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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.

AGLSurfaceTexture.c

/*

    File:       AGLSurfaceTexture.c

    Contains:   An example of the use of surface texturing from AGL

    Written by: ggs

    Copyright:  2000-2002 Apple Computer, Inc., All Rights Reserved

    Change History (most recent first):

    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

                OF THE APPLE SOFTWARE, HOWEVER CAUSED AND WHETHER UNDER THEORY OF CONTRACT, TORT

                (INCLUDING NEGLIGENCE), STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN

                ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

*/

// NOTE: Requires Mac OS X 10.2

// system includes ----------------------------------------------------------

#include <math.h>

#include <stdio.h>

#include <string.h>

#if defined (__APPLE_CC__)

    #include <AGL/agl.h>

    #include <OpenGL/gl.h>

    #include <OpenGL/glu.h>

    #include <OpenGL/glext.h>

#else

    #include <agl.h>

    #include <gl.h>

    #include <glu.h>

    #include <glext.h>

#endif

#include "stanfordbunny.h"

// project includes ---------------------------------------------------------

// prototypes ---------------------------------------------------------------

static void CToPStr (StringPtr outString, const char *inString);

static void ReportError (char * strError);

static GLenum aglDebugStr (void);

static GLenum glDebugStr (void);

static void DrawCube (GLfloat fSize, GLint texWidth, GLint texHeight);

static AGLContext SetupAGL (WindowRef win);

static void CleanupAGL (AGLContext ctx);

static void DrawGL(WindowPtr pWindow, AGLContext gDestContext);

void InitToolbox(void);

Boolean SetUp (void);

void DoMenu (SInt32 menuResult);

void DoKey (SInt8 theKey, SInt8 theCode);

void DoUpdate (WindowPtr pWindow);

pascal void IdleTimer (EventLoopTimerRef inTimer, void* userData);

EventLoopTimerUPP GetTimerUPP (void);

void DoEvent (void);

void CleanUp (void);

// statics/globals (internal only) ------------------------------------------

// Menu defs

enum

    kMenuApple = 128,

    kMenuFile = 129,

    kAppleAbout = 1,

    kFileShowHideST = 1,

    kFileQuit = 2

};

enum

    kForegroundSleep = 10,

    kBackgroundSleep = 10000

};

EventLoopTimerRef gTimer = NULL;

enum

    kTextureSize = 256

};

SInt32 gSleepTime = kForegroundSleep;

Boolean gDone = false, gfFrontProcess = true;

Boolean gRectTexture = false;

AGLContext gSurfaceTextureContext = 0;

GLint gSurfaceTexName = 0;

WindowPtr gSurfaceTextureWindowPtr = NULL;

AGLContext gDestContext = 0;

WindowPtr gDestWindowPtr = NULL;

GLboolean gLines = GL_FALSE;

GLboolean gPolygons = GL_TRUE;

// simple cube data

GLint cube_num_vertices = 8;

GLfloat cube_vertices [8][3] = {

{1.0, 1.0, 1.0}, {1.0, -1.0, 1.0}, {-1.0, -1.0, 1.0}, {-1.0, 1.0, 1.0},

{1.0, 1.0, -1.0}, {1.0, -1.0, -1.0}, {-1.0, -1.0, -1.0}, {-1.0, 1.0, -1.0} };

GLint num_faces = 6;

short cube_faces [6][4] = {

{3, 2, 1, 0}, {2, 3, 7, 6}, {0, 1, 5, 4}, {3, 0, 4, 7}, {1, 2, 6, 5}, {4, 5, 6, 7} };

short cube_texCoords [2][4] = {

{0.0, 0.0, 1.0, 1.0}, {0.0, 1.0, 1.0, 0.0} };

GLuint gBunnyWireList = NULL;

GLuint gBunnySolidList = NULL;

GLboolean gBunnyLines = GL_FALSE;

// functions (internal/private) ---------------------------------------------

// Copy C string to Pascal string

static void CToPStr (StringPtr outString, const char *inString)

    unsigned char x = 0;

    do {

        *(((char*)outString) + x + 1) = *(inString + x); x++;

    } while ((*(inString + x) != 0)  && (x < 256));

    *((char*)outString) = (char) x;

// --------------------------------------------------------------------------

static void ReportError (char * strError)

    char errMsgCStr [256];

    Str255 strErr;

    sprintf (errMsgCStr, "%s", strError);

    // out as debug string

    CToPStr (strErr, errMsgCStr);

