A quick Q

BlueAvian

Unregistered

Post: #1

Oct 23, 2003 — 05:40 AM

Ok, basically what I'm trying to do is make a full screen view in the main function of the main.m. Now I've been able to make the view, but when I draw a quad and flush the buffer, nothing shows up... here is the code, if you see any problems plz tell me, thx.

main.m -->

Code:

#import <Cocoa/Cocoa.h>

#import "OpenGLViewFS.h"

int main(int argc, const char *argv[])

{

    NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];

    OpenGLViewFS * view = [[OpenGLViewFS alloc] initWithFrame:NSMakeRect( 0, 0, 800, 600 )];

    [[view openGLContext] makeCurrentContext];

    glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );

    glColor3f( 0.0, 1.0, 0.0 );

    glBegin( GL_QUADS );

    {

        glVertex2i( 0, 0 );

        glVertex2i( 1, 0 );

        glVertex2i( 1, 1 );

        glVertex2i( 0, 1 );

    }

    glEnd();

    [[view openGLContext] flushBuffer];

    [pool release];

    return 0;

}

OpenGLViewFS.m -->

Code:

#import "OpenGLViewFS.h"

@implementation OpenGLViewFS

- (id)initWithFrame:(NSRect)frame

{

    self = [super initWithFrame:frame];

    colorBits = 32;

    depthBits = 32;

    NSOpenGLPixelFormatAttribute pixelAttribs[ 16 ];

    int pixNum = 0;

    NSDictionary *fullScreenMode;

    NSOpenGLPixelFormat *pixelFormat;

    pixelAttribs[ pixNum++ ] = NSOpenGLPFADoubleBuffer;

    pixelAttribs[ pixNum++ ] = NSOpenGLPFAAccelerated;

    pixelAttribs[ pixNum++ ] = NSOpenGLPFAColorSize;

    pixelAttribs[ pixNum++ ] = colorBits;

    pixelAttribs[ pixNum++ ] = NSOpenGLPFADepthSize;

    pixelAttribs[ pixNum++ ] = depthBits;

    pixelAttribs[ pixNum++ ] = NSOpenGLPFAFullScreen;

      fullScreenMode = (NSDictionary *) CGDisplayBestModeForParameters(

                                           kCGDirectMainDisplay,

                                           colorBits, frame.size.width,

                                           frame.size.height, NULL );

    CGDisplayCapture( kCGDirectMainDisplay );

    CGDisplayHideCursor( kCGDirectMainDisplay );

    CGDisplaySwitchToMode( kCGDirectMainDisplay,(CFDictionaryRef) fullScreenMode );

    pixelAttribs[ pixNum ] = 0;

    pixelFormat = [ [ NSOpenGLPixelFormat alloc ]

                   initWithAttributes:pixelAttribs ];

    [self setPixelFormat:pixelFormat];

    [[self openGLContext] makeCurrentContext];

    glMatrixMode( GL_PROJECTION );

    glLoadIdentity();

    gluOrtho2D( 0, 2, 0, 2 );

    glClearColor( 0.0, 0.0, 0.0, 1.0 );

    //glShadeModel( GL_FLAT );

    //glEnable( GL_TEXTURE_2D );

    //glEnable( GL_CULL_FACE );

    //glPixelStorei(GL_UNPACK_ALIGNMENT, 1);

    return self;

}

@end

DoG

Moderator

Posts: 869
Joined: 2003.01

Post: #2

Oct 23, 2003 — 08:24 AM

Can you post the running app & PB project? Would make it much easier, if I could just download it and play with the source.

I don't see anything wrong right away, but you might wanna try glViewPort() in the setup function.

Don't panic.

Josh

Moderator

Posts: 608
Joined: 2002.04

Post: #3

Oct 23, 2003 — 08:41 AM

Quote:gluOrtho2D( 0, 2, 0, 2 );

That seems kind of weird to me. I believe it should use the width and height of the window. Once you do that, your polygon will only be a 1x1 pixel which is mighty hard to see

Bachus

Unregistered

Post: #4

Oct 23, 2003 — 09:30 AM

As jabber said, try changing the gluOrtho2D call to gluOrtho2D(0, 800, 600, 0); Also try adding: glMatrixMode(GL_MODELVIEW); and glLoadIdentity(); after the ortho call. If that still doesn't work, try using larger numbers in your glVertex2i calls, and add glFrontFace(GL_CW); before glBegin.

If that doesn't work, beats me.

inio

Member

Posts: 145
Joined: 2002.06

Post: #5

Oct 23, 2003 — 10:34 AM

Quote:Originally posted by jabber
That seems kind of weird to me. I believe it should use the width and height of the window.

As it is right now the pixel would fill an area of about 1/4 of the screen. Setting the width and height as you say would make the pixel fill only one pixel.

The parameters to gluOrtho2D are the world-space coordinates that map to the left, right, bottom, and top edges of the viewport (respectively). Increasing right-left or top-bottom will make objects smaller.

"He who breaks a thing to find out what it is, has left the path of wisdom."
- Gandalf the Gray-Hat
Bring Alistair Cooke's America to DVD!

Josh

Moderator

Posts: 608
Joined: 2002.04

Post: #6

Oct 23, 2003 — 02:54 PM

Quote:Originally posted by inio
As it is right now the pixel would fill an area of about 1/4 of the screen. Setting the width and height as you say would make the pixel fill only one pixel.

Right. I said that later on.

inio

Member

Posts: 145
Joined: 2002.06

Post: #7

Oct 23, 2003 — 06:46 PM

Quote:Originally posted by jabber
Right. I said that later on.

Doh, I misread your original post.

"He who breaks a thing to find out what it is, has left the path of wisdom."
- Gandalf the Gray-Hat
Bring Alistair Cooke's America to DVD!