Seems that using GL_INTESITY works (it gets me correct
alpha values in alpha channel but also in the RGB
channels which is a waste of video memory)
--- LiCU A <[EMAIL PROTECTED]> wrote:
> Hello, I'm trying to write a multitexture rendering
> with 2 textures: one diffuse and one alpha
> (grayscale
> bmp). I'm using the following code:
>
> osg::Image* osg_image= new osg::Image;
> osg_image->setFileName("diffuse.tga");
> osg::Texture2D* osg_texture = new osg::Texture2D;
> osg_texture->setImage(osg_image);
> // Use the diffuse texture on the first texture
> unit.
> state->setTextureAttributeAndModes(0, osg_texture,
> osg::StateAttribute::ON);
>
> osg::Image* osg_image2= new osg::Image;
> osg_image2->setFileName("mask.bmp");
> osg::Texture2D* osg_texture2 = new osg::Texture2D;
> // Use the mask texture as alpha channel only.
> osg_texture2->setInternalFormat(GL_ALPHA);
> osg_texture2->setImage(osg_image2);
> // Use the mask texture on the second texture unit.
> state->setTextureAttributeAndModes(1, osg_texture2,
> osg::StateAttribute::ON);
>
> // First texture stage
> osg::TexEnvCombine *te = new osg::TexEnvCombine;
> // Modulate diffuse texture with vertex color.
> te->setCombine_RGB(osg::TexEnvCombine::MODULATE);
> te->setSource0_RGB(osg::TexEnvCombine::PREVIOUS);
> te->setOperand0_RGB(osg::TexEnvCombine::SRC_COLOR);
> te->setSource1_RGB(osg::TexEnvCombine::TEXTURE);
> te->setOperand1_RGB(osg::TexEnvCombine::SRC_COLOR);
> // Alpha doesn't matter.
> te->setCombine_Alpha(osg::TexEnvCombine::REPLACE);
> te->setSource0_Alpha(osg::TexEnvCombine::PREVIOUS);
>
te->setOperand0_Alpha(osg::TexEnvCombine::SRC_ALPHA);
> state->setTextureAttribute(0, te);
>
> // Second texture stage.
> osg::TexEnvCombine *te2 = new osg::TexEnvCombine;
> te2->setCombine_RGB(osg::TexEnvCombine::MODULATE);
> te2->setSource0_RGB(osg::TexEnvCombine::PREVIOUS);
> te2->setOperand0_RGB(osg::TexEnvCombine::SRC_COLOR);
> te2->setSource1_RGB(osg::TexEnvCombine::TEXTURE);
> te2->setOperand1_RGB(osg::TexEnvCombine::SRC_ALPHA);
> te2->setCombine_Alpha(osg::TexEnvCombine::REPLACE);
> te2->setSource0_Alpha(osg::TexEnvCombine::TEXTURE);
>
te2->setOperand0_Alpha(osg::TexEnvCombine::SRC_ALPHA);
> state->setTextureAttribute(1, te2);
>
> Now, alpha texture is always white. I've tried to
> use
> it as luminance and it shows correctly but when I
> use
> it as alpha it is always white? Are there another
> states that needs to be set or is there an opened
> issue with alpha textures on OSG?
>
>
>
>
>
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