: Geoff Stahl (ggs) |
Copyright: Copyright (c) 1999 Apple Computer, Inc., All Rights Reserved. |
Change History (most recent first): |
<3+> 10/11/99 ggs |
<3> 10/10/99 ggs Header clean up |
<2> 10/10/99 ggs Added support for DSP 1.1.4 with code that does the equivalent |
of context switching |
<1> 10/10/99 ggs Initial Add |
Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple Computer, Inc. |
("Apple") in consideration of your agreement to the following terms, and your |
use, installation, modification or redistribution of this Apple software |
constitutes acceptance of these terms. If you do not agree with these terms, |
please do not use, install, modify or redistribute this Apple software. |
In consideration of your agreement to abide by the following terms, and subject |
to these terms, Apple grants you a personal, non-exclusive license, under AppleÕs |
copyrights in this original Apple software (the "Apple Software"), to use, |
reproduce, modify and redistribute the Apple Software, with or without |
modifications, in source and/or binary forms; provided that if you redistribute |
the Apple Software in its entirety and without modifications, you must retain |
this notice and the following text and disclaimers in all such redistributions of |
the Apple Software. Neither the name, trademarks, service marks or logos of |
Apple Computer, Inc. may be used to endorse or promote products derived from the |
Apple Software without specific prior written permission from Apple. Except as |
expressly stated in this notice, no other rights or licenses, express or implied, |
are granted by Apple herein, including but not limited to any patent rights that |
may be infringed by your derivative works or by other works in which the Apple |
Software may be incorporated. |
The Apple Software is provided by Apple on an "AS IS" basis. APPLE MAKES NO |
WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED |
WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE OR IN |
COMBINATION WITH YOUR PRODUCTS. |
IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR |
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE |
GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION, MODIFICATION AND/OR DISTRIBUTION |
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*/ |
// system includes ---------------------------------------------------------- |
#include <Events.h> |
#include <Fonts.h> |
#include <Windows.h> |
#include <Dialogs.h> |
#include <ToolUtils.h> |
#include <Devices.h> |
#include <DrawSprocket.h> |
#include <stdio.h> |
// project includes --------------------------------------------------------- |
// function declarations ---------------------------------------------------- |
void InitToolbox(void); |
void GraphicsInitAttributes(DSpContextAttributes *inAttributes); |
Boolean SetUp (void); |
void DoMenu (SInt32 menuResult); |
void SwitchDSpContext(short context); |
void DoKey (SInt8 theKey, SInt8 theCode); |
void CToPStr (register const char *inString, Str255 * outString ); |
void DoUpdate (void); |
void DoEvent (void); |
void CleanUp (void); |
// statics/globals (internal only) ------------------------------------------ |
// Menu defs |
enum |
{ |
kNumContexts = 8, |
kBitsPerPixel = 16, |
kMenuApple = 128, |
kMenuFile = 129, |
kAppleAbout = 1, |
kFileDoNothing = 1, |
kFileQuit |
}; |
Boolean gDone = false; |
UInt32 gSleepTime = 1; |
RGBColor grgbColor = {0x5000,0x5000,0x5000}; |
short gContextCurrent = 0; |
short gActualNumContexts = 0; |
Point gapntResolution [kNumContexts] = {{480, 640}, {600, 800}, {624, 832}, {768, 1024}, {870, 1152}, {1024, 1280}, {1600, 1200}, {1920, 1440}}; |
DSpContextAttributes gaContextAttributes [kNumContexts]; |
