Is the profiler lying/can GL use previous binds/will...
Post: #46
Perhaps my understanding of 3D textures is crap, but I don't think this code:
Should produce this:
![[Image: wtf_tex3d.png]](http://homepage.mac.com/gareth.cross/stuff/wtf_tex3d.png)
I'm asking for the first two textures which are grass and rock. Brick should not appear, and neither should the random colors. (The random colors are a fourth texture, added to make the depth value a power of two.)
Am I doing something incredibly wrong or something?
Thanks!
Code:
glBegin(GL_QUADS);
glTexCoord3i(0,0,0);
glVertex2i(0,0);
glTexCoord3i(1, 0, 1);
glVertex2i(256,0);
glTexCoord3i(1, 1, 1);
glVertex2i(256, 256);
glTexCoord3i(0, 1, 0);
glVertex2i(0, 256);
glEnd();Should produce this:
I'm asking for the first two textures which are grass and rock. Brick should not appear, and neither should the random colors. (The random colors are a fourth texture, added to make the depth value a power of two.)
Am I doing something incredibly wrong or something?
Thanks!
Post: #47
What is the value of depth when creating the texture? It looks like you're specifying 4 rather than 2, which causes those extra textures.
Post: #48
The depth value is 4. I pass a depth of 3 to my function, but it automatically determines the nearest power of 2 and passes it. The extra space is filled with random pixels. The pixel data in the arrays goes like this:
256 * 256 * 3 bytes of picture one.
" " two.
" " three.
256 * 256 * 3 bytes of random pixel colors.
The '* 3' is for components, not BPP.
256 * 256 * 3 bytes of picture one.
" " two.
" " three.
256 * 256 * 3 bytes of random pixel colors.
The '* 3' is for components, not BPP.
Post: #49
You can't do that. If you want to have the 3 textures in there, you will need to keep a value of 4. In order to then only go between grass and dirt, you will need to go from 0 to 0.5. The r coordinate works the same way as the s and t coordinates, where it goes from 0 to 1 regardless of the dimensions. In order to use layer k out of n layers, you're going to need to use an r coordinate of k/(n - 1).
Edit: and to avoid memory issues, you're going to have to do one of two things: make sure that you have space allocated for 4 layers and pass that into glTexImage3D, or pass in NULL for glTexImage3D and use glTexSubImage3D to put in only the 3 textures. (which would also allow you to input the textures 1 at a time if you wanted)
Edit: and to avoid memory issues, you're going to have to do one of two things: make sure that you have space allocated for 4 layers and pass that into glTexImage3D, or pass in NULL for glTexImage3D and use glTexSubImage3D to put in only the 3 textures. (which would also allow you to input the textures 1 at a time if you wanted)
Post: #50akb825 Wrote:You can't do that. If you want to have the 3 textures in there, you will need to keep a value of 4. In order to then only go between grass and dirt, you will need to go from 0 to 0.5. The r coordinate works the same way as the s and t coordinates, where it goes from 0 to 1 regardless of the dimensions. In order to use layer k out of n layers, you're going to need to use an r coordinate of k/(n - 1).
*Stupid stupid stupid stupid me*.
Heh, I should have realized that. Jeeze.
Thanks!
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