DirectX 9 Image Masking Without Shaders

Shenjoku · 2012-07-02T02:18:51

I'm trying to figure out what the most efficient method is of applying an alpha transparency mask to a DirectX 9 texture in memory without using shaders. The current idea for implementing it is to do something like the following: LPDIRECT3DTEXTURE9 texture, mask; // Get the texture and the mask to apply from somewhere. texture->Lock(); mask->Lock(); // Copy only the alpha channel from the mask into the texture, effectively applying the mask. for (int32u i = 0; i < textureWIdth; ++i) { textureBits.alpha = maskBits.alpha; } texture->Unlock(); mask->Unlock(); As you can see, this is a rather brute force method that would end up being extremely slow on large images, but I don't know of anything in DirectX 9 for doing this besides using shaders. So my question to all of you: Are there any DirectX helper function that can be used to obtain the same results? I'm not sure if this changes anything, but the texture I'm trying to apply the mask to is being used in off-screen rendering, so it is a render target.

Graphics and GPU Programming Programming

Started by Shenjoku June 21, 2012 02:50 AM

9 comments, last by Shenjoku 11 years, 9 months ago

Shenjoku

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July 02, 2012 02:18 AM

Oh that's cool! That would be helpful if I needed them to be exactly the same, which I do for now, but eventually they are going to have to be calculated separately and will have different values potentially.

DirectX 9 Image Masking Without Shaders

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DirectX 9 Image Masking Without Shaders

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