Mercurial > sdl-ios-xcode
annotate src/video/uikit/SDL_uikitopenglview.m @ 5133:ec13e48ee0d9
Fixed bug #1112 (retina display support)
Vittorio Giovara 2011-02-01 02:21:50 PST
with the attached patch, the opengles context will always use the maximum
screensize available; this is particularly useful for supporting retina display
on latest iphone.
please note: Apple documentation warns that using the "upscaled" gl context
actually uses more memory and bandwitdh, so it might be worth to let the user
decide whether to disable it or not, either with a flag or a sdl function...
| author | Sam Lantinga <slouken@libsdl.org> |
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| date | Tue, 01 Feb 2011 08:54:34 -0800 |
| parents | 5690ebc772c7 |
| children | 5f09cb749d75 |
| rev | line source |
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1 /* |
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2 SDL - Simple DirectMedia Layer |
| 2859 | 3 Copyright (C) 1997-2009 Sam Lantinga |
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4 |
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5 This library is free software; you can redistribute it and/or |
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6 modify it under the terms of the GNU Lesser General Public |
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7 License as published by the Free Software Foundation; either |
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8 version 2.1 of the License, or (at your option) any later version. |
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9 |
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10 This library is distributed in the hope that it will be useful, |
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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13 Lesser General Public License for more details. |
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14 |
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15 You should have received a copy of the GNU Lesser General Public |
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16 License along with this library; if not, write to the Free Software |
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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18 |
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19 Sam Lantinga |
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20 slouken@libsdl.org |
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21 */ |
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22 |
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23 #import <QuartzCore/QuartzCore.h> |
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24 #import <OpenGLES/EAGLDrawable.h> |
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25 #import "SDL_uikitopenglview.h" |
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26 |
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27 @interface SDL_uikitopenglview (privateMethods) |
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28 |
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29 - (BOOL) createFramebuffer; |
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30 - (void) destroyFramebuffer; |
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31 |
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32 @end |
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33 |
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34 |
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35 @implementation SDL_uikitopenglview |
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36 |
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37 @synthesize context; |
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38 |
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39 + (Class)layerClass { |
| 5132 | 40 return [CAEAGLLayer class]; |
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41 } |
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42 |
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43 - (id)initWithFrame:(CGRect)frame \ |
| 5132 | 44 retainBacking:(BOOL)retained \ |
| 45 rBits:(int)rBits \ | |
| 46 gBits:(int)gBits \ | |
| 47 bBits:(int)bBits \ | |
| 48 aBits:(int)aBits \ | |
| 49 depthBits:(int)depthBits \ | |
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50 { |
| 5132 | 51 NSString *colorFormat=nil; |
| 52 GLuint depthBufferFormat; | |
| 53 BOOL useDepthBuffer; | |
| 54 | |
| 55 if (rBits == 8 && gBits == 8 && bBits == 8) { | |
| 56 /* if user specifically requests rbg888 or some color format higher than 16bpp */ | |
| 57 colorFormat = kEAGLColorFormatRGBA8; | |
| 58 } | |
| 59 else { | |
| 60 /* default case (faster) */ | |
| 61 colorFormat = kEAGLColorFormatRGB565; | |
| 62 } | |
| 63 | |
| 64 if (depthBits == 24) { | |
