Perform image format conversion for VAAPI on the gpu

assets/shaders/directx/ConvertUVVS.hlsl

@@ -0,0 +1,29 @@
+struct VertTexPosWide {
+	float3 uuv : TEXCOORD;
+	float4 pos : SV_POSITION;
+};
+
+cbuffer info : register(b0) {
+	float width_i;
+};
+
+//--------------------------------------------------------------------------------------
+// Vertex Shader
+//--------------------------------------------------------------------------------------
+VertTexPosWide main_vs(uint vI : SV_VERTEXID)
+{
+	float idHigh = float(vI >> 1);
+	float idLow = float(vI & uint(1));
+
+	float x = idHigh * 4.0 - 1.0;
+	float y = idLow * 4.0 - 1.0;
+
+	float u_right = idHigh * 2.0;
+	float u_left = u_right - width_i;
+	float v = 1.0 - idLow * 2.0;
+
+	VertTexPosWide vert_out;
+	vert_out.uuv = float3(u_left, u_right, v);
+	vert_out.pos = float4(x, y, 0.0, 1.0);
+	return vert_out;
+}