This repository has been archived by the owner on Feb 11, 2021. It is now read-only.
SDL_uikitopenglview.m
1
2
/*
SDL - Simple DirectMedia Layer
3
Copyright (C) 1997-2009 Sam Lantinga
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Sam Lantinga
slouken@libsdl.org
*/
#import <QuartzCore/QuartzCore.h>
#import <OpenGLES/EAGLDrawable.h>
#import "SDL_uikitopenglview.h"
@interface SDL_uikitopenglview (privateMethods)
- (BOOL) createFramebuffer;
- (void) destroyFramebuffer;
@end
@implementation SDL_uikitopenglview
@synthesize context;
+ (Class)layerClass {
40
return [CAEAGLLayer class];
41
42
43
}
- (id)initWithFrame:(CGRect)frame \
44
45
46
47
48
49
retainBacking:(BOOL)retained \
rBits:(int)rBits \
gBits:(int)gBits \
bBits:(int)bBits \
aBits:(int)aBits \
depthBits:(int)depthBits \
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
NSString *colorFormat=nil;
GLuint depthBufferFormat;
BOOL useDepthBuffer;
if (rBits == 8 && gBits == 8 && bBits == 8) {
/* if user specifically requests rbg888 or some color format higher than 16bpp */
colorFormat = kEAGLColorFormatRGBA8;
}
else {
/* default case (faster) */
colorFormat = kEAGLColorFormatRGB565;
}
if (depthBits == 24) {
useDepthBuffer = YES;
depthBufferFormat = GL_DEPTH_COMPONENT24_OES;
}
else if (depthBits == 0) {
useDepthBuffer = NO;
}
else {
/* default case when depth buffer is not disabled */
/*
strange, even when we use this, we seem to get a 24 bit depth buffer on iPhone.
perhaps that's the only depth format iPhone actually supports
*/
useDepthBuffer = YES;
depthBufferFormat = GL_DEPTH_COMPONENT16_OES;
}
if ((self = [super initWithFrame:frame])) {
// Get the layer
CAEAGLLayer *eaglLayer = (CAEAGLLayer *)self.layer;
eaglLayer.opaque = YES;
eaglLayer.drawableProperties = [NSDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithBool: retained], kEAGLDrawablePropertyRetainedBacking, colorFormat, kEAGLDrawablePropertyColorFormat, nil];
context = [[EAGLContext alloc] initWithAPI: kEAGLRenderingAPIOpenGLES1];
if (!context || ![EAGLContext setCurrentContext:context]) {
[self release];
return nil;
}
/* create the buffers */
glGenFramebuffersOES(1, &viewFramebuffer);
glGenRenderbuffersOES(1, &viewRenderbuffer);
glBindFramebufferOES(GL_FRAMEBUFFER_OES, viewFramebuffer);
glBindRenderbufferOES(GL_RENDERBUFFER_OES, viewRenderbuffer);
[context renderbufferStorage:GL_RENDERBUFFER_OES fromDrawable:(CAEAGLLayer*)self.layer];
glFramebufferRenderbufferOES(GL_FRAMEBUFFER_OES, GL_COLOR_ATTACHMENT0_OES, GL_RENDERBUFFER_OES, viewRenderbuffer);
glGetRenderbufferParameterivOES(GL_RENDERBUFFER_OES, GL_RENDERBUFFER_WIDTH_OES, &backingWidth);
glGetRenderbufferParameterivOES(GL_RENDERBUFFER_OES, GL_RENDERBUFFER_HEIGHT_OES, &backingHeight);
if (useDepthBuffer) {
glGenRenderbuffersOES(1, &depthRenderbuffer);
glBindRenderbufferOES(GL_RENDERBUFFER_OES, depthRenderbuffer);
glRenderbufferStorageOES(GL_RENDERBUFFER_OES, depthBufferFormat, backingWidth, backingHeight);
glFramebufferRenderbufferOES(GL_FRAMEBUFFER_OES, GL_DEPTH_ATTACHMENT_OES, GL_RENDERBUFFER_OES, depthRenderbuffer);
}
if(glCheckFramebufferStatusOES(GL_FRAMEBUFFER_OES) != GL_FRAMEBUFFER_COMPLETE_OES) {
return NO;
}
/* end create buffers */
}
return self;
121
122
123
}
- (void)setCurrentContext {
124
[EAGLContext setCurrentContext:context];
125
126
127
128
}
- (void)swapBuffers {
129
130
glBindRenderbufferOES(GL_RENDERBUFFER_OES, viewRenderbuffer);
[context presentRenderbuffer:GL_RENDERBUFFER_OES];
131
132
133
134
}
- (void)layoutSubviews {
135
[EAGLContext setCurrentContext:context];
136
137
138
}
- (void)destroyFramebuffer {
139
140
141
142
143
144
145
146
147
glDeleteFramebuffersOES(1, &viewFramebuffer);
viewFramebuffer = 0;
glDeleteRenderbuffersOES(1, &viewRenderbuffer);
viewRenderbuffer = 0;
if (depthRenderbuffer) {
glDeleteRenderbuffersOES(1, &depthRenderbuffer);
depthRenderbuffer = 0;
}
148
149
150
151
}
- (void)dealloc {
152
153
154
155
156
157
[self destroyFramebuffer];
if ([EAGLContext currentContext] == context) {
[EAGLContext setCurrentContext:nil];
}
[context release];
[super dealloc];
160
@end