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glTexCoord2 error!

Started by masterviking Jun 30, 2006 at 8:58 AM 2 replies 1.3k views

Original Post

Jun 30, 2006 at 8:58 AM

The "Red Book" says that glTexCoord2i should be used when you want to specify real texture coordinates! But it is clearly not true, when I give the arguments (0,20) it will repeat the texture 20 times! Please help! There must be a new function (the "red book" is old) that works fast, because if you first have to get the width, height, & then divide your real texture values by it -- it whould be slower & extra ugly code.

RobTheBloke

Jun 30, 2006 at 9:06 AM

glMatrixMode(GL_TEXTURE);glPushMatrix();// scale the texture coords by 1.0f/(image_width-1)glScalef( 1.0f/(image_width-1),1.0f/(image_height-1), 1.0f );glMatrixMode(GL_MODELVIEW);// draw objectglMatrixMode(GL_TEXTURE);// return texture matrix to defaultglPopMatrix();glMatrixMode(GL_MODELVIEW);

masterviking

Jun 30, 2006 at 9:30 AM

Hmm.. Verry weird that one have to even touch the texture matrix! But this solution perfectly fits my code, thank you!

Brother Bob

Jun 30, 2006 at 10:04 AM

You should scale by 1/texture_width and 1/texture_height, not 1/(texture_width-1) and 1/(texture_height-1).

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