好的，所以我一直试图让 Alpha Blending 在我的 3D 应用程序中工作，但它只是不想发生。我在渲染循环的最后绘制带有正交投影的 2d 图像（深度测试保持启用），图像纹理具有透明部分，但它们呈现黑色。这是我的混合代码：
D3D11_BLEND_DESC blendStateDesc;
ZeroMemory(&blendStateDesc, sizeof(D3D11_BLEND_DESC));
blendStateDesc.AlphaToCoverageEnable = FALSE;
blendStateDesc.IndependentBlendEnable = FALSE;
blendStateDesc.RenderTarget[0].BlendEnable = TRUE;
blendStateDesc.RenderTarget[0].SrcBlend = D3D11_BLEND_SRC_ALPHA;
blendStateDesc.RenderTarget[0].DestBlend = D3D11_BLEND_INV_SRC_ALPHA;
blendStateDesc.RenderTarget[0].BlendOp = D3D11_BLEND_OP_ADD;
blendStateDesc.RenderTarget[0].SrcBlendAlpha = D3D11_BLEND_SRC_ALPHA;
blendStateDesc.RenderTarget[0].DestBlendAlpha = D3D11_BLEND_DEST_ALPHA;
blendStateDesc.RenderTarget[0].BlendOpAlpha = D3D11_BLEND_OP_ADD;
blendStateDesc.RenderTarget[0].RenderTargetWriteMask = D3D11_COLOR_WRITE_ENABLE_ALL;
if (FAILED(device->CreateBlendState(&blendStateDesc, &blendState))) {
printf("Failed To Create Blend State\n");
}
deviceContext->OMSetBlendState(blendState, NULL, 0xFFFFFF);
如果它有帮助，这里是纹理描述：
D3D11_TEXTURE2D_DESC texDesc;
texDesc.Width = TextureWidth;
texDesc.Height = textureHeight;
texDesc.MipLevels = 1;
texDesc.ArraySize = 1;
texDesc.Format = DXGI_FORMAT_B8G8R8A8_UNORM;
texDesc.SampleDesc.Count = 1;
texDesc.SampleDesc.Quality = 0;
texDesc.Usage = D3D11_USAGE_IMMUTABLE;
texDesc.BindFlags = D3D11_BIND_SHADER_RESOURCE;
texDesc.CPUAccessFlags = 0;
texDesc.MiscFlags = 0;
我只使用一个渲染目标，而不是在着色器中预乘 alpha。我到处寻找并尝试了 D3D11_BLEND_STATE 的各种不同组合，但没有任何效果。我能得到的最接近的是当我将 AlphaToCoverage 设置为 TRUE 但如果我更改顶点的 alpha 它将不起作用，而且我知道我在做什么 AlphaToCoverage 应该是 FALSE。