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loading textures

Started by THEBUTCHA666 Feb 1, 2003 at 4:34 AM 0 replies 500+ views

Original Post

Feb 1, 2003 at 4:34 AM

How to load a rectangle of a texture? I normally use D3DXCreateTextureFromFileEx, do i have to write an own texture loader? thebutcha

Bullmax

Feb 1, 2003 at 8:31 AM

You first load the texture in a "IDirect3DTexture8" object with "D3DXCreateTextureFromFileEx(..)". You create a another texture that will contain de portion of the texture you want with "CreateTextureEx(..)" (I think) and you use "CopyRect(..)" to blit texel data from the original texture onto the newly created texture.


  Original           New
*###########*      *-----*
#           # copy | **  |
#   **      # ===> |**** |
#  ****     #      *-**--*
#   **      #
#           #
#           #
*###########*

But you can also load the whole texture and use TU and TV of your vertices to show only a portion of your texture :


  Original
*###########*
# uv1   uv2 #
#  *-**--*  #
#  |**** |  | <=== Vertices TU & TV
#  *-**--*  #   pointing to region
# uv3   uv4 #
#           #
*###########*

/* Bullmax */
-------------
Reality has many forms : good and evil, black and white, yin and yang.

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