| 65 useDepthBuffer = YES; | |
| 66 depthBufferFormat = GL_DEPTH_COMPONENT24_OES; | |
| 67 } | |
| 68 else if (depthBits == 0) { | |
| 69 useDepthBuffer = NO; | |
| 70 } | |
| 71 else { | |
| 72 /* default case when depth buffer is not disabled */ | |
| 73 /* | |
| 74 strange, even when we use this, we seem to get a 24 bit depth buffer on iPhone. | |
| 75 perhaps that's the only depth format iPhone actually supports | |
| 76 */ | |
| 77 useDepthBuffer = YES; | |
| 78 depthBufferFormat = GL_DEPTH_COMPONENT16_OES; | |
| 79 } | |
| 80 | |
| 81 if ((self = [super initWithFrame:frame])) { | |
| 82 // Get the layer | |
| 83 CAEAGLLayer *eaglLayer = (CAEAGLLayer *)self.layer; | |
| 84 | |
| 85 eaglLayer.opaque = YES; | |
| 86 eaglLayer.drawableProperties = [NSDictionary dictionaryWithObjectsAndKeys: | |
| 87 [NSNumber numberWithBool: retained], kEAGLDrawablePropertyRetainedBacking, colorFormat, kEAGLDrawablePropertyColorFormat, nil]; | |
| 88 | |
| 89 context = [[EAGLContext alloc] initWithAPI: kEAGLRenderingAPIOpenGLES1]; | |
| 90 | |
| 91 if (!context || ![EAGLContext setCurrentContext:context]) { | |
| 92 [self release]; | |
| 93 return nil; | |
| 94 } | |
| 95 | |
| 96 /* create the buffers */ | |
| 97 glGenFramebuffersOES(1, &viewFramebuffer); | |
| 98 glGenRenderbuffersOES(1, &viewRenderbuffer); | |
| 99 | |
| 100 glBindFramebufferOES(GL_FRAMEBUFFER_OES, viewFramebuffer); | |
| 101 glBindRenderbufferOES(GL_RENDERBUFFER_OES, viewRenderbuffer); | |
| 102 [context renderbufferStorage:GL_RENDERBUFFER_OES fromDrawable:(CAEAGLLayer*)self.layer]; | |
| 103 glFramebufferRenderbufferOES(GL_FRAMEBUFFER_OES, GL_COLOR_ATTACHMENT0_OES, GL_RENDERBUFFER_OES, viewRenderbuffer); | |
| 104 | |
| 105 glGetRenderbufferParameterivOES(GL_RENDERBUFFER_OES, GL_RENDERBUFFER_WIDTH_OES, &backingWidth); | |
| 106 glGetRenderbufferParameterivOES(GL_RENDERBUFFER_OES, GL_RENDERBUFFER_HEIGHT_OES, &backingHeight); | |
| 107 | |
| 108 if (useDepthBuffer) { | |
| 109 glGenRenderbuffersOES(1, &depthRenderbuffer); | |
| 110 glBindRenderbufferOES(GL_RENDERBUFFER_OES, depthRenderbuffer); | |
| 111 glRenderbufferStorageOES(GL_RENDERBUFFER_OES, depthBufferFormat, backingWidth, backingHeight); | |
| 112 glFramebufferRenderbufferOES(GL_FRAMEBUFFER_OES, GL_DEPTH_ATTACHMENT_OES, GL_RENDERBUFFER_OES, depthRenderbuffer); | |
| 113 } | |
| 114 | |
| 115 if(glCheckFramebufferStatusOES(GL_FRAMEBUFFER_OES) != GL_FRAMEBUFFER_COMPLETE_OES) { | |
| 116 return NO; | |
| 117 } | |
| 118 /* end create buffers */ | |
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119 |
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120 /* Use the main screen scale (for retina display support) */ |
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121 if ([[UIScreen mainScreen] respondsToSelector:@selector(scale)]) |
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122 self.contentScaleFactor = [UIScreen mainScreen].scale; |
| 5132 | 123 } |
| 124 return self; | |
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125 } |
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126 |
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127 - (void)setCurrentContext { |
| 5132 | 128 [EAGLContext setCurrentContext:context]; |
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129 } |
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130 |
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131 |
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132 - (void)swapBuffers { |
| 5132 | 133 glBindRenderbufferOES(GL_RENDERBUFFER_OES, viewRenderbuffer); |
| 134 [context presentRenderbuffer:GL_RENDERBUFFER_OES]; | |
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135 } |
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136 |
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137 |
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138 - (void)layoutSubviews { |
| 5132 | 139 [EAGLContext setCurrentContext:context]; |
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140 } |
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141 |
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142 - (void)destroyFramebuffer { |
| 5132 | 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 } | |
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152 } |
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153 |
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154 |
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155 - (void)dealloc { |
| 5132 | 156 [self destroyFramebuffer]; |
| 157 if ([EAGLContext currentContext] == context) { | |
| 158 [EAGLContext setCurrentContext:nil]; | |
| 159 } | |
| 160 [context release]; | |
| 161 [super dealloc]; | |
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162 } |
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163 |
| 2859 | 164 @end |