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Darcy Liu
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add GLGravity
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‎GLGravity.zip‎

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‎GLGravity/Classes/GLGravityAppDelegate.h‎

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/*
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File: GLGravityAppDelegate.h
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Abstract: The GLGravityAppDelegate class is the app delegate that ties
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everything together. It updates the acceletometer values used to draw
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OpenGL content in the GLGravityView class.
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Version: 2.2
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Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple
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Inc. ("Apple") in consideration of your agreement to the following
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terms, and your use, installation, modification or redistribution of
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this Apple software constitutes acceptance of these terms. If you do
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not agree with these terms, please do not use, install, modify or
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redistribute this Apple software.
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In consideration of your agreement to abide by the following terms, and
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subject to these terms, Apple grants you a personal, non-exclusive
17+
license, under Apple's copyrights in this original Apple software (the
18+
"Apple Software"), to use, reproduce, modify and redistribute the Apple
19+
Software, with or without modifications, in source and/or binary forms;
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provided that if you redistribute the Apple Software in its entirety and
21+
without modifications, you must retain this notice and the following
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text and disclaimers in all such redistributions of the Apple Software.
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Neither the name, trademarks, service marks or logos of Apple Inc. may
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be used to endorse or promote products derived from the Apple Software
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without specific prior written permission from Apple. Except as
26+
expressly stated in this notice, no other rights or licenses, express or
27+
implied, are granted by Apple herein, including but not limited to any
28+
patent rights that may be infringed by your derivative works or by other
29+
works in which the Apple Software may be incorporated.
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The Apple Software is provided by Apple on an "AS IS" basis. APPLE
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MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION
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THE IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS
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FOR A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND
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OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS.
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IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL
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OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
39+
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION,
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MODIFICATION AND/OR DISTRIBUTION OF THE APPLE SOFTWARE, HOWEVER CAUSED
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AND WHETHER UNDER THEORY OF CONTRACT, TORT (INCLUDING NEGLIGENCE),
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STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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Copyright (C) 2010 Apple Inc. All Rights Reserved.
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*/
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#import <UIKit/UIKit.h>
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@class GLGravityView;
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@interface GLGravityAppDelegate : NSObject <UIApplicationDelegate, UIAccelerometerDelegate> {
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UIWindow *window;
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GLGravityView *glView;
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UIAccelerationValue accel[3];
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}
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@property (nonatomic, retain) IBOutlet UIWindow *window;
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@property (nonatomic, retain) IBOutlet GLGravityView *glView;
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@end
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‎GLGravity/Classes/GLGravityAppDelegate.m‎

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/*
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File: GLGravityAppDelegate.m
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Abstract: The GLGravityAppDelegate class is the app delegate that ties
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everything together. It updates the acceletometer values used to draw
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OpenGL content in the GLGravityView class.
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Version: 2.2
7+
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Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple
9+
Inc. ("Apple") in consideration of your agreement to the following
10+
terms, and your use, installation, modification or redistribution of
11+
this Apple software constitutes acceptance of these terms. If you do
12+
not agree with these terms, please do not use, install, modify or
13+
redistribute this Apple software.
14+
15+
In consideration of your agreement to abide by the following terms, and
16+
subject to these terms, Apple grants you a personal, non-exclusive
17+
license, under Apple's copyrights in this original Apple software (the
18+
"Apple Software"), to use, reproduce, modify and redistribute the Apple
19+
Software, with or without modifications, in source and/or binary forms;
20+
provided that if you redistribute the Apple Software in its entirety and
21+
without modifications, you must retain this notice and the following
22+
text and disclaimers in all such redistributions of the Apple Software.
23+
Neither the name, trademarks, service marks or logos of Apple Inc. may
24+
be used to endorse or promote products derived from the Apple Software
25+
without specific prior written permission from Apple. Except as
26+
expressly stated in this notice, no other rights or licenses, express or
27+
implied, are granted by Apple herein, including but not limited to any
28+
patent rights that may be infringed by your derivative works or by other
29+
works in which the Apple Software may be incorporated.
30+
31+
The Apple Software is provided by Apple on an "AS IS" basis. APPLE
32+
MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION
33+
THE IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS
34+
FOR A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND
35+
OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS.
36+
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IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL
38+
OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
39+
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
40+
INTERRUPTION) ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION,
41+
MODIFICATION AND/OR DISTRIBUTION OF THE APPLE SOFTWARE, HOWEVER CAUSED
42+
AND WHETHER UNDER THEORY OF CONTRACT, TORT (INCLUDING NEGLIGENCE),
43+
STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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Copyright (C) 2010 Apple Inc. All Rights Reserved.
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*/
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#import "GLGravityAppDelegate.h"
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#import "GLGravityView.h"
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// CONSTANTS
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#define kAccelerometerFrequency 100.0 // Hz
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#define kFilteringFactor 0.1
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@implementation GLGravityAppDelegate
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@synthesize window;
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@synthesize glView;
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- (void) applicationDidFinishLaunching:(UIApplication *)application
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{
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[glView startAnimation];
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//Configure and start accelerometer
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[[UIAccelerometer sharedAccelerometer] setUpdateInterval:(1.0 / kAccelerometerFrequency)];
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[[UIAccelerometer sharedAccelerometer] setDelegate:self];
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}
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- (void) applicationWillResignActive:(UIApplication *)application
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{
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[glView stopAnimation];
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}
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- (void) applicationDidBecomeActive:(UIApplication *)application
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{
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[glView startAnimation];
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}
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- (void)applicationWillTerminate:(UIApplication *)application
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{
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[glView stopAnimation];
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}
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- (void) dealloc
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{
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[window release];
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[glView release];
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[super dealloc];
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}
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- (void)accelerometer:(UIAccelerometer*)accelerometer didAccelerate:(UIAcceleration*)acceleration
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{
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//Use a basic low-pass filter to only keep the gravity in the accelerometer values
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accel[0] = acceleration.x * kFilteringFactor + accel[0] * (1.0 - kFilteringFactor);
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accel[1] = acceleration.y * kFilteringFactor + accel[1] * (1.0 - kFilteringFactor);
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accel[2] = acceleration.z * kFilteringFactor + accel[2] * (1.0 - kFilteringFactor);
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//Update the accelerometer values for the view
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[glView setAccel:accel];
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}
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@end

