Scaling & offsetting textures

OpenGL OpenGL: Basic Coding
1

Hi All,

Scaling and offsetting textures is very easy like below:

glTexCoord2d(offsetX + scaleX * U, offsetY + scaleY * V);

Is there a way to specify a scale and offset somewhere else and leave the glTexCoord2d() call like below:

glTexCoord2d(U, V);

so we don’t need to recompile the object every time the user changes the texture scale?

Thanks,

Alberto

2

You can do that on the texture matrix.

3

Texture matrix, I’ve never heard about it. Where can I learn more?

Thanks,

Alberto

4

http://glprogramming.com/red/chapter09.html#name17

5

Ah, do you mean?

glMatrixMode(GL_TEXTURE); /* enter texture matrix mode */
glScaled(...); 
glRotated(...);

Thanks,

Alberto

6

yes.