1 /* |
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2 SDL - Simple DirectMedia Layer |
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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 { |
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40 return [CAEAGLLayer class]; |
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41 } |
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42 |
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43 - (id)initWithFrame:(CGRect)frame \ |
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44 retainBacking:(BOOL)retained \ |
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45 rBits:(int)rBits \ |
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46 gBits:(int)gBits \ |
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47 bBits:(int)bBits \ |
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48 aBits:(int)aBits \ |
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49 depthBits:(int)depthBits \ |
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50 { |
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51 |
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52 NSString *colorFormat=nil; |
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53 GLuint depthBufferFormat; |
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54 BOOL useDepthBuffer; |
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55 |
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56 if (rBits == 8 && gBits == 8 && bBits == 8) { |
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57 /* if user specifically requests rbg888 or some color format higher than 16bpp */ |
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58 colorFormat = kEAGLColorFormatRGBA8; |
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59 } |
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60 else { |
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61 /* default case (faster) */ |
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62 colorFormat = kEAGLColorFormatRGB565; |
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63 } |
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64 |
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65 if (depthBits == 24) { |
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66 useDepthBuffer = YES; |
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67 depthBufferFormat = GL_DEPTH_COMPONENT24_OES; |
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68 } |
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69 else if (depthBits == 0) { |
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70 useDepthBuffer = NO; |
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71 } |
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72 else { |
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73 /* default case when depth buffer is not disabled */ |
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74 /* |
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75 strange, even when we use this, we seem to get a 24 bit depth buffer on iPhone. |
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76 perhaps that's the only depth format iPhone actually supports |
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77 */ |
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78 useDepthBuffer = YES; |
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79 depthBufferFormat = GL_DEPTH_COMPONENT16_OES; |
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80 } |
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81 |
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82 |
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83 // we invert heigh and size to get q landscape mode up |
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84 CGRect rect = [[UIScreen mainScreen] bounds]; |
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85 float swapTemp = rect.size.height; |
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86 rect.size.width = rect.size.height; |
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87 rect.size.height = swapTemp; |
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88 |
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89 if ((self = [super initWithFrame:rect])) { |
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90 // Get the layer |
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91 CAEAGLLayer *eaglLayer = (CAEAGLLayer *)self.layer; |
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92 |
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93 eaglLayer.opaque = YES; |
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94 eaglLayer.drawableProperties = [NSDictionary dictionaryWithObjectsAndKeys: |
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95 [NSNumber numberWithBool: retained], kEAGLDrawablePropertyRetainedBacking, colorFormat, kEAGLDrawablePropertyColorFormat, nil]; |
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96 |
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97 context = [[EAGLContext alloc] initWithAPI: kEAGLRenderingAPIOpenGLES1]; |
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98 |
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99 if (!context || ![EAGLContext setCurrentContext:context]) { |
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100 [self release]; |
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101 return nil; |
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102 } |
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103 |
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104 /* create the buffers */ |
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105 glGenFramebuffersOES(1, &viewFramebuffer); |
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106 glGenRenderbuffersOES(1, &viewRenderbuffer); |
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107 |
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108 glBindFramebufferOES(GL_FRAMEBUFFER_OES, viewFramebuffer); |
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109 glBindRenderbufferOES(GL_RENDERBUFFER_OES, viewRenderbuffer); |
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110 [context renderbufferStorage:GL_RENDERBUFFER_OES fromDrawable:(CAEAGLLayer*)self.layer]; |
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111 glFramebufferRenderbufferOES(GL_FRAMEBUFFER_OES, GL_COLOR_ATTACHMENT0_OES, GL_RENDERBUFFER_OES, viewRenderbuffer); |
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112 |
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113 glGetRenderbufferParameterivOES(GL_RENDERBUFFER_OES, GL_RENDERBUFFER_WIDTH_OES, &backingWidth); |
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114 glGetRenderbufferParameterivOES(GL_RENDERBUFFER_OES, GL_RENDERBUFFER_HEIGHT_OES, &backingHeight); |
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115 |
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116 if (useDepthBuffer) { |
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117 glGenRenderbuffersOES(1, &depthRenderbuffer); |
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118 glBindRenderbufferOES(GL_RENDERBUFFER_OES, depthRenderbuffer); |
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119 glRenderbufferStorageOES(GL_RENDERBUFFER_OES, depthBufferFormat, backingWidth, backingHeight); |
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120 glFramebufferRenderbufferOES(GL_FRAMEBUFFER_OES, GL_DEPTH_ATTACHMENT_OES, GL_RENDERBUFFER_OES, depthRenderbuffer); |
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121 } |
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122 |
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123 if(glCheckFramebufferStatusOES(GL_FRAMEBUFFER_OES) != GL_FRAMEBUFFER_COMPLETE_OES) { |
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124 return NO; |
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125 } |
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126 /* end create buffers */ |
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127 } |
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128 return self; |
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129 } |
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130 |
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131 - (void)setCurrentContext { |
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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 { |
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137 glBindRenderbufferOES(GL_RENDERBUFFER_OES, viewRenderbuffer); |
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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 { |
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143 [EAGLContext setCurrentContext:context]; |
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144 } |
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145 |
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146 - (void)destroyFramebuffer { |
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147 |
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148 glDeleteFramebuffersOES(1, &viewFramebuffer); |
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149 viewFramebuffer = 0; |
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150 glDeleteRenderbuffersOES(1, &viewRenderbuffer); |
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151 viewRenderbuffer = 0; |
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152 |
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153 if (depthRenderbuffer) { |
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154 glDeleteRenderbuffersOES(1, &depthRenderbuffer); |
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155 depthRenderbuffer = 0; |
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156 } |
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157 } |
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158 |
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159 |
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160 - (void)dealloc { |
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161 |
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162 [self destroyFramebuffer]; |
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163 if ([EAGLContext currentContext] == context) { |
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164 [EAGLContext setCurrentContext:nil]; |
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165 } |
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166 [context release]; |
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167 [super dealloc]; |
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168 |
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169 } |
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170 |
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171 @end |
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