DSpContextReference gaContextRef [kNumContexts]; |
DSpContextReference * gpContextRefUnused = NULL; |
unsigned long gDisplayID; |
GDHandle ghGD; |
short gnumDevices = 0; |
Boolean gfDSp17 = true; |
// functions (internal/private) --------------------------------------------- |
void InitToolbox (void) |
{ |
MenuHandle menu; |
SInt16 modifiers = 0; |
EventRecord event; |
MaxApplZone (); |
InitGraf((Ptr) &qd.thePort); |
InitFonts(); |
InitWindows(); |
InitMenus(); |
TEInit(); |
InitDialogs(nil); |
InitCursor(); |
qd.randSeed = (long) TickCount(); |
// init events |
EventAvail(everyEvent, &event); |
modifiers |= event.modifiers; |
EventAvail(everyEvent, &event); |
modifiers |= event.modifiers; |
EventAvail(everyEvent, &event); |
modifiers |= event.modifiers; |
// Init Menus |
menu = NewMenu (kMenuApple, "\p\024"); // new apple menu |
InsertMenu (menu, 0); // add menu to end |
AppendResMenu(menu, 'DRVR'); |
menu = NewMenu (kMenuFile, "\pFile"); // new menu |
InsertMenu (menu, 0); // add menu to end |
AppendMenu (menu, "\pDo Nothing;Quit/Q"); // add items |
DrawMenuBar(); |
} |
// -------------------------------------------------------------------------- |
void GraphicsInitAttributes(DSpContextAttributes *inAttributes) |
{ |
BlockZero (inAttributes, sizeof (DSpContextAttributes)); |
} |
// -------------------------------------------------------------------------- |
Boolean SetUp (void) |
{ |
OSStatus err = noErr; |
short i, context; |
InitToolbox (); |
// Do DrawSprocket Setup |
if ((Ptr) kUnresolvedCFragSymbolAddress == (Ptr) DSpStartup) |
{ |
DebugStr("\pDSp extension not loaded\n"); |
return false; |
} |
if (DSpStartup () != noErr) |
{ |
DebugStr("\pUnable to startup DSp\n"); |
return false; |
} |
if ((Ptr) kUnresolvedCFragSymbolAddress == (Ptr) DSpGetVersion) |
gfDSp17 = false; |
else |
{ |
// do not use built in DSpContext_Reserve and DSpContext_Queue prior to DSp 1.7.3 |
NumVersion version = DSpGetVersion (); |
if ((version.majorRev < 0x01) || ((version.majorRev == 0x01) && (version.minorAndBugRev < 0x73))) |
gfDSp17 = false; |
} |
context = 0; |
for (i = 0; i < kNumContexts; i++) // get all of our possible contexts kNumContexts |
{ |
GraphicsInitAttributes (&gaContextAttributes [context]); |
gaContextAttributes [context].displayWidth = gapntResolution [i].h; |
gaContextAttributes [context].displayHeight = gapntResolution [i].v; |
gaContextAttributes [context].colorNeeds = kDSpColorNeeds_Require; |
gaContextAttributes [context].displayBestDepth = kBitsPerPixel; |
gaContextAttributes [context].displayDepthMask = kDSpDepthMask_All; |
// this is required prior to DSp 1.7.3, even if you only need one buffer |
gaContextAttributes [context].backBufferBestDepth = kBitsPerPixel; |
gaContextAttributes [context].backBufferDepthMask = kDSpDepthMask_All; |
gaContextAttributes [context].pageCount = 1; // only the front buffer is needed |
// use two above if you want to swap buffers to animate |
if (0 == context) // for the first context |
{ |
// will display user dialog if context selection is required otherwise as find best context |
err = DSpUserSelectContext(&gaContextAttributes [context], 0, nil, &gaContextRef[context]); |
if (err != noErr) |
{ |
// DebugStr("\pA suitable display context could not be found."); |
} |
if (noErr != DSpContext_GetAttributes (gaContextRef[context], &gaContextAttributes [context])) // see what we actually found |
{ |
DebugStr("\pUnable to get attributes\n"); |
} |
gaContextAttributes [context].displayWidth = gapntResolution [i].h; |
gaContextAttributes [context].displayHeight = gapntResolution [i].v; |
gaContextAttributes [context].pageCount = 1; // only the front buffer is needed |