    DebugStr (strErr);

//-----------------------------------------------------------------------------------------------------------------------

// if error dump agl errors to debugger string, return error

static GLenum aglDebugStr (void)

    GLenum err = aglGetError();

    if (AGL_NO_ERROR != err)

        ReportError ((char *)aglErrorString(err));

    return err;

//---------------------------------------------------------------------------

// if error dump agl errors to debugger string, return error

static GLenum glDebugStr (void)

    GLenum err = glGetError();

    if (GL_NO_ERROR != err)

        ReportError ((char *) gluErrorString(err));

    return err;

// --------------------------------------------------------------------------

static void DrawCube (GLfloat fSize, GLint texWidth, GLint texHeight)

    long f, i;

    if (gPolygons)

        glBegin (GL_QUADS);

        for (f = 0; f < num_faces; f++)

            for (i = 0; i < 4; i++)

                glVertex3f(cube_vertices[cube_faces[f][i]][0] * fSize, cube_vertices[cube_faces[f][i]][1] * fSize, cube_vertices[cube_faces[f][i]][2] * fSize);

                glTexCoord2i (cube_texCoords [0][i] * (gRectTexture ? texWidth : 1.0f),

                              cube_texCoords [1][i] * (gRectTexture ? texHeight : 1.0f));

        glEnd ();

    if (gLines)

        glDisable(gRectTexture ? GL_TEXTURE_RECTANGLE_EXT : GL_TEXTURE_2D);

        glColor3f (0.0, 1.0, 1.0);

        for (f = 0; f < num_faces; f++)

            glBegin (GL_LINE_LOOP);

                for (i = 0; i < 4; i++)

                    glVertex3f(cube_vertices[cube_faces[f][i]][0] * fSize, cube_vertices[cube_faces[f][i]][1] * fSize, cube_vertices[cube_faces[f][i]][2] * fSize);

            glEnd ();

//---------------------------------------------------------------------------

void SetLighting(void)

    GLfloat mat_ambient[] = {0.329412, 0.223529, 0.027451, 1.0};

    GLfloat mat_diffuse[] = {0.780392, 0.568627, 0.113725, 1.0};

    GLfloat mat_specular[] = {0.992157, 0.941176, 0.807843, 1.0};

    GLfloat mat_shininess[] = {27.8974};

    GLfloat position[4] = {7.0,-7.0,12.0,0.0};

    GLfloat ambient[4]  = {0.2,0.2,0.2,1.0};

    GLfloat diffuse[4]  = {0.9,0.9,0.9,1.0};

    GLfloat specular[4] = {1.0,1.0,1.0,1.0};

    glMaterialfv (GL_FRONT, GL_AMBIENT, mat_ambient);

    glMaterialfv (GL_FRONT, GL_DIFFUSE, mat_diffuse);

    glMaterialfv (GL_FRONT, GL_SPECULAR, mat_specular);

    glMaterialfv (GL_FRONT, GL_SHININESS, mat_shininess);

    glLightfv(GL_LIGHT0,GL_POSITION,position);

    glLightfv(GL_LIGHT0,GL_AMBIENT,ambient);

    glLightfv(GL_LIGHT0,GL_DIFFUSE,diffuse);

    glLightfv(GL_LIGHT0,GL_SPECULAR,specular);

    glEnable(GL_LIGHT0);

#pragma mark -

//-----------------------------------------------------------------------------------------------------------------------

#pragma mark --- AGL Setup Code ---

// OpenGL Simple Setup

static AGLContext SetupAGL (WindowRef win)

    GLint          attrib[] = { AGL_RGBA, AGL_DOUBLEBUFFER, AGL_DEPTH_SIZE, 16, AGL_NONE };

    AGLPixelFormat  fmt;

    AGLContext      ctx;

    short fNum;

    if ((Ptr) kUnresolvedCFragSymbolAddress == (Ptr) aglChoosePixelFormat) // check for existance of OpenGL

        ReportError("OpenGL not installed");

        return NULL;

    fmt = aglChoosePixelFormat(NULL, 0, attrib);            // get an appropriate pixel format

    aglDebugStr ();

    if (NULL == fmt)

        ReportError("Could not find valid pixel format");

        return NULL;

    ctx = aglCreateContext (fmt, NULL);                         // Create an AGL context

    aglDebugStr ();

    if (NULL == ctx)

