[SOLVED] Transparency = grey?

[Abraxas)]

I just did a half hour forum search and couldnt find an answer so...

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hardguibuttontex[SET_RALLY_POINT] = driver->getTexture("UI/Rally Pointer.BMP");
driver->makeColorKeyTexture(hardguibuttontex[SET_RALLY_POINT], position2d<s32>(0,0));

The black becomes translucent grey.

Could someone point me to a solution? thanks.

[Desconocido]

I could be wrong about this, as i'm too lazy to look it up to be sure. But I want to say .bmp file formats dont support transparency. Try saving as a .png or another format that does support transparency and see if that works.

[roelor]

You want black to be transparancy?
Try these
SetTransparent(true);
SetTransparentColor(SColor(0,255,0,255),driver);
SetBilinearFilter(true);
(look in the 2dgraphics example for more)

[Acki]

I want to say .bmp file formats dont support transparency.

that's why you make a color key texture, so you have transparency with bmp files...


another problem could be the MipMap generation !!!
either you turn it off when loading the texture (usually done for GUI stuff):

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driver->setTextureCreationFlag(video::ETCF_CREATE_MIP_MAPS, false);
hardguibuttontex[SET_RALLY_POINT] = driver->getTexture("UI/Rally Pointer.BMP"); 
driver->setTextureCreationFlag(video::ETCF_CREATE_MIP_MAPS, true);
driver->makeColorKeyTexture(hardguibuttontex[SET_RALLY_POINT], position2d<s32>(0,0));

or you recalculate the mip maps:

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hardguibuttontex[SET_RALLY_POINT] = driver->getTexture("UI/Rally Pointer.BMP");
driver->makeColorKeyTexture(hardguibuttontex[SET_RALLY_POINT], position2d<s32>(0,0));
hardguibuttontex[SET_RALLY_POINT]->regenerateMipMapLevels();

but how do you use the texture afterwards, I do you use draw2DImage() or what ???
maybe the problem is there !?!?!

[Abraxas)]

Hang on this is what I'm doing:

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hardguibuttontex[SET_RALLY_POINT] = driver->getTexture("UI/Rally Pointer.BMP");
driver->makeColorKeyTexture(hardguibuttontex[SET_RALLY_POINT], position2d<s32>(0,0));
hardguibutton[SET_RALLY_POINT] = guienv->addButton(rect<s32>(10,100,50,140), hud[4],SET_RALLY_POINT);;
hardguibutton[SET_RALLY_POINT]->setImage(hardguibuttontex[SET_RALLY_POINT]);
hardguibutton[SET_RALLY_POINT]->setPressedImage(hardguibuttontex[SET_RALLY_POINT], rect<s32>(28,28,100,100));

without the colorkey set, the image is a white reticle on a black background. with that line, the black become transparent grey.

Maybe the gui is doing this?

EDIT: Acki, I tried the mipmap settings, no difference. I can post a screenshot if what I'm describing is vague.

[Acki]

aha !!!
well for buttons you'll have to set it to use the alpha channel, I think:

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hardguibutton[SET_RALLY_POINT]->setUseAlphaChannel(true);

also, are you sure the grey color you see is not the button itself ???
remember that the buttons have a grey color by default !!!

and in general you should turn mip map generation off for gui stuff (can save lots of memory as mip maps are not needed for gui stuff) !!!

[Virion]

and also use

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yourButton->setDrawBorder(false);

to turn off the grey background.

[Abraxas)]

Virion let me know whenever you want a sexual favor