gaContextAttributes [context].contextOptions = 0 | kDSpContextOption_DontSyncVBL; // no page flipping and no VBL sync needed |
// get our device for future use |
err = DSpContext_GetDisplayID (gaContextRef [context], &gDisplayID); |
if (err != noErr) |
{ |
DebugStr("\pDSpContext_GetDisplayID () had an error."); |
return false; |
} |
// get GDHandle for ID'd device |
err = DMGetGDeviceByDisplayID (gDisplayID, &ghGD, false); |
if (err != noErr) |
{ |
DebugStr("\pDMGetGDeviceByDisplayID() had an error."); |
return false; |
} |
if (false == gfDSp17) // reserve contexts on other screens to prevent selection |
{ |
GDHandle hDevice = DMGetFirstScreenDevice (true); // check number of screens |
short indexDevice = 0; |
do |
{ |
gnumDevices++; |
hDevice = DMGetNextScreenDevice (hDevice, true); |
} |
while (hDevice); |
gnumDevices--; // only count unsued screens |
if (gnumDevices) |
{ |
gpContextRefUnused = (DSpContextReference *) NewPtr ((long) sizeof (DSpContextReference) * gnumDevices); |
hDevice = DMGetFirstScreenDevice (true); // check number of screens |
do |
{ |
if (hDevice != ghGD) // if this device is not the one the user chose |
{ |
unsigned long displayID; |
DSpContextAttributes contextAttributes; |
err = DMGetDisplayIDByGDevice (hDevice, &displayID, false); |
err = DSpGetFirstContext (displayID, &gpContextRefUnused [indexDevice]); // get a context and |
err = DSpContext_GetAttributes (gpContextRefUnused [indexDevice], &contextAttributes); // find attributes |
err = DSpContext_Reserve (gpContextRefUnused [indexDevice], &contextAttributes); // reserve it |
indexDevice++; |
} |
hDevice = DMGetNextScreenDevice (hDevice, true); |
} |
while (hDevice); |
} |
} |
} |
else |
{ |
// find a context on the display used in the first context |
if (false == gfDSp17) |
err = DSpFindBestContext (&gaContextAttributes [context], &gaContextRef [context]); |
else // in this case we have reserved contexts on all other screens thus they will not be considered |
err = DSpFindBestContextOnDisplayID (&gaContextAttributes [context], &gaContextRef [context], gDisplayID); |
if (noErr == err) |
{ |
if (noErr != DSpContext_GetAttributes (gaContextRef[context], &gaContextAttributes [context])) // see what we actually found |
{ |
DebugStr("\pUnable to get attributes\n"); |
} |
gaContextAttributes [context].displayWidth = gapntResolution [context].h; |
gaContextAttributes [context].displayHeight = gapntResolution [context].v; |
gaContextAttributes [context].pageCount = 1; // only the front buffer is needed |
gaContextAttributes [context].contextOptions = 0 | kDSpContextOption_DontSyncVBL; // no page flipping and no VBL sync needed |
} |
else |
{ |
// DebugStr( "\pDSpFindBestContextOnDisplayID could not find context"); |
} |
} |
if (gaContextRef[context]) // if we use that slot |
{ |
context++; |
gActualNumContexts++; |
} |
} |
gContextCurrent = 0; // start at the first |
// reserve our context |
err = DSpContext_Reserve (gaContextRef [gContextCurrent], &gaContextAttributes [gContextCurrent]); |
if (err != noErr) |
{ |
DebugStr("\pUnable to create the display!"); |
return false; |
} |
if (false == gfDSp17) |
{ |
// do nothing |
} |
else |
{ |
for (i = 1; i < gActualNumContexts; i++) // get all of our contexts |
{ |
// queue it for switch |
err = DSpContext_Queue(gaContextRef [gContextCurrent], gaContextRef [i], &gaContextAttributes [i]); |
if (err) |
DebugStr( "\pDSpContext_Queue() had an error."); |
} |
} |
DSpSetBlankingColor(&grgbColor); |
HideCursor(); |
err = DSpContext_FadeGammaOut (NULL, NULL); // remove for debug |
if (err != noErr) |
DebugStr("\pUnable to fade the display!"); |
// activate our context |
err = DSpContext_SetState (gaContextRef [gContextCurrent], kDSpContextState_Active); |
