This repository has been archived by the owner on Feb 11, 2021. It is now read-only.
/
SDL_uikitopenglview.m
207 lines (169 loc) · 7.33 KB
1
2
3
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
/*
Simple DirectMedia Layer
Copyright (C) 1997-2011 Sam Lantinga <slouken@libsdl.org>
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/
#import <QuartzCore/QuartzCore.h>
#import <OpenGLES/EAGLDrawable.h>
#import "SDL_uikitopenglview.h"
@implementation SDL_uikitopenglview
@synthesize context;
31
32
+ (Class)layerClass
{
33
34
35
return [CAEAGLLayer class];
}
36
37
38
39
40
41
42
- (id)initWithFrame:(CGRect)frame
retainBacking:(BOOL)retained
rBits:(int)rBits
gBits:(int)gBits
bBits:(int)bBits
aBits:(int)aBits
depthBits:(int)depthBits
43
stencilBits:(int)stencilBits
44
majorVersion:(int)majorVersion
45
{
46
47
const BOOL useStencilBuffer = (stencilBits != 0);
const BOOL useDepthBuffer = (depthBits != 0);
48
NSString *colorFormat = nil;
49
50
51
52
53
54
55
56
57
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;
}
58
59
60
depthBufferFormat = 0;
61
62
63
64
65
66
67
68
69
70
71
72
if (useDepthBuffer) {
if (depthBits == 24) {
depthBufferFormat = GL_DEPTH_COMPONENT24_OES;
}
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
*/
depthBufferFormat = GL_DEPTH_COMPONENT16_OES;
}
73
}
74
75
76
77
if ((self = [super initWithFrame:frame])) {
// Get the layer
CAEAGLLayer *eaglLayer = (CAEAGLLayer *)self.layer;
78
79
80
81
eaglLayer.opaque = YES;
eaglLayer.drawableProperties = [NSDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithBool: retained], kEAGLDrawablePropertyRetainedBacking, colorFormat, kEAGLDrawablePropertyColorFormat, nil];
82
83
84
85
86
87
88
89
90
91
if (majorVersion > 1) {
context = [[EAGLContext alloc] initWithAPI: kEAGLRenderingAPIOpenGLES2];
} else {
context = [[EAGLContext alloc] initWithAPI: kEAGLRenderingAPIOpenGLES1];
}
if (!context || ![EAGLContext setCurrentContext:context]) {
[self release];
return nil;
}
92
93
94
95
/* create the buffers */
glGenFramebuffersOES(1, &viewFramebuffer);
glGenRenderbuffersOES(1, &viewRenderbuffer);
96
97
98
99
100
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);
101
102
103
104
glGetRenderbufferParameterivOES(GL_RENDERBUFFER_OES, GL_RENDERBUFFER_WIDTH_OES, &backingWidth);
glGetRenderbufferParameterivOES(GL_RENDERBUFFER_OES, GL_RENDERBUFFER_HEIGHT_OES, &backingHeight);
105
106
107
108
109
110
if ((useDepthBuffer) || (useStencilBuffer)) {
if (useStencilBuffer) {
// Apparently you need to pack stencil and depth into one buffer.
// !!! FIXME: this is the only thing (currently) supported. May not always be true.
depthBufferFormat = GL_DEPTH24_STENCIL8_OES;
}
111
112
113
glGenRenderbuffersOES(1, &depthRenderbuffer);
glBindRenderbufferOES(GL_RENDERBUFFER_OES, depthRenderbuffer);
glRenderbufferStorageOES(GL_RENDERBUFFER_OES, depthBufferFormat, backingWidth, backingHeight);
114
115
116
117
118
119
if (useDepthBuffer) {
glFramebufferRenderbufferOES(GL_FRAMEBUFFER_OES, GL_DEPTH_ATTACHMENT_OES, GL_RENDERBUFFER_OES, depthRenderbuffer);
}
if (useStencilBuffer) {
glFramebufferRenderbufferOES(GL_FRAMEBUFFER_OES, GL_STENCIL_ATTACHMENT_OES, GL_RENDERBUFFER_OES, depthRenderbuffer);
}
120
}
121
122
if (glCheckFramebufferStatusOES(GL_FRAMEBUFFER_OES) != GL_FRAMEBUFFER_COMPLETE_OES) {
123
124
125
126
127
128
129
130
131
132
133
134
135
136
return NO;
}
/* end create buffers */
// !!! FIXME: use the screen this is on!
