Author
I am writing a tile based map engine.
The tiles are renderd using this code:
glTexCoord2f(0,0); glVertex2f(x*size,y*size);
glTexCoord2f(1,0); glVertex2f(x*size+size,y*size);
glTexCoord2f(1,1); glVertex2f(x*size+size,y*size+size);
glTexCoord2f(0,1); glVertex2f(x*size,y*size+size);
At the edge of each tile there appears a line of semi-random pixels. They use colors from else-where in the image and appear blended-like.
They are draw using default vc6 GL options -depth testing +cull back face (definetly no blending!).
If you want to see it for yourself you can no-longer download Airstrike2. Sorry!
[edited by - krazywest on March 19, 2003 2:01:11 PM]
Author
"Through further testing" i''ve worked out that gl is trying to do seamless tiling (Like gimp and psp will do), possibly because the tiles are beeing stretched, but I haven''t turned it on anywhere..
How the crap do you turn this off???
I have a GeForce4 Ti 4400, but I can''t find a setting that makes it happen.
Also, has anyone else had this or any problem with airstrike2?
How the crap do you turn this off???
I have a GeForce4 Ti 4400, but I can''t find a setting that makes it happen.
Also, has anyone else had this or any problem with airstrike2?
Maybe you post some code on your problem? There''s, however, a suggestion: don''t draw tile positions as floats (e.g if you draw in XY plane, don''t use x = 5.65 and y = 7.55) but use whole numbers - there might be a rounding off problem.
Good luck.
" Do we need us? "
Good luck.
" Do we need us? "
The texture lookup function is looking slightly off the bitmap when exactly at 1.0. The range should be [0,1[.
You can specify this using the 'border' parameter of ::glTexImage2D(), or by setting the texture coordinate at 0.999999. Also, check how you have specified your texture buffer; it may have been 1 pixel shorter than you tell the ::glTexImage2D() et al. function. Also, if you don't have a power-of-2 picture, make sure you specify the correct ::glPixelStorei( GL_UNPACK_ALIGNMENT, XXX ) value that corresponds with the picture width.
-cb
[edited by - cbenoi1 on March 16, 2003 6:50:11 PM]
You can specify this using the 'border' parameter of ::glTexImage2D(), or by setting the texture coordinate at 0.999999. Also, check how you have specified your texture buffer; it may have been 1 pixel shorter than you tell the ::glTexImage2D() et al. function. Also, if you don't have a power-of-2 picture, make sure you specify the correct ::glPixelStorei( GL_UNPACK_ALIGNMENT, XXX ) value that corresponds with the picture width.
-cb
[edited by - cbenoi1 on March 16, 2003 6:50:11 PM]
Also, depending on what type of texture-filter you use, it may be blending any given pixel with the surrounding pixels. For example, using GL_LINEAR, I had to blit from around 1-1.5 pixels in on all borders. Try turning filtering to NEAREST if it''s already not.
Did you set the texture wrap parameters for S and T coordinates to CLAMP_TO_EDGE?
IIRC :
glTexParameteri(GL_TEXTURE_2D, GL_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_WRAP_T, GL_CLAMP_TO_EDGE);
IIRC :
glTexParameteri(GL_TEXTURE_2D, GL_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_WRAP_T, GL_CLAMP_TO_EDGE);
Author
Ok, I had Linear on.
Mipmapping wasn't what I thought it was (meee stuuuuuuuuupid...).
So, is there a way to do linear without rapping it around?
I tried the:
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
idea but it messed up the way I do my transparencies (ie. lots of polygons). Is this because I am stupid or because i'm doing it wrong (the clamping, not the transparanceyyiyngyening)?
[edited by - krazywest on March 17, 2003 3:54:07 PM]
And the answer is... the out of date part of my stupid code that stops the clamp working properly!
[edited by - krazywest on March 18, 2003 2:13:04 PM]
Mipmapping wasn't what I thought it was (meee stuuuuuuuuupid...).
So, is there a way to do linear without rapping it around?
I tried the:
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
idea but it messed up the way I do my transparencies (ie. lots of polygons). Is this because I am stupid or because i'm doing it wrong (the clamping, not the transparanceyyiyngyening)?
[edited by - krazywest on March 17, 2003 3:54:07 PM]
And the answer is... the out of date part of my stupid code that stops the clamp working properly!
[edited by - krazywest on March 18, 2003 2:13:04 PM]
This topic is closed to new replies.
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