if (err != noErr) |
{ |
DebugStr("\pUnable to set the display!"); |
return false; |
} |
err = DSpContext_FadeGammaIn (NULL, NULL); |
if(err) |
DebugStr("\pUnable to fade the display!"); |
return true; |
} |
// -------------------------------------------------------------------------- |
void DoMenu (SInt32 menuResult) |
{ |
SInt16 theMenu; |
SInt16 theItem; |
Str255 daName; |
MenuRef theMenuHandle; |
theMenu = HiWord(menuResult); |
theItem = LoWord(menuResult); |
theMenuHandle = GetMenuHandle(theMenu); |
switch (theMenu) |
{ |
case kMenuApple: |
switch (theItem) |
{ |
case kAppleAbout: |
break; |
default: |
OpenDeskAcc(daName); |
break; |
} |
break; |
case kMenuFile: |
switch (theItem) |
{ |
case kFileDoNothing: |
break; |
case kFileQuit: |
gDone = true; |
break; |
} |
break; |
} |
HiliteMenu(0); |
DrawMenuBar(); |
} |
// -------------------------------------------------------------------------- |
void SwitchDSpContext(short context) |
{ |
OSStatus err; |
if(gContextCurrent != context) |
{ |
if(gaContextRef[gContextCurrent] && gaContextRef[context]) |
{ |
if (false == gfDSp17) |
{ |
// fade out |
err = DSpContext_FadeGammaOut (NULL, NULL); // remove for debug |
if (err != noErr) |
DebugStr("\pUnable to fade the display!"); |
// deactivate our context |
err = DSpContext_SetState (gaContextRef [gContextCurrent], kDSpContextState_Inactive); |
if (err != noErr) |
DebugStr("\pUnable to set the display!"); |
// release |
err = DSpContext_Release (gaContextRef [0]); |
if (err != noErr) |
DebugStr ("\pDSpContext_Release error"); |
// reserve |
err = DSpContext_Reserve (gaContextRef [context], &gaContextAttributes [context]); |
if (err != noErr) |
DebugStr("\pUnable to create the display!"); |
// activate |
err = DSpContext_SetState (gaContextRef [context], kDSpContextState_Active); |
if (err != noErr) |
DebugStr("\pUnable to set the display!"); |
// fade in |
err = DSpContext_FadeGammaIn (NULL, NULL); |
if(err) |
DebugStr("\pUnable to fade the display!"); |
if(err) |
DebugStr ("\pUnable to switch displays"); |
else |
gContextCurrent = context; |
} |
else |
{ |
err = DSpContext_Switch(gaContextRef[gContextCurrent], gaContextRef[context]); |
if(err) |
DebugStr ("\pUnable to switch displays"); |
else |
gContextCurrent = context; |
} |
} |
} |
} |
// -------------------------------------------------------------------------- |
void DoKey (SInt8 theKey, SInt8 theCode) |
{ |
#pragma unused (theCode) |
short context = gContextCurrent; |
if (theKey == '\35') |
{ |
if (++context == gActualNumContexts) |
context = 0; |
SwitchDSpContext (context); |
DoUpdate (); |
} |
else if (theKey == '\34') |
{ |
if (--context < 0) |
context = (short) (gActualNumContexts - 1); |
SwitchDSpContext (context); |
DoUpdate (); |
} |
} |
//--------------------------------------------------------------------------- |
// Copy C string to Pascal string |
void CToPStr (register const char *inString, Str255 * outString ) // copies in to out |
{ |
register unsigned char x = 0; |
do |
{ |
*(((char*)outString) + 1 + x) = *(inString + x); |
x++; |
} |
while ((*(inString + x) != 0) && (x < 256)); |
*((char*)outString) = (char) x; |
} |
// -------------------------------------------------------------------------- |
void DoUpdate (void) |
{ |
OSStatus err; |
CGrafPtr pCGrafFrontBuffer, pCGrafSave = NULL; |
GDHandle hGDSave; |
RGBColor rgbSave, rgbRed = {0x7FFF, 0x0000, 0x0000}, rgbWhite = {0xFFFF, 0xFFFF, 0xFFFF}; |
short fNum, len; |
Str255 aStr = "\p"; |
char aChar[256]; |
err = DSpContext_GetFrontBuffer (gaContextRef [gContextCurrent], &pCGrafFrontBuffer); |
if (err != noErr) |
{ |
DebugStr("\pUnable to get front buffer"); |
return; |
} |
