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IPHONE: Move OpenGL ES context generation to its own method.
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Johannes Schickel committed Feb 20, 2012
1 parent cf44d49 commit d8531a9
Showing 1 changed file with 65 additions and 50 deletions.
115 changes: 65 additions & 50 deletions backends/platform/iphone/iphone_video.m
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Expand Up @@ -268,6 +268,68 @@ + (Class)layerClass {
return [CAEAGLLayer class];
}

- (void)createContext {
CAEAGLLayer *eaglLayer = (CAEAGLLayer *)self.layer;

eaglLayer.opaque = YES;
eaglLayer.drawableProperties = [NSDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithBool:FALSE], kEAGLDrawablePropertyRetainedBacking, kEAGLColorFormatRGB565, kEAGLDrawablePropertyColorFormat, nil];

_context = [[EAGLContext alloc] initWithAPI:kEAGLRenderingAPIOpenGLES1];

// In case creating the OpenGL ES context failed, we will error out here.
if (_context == nil) {
fprintf(stderr, "Could not create OpenGL ES context\n");
exit(-1);
}

if ([EAGLContext setCurrentContext:_context]) {
glGenFramebuffersOES(1, &_viewFramebuffer); printOpenGLError();
glGenRenderbuffersOES(1, &_viewRenderbuffer); printOpenGLError();

glBindFramebufferOES(GL_FRAMEBUFFER_OES, _viewFramebuffer); printOpenGLError();
glBindRenderbufferOES(GL_RENDERBUFFER_OES, _viewRenderbuffer); printOpenGLError();
[_context renderbufferStorage:GL_RENDERBUFFER_OES fromDrawable:(id<EAGLDrawable>)self.layer];

glFramebufferRenderbufferOES(GL_FRAMEBUFFER_OES, GL_COLOR_ATTACHMENT0_OES, GL_RENDERBUFFER_OES, _viewRenderbuffer); printOpenGLError();

// Retrieve the render buffer size. This *should* match the frame size,
// i.e. _fullWidth and _fullHeight.
glGetRenderbufferParameterivOES(GL_RENDERBUFFER_OES, GL_RENDERBUFFER_WIDTH_OES, &_renderBufferWidth); printOpenGLError();
glGetRenderbufferParameterivOES(GL_RENDERBUFFER_OES, GL_RENDERBUFFER_HEIGHT_OES, &_renderBufferHeight); printOpenGLError();

if (glCheckFramebufferStatusOES(GL_FRAMEBUFFER_OES) != GL_FRAMEBUFFER_COMPLETE_OES) {
NSLog(@"Failed to make complete framebuffer object %x.", glCheckFramebufferStatusOES(GL_FRAMEBUFFER_OES));
return;
}

_overlayHeight = _renderBufferWidth;
_overlayWidth = _renderBufferHeight;
_overlayTexWidth = getSizeNextPOT(_overlayHeight);
_overlayTexHeight = getSizeNextPOT(_overlayWidth);

// Since the overlay size won't change the whole run, we can
// precalculate the texture coordinates for the overlay texture here
// and just use it later on.
_overlayTexCoords[0] = _overlayTexCoords[4] = _overlayWidth / (GLfloat)_overlayTexWidth;
_overlayTexCoords[5] = _overlayTexCoords[7] = _overlayHeight / (GLfloat)_overlayTexHeight;

int textureSize = _overlayTexWidth * _overlayTexHeight * 2;
_overlayTexBuffer = (char *)malloc(textureSize);
memset(_overlayTexBuffer, 0, textureSize);

glViewport(0, 0, _renderBufferWidth, _renderBufferHeight); printOpenGLError();
glClearColor(0.0f, 0.0f, 0.0f, 1.0f); printOpenGLError();

glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

glEnable(GL_TEXTURE_2D); printOpenGLError();
glEnableClientState(GL_TEXTURE_COORD_ARRAY); printOpenGLError();
glEnableClientState(GL_VERTEX_ARRAY); printOpenGLError();
}
}

- (id)initWithFrame:(struct CGRect)frame {
self = [super initWithFrame: frame];

