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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
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<h2>/Classes/OpenGL/View/OpenGLViewKit.m</h2>
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<p><strong><a href="QTCoreVideo103.zip">Download Sample</a></strong> (“QTCoreVideo103.zip”, 969.8K)<BR>
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<pre class="sourcecodebox">//---------------------------------------------------------------------------
//
// File: OpenGLViewKit.m
//
// Abstract: OpenGL glView base class
//
// 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 Apple's 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.
//
// Copyright (c) 2008 Apple Inc., All rights reserved.
//
//---------------------------------------------------------------------------
//---------------------------------------------------------------------------
#import "AlertPanelKit.h"
#import "OpenGLViewKit.h"
//---------------------------------------------------------------------------
//---------------------------------------------------------------------------
static const GLdouble kViewRotationDegreesPerSecond = 20.0;
//---------------------------------------------------------------------------
//---------------------------------------------------------------------------
struct OpenGLViewAttributes
{
GLfloat offset; // delta change
GLfloat zoom; // zoom used for animation
GLfloat angle; // angle used for animation
GLfloat pitch; // pitch used for animation
GLdouble lastFrameReferenceTime; // used to compute change in time
BOOL leftMouseIsDown; // was the left mouse button pressed?
BOOL rightMouseIsDown; // was the right mouse button pressed?
NSPoint lastMousePoint; // last place the mouse was
};
typedef struct OpenGLViewAttributes OpenGLViewAttributes;
//---------------------------------------------------------------------------
//---------------------------------------------------------------------------
#pragma mark
//---------------------------------------------------------------------------
//---------------------------------------------------------------------------
@implementation OpenGLViewKit
//---------------------------------------------------------------------------
#pragma mark -- Prepare the OpenGL View --
//---------------------------------------------------------------------------
- (void) prepareOpenGLMTEngine
{
CGLError cglError = kCGLNoError;
CGLContextObj cglContext = CGLGetCurrentContext( );
// Enable the multi-threaded OpenGL engine
cglError = CGLEnable( cglContext, kCGLCEMPEngine );
if ( cglError != kCGLNoError )
{
// Multi-threaded execution is possibly not available
// so what was the returned CGL error?
[[AlertPanelKit withTitle:@"OpenGL View Kit"
message:@"Initializing multi-threaded OpenGL Engine"
exit:NO] displayAlertPanelWithError:cglError];
} // if
} // prepareOpenGLMTEngine
//---------------------------------------------------------------------------
- (void) prepareOpenGLStates
{
glEnable(GL_COLOR_MATERIAL);
glColorMaterial(GL_FRONT_AND_BACK,GL_AMBIENT_AND_DIFFUSE);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
glShadeModel( GL_SMOOTH ); // enable smooth shading
glEnable( GL_DEPTH_TEST ); // enable depth testing
glDisable( GL_LIGHTING );
glClearColor( 0.0f, 0.0f, 0.0f, 0.0f ); // black background
glClearStencil( 0 ); // clear stencil image
glClearDepth( 1.0f ); // 0 is near, 1 is far
glDepthFunc( GL_LEQUAL ); // type of depth test to do
// For some OpenGL implementations, glAttribs.texture coordinates generated
// during rasterization aren't perspective correct. However, you
// can usually make them perspective correct by calling the API
// glHint(GL_PERSPECTIVE_CORRECTION_HINT,GL_NICEST). Colors
// generated at the rasterization stage aren't perspective correct
// in almost every OpenGL implementation, / and can't be made so.
// For this reason, you're more likely to encounter this problem
// with colors than glAttribs.texture coordinates.
glHint( GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST );
} // prepareOpenGLStates
//---------------------------------------------------------------------------
//
// Set up the GL contexts swap interval -- passing 1 means that the buffers
// are swapped only during the vertical retrace of the monitor.
//
//---------------------------------------------------------------------------
- (void) prepareOpenGLSwapInterval
{
GLint swapInterval = 1;
[[self openGLContext] setValues:&swapInterval forParameter:NSOpenGLCPSwapInterval];
} // prepareOpenGLSwapInterval
//---------------------------------------------------------------------------
//
// Set up the OpenGL environment
//
//---------------------------------------------------------------------------
- (void) prepareOpenGLView
{
[self prepareOpenGLMTEngine];
[self prepareOpenGLSwapInterval];
[self prepareOpenGLStates];
} // prepareOpenGL
//---------------------------------------------------------------------------
//
// Initialize
//
//---------------------------------------------------------------------------
- (void) prepareOpenGL
{
glViewMemObj = [[MemObject alloc] initMemoryWithType:kMemAlloc size:sizeof(OpenGLViewAttributes)];
if ( glViewMemObj )
{
glView = (OpenGLViewAttributesRef)[glViewMemObj pointer];
if ( [glViewMemObj isPointerValid] )
{
glView->lastMousePoint.x = 0.0f;
glView->lastMousePoint.y = 0.0f;
glView->lastFrameReferenceTime = -1.0;
glView->leftMouseIsDown = NO;
glView->rightMouseIsDown = NO;
glView->angle = 0.0f;