‎GLGravity/Classes/GLGravityView.h‎

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/*
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File: GLGravityView.h
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Abstract: This class wraps the CAEAGLLayer from CoreAnimation into a convenient
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UIView subclass. The view content is basically an EAGL surface you render your
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OpenGL scene into. Note that setting the view non-opaque will only work if the
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EAGL surface has an alpha channel.
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Version: 2.2
8+
9+
Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple
10+
Inc. ("Apple") in consideration of your agreement to the following
11+
terms, and your use, installation, modification or redistribution of
12+
this Apple software constitutes acceptance of these terms. If you do
13+
not agree with these terms, please do not use, install, modify or
14+
redistribute this Apple software.
15+
16+
In consideration of your agreement to abide by the following terms, and
17+
subject to these terms, Apple grants you a personal, non-exclusive
18+
license, under Apple's copyrights in this original Apple software (the
19+
"Apple Software"), to use, reproduce, modify and redistribute the Apple
20+
Software, with or without modifications, in source and/or binary forms;
21+
provided that if you redistribute the Apple Software in its entirety and
22+
without modifications, you must retain this notice and the following
23+
text and disclaimers in all such redistributions of the Apple Software.
24+
Neither the name, trademarks, service marks or logos of Apple Inc. may
25+
be used to endorse or promote products derived from the Apple Software
26+
without specific prior written permission from Apple. Except as
27+
expressly stated in this notice, no other rights or licenses, express or
28+
implied, are granted by Apple herein, including but not limited to any
29+
patent rights that may be infringed by your derivative works or by other
30+
works in which the Apple Software may be incorporated.
31+
32+
The Apple Software is provided by Apple on an "AS IS" basis. APPLE
33+
MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION
34+
THE IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS
35+
FOR A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND
36+
OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS.
37+
38+
IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL
39+
OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
40+
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
41+
INTERRUPTION) ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION,
42+
MODIFICATION AND/OR DISTRIBUTION OF THE APPLE SOFTWARE, HOWEVER CAUSED
43+
AND WHETHER UNDER THEORY OF CONTRACT, TORT (INCLUDING NEGLIGENCE),
44+
STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN ADVISED OF THE
45+
POSSIBILITY OF SUCH DAMAGE.
46+
47+
Copyright (C) 2010 Apple Inc. All Rights Reserved.
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*/
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#import <UIKit/UIKit.h>
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#import <OpenGLES/EAGL.h>
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#import <OpenGLES/ES1/gl.h>
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#import <OpenGLES/ES1/glext.h>
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@interface GLGravityView : UIView
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{
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@private
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// The pixel dimensions of the backbuffer
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GLint backingWidth;
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GLint backingHeight;
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EAGLContext *context;
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// OpenGL names for the renderbuffer and framebuffers used to render to this view
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GLuint viewRenderbuffer, viewFramebuffer;
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// OpenGL name for the depth buffer that is attached to viewFramebuffer, if it exists (0 if it does not exist)
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GLuint depthRenderbuffer;
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BOOL animating;
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BOOL displayLinkSupported;
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NSInteger animationFrameInterval;
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// Use of the CADisplayLink class is the preferred method for controlling your animation timing.
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// CADisplayLink will link to the main display and fire every vsync when added to a given run-loop.
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// The NSTimer class is used only as fallback when running on a pre 3.1 device where CADisplayLink
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// isn't available.
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id displayLink;
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NSTimer *animationTimer;
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UIAccelerationValue *accel;
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}
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@property (readonly, nonatomic, getter=isAnimating) BOOL animating;
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@property (nonatomic) NSInteger animationFrameInterval;
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@property (nonatomic) UIAccelerationValue *accel;
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-(void)startAnimation;
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-(void)stopAnimation;
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-(void)drawView;
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@end

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