Copying RGBA values texture->texture
Author
Anyone know of an effective way of copying RGBA values from one texture to another?
Not directly.. and there is no reason to ever make a pure copy of a texture so no. Why do you want to do that? ( maybe there is another , better way to do this)
Author
Splitting all my tiles up into seperate TGA's in my datafile,then only loading the ones used in the map, and when loading i wish to load them all to one texture... i use alpha testing to transparencys though so i need the alpha......
Im just ripping my TGA loader and not really sure how it works
[edited by - TinkleBear on November 19, 2003 1:16:37 AM]
Im just ripping my TGA loader and not really sure how it works
[edited by - TinkleBear on November 19, 2003 1:16:37 AM]
Make a large texture with glTexImage2d, and null as the last value.
then upload each part with glTexSubImage2d..
then upload each part with glTexSubImage2d..
Author
Thanks Mozy,i got another question tho
glTexSubImage2D redefines a contiguous subregion of an existing two-dimensional texture image. The texels referenced by pixels replace the portion of the existing texture array with x indices xoffset and xoffset + width - 1, inclusive, and y indices yoffset and yoffset + height - 1, inclusive.
Okay well whats with the - 1?
glTexSubImage2D redefines a contiguous subregion of an existing two-dimensional texture image. The texels referenced by pixels replace the portion of the existing texture array with x indices xoffset and xoffset + width - 1, inclusive, and y indices yoffset and yoffset + height - 1, inclusive.
Okay well whats with the - 1?
isnt that just to point out that the texures lower left = (0,0) and not (1,1)? i havent thought of that, and it works for me 
quote:Original post by TinkleBear
Thanks Mozy,i got another question tho
glTexSubImage2D redefines a contiguous subregion of an existing two-dimensional texture image. The texels referenced by pixels replace the portion of the existing texture array with x indices xoffset and xoffset + width - 1, inclusive, and y indices yoffset and yoffset + height - 1, inclusive.
Okay well whats with the - 1?
Think about it.
If the region runs from 1 to 1 in x then the width is 1. Ie:
w=xR - xL + 1
So:
xR = w + xL - 1
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