glTexImage2D gives 'invalid value' error
Author
I''ve been having some problems with getting some of my tga images to be be created as textures.
I naturally though there was something wrong with my code so I created a hard coded call to the api and that failed too:
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, 640, 128, 0, GL_RGB, GL_UNSIGNED_BYTE, a_Image.GetData());
My card supports 2048x2048 textures. Size of my image data array is 640*128*3 bytes.
The funny thing is, when you call
gluBuild2DMipmaps with the same data(args differ a little) the texture creation works fine.
Which leads me to two possible conclusions:
1) gluBuild2DMipmaps is smarter and fixed some error I''m making.
2) The difference in args is the key.
2 seems more plausable so I check and rechecked the args. they look good to me...
Any thoughts much appreciated...
Many thanks
Chris Brodie
http:\\fourth.flipcode.com
Hi there,
the problem is you are passing a rectangular ( not square )
image, all opengl textures need to be to the power of 2 and
square ( although i believe there are extensions to support
rectangular textures ).
The reason why it works with gluBuild2DMipmaps is that
this scales the image so it is square ( from what I can
gather from the red book ).
Hope it helps
Mark
the problem is you are passing a rectangular ( not square )
image, all opengl textures need to be to the power of 2 and
square ( although i believe there are extensions to support
rectangular textures ).
The reason why it works with gluBuild2DMipmaps is that
this scales the image so it is square ( from what I can
gather from the red book ).
Hope it helps
Mark
hmm... i never knew they textures had to be square. afaik, all they had to have is a height and a width that is a power of 2.
MENTAL
MENTAL
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