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Does stretchrect or UpdateRect take out alpha? Please help!


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#1 Solid_Spy   Members   -  Reputation: 400

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Posted 08 December 2012 - 10:21 AM

This is Directx9, sorry, don't know why it won't let me edit the topic to change the tag -.-

I'm trying to add a surface to another surface, however the alpha doesn't blend, it just shows as white pixels.

For example:

http://i1298.photobu...ha_blending.png

I loaded the HUD surface with LoadSurfaceFromFile, however, i'm not sure if it is loading the alpha or not!

This is the stretchrect code:

d3ddev->StretchRect(tilesurface1, &destrect, backbuffer, &rect, D3DTEXF_NONE);

And this is the LoadSurfaceFromFile code:

d3ddev->CreateOffscreenPlainSurface(1024, 1024, D3DFMT_A8R8G8B8, D3DPOOL_DEFAULT, &tilesurface1, NULL);
D3DXLoadSurfaceFromFile(tilesurface1, NULL, NULL, "Title_Screen_text1.png", NULL, D3DX_DEFAULT, 0, NULL);

I have the backbuffer format set to A8R8G8B8, and also the surface as well, but it still isn't working...

Is there something i am missing? I'm using stretchrect to draw the surface ontop of the backbuffer, is that a bad thing? please help!

Edited by Solid_Spy, 08 December 2012 - 10:32 AM.


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#2 MJP   Moderators   -  Reputation: 10526

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Posted 08 December 2012 - 01:53 PM

StretchRect doesn't really "draw" anything, it basically just does a copy. It won't use alpha-blending even if you enable it with blend states.

I would suggest using ID3DXSprite for something like this. It supports blending, and more complex transformations such as rotations.

#3 Solid_Spy   Members   -  Reputation: 400

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Posted 08 December 2012 - 02:13 PM

StretchRect doesn't really "draw" anything, it basically just does a copy. It won't use alpha-blending even if you enable it with blend states.

I would suggest using ID3DXSprite for something like this. It supports blending, and more complex transformations such as rotations.


Hey, thanks for the help Posted Image

I just did some research, and i decided to use 3d quads to draw the images from now on. Sprites are depricated in Directx11, so i feel that it would be a bad habit to learn how to use them in case i wan't to switch to directx11 in the future, but thanks for the suggestion.

Edited by Solid_Spy, 08 December 2012 - 02:14 PM.





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