Texture matrix problems

OpenGL OpenGL: Basic Coding
1

I have 2 textures which one of them, I need to alter its matrix (scaling.). What I am currently doing is:

bindthefirsttexture();

glPushMatrix();
glMatrixMode(GL_TEXTURE);
glLoadIdentity();

glScalef(2,2,0);
glMatrixMode(GL_MODELVIEW);
glPopMatrix();

bindthesecondtexture();

do some other stuff here.

However, that matrix transformation is applied on the second texture too! What am i doing wrong here?
Thanks

2

I think you need to reset your texture matrix before drawing the second one.

glMatrixMode(GL_TEXTURE);
glLoadIdentity();

3

You need to push the matrix stack after loading the texture matrix, otherwise you’re pushing the modelview stack.

Edit: And pop the stack before switching back to the modelview.

glMatrixMode(GL_TEXTURE);
glPushMatrix();
glLoadIdentity();
do stuff
glPopMatrix();
glMatrixMode(GL_MODELVIEW);
do the other stuff

Hope that helps

[This message has been edited by yakuza (edited 12-08-2002).]

4

Thanks, makes sense.
I will try that later and tell you.

5

That didnt work, it didnt scale the matrix. Any other ideas?

6

Make sure you did your drawing after scaling the texture matrix, but before popping the texture matrix stack, otherwise you lose the changes you made.

glMatrixMode(GL_TEXTURE);
glPushMatrix();
glLoadIdentity();
glScalef();
Draw_stuff_that_uses_scaled_texture_matrix();
glPopMatrix();
glMatrixMode(GL_MODELVIEW);
do the other stuff

7

Correct, thanks!