plib-users

Re: [Plib-users] Texture with transparency

[Dave M. <dp...@ef...>]

I don't think there is any way to pass a color kty for transparency to PLIB.
You need to convert your texture to a SGI image and give it an alpha channel
or come up with a clever use of glBlendFunc to get the desired result.
Anyone know the right Blend function to use?

At 3/13/00 11:03:00 PM, you wrote:
>Hi all,
>
>I will load a bmp as texture with the ssgTexture. Then I need to define
>the color black as transparency that means all pixels of he image with
>the color black must have a alpha-value 0.
>Has anybody an code-example, which can do this work ?
>
>Michael
>
>
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Re: [Plib-users] Texture with transparency

[Dave M. <dp...@ef...>]

Michael wrote:
>I have loaded a texture with  the following function
>
> // Load of a BMP-Image with the Library PLIB
>    void FDS_Load_Image_BMP(char *filename)
> {
>    tex_list = new ssgTexture ( filename ) ;
> }
>
>I works well.
>
>But now I have to know the width and height of  the texture and the
>raster, in order to manipulate the alpha values. How can I get these
>informations?
>

tex_list->getHandle() gives you the OpenGL handle
glGetTexLevelParameter and glGetTexImage returns what you need