DirectX 11 transparent blending missing every other texel

Question

I'm trying to render transparent pixels in directX 11 and I'm not sure if I'm supposed to make a shader or if the blend state does this automatically. Earlier I thought it was done automatically but my transparent texture is rendering as a solid color that misses every over texel. The original texture is (7, 7, 7, 139) and the rendered color is (38, 47, 56, 255).

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blendStateDescription.AlphaToCoverageEnable =                   TRUE;
blendStateDescription.IndependentBlendEnable =                  FALSE;
blendStateDescription.RenderTarget[0].BlendEnable =             TRUE;
blendStateDescription.RenderTarget[0].BlendOp =                 D3D11_BLEND_OP_ADD;
blendStateDescription.RenderTarget[0].BlendOpAlpha =            D3D11_BLEND_OP_ADD;
blendStateDescription.RenderTarget[0].SrcBlend =                D3D11_BLEND_SRC_ALPHA;
blendStateDescription.RenderTarget[0].DestBlend =               D3D11_BLEND_INV_SRC_ALPHA;
blendStateDescription.RenderTarget[0].SrcBlendAlpha =           D3D11_BLEND_ONE;
blendStateDescription.RenderTarget[0].DestBlendAlpha =          D3D11_BLEND_ZERO;
blendStateDescription.RenderTarget[0].RenderTargetWriteMask  =  D3D11_COLOR_WRITE_ENABLE_ALL;

pixel shader

float4 TexturePixelShader(PixelInputType input) : SV_TARGET {
float4 textureColor;
textureColor = shaderTexture.Sample(SampleType, input.tex);
//discard pink for sprite transparency
if(textureColor.r == 1.0f && textureColor.g == 0.0f && textureColor.b == 1.0f) {
    discard;
}
//set the colour white as the specified pixel colour
if(textureColor.r == 1.0f && textureColor.g == 1.0f && textureColor.b == 1.0f) {
    textureColor = textureColor * pixelColor;
}
return textureColor;
}

Nico Schertler Nico Schertler · Accepted Answer · 2014-06-16T15:39:26

2

votes

Turn off AlphaToCoverage. This should only be used for multi-sampling renderings.

DirectX 11 transparent blending missing every other texel

1 Answers