MyEAGLView.m
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上传日期:2015-08-08
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- /*
- ===== IMPORTANT =====
- This is sample code demonstrating API, technology or techniques in development.
- Although this sample code has been reviewed for technical accuracy, it is not
- final. Apple is supplying this information to help you plan for the adoption of
- the technologies and programming interfaces described herein. This information
- is subject to change, and software implemented based on this sample code should
- be tested with final operating system software and final documentation. Newer
- versions of this sample code may be provided with future seeds of the API or
- technology. For information about updates to this and other developer
- documentation, view the New & Updated sidebars in subsequent documentation
- seeds.
- =====================
- File: MyEAGLView.m
- Abstract: Convenience class that wraps the CAEAGLLayer from CoreAnimation into a
- UIView subclass.
- Version: 1.6
- Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple 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 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 <QuartzCore/QuartzCore.h>
- #import "MyEAGLView.h"
- #import "CrashLandingAppDelegate.h"
- //CLASS IMPLEMENTATIONS:
- @implementation MyEAGLView
- @synthesize delegate=_delegate, autoresizesSurface=_autoresize, surfaceSize=_size, framebuffer = _framebuffer, pixelFormat = _format, depthFormat = _depthFormat, context = _context;
- + (Class) layerClass
- {
- return [CAEAGLLayer class];
- }
- - (BOOL) _createSurface
- {
- CAEAGLLayer* eaglLayer = (CAEAGLLayer*)[self layer];
- CGSize newSize;
- GLuint oldRenderbuffer;
- GLuint oldFramebuffer;
-
- if(![EAGLContext setCurrentContext:_context]) {
- return NO;
- }
-
- newSize = [eaglLayer bounds].size;
- newSize.width = roundf(newSize.width);
- newSize.height = roundf(newSize.height);
-
- glGetIntegerv(GL_RENDERBUFFER_BINDING_OES, (GLint *) &oldRenderbuffer);
- glGetIntegerv(GL_FRAMEBUFFER_BINDING_OES, (GLint *) &oldFramebuffer);
-
- glGenRenderbuffersOES(1, &_renderbuffer);
- glBindRenderbufferOES(GL_RENDERBUFFER_OES, _renderbuffer);
-
- if(![_context renderbufferStorage:GL_RENDERBUFFER_OES fromDrawable:eaglLayer]) {
- glDeleteRenderbuffersOES(1, &_renderbuffer);
- glBindRenderbufferOES(GL_RENDERBUFFER_BINDING_OES, oldRenderbuffer);
- return NO;
- }
-
- glGenFramebuffersOES(1, &_framebuffer);
- glBindFramebufferOES(GL_FRAMEBUFFER_OES, _framebuffer);
- glFramebufferRenderbufferOES(GL_FRAMEBUFFER_OES, GL_COLOR_ATTACHMENT0_OES, GL_RENDERBUFFER_OES, _renderbuffer);
- if (_depthFormat) {
- glGenRenderbuffersOES(1, &_depthBuffer);
- glBindRenderbufferOES(GL_RENDERBUFFER_OES, _depthBuffer);
- glRenderbufferStorageOES(GL_RENDERBUFFER_OES, _depthFormat, newSize.width, newSize.height);
- glFramebufferRenderbufferOES(GL_FRAMEBUFFER_OES, GL_DEPTH_ATTACHMENT_OES, GL_RENDERBUFFER_OES, _depthBuffer);
- }
-
- _size = newSize;
- if(!_hasBeenCurrent) {
- glViewport(0, 0, newSize.width, newSize.height);
- glScissor(0, 0, newSize.width, newSize.height);
- _hasBeenCurrent = YES;
- }
- else {
- glBindFramebufferOES(GL_FRAMEBUFFER_OES, oldFramebuffer);
- }
- glBindRenderbufferOES(GL_RENDERBUFFER_OES, oldRenderbuffer);
-
-
-
- [_delegate didResizeEAGLSurfaceForView:self];
-
- return YES;
- }
- - (void) _destroySurface
- {
- EAGLContext *oldContext = [EAGLContext currentContext];
-
- if (oldContext != _context)
- [EAGLContext setCurrentContext:_context];