glView->pitch = 0.0f;
glView->zoom = 1.0f;
[self prepareOpenGLView];
} // if
else
{
[[AlertPanelKit withTitle:@"OpenGL View Kit"
message:@"Failure Allocating Memory For OpenGL View Attributes"
exit:YES] displayAlertPanel];
} // else
} // if
} // prepareOpenGL
//---------------------------------------------------------------------------
#pragma mark -- Cleanup all the Resources --
//---------------------------------------------------------------------------
- (void) dealloc
{
if ( glViewMemObj )
{
[glViewMemObj release];
glViewMemObj = nil;
} // if
[super dealloc];
} // dealloc
//---------------------------------------------------------------------------
#pragma mark -- Basic Setup for OpenGL Drawing --
//---------------------------------------------------------------------------
- (void) setupPrespectiveMatrix:(GLfloat)theWidth
boundsHeight:(GLfloat)theHeight
scaleFactor:(GLfloat)theScaleFactor
{
GLdouble aspect = theWidth / theHeight;
GLdouble right = theScaleFactor * aspect * glView->zoom;
GLdouble left = -right;
GLdouble top = theScaleFactor * glView->zoom;
GLdouble bottom = -top;
GLdouble zNear = 1.0;
GLdouble zFar = 10.0;
glMatrixMode( GL_PROJECTION );
glLoadIdentity( );
glFrustum( left, right, bottom, top, zNear, zFar );
glMatrixMode( GL_MODELVIEW );
} // setupPrespectiveMatrix
//------------------------------------------------------------------------
- (void) setupViewport:(GLfloat)theScaleFactor
{
NSRect theBounds = [self bounds];
GLfloat theWidth = NSWidth( theBounds );
GLfloat theHeight = NSHeight( theBounds );
[self setupPrespectiveMatrix:theWidth
boundsHeight:theHeight
scaleFactor:theScaleFactor];
glViewport( 0, 0, theWidth, theHeight );
} // setupViewport
//---------------------------------------------------------------------------
- (void) setupView:(GLfloat)theScaleFactor
{
[self setupViewport:theScaleFactor];
glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT );
glMatrixMode( GL_TEXTURE );
glLoadIdentity( );
glMatrixMode( GL_MODELVIEW );
glLoadIdentity( );
glTranslatef( 0.0f, 0.0f, -3.0f );
} // drawSetup
//---------------------------------------------------------------------------
#pragma mark -- Set Angle & Pitch --
//---------------------------------------------------------------------------
- (GLdouble) updateChangeInTime
{
GLdouble timeDelta = 0.0;
GLdouble timeNow = (GLdouble)[NSDate timeIntervalSinceReferenceDate];
if ( glView->lastFrameReferenceTime < 0 )
{
timeDelta = 0;
} // if
else
{
timeDelta = timeNow - glView->lastFrameReferenceTime;
} // else
glView->lastFrameReferenceTime = timeNow;
return timeDelta;
} // updateChangeInTime
//------------------------------------------------------------------------
- (void) updatePitch
{
if ( glView->pitch < -45.0f )
{
glView->pitch = -45.0f;
} // if
else if ( glView->pitch > 90.0f )
{
glView->pitch = 90.0f;
} // else if
glRotatef( glView->pitch, 1.0f, 0.0f, 0.0f );
} // updatePitch
//------------------------------------------------------------------------
- (void) updateAngle
{
if ( !glView->leftMouseIsDown && !glView->rightMouseIsDown )
{
GLdouble timeDelta = [self updateChangeInTime];
glView->angle += kViewRotationDegreesPerSecond * timeDelta;
if ( glView->angle >= 360.0f )
{
glView->angle -= 360.0f;
} // if
} // if
glRotatef( glView->angle, 0.0f, 1.0f, 0.0f );
// Increment the rotation angle
glView->angle += 0.2f;
} // updateAngle
//------------------------------------------------------------------------
#pragma mark -- Handling mouse events --
//------------------------------------------------------------------------
- (void)mouseDown:(NSEvent *)theEvent
{
glView->lastMousePoint = [self convertPoint:[theEvent locationInWindow] fromView:nil];
glView->leftMouseIsDown = YES;
} // mouseDown
//------------------------------------------------------------------------
- (void)rightMouseDown:(NSEvent *)theEvent
{
glView->lastMousePoint = [self convertPoint:[theEvent locationInWindow] fromView:nil];
glView->rightMouseIsDown = YES;
} // rightMouseDown
//------------------------------------------------------------------------
- (void)mouseUp:(NSEvent *)theEvent
{
glView->leftMouseIsDown = NO;
} // mouseUp
//------------------------------------------------------------------------
- (void)rightMouseUp:(NSEvent *)theEvent
{
glView->rightMouseIsDown = NO;
} // rightMouseUp
//------------------------------------------------------------------------
- (void)mouseDragged:(NSEvent *)theEvent
{
if ( [theEvent modifierFlags] & NSRightMouseDown )
{
[self rightMouseDragged:theEvent];
} // if
else
{
NSPoint mouse = [self convertPoint:[theEvent locationInWindow] fromView:nil];
glView->pitch += glView->lastMousePoint.y - mouse.y;
glView->angle -= glView->lastMousePoint.x - mouse.x;
glView->lastMousePoint = mouse;
} // else
} // mouseDragged
//------------------------------------------------------------------------
- (void)rightMouseDragged:(NSEvent *)theEvent
{
NSPoint mouse = [self convertPoint:[theEvent locationInWindow] fromView:nil];
glView->zoom += 0.01f * ( glView->lastMousePoint.y - mouse.y );
if ( glView->zoom < 0.05f )
{
glView->zoom = 0.05f;
} // if
else if ( glView->zoom > 2.0f )
{
glView->zoom = 2.0f;
} // else if
glView->lastMousePoint = mouse;
} // rightMouseDragged
//---------------------------------------------------------------------------
@end
//---------------------------------------------------------------------------
//---------------------------------------------------------------------------
</pre>
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