Définir la largeur et la hauteur du Renderbuffer (Open GL ES)

Question

Je rencontre actuellement un problème avec un rendererbuffer Open GL ES où le support et la largeur sont tous deux réglés sur 15. Y at-il un moyen de les définir à la largeur de 320 et 480? Mon projet est construit sur la classe EAGLView d'Apple et ES1Renderer, mais je l'ai déplacé du délégué de l'application à un contrôleur. J'ai également déplacé le CADisplayLink en dehors de celui-ci (je mets à jour ma logique de jeu avec l'horodatage de ceci)

Toute aide serait grandement appréciée.

j'ajouter le GLView à la fenêtre comme suit:

CGRect applicationFrame = [[UIScreen mainScreen] applicationFrame]; 
    [window addSubview:gameController.glview]; 
    [window makeKeyAndVisible]; 

Je synthétisent le contrôleur et le GLView en son sein. L'EAGLView et le Renderer sont autrement non modifiés.

Renderer Initialisation:

// Get the layer 
    CAEAGLLayer *eaglLayer = (CAEAGLLayer *)self.layer; 

    eaglLayer.opaque = TRUE; 
    eaglLayer.drawableProperties = [NSDictionary dictionaryWithObjectsAndKeys: 
            [NSNumber numberWithBool:FALSE], kEAGLDrawablePropertyRetainedBacking, kEAGLColorFormatRGBA8, kEAGLDrawablePropertyColorFormat, nil]; 

    renderer = [[ES1Renderer alloc] init]; 

Render "redimensionner de la couche" Méthode

- (BOOL)resizeFromLayer:(CAEAGLLayer *)layer 
{ 
    // Allocate color buffer backing based on the current layer size 
    glBindRenderbufferOES(GL_RENDERBUFFER_OES, colorRenderbuffer); 
    [context renderbufferStorage:GL_RENDERBUFFER_OES fromDrawable:layer]; 
    glGetRenderbufferParameterivOES(GL_RENDERBUFFER_OES, GL_RENDERBUFFER_WIDTH_OES, &backingWidth); 
    glGetRenderbufferParameterivOES(GL_RENDERBUFFER_OES, GL_RENDERBUFFER_HEIGHT_OES, &backingHeight); 

    NSLog(@"Backing Width:%i and Height: %i", backingWidth, backingHeight); 

    if (glCheckFramebufferStatusOES(GL_FRAMEBUFFER_OES) != GL_FRAMEBUFFER_COMPLETE_OES) 
    { 
     NSLog(@"Failed to make complete framebuffer object %x", glCheckFramebufferStatusOES(GL_FRAMEBUFFER_OES)); 
     return NO; 
    } 

return YES; 

}

Answer 1

Au moment où vous appelez renderbufferStorage: fromDrawable :, ce qui est layer.bounds? La largeur en pixels et la hauteur de votre rendu sont allouées pour correspondre à layer.bounds.size.

Answer 2

À partir de la documentation Apple elle-même. A parfaitement fonctionné pour moi:

- (UIImage*)snapshot:(UIView*)eaglview { 
    GLint backingWidth, backingHeight; 
// Bind the color renderbuffer used to render the OpenGL ES view 
// If your application only creates a single color renderbuffer which is already bound at this point, 
// this call is redundant, but it is needed if you're dealing with multiple renderbuffers. 
// Note, replace "_colorRenderbuffer" with the actual name of the renderbuffer object defined in your class. 
glBindRenderbufferOES(GL_RENDERBUFFER_OES, _colorRenderbuffer); 

// Get the size of the backing CAEAGLLayer 
glGetRenderbufferParameterivOES(GL_RENDERBUFFER_OES, GL_RENDERBUFFER_WIDTH_OES, &backingWidth); 
glGetRenderbufferParameterivOES(GL_RENDERBUFFER_OES, GL_RENDERBUFFER_HEIGHT_OES, &backingHeight); 

NSInteger x = 0, y = 0, width = backingWidth, height = backingHeight; 
NSInteger dataLength = width * height * 4; 
GLubyte *data = (GLubyte*)malloc(dataLength * sizeof(GLubyte)); 

// Read pixel data from the framebuffer 
glPixelStorei(GL_PACK_ALIGNMENT, 4); 
glReadPixels(x, y, width, height, GL_RGBA, GL_UNSIGNED_BYTE, data); 

// Create a CGImage with the pixel data 
// If your OpenGL ES content is opaque, use kCGImageAlphaNoneSkipLast to ignore the alpha channel 
// otherwise, use kCGImageAlphaPremultipliedLast 
CGDataProviderRef ref = CGDataProviderCreateWithData(NULL, data, dataLength, NULL); 
CGColorSpaceRef colorspace = CGColorSpaceCreateDeviceRGB(); 
CGImageRef iref = CGImageCreate(width, height, 8, 32, width * 4, colorspace, kCGBitmapByteOrder32Big | kCGImageAlphaPremultipliedLast, 
           ref, NULL, true, kCGRenderingIntentDefault); 

// OpenGL ES measures data in PIXELS 
// Create a graphics context with the target size measured in POINTS 
NSInteger widthInPoints, heightInPoints; 
if (NULL != UIGraphicsBeginImageContextWithOptions) { 
    // On iOS 4 and later, use UIGraphicsBeginImageContextWithOptions to take the scale into consideration 
    // Set the scale parameter to your OpenGL ES view's contentScaleFactor 
    // so that you get a high-resolution snapshot when its value is greater than 1.0 
    CGFloat scale = eaglview.contentScaleFactor; 
    widthInPoints = width/scale; 
    heightInPoints = height/scale; 
    UIGraphicsBeginImageContextWithOptions(CGSizeMake(widthInPoints, heightInPoints), NO, scale); 
} 
else { 
    // On iOS prior to 4, fall back to use UIGraphicsBeginImageContext 
    widthInPoints = width; 
    heightInPoints = height; 
    UIGraphicsBeginImageContext(CGSizeMake(widthInPoints, heightInPoints)); 
} 

CGContextRef cgcontext = UIGraphicsGetCurrentContext(); 

// UIKit coordinate system is upside down to GL/Quartz coordinate system 
// Flip the CGImage by rendering it to the flipped bitmap context 
CGContextSetBlendMode(cgcontext, kCGBlendModeCopy); 
CGContextDrawImage(cgcontext, CGRectMake(0.0, 0.0, widthInPoints, heightInPoints), iref); 

// Retrieve the UIImage from the current context 
UIImage *image = UIGraphicsGetImageFromCurrentImageContext(); 

UIGraphicsEndImageContext(); 

// Clean up 
free(data); 
CFRelease(ref); 
CFRelease(colorspace); 
CGImageRelease(iref); 

return image; 
}