How do you make an images transparent areas appear transparent in game?

Started by gchris6810, Oct 30 2012 10:48 AM

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#1 gchris6810 Members - Reputation: 128

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Posted 30 October 2012 - 10:48 AM

Hi,

I have an image I want to use for my game but when rendered the border which is supposed to be transparent appears black! Which, as you can imagine doesn't look very good. Could anyone post me some code to get this working? Thanks in advance for any replies.

I should probably also add I am using DirectX 11.

Edited by gchris6810, 30 October 2012 - 11:17 AM.

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#2 MJP Moderators - Reputation: 5419

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Posted 30 October 2012 - 02:54 PM

You probably want to use a blend state that has alpha blending enabled. When you initialize your program, create a blend state with the following settings:

D3D11_BLEND_DESC blendDesc;
    blendDesc.AlphaToCoverageEnable = false;
    blendDesc.IndependentBlendEnable = true;
    for (UINT i = 0; i < 8; ++i)
    {
	    blendDesc.RenderTarget[i].BlendEnable = true;
	    blendDesc.RenderTarget[i].BlendOp = D3D11_BLEND_OP_ADD;
	    blendDesc.RenderTarget[i].BlendOpAlpha = D3D11_BLEND_OP_ADD;
	    blendDesc.RenderTarget[i].DestBlend = D3D11_BLEND_INV_SRC_ALPHA;
	    blendDesc.RenderTarget[i].DestBlendAlpha = D3D11_BLEND_ONE;
	    blendDesc.RenderTarget[i].RenderTargetWriteMask = D3D11_COLOR_WRITE_ENABLE_ALL;
	    blendDesc.RenderTarget[i].SrcBlend = D3D11_BLEND_SRC_ALPHA;
	    blendDesc.RenderTarget[i].SrcBlendAlpha = D3D11_BLEND_ONE;
    }
    blendDesc.RenderTarget[0].BlendEnable = true;

Then before you draw, set that blend state on the context using OMSetBlendState.

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