Texture on Texture? DX9

This is a discussion on Texture on Texture? DX9 within the Game Programming forums, part of the General Programming Boards category; Im not sure what the method is called, multitexturing, texture on texture.. basically, i want to put image #1 on ...

  1. #1
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    Texture on Texture? DX9

    Im not sure what the method is called, multitexturing, texture on texture..
    basically, i want to put image #1 on top of image #2 (making only the black part transparent in image #1).

    this is what im using at the moment

    Code:
    g_Device->SetTexture(0, TextureGrass);
    g_Device->SetTexture(1, TextureBlood);
    
    g_Device->SetTextureStageState(1, D3DTSS_TEXCOORDINDEX, 0);
    g_Device->SetTextureStageState(1, D3DTSS_COLOROP, D3DTOP_ADD);
    g_Device->SetTextureStageState(1, D3DTSS_COLORARG1, D3DTA_CURRENT);
    g_Device->SetTextureStageState(1, D3DTSS_COLORARG2, D3DTA_TEXTURE);
    the result is in image #3
    as you can see, the black is transparent, but it blends the other colors with the grass.
    cool effect, but not what im going for.

    Thanks in advance.

  2. #2
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    I would just use color-key transparency for the black color in your "1.jpg".
    "...the results are undefined, and we all know what "undefined" means: it means it works during development, it works during testing, and it blows up in your most important customers' faces." --Scott Meyers

  3. #3
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    When i set the colorkey, it just changes the color to black, i tried changing it to green in the image and it would load it as black, not transparent.

  4. #4
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    ok, so i fixed the black part (it was showing the color i cleared to), i changed my clear color to a lightblue, and as you can see in the image, instead of showing the texture under it, it just goes through the quad.

    heres the code i use

    Code:
    g_Device->SetTexture(0, GrassTexture);
    g_Device->SetTexture(1, BloodTexture);
    
    g_Device->SetTextureStageState(1, D3DTSS_TEXCOORDINDEX, 0);
    g_Device->SetTextureStageState(1, D3DTSS_COLOROP, D3DTOP_SELECTARG1);
    g_Device->SetTextureStageState(1, D3DTSS_COLORARG1, D3DTA_TEXTURE);
    
    g_Device->SetTextureStageState(1, D3DTSS_ALPHAOP, D3DTOP_MODULATE);
    g_Device->SetTextureStageState(1, D3DTSS_ALPHAARG1, D3DTA_TEXTURE);
    g_Device->SetTextureStageState(1, D3DTSS_ALPHAARG2, D3DTA_CURRENT);
    
    g_Device->SetRenderState(D3DRS_SRCBLEND, D3DBLEND_SRCALPHA);
    g_Device->SetRenderState(D3DRS_DESTBLEND, D3DBLEND_INVSRCALPHA);
    
    g_Device->SetRenderState(D3DRS_ALPHABLENDENABLE, true);
    
    g_Device->DrawPrimitiveUP(D3DPT_TRIANGLESTRIP, 2, CurrentTile[x][z]);
    
    g_Device->SetRenderState(D3DRS_ALPHABLENDENABLE, false);
    and heres the image of the result:

  5. #5
    Super Moderator VirtualAce's Avatar
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    You are forgetting about one important channel in order to do this in Direct3D. There is no color-key support in D3D but you can achieve the same effect with alpha blending.

    Set the texture stage alpha blend states and it will work.

  6. #6
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    i know how its done with 1 texture, but ive never tried it with 2 textures, i did set the texture stage alpha blend states though:

    Code:
    g_Device->SetTextureStageState(1, D3DTSS_ALPHAOP, D3DTOP_MODULATE);
    g_Device->SetTextureStageState(1, D3DTSS_ALPHAARG1, D3DTA_TEXTURE);
    g_Device->SetTextureStageState(1, D3DTSS_ALPHAARG2, D3DTA_CURRENT);
    do i need to set the alpha blend states for the 1st texture as well?

  7. #7
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    ive been trying for the past 2 days, using every possible combination i could think of for alpha ops and color ops.. but each time i get half of what i want done (e.g. sometimes the ENTIRE texture is transparent, sometimes the wrong half is)..

    ill summarize what im trying to do:

    i want to know if you can make a certain color in a texture transparent (so you can see through to the texture under it and not through the actual quad). im trying to render a quad with 2 or 3 textures and i want to overlap these textures, but leave some parts transparent to show the texture below it..

    again, any help is appreciated.

    thanks

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