SDL_uikitopenglview.m
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
31
32
33
34
/*
Simple DirectMedia Layer
Copyright (C) 1997-2014 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.
*/
#include "../../SDL_internal.h"
#if SDL_VIDEO_DRIVER_UIKIT
#include <QuartzCore/QuartzCore.h>
#include <OpenGLES/EAGLDrawable.h>
#include "SDL_uikitopenglview.h"
#include "SDL_uikitmessagebox.h"
@implementation SDL_uikitopenglview
@synthesize context;
35
36
37
@synthesize backingWidth = backingWidth;
@synthesize backingHeight = backingHeight;
38
39
40
41
42
43
44
45
46
47
48
49
50
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
+ (Class)layerClass
{
return [CAEAGLLayer class];
}
- (id)initWithFrame:(CGRect)frame
scale:(CGFloat)scale
retainBacking:(BOOL)retained
rBits:(int)rBits
gBits:(int)gBits
bBits:(int)bBits
aBits:(int)aBits
depthBits:(int)depthBits
stencilBits:(int)stencilBits
majorVersion:(int)majorVersion
shareGroup:(EAGLSharegroup*)shareGroup
{
depthBufferFormat = 0;
if ((self = [super initWithFrame:frame])) {
const BOOL useStencilBuffer = (stencilBits != 0);
const BOOL useDepthBuffer = (depthBits != 0);
NSString *colorFormat = nil;
/* The EAGLRenderingAPI enum values currently map 1:1 to major GLES
versions, and this allows us to handle future OpenGL ES versions.
*/
EAGLRenderingAPI api = majorVersion;
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;
}
/* Get the layer */
CAEAGLLayer *eaglLayer = (CAEAGLLayer *)self.layer;
eaglLayer.opaque = YES;
eaglLayer.drawableProperties = [NSDictionary dictionaryWithObjectsAndKeys:
80
81
82
[NSNumber numberWithBool: retained], kEAGLDrawablePropertyRetainedBacking,
colorFormat, kEAGLDrawablePropertyColorFormat,
nil];
83
84
85
86
87
88
89
90
91
context = [[EAGLContext alloc] initWithAPI:api sharegroup:shareGroup];
if (!context || ![EAGLContext setCurrentContext:context]) {
[self release];
SDL_SetError("OpenGL ES %d not supported", majorVersion);
return nil;
}
/* Set the appropriate scale (for retina display support) */
92
self.contentScaleFactor = scale;
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
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
/* 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) || (useStencilBuffer)) {
if (useStencilBuffer) {
/* Apparently you need to pack stencil and depth into one buffer. */
depthBufferFormat = GL_DEPTH24_STENCIL8_OES;
} else if (useDepthBuffer) {
/* iOS only has 24-bit depth buffers, even with GL_DEPTH_COMPONENT16_OES */
depthBufferFormat = GL_DEPTH_COMPONENT24_OES;
}
glGenRenderbuffersOES(1, &depthRenderbuffer);
glBindRenderbufferOES(GL_RENDERBUFFER_OES, depthRenderbuffer);
glRenderbufferStorageOES(GL_RENDERBUFFER_OES, depthBufferFormat, backingWidth, backingHeight);
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);
}
}
if (glCheckFramebufferStatusOES(GL_FRAMEBUFFER_OES) != GL_FRAMEBUFFER_COMPLETE_OES) {
return NO;
}
glBindRenderbufferOES(GL_RENDERBUFFER_OES, viewRenderbuffer);
/* end create buffers */
self.autoresizingMask = (UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight);
self.autoresizesSubviews = YES;
}
return self;
}
- (void)updateFrame
{
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];
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 (depthRenderbuffer != 0) {
glBindRenderbufferOES(GL_RENDERBUFFER_OES, depthRenderbuffer);
glRenderbufferStorageOES(GL_RENDERBUFFER_OES, depthBufferFormat, backingWidth, backingHeight);
}
glBindRenderbufferOES(GL_RENDERBUFFER_OES, viewRenderbuffer);
}
- (void)setAnimationCallback:(int)interval
callback:(void (*)(void*))callback
callbackParam:(void*)callbackParam
{
[self stopAnimation];
animationInterval = interval;
animationCallback = callback;
animationCallbackParam = callbackParam;
if (animationCallback)
[self startAnimation];
}
- (void)startAnimation
{
178
displayLink = [CADisplayLink displayLinkWithTarget:self selector:@selector(doLoop:)];
179
180
181
182
183
184
185
186
187
188
[displayLink setFrameInterval:animationInterval];
[displayLink addToRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
}
- (void)stopAnimation
{
[displayLink invalidate];
displayLink = nil;
}
189
- (void)doLoop:(CADisplayLink*)sender
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
{
/* Don't run the game loop while a messagebox is up */
if (!UIKit_ShowingMessageBox()) {
animationCallback(animationCallbackParam);
}
}
- (void)setCurrentContext
{
[EAGLContext setCurrentContext:context];
}
- (void)swapBuffers
{
/* viewRenderbuffer should always be bound here. Code that binds something
else is responsible for rebinding viewRenderbuffer, to reduce
duplicate state changes. */
[context presentRenderbuffer:GL_RENDERBUFFER_OES];
}
- (void)layoutSubviews
{
[EAGLContext setCurrentContext:context];
[self updateFrame];
}
- (void)destroyFramebuffer
{
glDeleteFramebuffersOES(1, &viewFramebuffer);
viewFramebuffer = 0;
glDeleteRenderbuffersOES(1, &viewRenderbuffer);
viewRenderbuffer = 0;
if (depthRenderbuffer) {
glDeleteRenderbuffersOES(1, &depthRenderbuffer);
depthRenderbuffer = 0;
}
}
- (void)dealloc
{
[self destroyFramebuffer];
if ([EAGLContext currentContext] == context) {
[EAGLContext setCurrentContext:nil];
}
[context release];
[super dealloc];
}
@end
#endif /* SDL_VIDEO_DRIVER_UIKIT */
/* vi: set ts=4 sw=4 expandtab: */