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1 #import "ES2Renderer.h"
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2 #include "istereo.h"
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3
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4 @implementation ES2Renderer
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5
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6 // Create an OpenGL ES 2.0 context
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7 - (id)init
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8 {
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9 if ((self = [super init]))
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10 {
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11 context = [[EAGLContext alloc] initWithAPI:kEAGLRenderingAPIOpenGLES2];
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12
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13 if (!context || ![EAGLContext setCurrentContext:context])
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14 {
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15 [self release];
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16 return nil;
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17 }
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18
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19 // Create default framebuffer object. The backing will be allocated for the current layer in -resizeFromLayer
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20 glGenFramebuffers(1, &defaultFramebuffer);
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21 glGenRenderbuffers(1, &colorRenderbuffer);
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22 glBindFramebuffer(GL_FRAMEBUFFER, defaultFramebuffer);
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23 glBindRenderbuffer(GL_RENDERBUFFER, colorRenderbuffer);
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24 glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, colorRenderbuffer);
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25
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26 init();
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27 }
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28
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29 return self;
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30 }
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31
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32 - (void)render
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33 {
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34 redraw();
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35 // This application only creates a single default framebuffer which is already bound at this point.
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36 // This call is redundant, but needed if dealing with multiple framebuffers.
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37 //glBindFramebuffer(GL_FRAMEBUFFER, defaultFramebuffer);
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38 //glViewport(0, 0, backingWidth, backingHeight);
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39
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40 // This call is redundant, but needed if dealing with multiple renderbuffers.
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41 //glBindRenderbuffer(GL_RENDERBUFFER, colorRenderbuffer);
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42 [context presentRenderbuffer:GL_RENDERBUFFER];
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43 }
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44
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45 - (BOOL)resizeFromLayer:(CAEAGLLayer *)layer
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46 {
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47 // Allocate color buffer backing based on the current layer size
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48 glBindRenderbuffer(GL_RENDERBUFFER, colorRenderbuffer);
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49 [context renderbufferStorage:GL_RENDERBUFFER fromDrawable:layer];
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50 glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_WIDTH, &backingWidth);
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51 glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_HEIGHT, &backingHeight);
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52
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53 if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE)
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54 {
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55 NSLog(@"Failed to make complete framebuffer object %x", glCheckFramebufferStatus(GL_FRAMEBUFFER));
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56 return NO;
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57 }
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58
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59 reshape(backingWidth, backingHeight);
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60
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61 return YES;
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62 }
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63
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64 - (void)dealloc
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65 {
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66 // Tear down GL
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67 if (defaultFramebuffer)
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68 {
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69 glDeleteFramebuffers(1, &defaultFramebuffer);
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70 defaultFramebuffer = 0;
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71 }
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72
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73 if (colorRenderbuffer)
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74 {
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75 glDeleteRenderbuffers(1, &colorRenderbuffer);
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76 colorRenderbuffer = 0;
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77 }
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78
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79 if (program)
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80 {
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81 glDeleteProgram(program);
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82 program = 0;
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83 }
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84
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85 // Tear down context
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86 if ([EAGLContext currentContext] == context)
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87 [EAGLContext setCurrentContext:nil];
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88
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89 [context release];
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90 context = nil;
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91
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92 [super dealloc];
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93 }
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94
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95 @end
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