WIP: D3D11VA support

Overlays work, but drawing the actual video is unimplemented

app/shaders/build_hlsl.bat

@@ -0,0 +1,3 @@
+fxc /T vs_4_0_level_9_3 /Fo d3d11_vertex.fxc d3d11_vertex.hlsl
+
+fxc /T ps_4_0_level_9_3 /Fo d3d11_overlay_pixel.fxc d3d11_overlay_pixel.hlsl

app/shaders/d3d11_overlay_pixel.hlsl

@@ -0,0 +1,13 @@
+Texture2D theTexture : register(t0);
+SamplerState theSampler : register(s0);
+
+struct ShaderInput
+{
+    float4 pos : SV_POSITION;
+    float2 tex : TEXCOORD0;
+};
+
+float4 main(ShaderInput input) : SV_TARGET
+{
+    return theTexture.Sample(theSampler, input.tex);
+}

app/shaders/d3d11_vertex.hlsl

@@ -0,0 +1,19 @@
+struct ShaderInput
+{
+    float2 pos : POSITION;
+    float2 tex : TEXCOORD0;
+};
+
+struct ShaderOutput
+{
+    float4 pos : SV_POSITION;
+    float2 tex : TEXCOORD0;
+};
+
+ShaderOutput main(ShaderInput input) 
+{
+    ShaderOutput output;
+    output.pos = float4(input.pos, 0.0f, 1.0f);
+    output.tex = input.tex;
+    return output;
+}