1 #import "ES2Renderer.h"

2 #include "istereo.h"

3

4 @implementation ES2Renderer

5

6 // Create an OpenGL ES 2.0 context

7 - (id)init

8 {

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

10 {

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

12

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

14 {

15 [self release];

16 return nil;

17 }

18

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

20 glGenFramebuffers(1, &defaultFramebuffer);

21 glGenRenderbuffers(1, &colorRenderbuffer);

22 glBindFramebuffer(GL_FRAMEBUFFER, defaultFramebuffer);

23 glBindRenderbuffer(GL_RENDERBUFFER, colorRenderbuffer);

24 glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, colorRenderbuffer);

25

26 init();

27 }

28

29 return self;

30 }

31

32 - (void)render

33 {

34 redraw();

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

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

37 //glBindFramebuffer(GL_FRAMEBUFFER, defaultFramebuffer);

38 //glViewport(0, 0, backingWidth, backingHeight);

39

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

41 //glBindRenderbuffer(GL_RENDERBUFFER, colorRenderbuffer);

42 [context presentRenderbuffer:GL_RENDERBUFFER];

43 }

44

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

46 {

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

48 glBindRenderbuffer(GL_RENDERBUFFER, colorRenderbuffer);

49 [context renderbufferStorage:GL_RENDERBUFFER fromDrawable:layer];

50 glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_WIDTH, &backingWidth);

51 glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_HEIGHT, &backingHeight);

52

53 if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE)

54 {

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

56 return NO;

57 }

58

59 return YES;

60 }

61

62 - (void)dealloc

63 {

64 // Tear down GL

65 if (defaultFramebuffer)

66 {

67 glDeleteFramebuffers(1, &defaultFramebuffer);

68 defaultFramebuffer = 0;

69 }

70

71 if (colorRenderbuffer)

72 {

73 glDeleteRenderbuffers(1, &colorRenderbuffer);

74 colorRenderbuffer = 0;

75 }

76

77 if (program)

78 {

79 glDeleteProgram(program);

80 program = 0;

81 }

82

83 // Tear down context

84 if ([EAGLContext currentContext] == context)

85 [EAGLContext setCurrentContext:nil];

86

87 [context release];

88 context = nil;

89

90 [super dealloc];

91 }

92

93 @end