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1 //
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2 // EAGLView.m
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3 // MySampleProject
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4 //
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5 // Created by Eric Wing on 7/29/11.
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6 // Copyright 2011 __MyCompanyName__. All rights reserved.
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7 //
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8
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9 #import <QuartzCore/QuartzCore.h>
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10
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11 #import "EAGLView.h"
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12
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13 @interface EAGLView (PrivateMethods)
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14 - (void)createFramebuffer;
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15 - (void)deleteFramebuffer;
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16 @end
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17
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18 @implementation EAGLView
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19
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20 @dynamic context;
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21
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22 // You must implement this method
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23 + (Class)layerClass
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24 {
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25 return [CAEAGLLayer class];
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26 }
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27
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28 //The EAGL view is stored in the nib file. When it's unarchived it's sent -initWithCoder:.
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29 - (id)initWithCoder:(NSCoder*)coder
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30 {
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31 self = [super initWithCoder:coder];
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32 if (self)
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33 {
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34 CAEAGLLayer *eaglLayer = (CAEAGLLayer *)self.layer;
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35
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36 eaglLayer.opaque = TRUE;
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37 eaglLayer.drawableProperties = [NSDictionary dictionaryWithObjectsAndKeys:
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38 [NSNumber numberWithBool:FALSE], kEAGLDrawablePropertyRetainedBacking,
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39 kEAGLColorFormatRGBA8, kEAGLDrawablePropertyColorFormat,
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40 nil];
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41 }
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42
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43 return self;
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44 }
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45
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46 - (void)dealloc
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47 {
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48 [self deleteFramebuffer];
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49 [context release];
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50
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51 [super dealloc];
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52 }
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53
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54 - (EAGLContext *)context
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55 {
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56 return context;
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57 }
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58
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59 - (void)setContext:(EAGLContext *)newContext
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60 {
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61 if (context != newContext)
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62 {
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63 [self deleteFramebuffer];
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64
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65 [context release];
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66 context = [newContext retain];
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67
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68 [EAGLContext setCurrentContext:nil];
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69 }
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70 }
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71
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72 - (void)createFramebuffer
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73 {
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74 if (context && !defaultFramebuffer)
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75 {
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76 [EAGLContext setCurrentContext:context];
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77
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78 // Create default framebuffer object.
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79 glGenFramebuffers(1, &defaultFramebuffer);
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80 glBindFramebuffer(GL_FRAMEBUFFER, defaultFramebuffer);
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81
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82 // Create color render buffer and allocate backing store.
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83 glGenRenderbuffers(1, &colorRenderbuffer);
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84 glBindRenderbuffer(GL_RENDERBUFFER, colorRenderbuffer);
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85 [context renderbufferStorage:GL_RENDERBUFFER fromDrawable:(CAEAGLLayer *)self.layer];
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86 glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_WIDTH, &framebufferWidth);
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87 glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_HEIGHT, &framebufferHeight);
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88
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89 glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, colorRenderbuffer);
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90
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91 if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE)
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92 NSLog(@"Failed to make complete framebuffer object %x", glCheckFramebufferStatus(GL_FRAMEBUFFER));
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93 }
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94 }
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95
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96 - (void)deleteFramebuffer
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97 {
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98 if (context)
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99 {
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100 [EAGLContext setCurrentContext:context];
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101
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102 if (defaultFramebuffer)
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103 {
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104 glDeleteFramebuffers(1, &defaultFramebuffer);
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105 defaultFramebuffer = 0;
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106 }
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107
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108 if (colorRenderbuffer)
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109 {
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110 glDeleteRenderbuffers(1, &colorRenderbuffer);
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111 colorRenderbuffer = 0;
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112 }
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113 }
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114 }
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115
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116 - (void)setFramebuffer
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117 {
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118 if (context)
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119 {
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120 [EAGLContext setCurrentContext:context];
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121
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122 if (!defaultFramebuffer)
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123 [self createFramebuffer];
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124
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125 glBindFramebuffer(GL_FRAMEBUFFER, defaultFramebuffer);
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126
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127 glViewport(0, 0, framebufferWidth, framebufferHeight);
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128 }
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129 }
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130
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131 - (BOOL)presentFramebuffer
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132 {
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133 BOOL success = FALSE;
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134
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135 if (context)
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136 {
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137 [EAGLContext setCurrentContext:context];
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138
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139 glBindRenderbuffer(GL_RENDERBUFFER, colorRenderbuffer);
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140
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141 success = [context presentRenderbuffer:GL_RENDERBUFFER];
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142 }
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143
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144 return success;
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145 }
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146
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147 - (void)layoutSubviews
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148 {
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149 // The framebuffer will be re-created at the beginning of the next setFramebuffer method call.
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150 [self deleteFramebuffer];
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151 }
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152
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153 @end
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