-
- if(_depthFormat) {
- glDeleteRenderbuffersOES(1, &_depthBuffer);
- _depthBuffer = 0;
- }
-
- glDeleteRenderbuffersOES(1, &_renderbuffer);
- _renderbuffer = 0;
-
- glDeleteFramebuffersOES(1, &_framebuffer);
- _framebuffer = 0;
-
- if (oldContext != _context)
- [EAGLContext setCurrentContext:oldContext];
- }
- //The GL view is stored in the nib file. When it's unarchived it's sent -initWithCoder:
- - (id)initWithCoder:(NSCoder*)coder {
-
- if ((self = [super initWithCoder:coder])) {
- CAEAGLLayer *eaglLayer = (CAEAGLLayer*)[self layer];
-
- [eaglLayer setDrawableProperties:[NSDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithBool:NO], kEAGLDrawablePropertyRetainedBacking, kEAGLColorFormatRGB565, kEAGLDrawablePropertyColorFormat, nil]];
- _format = kEAGLColorFormatRGB565;
- _depthFormat = 0;
-
- _context = [[EAGLContext alloc] initWithAPI:kEAGLRenderingAPIOpenGLES1];
- if(_context == nil) {
- [self release];
- return nil;
- }
-
- if(![self _createSurface]) {
- [self release];
- return nil;
- }
- }
-
- return self;
- }
- - (void) dealloc
- {
- [self _destroySurface];
-
- [_context release];
- _context = nil;
-
- [super dealloc];
- }
- - (void) layoutSubviews
- {
- CGRect bounds = [self bounds];
-
- if(_autoresize && ((roundf(bounds.size.width) != _size.width) || (roundf(bounds.size.height) != _size.height))) {
- [self _destroySurface];
- #if __DEBUG__
- REPORT_ERROR(@"Resizing surface from %fx%f to %fx%f", _size.width, _size.height, roundf(bounds.size.width), roundf(bounds.size.height));
- #endif
- [self _createSurface];
- }
- }
- - (void) setAutoresizesEAGLSurface:(BOOL)autoresizesEAGLSurface;
- {
- _autoresize = autoresizesEAGLSurface;
- if(_autoresize)
- [self layoutSubviews];
- }
- - (void) setCurrentContext
- {
- if(![EAGLContext setCurrentContext:_context]) {
- printf("Failed to set current context %p in %sn", _context, __FUNCTION__);
- }
- }
- - (BOOL) isCurrentContext
- {
- return ([EAGLContext currentContext] == _context ? YES : NO);
- }
- - (void) clearCurrentContext
- {
- if(![EAGLContext setCurrentContext:nil])
- printf("Failed to clear current context in %sn", __FUNCTION__);
- }
- - (void) swapBuffers
- {
- EAGLContext *oldContext = [EAGLContext currentContext];
- GLuint oldRenderbuffer;
-
- if(oldContext != _context)
- [EAGLContext setCurrentContext:_context];
-
-
-
- glGetIntegerv(GL_RENDERBUFFER_BINDING_OES, (GLint *) &oldRenderbuffer);
- glBindRenderbufferOES(GL_RENDERBUFFER_OES, _renderbuffer);
-
- if(![_context presentRenderbuffer:GL_RENDERBUFFER_OES])
- printf("Failed to swap renderbuffer in %sn", __FUNCTION__);
-
- if(oldContext != _context)
- [EAGLContext setCurrentContext:oldContext];
- }
- - (CGPoint) convertPointFromViewToSurface:(CGPoint)point
- {
- CGRect bounds = [self bounds];
-
- return CGPointMake((point.x - bounds.origin.x) / bounds.size.width * _size.width, (point.y - bounds.origin.y) / bounds.size.height * _size.height);
- }
- - (CGRect) convertRectFromViewToSurface:(CGRect)rect
- {
- CGRect bounds = [self bounds];
-
- return CGRectMake((rect.origin.x - bounds.origin.x) / bounds.size.width * _size.width, (rect.origin.y - bounds.origin.y) / bounds.size.height * _size.height, rect.size.width / bounds.size.width * _size.width, rect.size.height / bounds.size.height * _size.height);
- }
- // A tap starts game play
- - (void)touchesEnded:(NSSet*)touches withEvent:(UIEvent*)event {
- // Forward tap to application controller
- [(CrashLandingAppDelegate*)[[UIApplication sharedApplication] delegate] handleTap];
- }
- @end