Re: OpenGL-10.4.7 incompatibility
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
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