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comparison Classes/EAGLView.m @ 0:5ec52341f221

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Initial commit
author Eric Wing <ewing@anscamobile.com>
date Fri, 29 Jul 2011 18:18:15 -0700
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-1:000000000000 0:5ec52341f221
1 //
2 // EAGLView.m
3 // MySampleProject
4 //
5 // Created by Eric Wing on 7/29/11.
6 // Copyright 2011 __MyCompanyName__. All rights reserved.
7 //
8
9 #import <QuartzCore/QuartzCore.h>
10
11 #import "EAGLView.h"
12
13 @interface EAGLView (PrivateMethods)
14 - (void)createFramebuffer;
15 - (void)deleteFramebuffer;
16 @end
17
18 @implementation EAGLView
19
20 @dynamic context;
21
22 // You must implement this method
23 + (Class)layerClass
24 {
25 return [CAEAGLLayer class];
26 }
27
28 //The EAGL view is stored in the nib file. When it's unarchived it's sent -initWithCoder:.
29 - (id)initWithCoder:(NSCoder*)coder
30 {
31 self = [super initWithCoder:coder];
32 if (self)
33 {
34 CAEAGLLayer *eaglLayer = (CAEAGLLayer *)self.layer;
35
36 eaglLayer.opaque = TRUE;
37 eaglLayer.drawableProperties = [NSDictionary dictionaryWithObjectsAndKeys:
38 [NSNumber numberWithBool:FALSE], kEAGLDrawablePropertyRetainedBacking,
39 kEAGLColorFormatRGBA8, kEAGLDrawablePropertyColorFormat,
40 nil];
41 }
42
43 return self;
44 }
45
46 - (void)dealloc
47 {
48 [self deleteFramebuffer];
49 [context release];
50
51 [super dealloc];
52 }
53
54 - (EAGLContext *)context
55 {
56 return context;
57 }
58
59 - (void)setContext:(EAGLContext *)newContext
60 {
61 if (context != newContext)
62 {
63 [self deleteFramebuffer];
64
65 [context release];
66 context = [newContext retain];
67
68 [EAGLContext setCurrentContext:nil];
69 }
70 }
71
72 - (void)createFramebuffer
73 {
74 if (context && !defaultFramebuffer)
75 {
76 [EAGLContext setCurrentContext:context];
77
78 // Create default framebuffer object.
79 glGenFramebuffers(1, &defaultFramebuffer);
80 glBindFramebuffer(GL_FRAMEBUFFER, defaultFramebuffer);
81
82 // Create color render buffer and allocate backing store.
83 glGenRenderbuffers(1, &colorRenderbuffer);
84 glBindRenderbuffer(GL_RENDERBUFFER, colorRenderbuffer);
85 [context renderbufferStorage:GL_RENDERBUFFER fromDrawable:(CAEAGLLayer *)self.layer];
86 glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_WIDTH, &framebufferWidth);
87 glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_HEIGHT, &framebufferHeight);
88
89 glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, colorRenderbuffer);
90
91 if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE)
92 NSLog(@"Failed to make complete framebuffer object %x", glCheckFramebufferStatus(GL_FRAMEBUFFER));
93 }
94 }
95
96 - (void)deleteFramebuffer
97 {
98 if (context)
99 {
100 [EAGLContext setCurrentContext:context];
101
102 if (defaultFramebuffer)
103 {
104 glDeleteFramebuffers(1, &defaultFramebuffer);
105 defaultFramebuffer = 0;
106 }
107
108 if (colorRenderbuffer)
109 {
110 glDeleteRenderbuffers(1, &colorRenderbuffer);
111 colorRenderbuffer = 0;
112 }
113 }
114 }
115
116 - (void)setFramebuffer
117 {
118 if (context)
119 {
120 [EAGLContext setCurrentContext:context];
121
122 if (!defaultFramebuffer)
123 [self createFramebuffer];
124
125 glBindFramebuffer(GL_FRAMEBUFFER, defaultFramebuffer);
126
127 glViewport(0, 0, framebufferWidth, framebufferHeight);
128 }
129 }
130
131 - (BOOL)presentFramebuffer
132 {
133 BOOL success = FALSE;
134
135 if (context)
136 {
137 [EAGLContext setCurrentContext:context];
138
139 glBindRenderbuffer(GL_RENDERBUFFER, colorRenderbuffer);
140
141 success = [context presentRenderbuffer:GL_RENDERBUFFER];
142 }
143
144 return success;
145 }
146
147 - (void)layoutSubviews
148 {
149 // The framebuffer will be re-created at the beginning of the next setFramebuffer method call.
150 [self deleteFramebuffer];
151 }
152
153 @end