        ReportError ("Could not create context");

        return NULL;

    if (!aglSetDrawable (ctx, GetWindowPort (win)))                             // attach the CGrafPtr to the context

        aglDebugStr ();

    else if (!aglSetCurrentContext (ctx))                       // make the context the current context

        aglDebugStr ();

        aglSetDrawable (ctx, NULL);

    aglDestroyPixelFormat(fmt);                                 // pixel format is no longer needed

    { // set up viewport and projection

        GLfloat fAspect;

        short w, h;

        Rect rectPort;

        GetWindowPortBounds(win, &rectPort);

        w = rectPort.right - rectPort.left;

        h = rectPort.bottom - rectPort.top;

        // Prevent a divide by zero

        if(h == 0)

            h = 1;

        fAspect = (GLfloat) w / (GLfloat) h;

        // Set Viewport to window dimensions

        glViewport (0, 0, (GLsizei) w, (GLsizei) h);

        glMatrixMode (GL_PROJECTION);

        // Reset coordinate system

        glLoadIdentity ();

        // Setup perspective for viewing

        gluPerspective (45.0, fAspect, 0.1, 15);

        glDebugStr (); // check for errors

    { // do we have rectangular textures

        const GLubyte * strExtension = glGetString (GL_EXTENSIONS); // get extension string

        gRectTexture = (NULL != strstr ((const char *) strExtension, "GL_EXT_texture_rectangle"));

        glDebugStr (); // check for errors

    // initial GL settings

    glShadeModel (GL_SMOOTH);

    glEnable(GL_DEPTH_TEST);    // Hidden surface removal

    glEnable(GL_CULL_FACE); // Do not draw inside of cube

    glFrontFace(GL_CCW);    // Counter clock-wise polygons face out

    gBunnySolidList = GenStanfordBunnySolidList ();

    gBunnyWireList = GenStanfordBunnyWireList ();

    glPolygonOffset (1.0,1.0);

    glEnable(GL_POLYGON_OFFSET_FILL);

    glClearColor (0.2f, 0.2f, 0.4f, 1.0f);

    glPointSize (3.0);

    glDebugStr (); // check for errors

    GetFNum("\pMonaco", &fNum);                                 // build font

    return ctx;

//-----------------------------------------------------------------------------------------------------------------------

// OpenGL Cleanup

static void CleanupAGL(AGLContext ctx)

    aglSetCurrentContext (ctx);

    aglSetDrawable(ctx, NULL);

    aglSetCurrentContext(NULL);

    aglDestroyContext(ctx);

    aglDebugStr (); // check for errors

//-----------------------------------------------------------------------------------------------------------------------

// OpenGL Drawing

static void DrawGL(WindowPtr pWindow, AGLContext aglContext)

    static GLfloat fRot [3] = { 0.0, 0.0, 0.0 };

    static GLfloat fVel [3] = { 0.3, 0.1, 0.2 };

    static GLfloat fAccel [3] = { 0.003, -0.005, 0.004 };

    GLfloat fVMax = 1.0;

    short i;

    if (!pWindow || !aglContext)

        return;

    // do spin velocities

    for (i = 0; i < 3; i++)

        fVel[i] += fAccel[i];

        if (fVel[i] > fVMax)

            fAccel[i] *= -1.0;

            fVel[i] = fVMax;

        else if (fVel[i] < -fVMax)

            fAccel[i] *= -1.0;

            fVel[i] = -fVMax;

        fRot[i] += fVel[i];

        while (fRot[i] > 360.0)

            fRot[i] -= 360.0;

        while (fRot[i] < -360.0)

            fRot[i] += 360.0;

    aglSetCurrentContext (aglContext);

    glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    // Viewing transformation

    glMatrixMode(GL_MODELVIEW);

    glLoadIdentity();

    if (pWindow == gSurfaceTextureWindowPtr) // if we are drawing the source for the surface texture

        glTranslatef(0.0, 0.0, -2.0);

    else if (pWindow == gDestWindowPtr)

        glTranslatef(0.0, 0.0, -8.0);

    glRotatef (fRot[0], 1.0, 0.0, 0.0);

    glRotatef (fRot[1], 0.0, 1.0, 0.0);

    glRotatef (fRot[2], 0.0, 0.0, 1.0);

    glDebugStr (); // check for errors

#pragma mark --- Drawing Code ---

    // determine whether we are rendering to the source texture or the destination window

    if (pWindow == gSurfaceTextureWindowPtr) { // if we are drawing the source for the surface texture

        // fill surface texture, this could be any GL content...