GetGWorld (&pCGrafSave, &hGDSave); |
SetGWorld (pCGrafFrontBuffer, ghGD); |
GetForeColor (&rgbSave); |
// draw here |
RGBForeColor (&rgbRed); |
PaintRect (&pCGrafFrontBuffer->portRect); |
RGBForeColor (&rgbWhite); |
// set text |
GetFNum("\pGeneva", &fNum); |
TextFont(fNum); |
TextSize(12); |
// draw centered to screen |
sprintf (aChar, "%d x %d", gapntResolution [gContextCurrent].h, gapntResolution [gContextCurrent].v); |
CToPStr (aChar, &aStr); |
len = StringWidth (aStr); |
MoveTo ((short) (pCGrafFrontBuffer->portRect.left + (pCGrafFrontBuffer->portRect.right - pCGrafFrontBuffer->portRect.left) / 2 - (len / 2)), 18); |
DrawString(aStr); |
RGBForeColor (&rgbSave); |
SetGWorld (pCGrafSave, hGDSave); |
} |
// -------------------------------------------------------------------------- |
void DoEvent (void) |
{ |
EventRecord theEvent; |
SInt16 whatPart; |
SInt32 menuResult; |
WindowRef whichWindow; |
SInt8 theKey; |
SInt8 theCode; |
Boolean fProcessed; |
if (WaitNextEvent(everyEvent, &theEvent, gSleepTime, NULL)) |
{ |
DSpProcessEvent (&theEvent, &fProcessed); |
if (!fProcessed) |
{ |
switch (theEvent.what) |
{ |
case mouseDown: |
whatPart = FindWindow(theEvent.where, &whichWindow); |
switch (whatPart) |
{ |
case inGoAway: |
break; |
case inMenuBar: |
DrawMenuBar(); |
menuResult = MenuSelect(theEvent.where); |
if (HiWord(menuResult) != 0) |
DoMenu(menuResult); |
break; |
case inSysWindow: |
SystemClick(&theEvent, whichWindow); |
break; |
case inContent: |
break; |
} |
break; |
case keyDown: |
case autoKey: |
theKey = (char)(theEvent.message & charCodeMask); |
theCode = (char)((theEvent.message & keyCodeMask) >> 8); |
if ((theEvent.modifiers & cmdKey) != 0) |
{ |
menuResult = MenuKey(theKey); |
if (HiWord(menuResult) != 0) |
DoMenu (menuResult); |
} |
else |
DoKey (theKey, theCode); |
break; |
case updateEvt: |
BeginUpdate((WindowRef) theEvent.message); |
DoUpdate(); |
EndUpdate((WindowRef) theEvent.message); |
break; |
case diskEvt: |
break; |
case osEvt: |
if (theEvent.message & 0x01000000) // Suspend/resume event |
{ |
if (theEvent.message & 0x00000001) // Resume |
{ |
gSleepTime = 1; // Suspend |
DoUpdate (); |
} |
else |
gSleepTime = 32000; // Suspend |
} |
break; |
case kHighLevelEvent: |
AEProcessAppleEvent(&theEvent); |
break; |
} |
} |
} |
else |
{ |
// idle tasks |
} |
} |
// -------------------------------------------------------------------------- |
void CleanUp (void) |
{ |
OSStatus err; |
err = DSpContext_FadeGammaOut (NULL, NULL); // remove for debug |
if (err != noErr) |
DebugStr("\pUnable to fade the display!"); |
err = DSpContext_SetState (gaContextRef [gContextCurrent], kDSpContextState_Inactive); |
if (err != noErr) |
DebugStr("\pUnable to set the display!"); |
err = DSpContext_FadeGammaIn (NULL, NULL); |
if(err) |
DebugStr("\pUnable to fade the display!"); |
if (false == gfDSp17) |
{ |
err = DSpContext_Release (gaContextRef [gContextCurrent]); |
if (err != noErr) |
DebugStr ("\pDSpContext_Release error"); |
while (gnumDevices--) // dump our reserved unused devices |
{ |
err = DSpContext_Release (gpContextRefUnused [gnumDevices]); |
if (err != noErr) |
DebugStr ("\pDSpContext_Release error"); |
} |
} |
else |
{ |
err = DSpContext_Release (gaContextRef [0]); |
if (err != noErr) |
DebugStr ("\pDSpContext_Release error"); |
} |
err = DSpShutdown (); |
if (err != noErr) |
DebugStr ("\pDSpShutdown error"); |
} |
// -------------------------------------------------------------------------- |
int main (void) |
{ |
if (SetUp ()) |
{ |
DoUpdate (); |
while (!gDone) |
{ |
DoEvent (); |
} |
} |
CleanUp (); |
return 0; |
} |
Copyright © 2003 Apple Computer, Inc. All Rights Reserved. Terms of Use | Privacy Policy | Updated: 2003-10-14