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comparison src/video/uikit/SDL_uikitopenglview.m @ 2351:d2a519d2cc57 gsoc2008_iphone

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SDL_uikitopenglview is an OpenGL ES View class based on the one found in Apple's OpenGL ES based application template. It's created from SDL_uikitopengles.m, normally.
author Holmes Futrell <hfutrell@umail.ucsb.edu>
date Thu, 17 Jul 2008 22:35:59 +0000
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children e103b316a4ef
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2350:eb828d6c3efb 2351:d2a519d2cc57
1 //
2 // EAGLView.m
3 // test2
4 //
5 // Created by Holmes Futrell on 7/11/08.
6 // Copyright __MyCompanyName__ 2008. All rights reserved.
7 //
8
9
10
11 #import <QuartzCore/QuartzCore.h>
12 #import <OpenGLES/EAGLDrawable.h>
13
14 #import "SDL_uikitopenglview.h"
15
16 // A class extension to declare private methods
17 @interface SDL_uikitopenglview (privateMethods)
18
19 - (BOOL) createFramebuffer;
20 - (void) destroyFramebuffer;
21
22 @end
23
24
25 @implementation SDL_uikitopenglview
26
27 @synthesize context;
28 // You must implement this
29 + (Class)layerClass {
30 return [CAEAGLLayer class];
31 }
32
33 /*
34 stencilBits ignored.
35 Right now iPhone stencil buffer doesn't appear supported. Maybe it will be in the future ... who knows.
36 */
37 - (id)initWithFrame:(CGRect)frame \
38 retainBacking:(BOOL)retained \
39 rBits:(int)rBits \
40 gBits:(int)gBits \
41 bBits:(int)bBits \
42 aBits:(int)aBits \
43 depthBits:(int)depthBits \
44 {
45
46 NSString *colorFormat=nil;
47 GLuint depthBufferFormat;
48 BOOL useDepthBuffer;
49
50 if (rBits == 8 && gBits == 8 && bBits == 8) {
51 /* if user specifically requests rbg888 or some color format higher than 16bpp */
52 colorFormat = kEAGLColorFormatRGBA8;
53 }
54 else {
55 /* default case (faster) */
56 colorFormat = kEAGLColorFormatRGB565;
57 }
58
59 if (depthBits == 24) {
60 useDepthBuffer = YES;
61 depthBufferFormat = GL_DEPTH_COMPONENT24_OES;
62 }
63 else if (depthBits == 0) {
64 useDepthBuffer = NO;
65 }
66 else {
67 /* default case when depth buffer is not disabled */
68 /*
69 strange, even when we use this, we seem to get a 24 bit depth buffer on iPhone.
70 perhaps that's the only depth format iPhone actually supports
71 */
72 useDepthBuffer = YES;
73 depthBufferFormat = GL_DEPTH_COMPONENT16_OES;
74 }
75
76 if ((self = [super initWithFrame:frame])) {
77 // Get the layer
78 CAEAGLLayer *eaglLayer = (CAEAGLLayer *)self.layer;
79
80 eaglLayer.opaque = YES;
81 eaglLayer.drawableProperties = [NSDictionary dictionaryWithObjectsAndKeys:
82 [NSNumber numberWithBool: retained], kEAGLDrawablePropertyRetainedBacking, colorFormat, kEAGLDrawablePropertyColorFormat, nil];
83
84 context = [[EAGLContext alloc] initWithAPI: kEAGLRenderingAPIOpenGLES1];
85
86 if (!context || ![EAGLContext setCurrentContext:context]) {
87 [self release];
88 return nil;
89 }
90
91 /* create the buffers */
92 glGenFramebuffersOES(1, &viewFramebuffer);
93 glGenRenderbuffersOES(1, &viewRenderbuffer);
94
95 glBindFramebufferOES(GL_FRAMEBUFFER_OES, viewFramebuffer);
96 glBindRenderbufferOES(GL_RENDERBUFFER_OES, viewRenderbuffer);
97 [context renderbufferStorage:GL_RENDERBUFFER_OES fromDrawable:(CAEAGLLayer*)self.layer];
98 glFramebufferRenderbufferOES(GL_FRAMEBUFFER_OES, GL_COLOR_ATTACHMENT0_OES, GL_RENDERBUFFER_OES, viewRenderbuffer);
99
100 glGetRenderbufferParameterivOES(GL_RENDERBUFFER_OES, GL_RENDERBUFFER_WIDTH_OES, &backingWidth);
101 glGetRenderbufferParameterivOES(GL_RENDERBUFFER_OES, GL_RENDERBUFFER_HEIGHT_OES, &backingHeight);
102
103 if (useDepthBuffer) {
104 glGenRenderbuffersOES(1, &depthRenderbuffer);
105 glBindRenderbufferOES(GL_RENDERBUFFER_OES, depthRenderbuffer);
106 glRenderbufferStorageOES(GL_RENDERBUFFER_OES, depthBufferFormat, backingWidth, backingHeight);
107 glFramebufferRenderbufferOES(GL_FRAMEBUFFER_OES, GL_DEPTH_ATTACHMENT_OES, GL_RENDERBUFFER_OES, depthRenderbuffer);
108 }
109
110 if(glCheckFramebufferStatusOES(GL_FRAMEBUFFER_OES) != GL_FRAMEBUFFER_COMPLETE_OES) {
111 NSLog(@"failed to make complete framebuffer object %x", glCheckFramebufferStatusOES(GL_FRAMEBUFFER_OES));
112 return NO;
113 }
114 /* end create buffers */
115
116 NSLog(@"Done initializing ...");
117
118 }
119 return self;
120 }
121
122 - (void)setCurrentContext {
123 [EAGLContext setCurrentContext:context];
124 }
125
126
127 - (void)swapBuffers {
128
129
130 glBindRenderbufferOES(GL_RENDERBUFFER_OES, viewRenderbuffer);
131 if (![context presentRenderbuffer:GL_RENDERBUFFER_OES]) {
132 NSLog(@"Could not swap buffers");
133 }
134 }
135
136
137 - (void)layoutSubviews {
138 [EAGLContext setCurrentContext:context];
139 }
140
141 - (void)destroyFramebuffer {
142
143 glDeleteFramebuffersOES(1, &viewFramebuffer);
144 viewFramebuffer = 0;
145 glDeleteRenderbuffersOES(1, &viewRenderbuffer);
146 viewRenderbuffer = 0;
147
148 if (depthRenderbuffer) {
149 glDeleteRenderbuffersOES(1, &depthRenderbuffer);
150 depthRenderbuffer = 0;
151 }
152 }
153
154
155 - (void)dealloc {
156
157 [self destroyFramebuffer];
158 if ([EAGLContext currentContext] == context) {
159 [EAGLContext setCurrentContext:nil];
160 }
161 [context release];
162 [super dealloc];
163
164 }
165
166 @end