        glClearColor (0.2f, 0.2f, 0.4f, 1.0f);  // clear the surface

        glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

        glDisable(gRectTexture ? GL_TEXTURE_RECTANGLE_EXT : GL_TEXTURE_2D); // disable texturing

        glDebugStr (); // check for errors

        glEnable(GL_LIGHTING);

        glCallList (gBunnySolidList);

        glDebugStr (); // check for errors

    } else if (pWindow == gDestWindowPtr) {

        // draw destination content using surface texture

        // clear buffer

        glClearColor (0.2f, 0.2f, 0.2f, 1.0f);

        glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

        // enable surface texturing

        if (gSurfaceTextureContext) {

            glEnable(gRectTexture ? GL_TEXTURE_RECTANGLE_EXT : GL_TEXTURE_2D); // enable texturing

#pragma mark === aglSurfaceTexture ===

            if (0 == gSurfaceTexName) {

                glGenTextures (1, &gSurfaceTexName);

                glBindTexture (gRectTexture ? GL_TEXTURE_RECTANGLE_EXT : GL_TEXTURE_2D, gSurfaceTexName);

                glTexParameterf (gRectTexture ? GL_TEXTURE_RECTANGLE_EXT : GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);

                aglSurfaceTexture (gDestContext, gRectTexture ? GL_TEXTURE_RECTANGLE_EXT : GL_TEXTURE_2D, GL_RGBA8, gSurfaceTextureContext); // draw with surface texture

            } else {

                glBindTexture (gRectTexture ? GL_TEXTURE_RECTANGLE_EXT : GL_TEXTURE_2D, gSurfaceTexName);

            glColor3f (1.0, 1.0, 1.0); // no coloring

        } else { // disable if no surface texture context

            glDisable(gRectTexture ? GL_TEXTURE_RECTANGLE_EXT : GL_TEXTURE_2D);

            glColor3f (0.8f, 0.1f, 0.1f); // red cube

            glDebugStr (); // check for errors

        gLines = true; // draw edges

        DrawCube(2.0, kTextureSize, kTextureSize); // draw a cube with the faces textured with surface texture

        glDebugStr (); // check for errors

    glBindTexture (gRectTexture ? GL_TEXTURE_RECTANGLE_EXT : GL_TEXTURE_2D, 0); // unbind from the pbuffer (stability fix for pre-release Panther)

    aglSwapBuffers(aglContext); // send swap command

    aglDebugStr (); // check for errors

#pragma mark -

// --------------------------------------------------------------------------

// super basic toolbox stuff

static pascal OSErr QuitAppleEventHandler( const AppleEvent *appleEvt, AppleEvent* reply, SInt32 refcon )

    #pragma unused (appleEvt, reply, refcon)

    gDone =  true;

    return false;

//-----------------------------------------------------------------------------------------------------------------------

void InitToolbox(void)

    MenuHandle menu;

    long response;

    OSStatus err;

    InitCursor();

    // Init Menus

    menu = NewMenu (kMenuApple, "\p\024");          // new  apple menu

    InsertMenu (menu, 0);                           // add menu to end

    menu = NewMenu (kMenuFile, "\pFile");           // new menu

    InsertMenu (menu, 0);                           // add menu to end

    AppendMenu (menu, "\pShow Hide Surface Texture/S"); // add show/hide surface texture

    // add quit if not under Mac OS X

    err = Gestalt (gestaltMenuMgrAttr, &response);

    if ((err == noErr) && !(response & gestaltMenuMgrAquaLayoutMask))

            AppendMenu (menu, "\pQuit/Q");                  // add quit

    DrawMenuBar();

        err = AEInstallEventHandler( kCoreEventClass, kAEQuitApplication, NewAEEventHandlerUPP(QuitAppleEventHandler), 0, false );

        if (err != noErr)

            ExitToShell();

    DrawMenuBar();

// --------------------------------------------------------------------------

Boolean SetUp (void)

    InitToolbox ();

#pragma mark --- Window Setup Code ---

        // build surface texture window (ensure size is compatible with texture mode

        Rect rectWin = {100, 100, 100 + kTextureSize, 100 + kTextureSize};

        gSurfaceTextureWindowPtr = (WindowPtr) NewCWindow (NULL, &rectWin, "\pSource Surface", true, kWindowDocumentProc, (WindowPtr)-1, 0, 0);

        gSurfaceTextureContext = SetupAGL (gSurfaceTextureWindowPtr);