Expand All @@ -283,7 +345,6 @@ - (id)initWithFrame:(struct CGRect)frame {
sharedInstance = self;

_keyboardView = nil;
_context = nil;
_screenTexture = 0;
_overlayTexture = 0;
_mouseCursorTexture = 0;
Expand All @@ -308,6 +369,9 @@ - (id)initWithFrame:(struct CGRect)frame {
_overlayTexCoords[4] = _overlayTexCoords[5] =
_overlayTexCoords[6] = _overlayTexCoords[7] = 0;

// Initialize the OpenGL ES context
[self createContext];

return self;
}

Expand Down Expand Up @@ -482,55 +546,6 @@ - (void)initSurface {

//printf("Window: (%d, %d), Surface: (%d, %d), Texture(%d, %d)\n", _fullWidth, _fullHeight, _width, _height, _gameScreenTextureWidth, _gameScreenTextureHeight);

if (_context == nil) {
CAEAGLLayer *eaglLayer = (CAEAGLLayer *)self.layer;

eaglLayer.opaque = YES;
eaglLayer.drawableProperties = [NSDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithBool:FALSE], kEAGLDrawablePropertyRetainedBacking, kEAGLColorFormatRGB565, kEAGLDrawablePropertyColorFormat, nil];

_context = [[EAGLContext alloc] initWithAPI:kEAGLRenderingAPIOpenGLES1];
if (!_context || [EAGLContext setCurrentContext:_context]) {
glGenFramebuffersOES(1, &_viewFramebuffer); printOpenGLError();
glGenRenderbuffersOES(1, &_viewRenderbuffer); printOpenGLError();

glBindFramebufferOES(GL_FRAMEBUFFER_OES, _viewFramebuffer); printOpenGLError();
glBindRenderbufferOES(GL_RENDERBUFFER_OES, _viewRenderbuffer); printOpenGLError();
[_context renderbufferStorage:GL_RENDERBUFFER_OES fromDrawable:(id<EAGLDrawable>)self.layer];
glFramebufferRenderbufferOES(GL_FRAMEBUFFER_OES, GL_COLOR_ATTACHMENT0_OES, GL_RENDERBUFFER_OES, _viewRenderbuffer); printOpenGLError();

glGetRenderbufferParameterivOES(GL_RENDERBUFFER_OES, GL_RENDERBUFFER_WIDTH_OES, &_renderBufferWidth); printOpenGLError();
glGetRenderbufferParameterivOES(GL_RENDERBUFFER_OES, GL_RENDERBUFFER_HEIGHT_OES, &_renderBufferHeight); printOpenGLError();

if (glCheckFramebufferStatusOES(GL_FRAMEBUFFER_OES) != GL_FRAMEBUFFER_COMPLETE_OES) {
NSLog(@"Failed to make complete framebuffer object %x.", glCheckFramebufferStatusOES(GL_FRAMEBUFFER_OES));
return;
}

_overlayHeight = _renderBufferWidth;
_overlayWidth = _renderBufferHeight;
_overlayTexWidth = getSizeNextPOT(_overlayHeight);
_overlayTexHeight = getSizeNextPOT(_overlayWidth);

_overlayTexCoords[0] = _overlayTexCoords[4] = _overlayWidth / (GLfloat)_overlayTexWidth;
_overlayTexCoords[5] = _overlayTexCoords[7] = _overlayHeight / (GLfloat)_overlayTexHeight;

int textureSize = _overlayTexWidth * _overlayTexHeight * 2;
_overlayTexBuffer = (char *)malloc(textureSize);
memset(_overlayTexBuffer, 0, textureSize);

glViewport(0, 0, _renderBufferWidth, _renderBufferHeight); printOpenGLError();
glClearColor(0.0f, 0.0f, 0.0f, 1.0f); printOpenGLError();

glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

glEnable(GL_TEXTURE_2D); printOpenGLError();
glEnableClientState(GL_TEXTURE_COORD_ARRAY); printOpenGLError();
glEnableClientState(GL_VERTEX_ARRAY); printOpenGLError();
}
}

glMatrixMode(GL_PROJECTION);
glLoadIdentity();

Expand Down

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