/* Use the main screen scale (for retina display support) */
if ([[UIScreen mainScreen] respondsToSelector:@selector(scale)])
self.contentScaleFactor = [UIScreen mainScreen].scale;
self.autoresizingMask = 0; // don't allow autoresize, since we need to do some magic in -(void)updateFrame.
}
return self;
}
137
138
- (void)updateFrame
{
139
140
141
142
143
144
145
146
glBindFramebufferOES(GL_FRAMEBUFFER_OES, viewFramebuffer);
glBindRenderbufferOES(GL_RENDERBUFFER_OES, 0);
glFramebufferRenderbufferOES(GL_FRAMEBUFFER_OES, GL_COLOR_ATTACHMENT0_OES, GL_RENDERBUFFER_OES, 0);
glDeleteRenderbuffersOES(1, &viewRenderbuffer);
glGenRenderbuffersOES(1, &viewRenderbuffer);
glBindRenderbufferOES(GL_RENDERBUFFER_OES, viewRenderbuffer);
[context renderbufferStorage:GL_RENDERBUFFER_OES fromDrawable:(CAEAGLLayer*)self.layer];
147
glFramebufferRenderbufferOES(GL_FRAMEBUFFER_OES, GL_COLOR_ATTACHMENT0_OES, GL_RENDERBUFFER_OES, viewRenderbuffer);
148
149
150
151
152
153
154
155
glGetRenderbufferParameterivOES(GL_RENDERBUFFER_OES, GL_RENDERBUFFER_WIDTH_OES, &backingWidth);
glGetRenderbufferParameterivOES(GL_RENDERBUFFER_OES, GL_RENDERBUFFER_HEIGHT_OES, &backingHeight);
if (depthRenderbuffer != 0) {
glBindRenderbufferOES(GL_RENDERBUFFER_OES, depthRenderbuffer);
glRenderbufferStorageOES(GL_RENDERBUFFER_OES, depthBufferFormat, backingWidth, backingHeight);
}
156
157
158
159
160
161
162
// !!! FIXME: use the screen this is on!
/* Use the main screen scale (for retina display support) */
if ([[UIScreen mainScreen] respondsToSelector:@selector(scale)])
self.contentScaleFactor = [UIScreen mainScreen].scale;
}
163
164
- (void)setCurrentContext
{
165
166
167
168
[EAGLContext setCurrentContext:context];
}
169
170
- (void)swapBuffers
{
171
172
173
174
175
glBindRenderbufferOES(GL_RENDERBUFFER_OES, viewRenderbuffer);
[context presentRenderbuffer:GL_RENDERBUFFER_OES];
}
176
177
- (void)layoutSubviews
{
178
179
180
[EAGLContext setCurrentContext:context];
}
181
182
- (void)destroyFramebuffer
{
183
184
185
186
glDeleteFramebuffersOES(1, &viewFramebuffer);
viewFramebuffer = 0;
glDeleteRenderbuffersOES(1, &viewRenderbuffer);
viewRenderbuffer = 0;
187
188
189
190
191
192
193
194
if (depthRenderbuffer) {
glDeleteRenderbuffersOES(1, &depthRenderbuffer);
depthRenderbuffer = 0;
}
}
195
196
- (void)dealloc
{
197
198
199
200
[self destroyFramebuffer];
if ([EAGLContext currentContext] == context) {
[EAGLContext setCurrentContext:nil];
}
201
[context release];
202
203
204
205
206
207
[super dealloc];
}
@end
/* vi: set ts=4 sw=4 expandtab: */