Re: Problem running compositions offline...

• Subject: Re: Problem running compositions offline...
• From: Pierre-Olivier Latour <email@hidden>
• Date: Thu, 22 Feb 2007 08:31:04 -0800
• Delivered-to: email@hidden
• Delivered-to: email@hidden

On Feb 22, 2007, at 8:21 AM, Dominik Westner wrote:

Here is the code snippet:

- (id) initWithCompositionPath:(NSString*)path pixelsWide:(unsigned) width pixelsHigh:(unsigned)height
{
NSOpenGLPixelFormatAttribute attributes[] = {
kCGLPFARemotePBuffer,
NSOpenGLPFAPixelBuffer,
NSOpenGLPFANoRecovery,
NSOpenGLPFAAccelerated,
NSOpenGLPFADepthSize, 24,
NSOpenGLPFASamples, 1,
(NSOpenGLPixelFormatAttribute) 0
};
NSOpenGLPixelFormat* format = [[[NSOpenGLPixelFormat alloc] initWithAttributes:attributes] autorelease];

//Check parameters - Rendering at sizes smaller than 16x16 will likely produce garbage
if(![path length] || (width < 16) || (height < 16)) {
[self release];
return nil;
}

if(self = [super init]) {
//Create the OpenGL pixel buffer to render into
_pixelBuffer = [[NSOpenGLPixelBuffer alloc] initWithTextureTarget:GL_TEXTURE_RECTANGLE_EXT textureInternalFormat:GL_RGBA textureMaxMipMapLevel:0 pixelsWide:width pixelsHigh:height];
if(_pixelBuffer == nil) {
NSLog(@"Cannot create OpenGL pixel buffer");
[self release];
return nil;
}

//Create the OpenGL context to render with (with color and depth buffers)
_openGLContext = [[NSOpenGLContext alloc] initWithFormat:format shareContext:nil];
if(_openGLContext == nil) {
NSLog(@"Cannot create OpenGL context");
[self release];
return nil;
}
....

Dominik

On 22.02.2007, at 17:15, Pierre-Olivier Latour wrote:

Hi Pierre-Olivier,

I am running as root and I added the RemotePBuffer attribute to my Pixelformat.

If I have a monitor connected everything is running fine.
Then I unplug the monitor and reboot the machine. After that I get:

2007-02-22 10:02:56.823 ImageService[187] invalid pixel format
2007-02-22 10:02:56.823 ImageService[187] invalid context
2007-02-22 10:02:56.823 ImageService[187] Cannot create OpenGL context

So the RemotePBuffer attribute didn't seem to help. It looks like I have to find a way to make the hardware think there is a monitor connected. Maybe this works:

What are the exact list of attributes you use when creating the OpenGL context?

________________________________________________________
Pierre-Olivier Latour                            	email@hidden
Quartz Composer Team				Apple Computer, Inc.

________________________________________________________
Pierre-Olivier Latour                            	email@hidden
Quartz Composer Team				Apple Computer, Inc.

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