        SetLighting();

        glEnable(GL_LIGHTING);

        DoUpdate (gSurfaceTextureWindowPtr); // force off screen surface texture window to update

        // build destination windwo

        rectWin.left = rectWin.right + 50;

        rectWin.right = rectWin.left + 600;

        rectWin.bottom = rectWin.top + 600;

        gDestWindowPtr = (WindowPtr) NewCWindow (NULL, &rectWin, "\pTarget", true, kWindowFullZoomGrowDocumentProc, (WindowPtr)-1, 0, 0);

        gDestContext = SetupAGL (gDestWindowPtr);

        // ensure the windows animate (max 100 fps)

        InstallEventLoopTimer (GetCurrentEventLoop(), 0, 0.01, GetTimerUPP (), 0, &gTimer);

    return true;

// --------------------------------------------------------------------------

void DoMenu (SInt32 menuResult)

    SInt16 theMenu;

    SInt16 theItem;

    MenuRef theMenuHandle;

    theMenu = HiWord(menuResult);

    theItem = LoWord(menuResult);

    theMenuHandle = GetMenuHandle(theMenu);

    switch (theMenu)

        case kMenuApple:

            switch (theItem)

                case kAppleAbout:

                    break;

                default:

                    break;

            break;

        case kMenuFile:

            switch (theItem)

                case kFileShowHideST:

                    ShowHide (gSurfaceTextureWindowPtr, !MacIsWindowVisible (gSurfaceTextureWindowPtr));

                    break;

                case kFileQuit:

                    gDone = true;

                    break;

            break;

    HiliteMenu(0);

    DrawMenuBar();

// --------------------------------------------------------------------------

void DoKey (SInt8 theKey, SInt8 theCode)

    #pragma unused (theCode, theKey)

    // do nothing

// --------------------------------------------------------------------------

void DoUpdate (WindowPtr pWindow)

    #pragma unused (pWindow)

#pragma mark --- Update Code ---

    // update the surafce texture

    if ((pWindow == gSurfaceTextureWindowPtr) && gSurfaceTextureContext)

        DrawGL (pWindow, gSurfaceTextureContext);

    // update the destiantion window (these do not have to linked but for simplicity they are in this case)

    if ((pWindow == gDestWindowPtr) && gDestContext)

        DrawGL (pWindow, gDestContext);

// --------------------------------------------------------------------------

pascal void IdleTimer (EventLoopTimerRef inTimer, void* userData)

    #pragma unused (inTimer, userData)

    DoUpdate (gSurfaceTextureWindowPtr);

    DoUpdate (gDestWindowPtr);

// --------------------------------------------------------------------------

EventLoopTimerUPP GetTimerUPP (void)

    static EventLoopTimerUPP    sTimerUPP = NULL;

    if (sTimerUPP == NULL)

        sTimerUPP = NewEventLoopTimerUPP (IdleTimer);

    return sTimerUPP;

// --------------------------------------------------------------------------

void DoEvent (void)

    EventRecord theEvent;

    Rect rectGrow;

    SInt32 menuResult;

    WindowRef whichWindow = NULL;

    GrafPtr pGrafSave;

    long grow;

    SInt16 whatPart;

    SInt8 theKey;

    SInt8 theCode;

    if (WaitNextEvent(everyEvent, &theEvent, gSleepTime, NULL)) {

        switch (theEvent.what) {

            case mouseDown:

                whatPart = FindWindow(theEvent.where, &whichWindow);

                if (whichWindow != NULL)

                    SelectWindow (whichWindow);

                switch (whatPart) {

                    case inGoAway:

                        break;

                    case inMenuBar:

                        DrawMenuBar();

                        menuResult = MenuSelect(theEvent.where);

                        if (HiWord(menuResult) != 0)

                            DoMenu(menuResult);

                        break;

                    case inDrag: {

                            BitMap  screenBits;

                            DragWindow(whichWindow, theEvent.where, &GetQDGlobalsScreenBits(&screenBits)->bounds);

                        if (gSurfaceTextureWindowPtr == whichWindow)

                            aglUpdateContext (gSurfaceTextureContext);

                        if (gDestWindowPtr == whichWindow)

                            aglUpdateContext (gDestContext);

                        break;

                    case inGrow: {

                        if (whichWindow == gDestWindowPtr) {

                            SetRect (&rectGrow, 100, 100, 20000, 20000);

                            grow = GrowWindow (whichWindow, theEvent.where, &rectGrow);

