Mercurial > sdl-ios-xcode
annotate src/video/uikit/SDL_uikitopenglview.m @ 5212:115fff0641ee
Prefer the OpenGL ES 2.0 context when it's available, make it possible to create an OpenGL 2.0 context on iPhoneOS
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Sun, 06 Feb 2011 10:22:25 -0800 |
| parents | 5f09cb749d75 |
| children | b530ef003506 |
| 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 majorVersion:(int)majorVersion \ |
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51 { |
| 5132 | 52 NSString *colorFormat=nil; |
| 53 GLuint depthBufferFormat; | |
| 54 BOOL useDepthBuffer; | |
| 55 | |
| 56 if (rBits == 8 && gBits == 8 && bBits == 8) { | |
| 57 /* if user specifically requests rbg888 or some color format higher than 16bpp */ | |
| 58 colorFormat = kEAGLColorFormatRGBA8; | |
| 59 } | |
| 60 else { | |
| 61 /* default case (faster) */ | |
| 62 colorFormat = kEAGLColorFormatRGB565; | |
| 63 } | |
| 64 | |
| 65 if (depthBits == 24) { | |
| 66 useDepthBuffer = YES; | |
| 67 depthBufferFormat = GL_DEPTH_COMPONENT24_OES; | |
| 68 } | |
| 69 else if (depthBits == 0) { | |
| 70 useDepthBuffer = NO; | |
| 71 } | |
| 72 else { | |
| 73 /* default case when depth buffer is not disabled */ | |
| 74 /* | |
| 75 strange, even when we use this, we seem to get a 24 bit depth buffer on iPhone. | |
| 76 perhaps that's the only depth format iPhone actually supports | |
| 77 */ | |
| 78 useDepthBuffer = YES; | |
| 79 depthBufferFormat = GL_DEPTH_COMPONENT16_OES; | |
| 80 } | |
| 81 | |
| 82 if ((self = [super initWithFrame:frame])) { | |
| 83 // Get the layer | |
| 84 CAEAGLLayer *eaglLayer = (CAEAGLLayer *)self.layer; | |
| 85 | |
| 86 eaglLayer.opaque = YES; | |
| 87 eaglLayer.drawableProperties = [NSDictionary dictionaryWithObjectsAndKeys: | |
| 88 [NSNumber numberWithBool: retained], kEAGLDrawablePropertyRetainedBacking, colorFormat, kEAGLDrawablePropertyColorFormat, nil]; | |
| 89 | |
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90 if (majorVersion > 1) { |
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91 context = [[EAGLContext alloc] initWithAPI: kEAGLRenderingAPIOpenGLES2]; |
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92 } else { |
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93 context = [[EAGLContext alloc] initWithAPI: kEAGLRenderingAPIOpenGLES1]; |
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94 } |
| 5132 | 95 if (!context || ![EAGLContext setCurrentContext:context]) { |
| 96 [self release]; | |
| 97 return nil; | |
| 98 } | |
| 99 | |
| 100 /* create the buffers */ | |
| 101 glGenFramebuffersOES(1, &viewFramebuffer); | |
| 102 glGenRenderbuffersOES(1, &viewRenderbuffer); | |
| 103 | |
| 104 glBindFramebufferOES(GL_FRAMEBUFFER_OES, viewFramebuffer); | |
| 105 glBindRenderbufferOES(GL_RENDERBUFFER_OES, viewRenderbuffer); | |
| 106 [context renderbufferStorage:GL_RENDERBUFFER_OES fromDrawable:(CAEAGLLayer*)self.layer]; | |
| 107 glFramebufferRenderbufferOES(GL_FRAMEBUFFER_OES, GL_COLOR_ATTACHMENT0_OES, GL_RENDERBUFFER_OES, viewRenderbuffer); | |
| 108 | |
| 109 glGetRenderbufferParameterivOES(GL_RENDERBUFFER_OES, GL_RENDERBUFFER_WIDTH_OES, &backingWidth); | |
| 110 glGetRenderbufferParameterivOES(GL_RENDERBUFFER_OES, GL_RENDERBUFFER_HEIGHT_OES, &backingHeight); | |
| 111 | |
| 112 if (useDepthBuffer) { | |
| 113 glGenRenderbuffersOES(1, &depthRenderbuffer); | |
| 114 glBindRenderbufferOES(GL_RENDERBUFFER_OES, depthRenderbuffer); | |
| 115 glRenderbufferStorageOES(GL_RENDERBUFFER_OES, depthBufferFormat, backingWidth, backingHeight); | |
| 116 glFramebufferRenderbufferOES(GL_FRAMEBUFFER_OES, GL_DEPTH_ATTACHMENT_OES, GL_RENDERBUFFER_OES, depthRenderbuffer); | |
| 117 } | |
| 118 | |
| 119 if(glCheckFramebufferStatusOES(GL_FRAMEBUFFER_OES) != GL_FRAMEBUFFER_COMPLETE_OES) { | |
| 120 return NO; | |
| 121 } | |
| 122 /* end create buffers */ | |
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123 |
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124 /* Use the main screen scale (for retina display support) */ |
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125 if ([[UIScreen mainScreen] respondsToSelector:@selector(scale)]) |
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126 self.contentScaleFactor = [UIScreen mainScreen].scale; |
| 5132 | 127 } |
| 128 return self; | |
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129 } |
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130 |
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131 - (void)setCurrentContext { |
| 5132 | 132 [EAGLContext setCurrentContext:context]; |
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133 } |
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134 |
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135 |
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136 - (void)swapBuffers { |
| 5132 | 137 glBindRenderbufferOES(GL_RENDERBUFFER_OES, viewRenderbuffer); |
| 138 [context presentRenderbuffer:GL_RENDERBUFFER_OES]; | |
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139 } |
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140 |
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141 |
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142 - (void)layoutSubviews { |
| 5132 | 143 [EAGLContext setCurrentContext:context]; |
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144 } |
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145 |
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146 - (void)destroyFramebuffer { |
| 5132 | 147 glDeleteFramebuffersOES(1, &viewFramebuffer); |
| 148 viewFramebuffer = 0; | |
| 149 glDeleteRenderbuffersOES(1, &viewRenderbuffer); | |
| 150 viewRenderbuffer = 0; | |
| 151 | |
| 152 if (depthRenderbuffer) { | |
| 153 glDeleteRenderbuffersOES(1, &depthRenderbuffer); | |
| 154 depthRenderbuffer = 0; | |
| 155 } | |
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156 } |
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157 |
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158 |
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159 - (void)dealloc { |
| 5132 | 160 [self destroyFramebuffer]; |
| 161 if ([EAGLContext currentContext] == context) { | |
| 162 [EAGLContext setCurrentContext:nil]; | |
| 163 } | |
| 164 [context release]; | |
| 165 [super dealloc]; | |
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166 } |
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167 |
| 2859 | 168 @end |
| 5135 | 169 |
| 170 /* vi: set ts=4 sw=4 expandtab: */ |