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1 #include <assert.h>
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2 #import "ES2Renderer.h"
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3 #include "istereo.h"
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4
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5 @implementation ES2Renderer
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6
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7 // Create an OpenGL ES 2.0 context
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8 - (id)init
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9 {
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10 if ((self = [super init]))
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11 {
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12 context = [[EAGLContext alloc] initWithAPI:kEAGLRenderingAPIOpenGLES2];
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13
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14 if (!context || ![EAGLContext setCurrentContext:context])
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15 {
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16 [self release];
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17 return nil;
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18 }
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19
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20 // Create default framebuffer object. The backing will be allocated for the current layer in -resizeFromLayer
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21 glGenFramebuffers(1, &fbo);
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22 glBindFramebuffer(GL_FRAMEBUFFER, fbo);
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23
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24 glGenRenderbuffers(1, &rbuf_color);
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25 glBindRenderbuffer(GL_RENDERBUFFER, rbuf_color);
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26 glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, rbuf_color);
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27
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28 glGenRenderbuffers(1, &rbuf_depth);
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29 glBindRenderbuffer(GL_RENDERBUFFER, rbuf_depth);
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30 glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, rbuf_depth);
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31 assert(glGetError() == GL_NO_ERROR);
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32
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33 init();
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34 }
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35
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36 return self;
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37 }
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38
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39 - (void)render
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40 {
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41 redraw();
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42 // This application only creates a single default framebuffer which is already bound at this point.
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43 // This call is redundant, but needed if dealing with multiple framebuffers.
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44 //glBindFramebuffer(GL_FRAMEBUFFER, fbo);
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45 //glViewport(0, 0, xsz, ysz);
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46
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47 // This call is redundant, but needed if dealing with multiple renderbuffers.
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48 glBindRenderbuffer(GL_RENDERBUFFER, rbuf_color);
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49 [context presentRenderbuffer:GL_RENDERBUFFER];
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50 }
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51
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52 - (BOOL)resizeFromLayer:(CAEAGLLayer *)layer
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53 {
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54 // Allocate color buffer backing based on the current layer size
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55 glBindRenderbuffer(GL_RENDERBUFFER, rbuf_color);
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56 [context renderbufferStorage:GL_RENDERBUFFER fromDrawable:layer];
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57 glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_WIDTH, &xsz);
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58 glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_HEIGHT, &ysz);
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59
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60 glBindRenderbuffer(GL_RENDERBUFFER, rbuf_depth);
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61 glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT16, xsz, ysz);
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62
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63 if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE)
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64 {
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65 NSLog(@"Failed to make complete framebuffer object %x", glCheckFramebufferStatus(GL_FRAMEBUFFER));
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66 return NO;
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67 }
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68 assert(glGetError() == GL_NO_ERROR);
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69
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70 reshape(xsz, ysz);
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71
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72 return YES;
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73 }
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74
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75
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76 - (void)dealloc
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77 {
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78 // Tear down GL
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79 if (fbo)
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80 {
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81 glDeleteFramebuffers(1, &fbo);
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82 fbo = 0;
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83 }
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84
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85 if (rbuf_color)
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86 {
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87 glDeleteRenderbuffers(1, &rbuf_color);
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88 rbuf_color = 0;
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89 }
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90
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91 if (program)
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92 {
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93 glDeleteProgram(program);
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94 program = 0;
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95 }
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96
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97 // Tear down context
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98 if ([EAGLContext currentContext] == context)
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99 [EAGLContext setCurrentContext:nil];
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100
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101 [context release];
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102 context = nil;
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103
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104 [super dealloc];
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105 }
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106
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107 @end
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