Not rendering a certain color of a texture

Graphics and GPU Programming Programming

Started by Sfpiano January 25, 2004 01:15 PM

4 comments, last by Sfpiano 20 years, 3 months ago

126

Author

January 25, 2004 01:15 PM

I know this is a dumb question, but I can''t remember how to do it. Say I have my a white background on my texture, and I want to render just the image, not the white background part, how do I do that?

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PlayGGY

122

January 25, 2004 02:06 PM

How are you loading the texture?

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Raloth

379

January 25, 2004 02:11 PM

Use the d3dx functions and supply a color key.

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Sfpiano

126

Author

January 25, 2004 02:20 PM

I tried that:

D3DXCreateTextureFromFileEx(g_pD3DDevice, "reticule.png", D3DX_DEFAULT, D3DX_DEFAULT,									 D3DX_DEFAULT, 0, D3DFMT_UNKNOWN, D3DPOOL_MANAGED,									 D3DX_DEFAULT, D3DX_DEFAULT, D3DCOLOR_XRGB(255, 255, 255), NULL, NULL, &p_ReticuleTex))

Programmer16

2,321

January 25, 2004 11:25 PM

When supplying the colorkey, use D3DCOLOR_ARGB() and supply zero for the alpha bit. So, in your example you would use this:

D3DXCreateTextureFromFileEx(g_pD3DDevice, "reticule.png", D3DX_DEFAULT, D3DX_DEFAULT, D3DX_DEFAULT, 0, D3DFMT_UNKNOWN, D3DPOOL_MANAGED, D3DX_DEFAULT, D3DX_DEFAULT, D3DCOLOR_ARGB(0, 255, 255, 255), NULL, NULL, &p_ReticuleTex));

xyzzy00

307

January 25, 2004 11:32 PM

quote:Original post by Programmer16
When supplying the colorkey, use D3DCOLOR_ARGB() and supply zero for the alpha bit.

Actually, what you are specifying is the color you want D3DX to replace with transparent black. Usually the color you are replacing is opaque. So you should specify 255 for the alpha (or use the D3DCOLOR_XRGB macro).

xyzzy

Not rendering a certain color of a texture

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