Perform image format conversion for VAAPI on the gpu

assets/shaders/directx/ConvertYPS.hlsl

@@ -0,0 +1,25 @@
+Texture2D image : register(t0);
+
+SamplerState def_sampler : register(s0);
+
+cbuffer ColorMatrix : register(b0) {
+	float4 color_vec_y;
+	float4 color_vec_u;
+	float4 color_vec_v;
+	float2 range_y;
+	float2 range_uv;
+};
+
+struct PS_INPUT
+{
+	float4 pos : SV_POSITION;
+	float2 tex : TEXCOORD;
+};
+
+float main_ps(PS_INPUT frag_in) : SV_Target
+{
+	float3 rgb = image.Sample(def_sampler, frag_in.tex, 0).rgb;
+	float y = dot(color_vec_y.xyz, rgb);
+
+	return y * range_y.x + range_y.y;
+}