Code archives/File Utilities/Load TGA (Targa) With Alpha Map
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| I've been tired of loading textures and then applying alpha channel using a seperate image file since forever. It's been more than a little inconvenient. I got tired and looked up TGA format and it's pretty straight-forward. (.PNG format wasn't so straightforward...) I basically `reversed the polarity' of Skidracer's SaveTGA function to make it load instead of save, checking http://local.wasp.uwa.edu.au/~pbourke/dataformats/tga/ for the TGA specs just incase. I tried this and it worked immediately with a TGA I saved using The Gimp. There are probably some types of TGA it won't load but I estimate that they're the minority. Check out Skidracer's SaveTGA, also in the code archives. | |||||
Function LoadTGA(fn$) fil=ReadFile(fn$) idlength=ReadByte(fil) colourmaptype=ReadByte(fil) imagetype=ReadByte(fil) colourmapindex=ReadShort(fil) colourmapentries=ReadShort(fil) colourmapsize=ReadByte(fil) xorigin=ReadShort(fil) yOrigin=ReadShort(fil) width=ReadShort(fil) height=ReadShort(fil) bitsperpixel=ReadByte(fil) attributes=ReadByte(fil) tex=CreateTexture(width,height,1+2+16+32) b=TextureBuffer(tex) LockBuffer(b) For y=height-1 To 0 Step -1 For x=0 To width-1 col=ReadInt(fil) WritePixelFast(x,y,col,b) Next Next UnlockBuffer(b) CloseFile fil Return tex End Function |
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| I basically `reversed the polarity' of Skidracer's SaveTGA function "The engines cannae trake it, Cap'n - we need more dilithium crystals!" :D Up till now, I'd been using some other TGA Loading functions from the archives, but they did seem a little like overkill with all the messing about with bits and bytes for alpha channels and colour depth, it was just a tad too much for my needs. This on the other hand, is much more straightforwards, and so far has worked perfectly for me! Thanks, Streaksy! |
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| In retrospect I should have allowed texture flags to be passed to the function instead of assuming 1+2+16+32. Easily added. |
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