Re: Problem applying texture to rectangle.
Re: Problem applying texture to rectangle.
- Subject: Re: Problem applying texture to rectangle.
- From: Jon Trainer <email@hidden>
- Date: Sun, 3 Jun 2007 08:39:49 -0400
I recently found these two forum discussions about this very issue:
http://www.idevgames.com/forum/showthread.php?
t=11806&highlight=texture+loading
http://www.idevgames.com/forum/showthread.php?t=13651&highlight=texture
Hope this helps...
Jon Trainer
http://outerlevel.com
On Jun 3, 2007, at 12:05 AM, Ian was here wrote:
I am trying to attach a texture to a rectangle. I've
Googled the heck out of this and have tried various
configurations, but cannot get the texture to apply.
All I get is a white rectangle. Can anyone tell me
what's NOT going on here?
- (void)awakeFromNib
{
// Make OpenGL commands render into our GL context.
NSOpenGLContext *glContext = [self openGLContext];
[glContext makeCurrentContext];
cameraEyeX = 1.0;
cameraEyeY = 0.0;
cameraEyeZ = 4.0;
cameraCenterX = 0.0;
cameraCenterY = 0.0;
cameraCenterZ = 0.0;
cameraUpX = 0.0;
cameraUpY = 1.0;
cameraUpZ = 0.0;
// Setup texture image.
glEnable( GL_TEXTURE_2D );
NSImage *image = [NSImage imageNamed:@"myImage"];
NSBitmapImageRep *bitmapImageRep = [[NSBitmapImageRep
alloc] initWithData:[image TIFFRepresentation]];
glGenTextures( 1, &testTexture );
glBindTexture( GL_TEXTURE_2D, testTexture );
glPixelStorei( GL_UNPACK_ROW_LENGTH, [bitmapImageRep
pixelsWide] );
glPixelStorei( GL_UNPACK_ALIGNMENT, 1 );
glTexImage2D( GL_TEXTURE_2D, 0, GL_RGB8,
(GLsizei)[bitmapImageRep pixelsWide],
(GLsizei)[bitmapImageRep pixelsHigh], 0, GL_RGB,
GL_UNSIGNED_BYTE, [bitmapImageRep bitmapData] );
[bitmapImageRep release];
}
- (void)drawRect:(NSRect)rect
{
// Clear the buffers.
glClearColor( 0.0, 0.0, 0.0, 1.0 );
glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
// Set the camera position.
glMatrixMode( GL_MODELVIEW );
glLoadIdentity();
gluLookAt( cameraEyeY * sin( cameraEyeZ ), cameraEyeY
* cos( cameraEyeX ), cameraEyeZ, cameraCenterX,
cameraCenterY, cameraCenterZ, cameraUpX, cameraUpY,
cameraUpZ );
// Draw a rectangle with the texture image applied
to it.
glBegin( GL_QUADS );
glTexCoord2f( 0.0, 0.0 );
glVertex3f( -2.0, -2.0, 0.0 );
glTexCoord2f( 0.0, 1.0 );
glVertex3f( -2.0, 2.0, 0.0 );
glTexCoord2f( 1.0, 1.0 );
glVertex3f( 2.0, 2.0, 0.0 );
glTexCoord2f( 1.0, 0.0 );
glVertex3f( 2.0, -2.0, 0.0 );
glEnd();
glFlush();
}
Thanks!
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