Integrated RmlUi, fully moved over to cmake

shaders/InterfaceVS.hlsl

@@ -1,10 +1,23 @@
+struct Input {
+    float4x4 transform;
+    float2 translation;
+};
+
+[[vk::push_constant]]
+ConstantBuffer<Input> gInput : register(b0, space0);
+
 void VSMain(
-    in uint vert_id : SV_VertexID,
-    out float4 pos : SV_Position
+    in float2 iPosition : POSITION,
+    in float4 iColor : COLOR,
+    in float2 iUV : TEXCOORD,
+    out float4 oColor : COLOR,
+    out float2 oUV : TEXCOORD,
+    out float4 oPosition : SV_Position
 )
 {
-    const float2 translation = 0.1f;
-    const float2 size = 0.1f;
-    float2 extent = float2(vert_id & 1 ? 1.0f : 0.0f, vert_id & 2 ? 1.0f : 0.0f);
-    pos = float4(extent * size + translation, 1.0f, 1.0f);
+	float2 translatedPos = iPosition + gInput.translation;
+	oPosition = mul(gInput.transform, float4(translatedPos, 0, 1));
+
+	oColor = iColor;
+	oUV = iUV;
 }