• Open Menu Close Menu
  • Apple
  • Shopping Bag
  • Apple
  • Mac
  • iPad
  • iPhone
  • Watch
  • TV
  • Music
  • Support
  • Search apple.com
  • Shopping Bag

Lists

Open Menu Close Menu
  • Terms and Conditions
  • Lists hosted on this site
  • Email the Postmaster
  • Tips for posting to public mailing lists
Re: OpenGL-10.4.7 incompatibility
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: OpenGL-10.4.7 incompatibility


  • Subject: Re: OpenGL-10.4.7 incompatibility
  • From: Steve Christensen <email@hidden>
  • Date: Fri, 30 Jun 2006 14:05:31 -0700


On Jun 30, 2006, at 1:26 PM, nestor cardozo wrote:

Okay, I have identified where the problem in my program is:

When I disable lighting my app works fine in 10.4.7 Intel or ppc.

When lighting is enabled the app only works fine in 10.4.7 ppc.

The initialization code for my NSOpenGLView is in the

initWithCoder: method

The code that I use to define lighting within this method is something like:

	self = [super initWithCoder:c];
	NSOpenGLContext *glContext;
	glContext = [self openGLContext];
	[glContext makeCurrentContext];

// Lights
	GLfloat ambientLight[] = {intAmbient,intAmbient,intAmbient,1.0};
	GLfloat diffuseLight[] = {intDiffuse,intDiffuse,intDiffuse,1.0};
	GLfloat specular [] = {intSpecular, intSpecular, intSpecular, 1.0};
	GLfloat specref[] = {0.5, 0.5, 0.5, 1.0};

	glEnable(GL_LIGHTING);
	glLightfv(GL_LIGHT0, GL_AMBIENT,ambientLight);
	glLightfv(GL_LIGHT0, GL_DIFFUSE,diffuseLight);
	glLightfv(GL_LIGHT0, GL_SPECULAR, specular);
	glEnable(GL_LIGHT0);
	glEnable(GL_COLOR_MATERIAL);
	glColorMaterial(GL_FRONT,GL_AMBIENT_AND_DIFFUSE);
	glMaterialfv(GL_FRONT,GL_SPECULAR,specref);
	glMateriali(GL_FRONT,GL_SHININESS,50);

	// other stuff
	return self;

As I said when I comment the glEnable (GL_LIGHTING) line, everything works fine (except that there are no lights). When I comment the glEnable(GL_COLOR_MATERIAL) line everything shows up well but only in gray.

The strange thing is that my code works well in 10.4.7 ppc, but not 10.4.7 Intel.

First, let me say that I'm not an OpenGL expert by any stretch. That said, is it possible that you're running into an endianness issue with the pixels you're working with? If, for example, they're always arranged big-endian in memory, and GL expects them to be native- endian, then the channels will be in the "wrong" positions within the pixel when running on Intel...


steve

_______________________________________________
Do not post admin requests to the list. They will be ignored.
Cocoa-dev mailing list      (email@hidden)
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden


References: 
 >OpenGL-10.4.7 incompatibility (From: nestor cardozo <email@hidden>)

  • Prev by Date: Re: Re: NSMutableDictionary & Strings - Weird, weird problem
  • Next by Date: Re: Core Data and Bindings - Problem accessing attributes of related entity
  • Previous by thread: OpenGL-10.4.7 incompatibility
  • Next by thread: NSMutableDictionary & Strings - Weird, weird problem
  • Index(es):
    • Date
    • Thread