Implement YUV 4:4:4 decoding with D3D11VA on Intel GPUs

app/shaders/d3d11_yuv444_pixel_end.hlsli

@@ -0,0 +1,13 @@
+min16float4 main(ShaderInput input) : SV_TARGET
+{
+    // Clamp the texcoords to avoid sampling the row of texels adjacent to the alignment padding
+    min16float3 yuv = swizzle(videoTex.Sample(theSampler, min(input.tex, chromaTexMax.rg)));
+
+    // Subtract the YUV offset for limited vs full range
+    yuv -= offsets;
+
+    // Multiply by the conversion matrix for this colorspace
+    yuv = mul(yuv, cscMatrix);
+
+    return min16float4(yuv, 1.0);
+}