Reorganize assets

assets/assets_windows/shaders/directx/ScenePS.hlsl

@@ -0,0 +1,14 @@
+Texture2D image : register(t0);
+
+SamplerState def_sampler : register(s0);
+
+struct PS_INPUT
+{
+	float4 pos : SV_POSITION;
+	float2 tex : TEXCOORD;
+};
+
+float4 main_ps(PS_INPUT frag_in) : SV_Target
+{
+	return image.Sample(def_sampler, frag_in.tex, 0);
+}