[host] added YUV420 output support

host/Shaders/Pixel.hlsl

@@ -0,0 +1,13 @@
+Texture2D    texTexture;
+SamplerState texSampler;
+
+struct VS
+{
+  float4 pos : SV_Position;
+  float2 tex : TEXCOORD;
+};
+
+float4 main(VS input): SV_Target
+{
+  return texTexture.Sample(texSampler, input.tex);
+}