1 #include <assert.h>

2 #import "ES2Renderer.h"

3 #include "istereo.h"

4

5 @implementation ES2Renderer

6

7 // Create an OpenGL ES 2.0 context

8 - (id)init

9 {

10 if ((self = [super init]))

11 {

12 context = [[EAGLContext alloc] initWithAPI:kEAGLRenderingAPIOpenGLES2];

13

14 if (!context || ![EAGLContext setCurrentContext:context])

15 {

16 [self release];

17 return nil;

18 }

19

20 // Create default framebuffer object. The backing will be allocated for the current layer in -resizeFromLayer

21 glGenFramebuffers(1, &fbo);

22 glBindFramebuffer(GL_FRAMEBUFFER, fbo);

23

24 glGenRenderbuffers(1, &rbuf_color);

25 glBindRenderbuffer(GL_RENDERBUFFER, rbuf_color);

26 glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, rbuf_color);

27

28 glGenRenderbuffers(1, &rbuf_depth);

29 glBindRenderbuffer(GL_RENDERBUFFER, rbuf_depth);

30 glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, rbuf_depth);

31 assert(glGetError() == GL_NO_ERROR);

32

33 init();

34 }

35

36 return self;

37 }

38

39 - (void)render

40 {

41 redraw();

42 // This application only creates a single default framebuffer which is already bound at this point.

43 // This call is redundant, but needed if dealing with multiple framebuffers.

44 //glBindFramebuffer(GL_FRAMEBUFFER, fbo);

45 //glViewport(0, 0, xsz, ysz);

46

47 // This call is redundant, but needed if dealing with multiple renderbuffers.

48 glBindRenderbuffer(GL_RENDERBUFFER, rbuf_color);

49 [context presentRenderbuffer:GL_RENDERBUFFER];

50 }

51

52 - (BOOL)resizeFromLayer:(CAEAGLLayer *)layer

53 {

54 // Allocate color buffer backing based on the current layer size

55 glBindRenderbuffer(GL_RENDERBUFFER, rbuf_color);

56 [context renderbufferStorage:GL_RENDERBUFFER fromDrawable:layer];

57 glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_WIDTH, &xsz);

58 glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_HEIGHT, &ysz);

59

60 glBindRenderbuffer(GL_RENDERBUFFER, rbuf_depth);

61 glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT16, xsz, ysz);

62

63 if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE)

64 {

65 NSLog(@"Failed to make complete framebuffer object %x", glCheckFramebufferStatus(GL_FRAMEBUFFER));

66 return NO;

67 }

68 assert(glGetError() == GL_NO_ERROR);

69

70 reshape(xsz, ysz);

71

72 return YES;

73 }

74

75

76 - (void)dealloc

77 {

78 // Tear down GL

79 if (fbo)

80 {

81 glDeleteFramebuffers(1, &fbo);

82 fbo = 0;

83 }

84

85 if (rbuf_color)

86 {

87 glDeleteRenderbuffers(1, &rbuf_color);

88 rbuf_color = 0;

89 }

90

91 if (program)

92 {

93 glDeleteProgram(program);

94 program = 0;

95 }

96

97 // Tear down context

98 if ([EAGLContext currentContext] == context)

99 [EAGLContext setCurrentContext:nil];

100

101 [context release];

102 context = nil;

103

104 [super dealloc];

105 }

106

107 @end