                            if (grow) {

                                Rect tempRect;

                                SizeWindow (whichWindow, grow & 0x0000FFFF, grow >> 16, true);

                                // do content stuff here

                                SetPort((GrafPtr) GetWindowPort(whichWindow));

                                InvalWindowRect(whichWindow, GetWindowPortBounds(whichWindow, &tempRect));

                                    // handle window size updates for GL

                                    GLfloat fAspect;

                                    short w, h;

                                    Rect rectPort;

                                    aglSetCurrentContext (gDestContext);

                                    aglUpdateContext (gDestContext);

                                    GetWindowPortBounds(whichWindow, &rectPort);

                                    w = rectPort.right - rectPort.left;

                                    h = rectPort.bottom - rectPort.top;

                                    // Prevent a divide by zero

                                    if(h == 0)

                                        h = 1;

                                    fAspect = (GLfloat) w / (GLfloat) h;

                                    // Set Viewport to window dimensions

                                    glViewport (0, 0, (GLsizei) w, (GLsizei) h);

                                    glMatrixMode (GL_PROJECTION);

                                    // Reset coordinate system

                                    glLoadIdentity ();

                                    // Setup perspective for viewing

                                    gluPerspective (45.0, fAspect, 3, 20);

                        break;

                break;

            case keyDown:

            case autoKey:

                theKey = theEvent.message & charCodeMask;

                theCode = (theEvent.message & keyCodeMask) >> 8;

                if ((theEvent.modifiers & cmdKey) != 0) {

                    menuResult = MenuKey(theKey);

                    if (HiWord(menuResult) != 0)

                        DoMenu (menuResult);

                } else

                    DoKey (theKey, theCode);

                break;

            case activateEvt:

                break;

            case updateEvt:

                whichWindow = (WindowRef) theEvent.message;

                GetPort (&pGrafSave);

                SetPort ((GrafPtr) whichWindow);

                BeginUpdate(whichWindow);

                DoUpdate(whichWindow);

                SetPort ((GrafPtr) whichWindow);

                EndUpdate(whichWindow);

                SetPort (pGrafSave);

                break;

            case diskEvt:

                break;

            case osEvt:

                if (theEvent.message & 0x01000000)  {   //  Suspend/resume event

                    if (theEvent.message & 0x00000001) {    //  Resume

                        gSleepTime = kForegroundSleep;

                        if (gDestWindowPtr)

                            DoUpdate (gDestWindowPtr);

                        if (gSurfaceTextureWindowPtr)

                            DoUpdate (gSurfaceTextureWindowPtr);

                        gfFrontProcess = true;

                    } else {

                        gSleepTime = kBackgroundSleep;  //  Suspend

                        gfFrontProcess = false;

                break;

            case kHighLevelEvent:

                AEProcessAppleEvent(&theEvent);

                break;

// --------------------------------------------------------------------------

void CleanUp (void)

    MenuHandle hMenu;

    RemoveEventLoopTimer(gTimer);

    gTimer = NULL;

    // ensure surface texture is not being used on exit

    aglSetCurrentContext (gDestContext);

    if (gSurfaceTexName)

        glDeleteTextures (1, &gSurfaceTexName);

    glFlush ();

    CleanupAGL (gSurfaceTextureContext);

    gSurfaceTextureContext = NULL;

    CleanupAGL (gDestContext);

    gDestContext = NULL;

    if (gSurfaceTextureWindowPtr)

        DisposeWindow ((WindowPtr) gSurfaceTextureWindowPtr);

    gSurfaceTextureWindowPtr = NULL;

    if (gDestWindowPtr)

        DisposeWindow ((WindowPtr) gDestWindowPtr);

    gDestWindowPtr = NULL;

    hMenu = GetMenuHandle (kMenuFile);

    DeleteMenu (kMenuFile);

    DisposeMenu (hMenu);

    hMenu = GetMenuHandle (kMenuApple);

    DeleteMenu (kMenuApple);

    DisposeMenu (hMenu);

// --------------------------------------------------------------------------

int main (void)

    UInt32 response;

    if ((Gestalt (gestaltSystemVersion, (SInt32 *) &response) == noErr) && (response < 0x01020)) {

        ReportError ("Must have Mac OS v10.2 or later to use aglSurfaceTexture");

        return 1;

    } else {

        if (SetUp ())

            while (!gDone)

                DoEvent ();

        CleanUp ();

        return 0;

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