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Texture Problems
May 02, 2003 11:28 PM
Hey, i seem to be having a weird problem with OpenGL inside SDL.
I load the texture and create mipmaps and what not, now here''s the problem:
I enable GL_TEXTURE_2D, i bind the texture, and map a quad (for example).
Now everyhting should work (and it does if i do the exact same thing in Win32 API), BUT it doesent, it just shows a white quad...
I also cannot see fnots if i try to use them in SDL.
I know it''s an SDL pproblem because i have tryed the exact same code with Win32 API and it works fine...
Any ideas on what is happening? or better yet, how i could fix it?
May 03, 2003 03:36 AM
PLEASE GUYS, i need help; I have been trying to solve this problem for over 2 weeks now, ..and i cannot waste anymore time.
May 03, 2003 05:49 AM
Don''t be so fast to blame SDL. Just because the code works under Win32 doesn''t mean SDL is broken. Do you have a rendering context at the time you create your texture?
May 03, 2003 05:52 AM
No, i didnt.
But i tryed loading the texture once i had a rendering context, and it made no difference, still just a white quad.
But i tryed loading the texture once i had a rendering context, and it made no difference, still just a white quad.
May 03, 2003 10:24 AM
i knocked up a qick test program....
http://bansheeforcestudios.digitalexplosions.com/test.cpp
This is driving me crazy, there is no reason why it shouldnt show these textures, but it doesent...
This totaly has me stumped.
http://bansheeforcestudios.digitalexplosions.com/test.cpp
This is driving me crazy, there is no reason why it shouldnt show these textures, but it doesent...
This totaly has me stumped.
May 03, 2003 10:35 AM
Step through Texture::LoadTexture line by line with a debugger and your problem should be obvious.
May 03, 2003 06:48 PM
I saw one fairly big problem, textureType was being set to 6204 or something because apparently GL_RGB wasent defined, but i fixed that, BUT it still doesent work...
Do you know what the problem actualy is?
If so, PLEASE tell me.
Thnx heaps.
Do you know what the problem actualy is?
If so, PLEASE tell me.
Thnx heaps.
May 03, 2003 10:08 PM
Did you run the code through a debugger as I told you to do?
Take this switch-statement as an example. It's the second of the three in Texture::LoadTexture. This one illustrates the problem best but all three have the same problem.
What is the value of TT? Is it really TGA_Type, which is the only value that will create the texture?
EDIT: Here's a hint. This is where you call Texture::LoadTexture.
[edited by - Brother Bob on May 3, 2003 11:10:35 PM]
Take this switch-statement as an example. It's the second of the three in Texture::LoadTexture. This one illustrates the problem best but all three have the same problem.
switch(TT) { case TGA_Type: textureType = GL_RGB; if(pImage->channels == 4) textureType = GL_RGBA; gluBuild2DMipmaps(GL_TEXTURE_2D, pImage->channels, pImage->sizeX, pImage->sizeY, textureType, GL_UNSIGNED_BYTE, pImage->data); glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR_MIPMAP_NEAREST); glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR_MIPMAP_LINEAR); break; case BMP_Type: // break;} What is the value of TT? Is it really TGA_Type, which is the only value that will create the texture?
EDIT: Here's a hint. This is where you call Texture::LoadTexture.
texture.LoadTexture("face.bmp", "TEST", BMP_Type); ^ | | [edited by - Brother Bob on May 3, 2003 11:10:35 PM]
May 03, 2003 10:18 PM
Ya, that was a type, it should be something like texture.LoadTexture("Image.tga", "TEST", TGA_Type);
but guys, dont worry thnx heaps for helping.
My problem was a mix of loading the texture when there was no rendering context (like the first person said...) and i was initializing SDL incorrectly.
Once again, thank you for all your help.
but guys, dont worry thnx heaps for helping.
My problem was a mix of loading the texture when there was no rendering context (like the first person said...) and i was initializing SDL incorrectly.
Once again, thank you for all your help.
This topic is closed to new replies.
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