DirectX 8 Transparent Textures

This is a discussion on DirectX 8 Transparent Textures within the Game Programming forums, part of the General Programming Boards category; hi all, can any 1 help me on this .i cant seem to get a texture to b transparent i ...

  1. #1
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    DirectX 8 Transparent Textures

    hi all,
    can any 1 help me on this .i cant seem to get a texture to b transparent i have been al over google and various websites but nothing im using windows xp dev-c++ 4.9.8.0 and dx8.1 sdk the code compiles fine but i cant get it transparent wether theres something i missed out or its the bmp or what i dunn0 i spent like 2 days messing with alpha blending and alpha channels etc.. is that the right approach to it or is it rong and if so what can i do to correct it or can u give me a link or tutorial for this.......

    PLEASE HELP ME!!

    lol
    if u want ne more info just ask me
    Last edited by poopy_pants2; 04-06-2003 at 08:29 PM.
    Theres a sucker born every minute, but a swallower is harder to find

  2. #2
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    Make sure you have the memory specified as D3DPOOL_MANAGED. If that doesn't fix it post the code and I will try to help you.

  3. #3
    Banned frenchfry164's Avatar
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    Are you creating your textures using D3DXCreateTextureFromFileEx()? If so, pass the color you wish to be transparent to the Colorkey parameter.

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    yes im doing what french fry said and i have set the color but it just goes black
    Theres a sucker born every minute, but a swallower is harder to find

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    Post your code. Without looking at it , its rather hard to say. Make sure you are setting the texture for your device and setting the color operations.

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    i cant post it now i will upload my project when i get back if u pm me ur email
    Theres a sucker born every minute, but a swallower is harder to find

  7. #7
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    ok i sent it to ur email thx for any help
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    If the color you want to be transparent is black, make sure you supply 0xff000000 as the color key, not 0x00000000.
    The latter disables color-keying.

    Generally, color key should be 0xffrrggbb

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    Question

    what i never said that, the color that i have set to be transparent turns black, the color i have used for transparentcy is 0xFFFF00FF

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    I've been pretty busy but the semester is almost over. I think I'll have some time this week to look at it.

  11. #11
    Banned frenchfry164's Avatar
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    do this in your initialization function:

    Code:
    	D3DDevice->SetRenderState(D3DRS_ALPHABLENDENABLE,  TRUE);
    	D3DDevice->SetRenderState(D3DRS_SRCBLEND, D3DBLEND_SRCALPHA);
    	D3DDevice->SetRenderState(D3DRS_DESTBLEND, D3DBLEND_INVSRCALPHA);
    	D3DDevice->SetTextureStageState(0, D3DTSS_ALPHAOP, D3DTOP_MODULATE);

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    i already have :/
    Theres a sucker born every minute, but a swallower is harder to find

  13. #13
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    1. Enable alpha testing

    2. Run your sample/app using the REFerence rasterizer (D3DDEVTYPE_REF). If the problem persists, then you're definitely doing something wrong.

    If it doesn't, then either you're:
    - Doing something not supported by the card
    - Not setting all the render states required (don't rely on default values)
    - Driver bug (I've seen such alpha blending bugs with unsigned drivers for s3's old cards)

    3. Create a texture filled with your 0xffff00ff color (Using any image processing tool).
    Load the texture, lock it, and loop through it yourself.
    Using the debugger, step into this loop. You'll be able to verify whether the color got replaced with transparent black or not.

  14. #14
    Banned frenchfry164's Avatar
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    What screen format are you using? You need at least 1 alpha bit to do alpha stuff (for example: D3DFORMAT_A1R5G5B5 or D3DFORMAT_A8R8G8B8)

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    im using A8R8B8G8 thx i will try it and also my grfx is radeon 9000 pro 128 ddr w/ ATi catalyst 3.2 should be very capable of running alpha blending :P
    Theres a sucker born every minute, but a swallower is harder to find

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