[GPU] Shaders to common, xb buildshaders instead of buildhlsl

src/xenia/gpu/shaders/tessellation_adaptive.vs.hlsl

@@ -0,0 +1,17 @@
+#include "endian.hlsli"
+#include "xenos_draw.hlsli"
+
+XeHSControlPointInputAdaptive main(uint xe_edge_factor : SV_VertexID) {
+  XeHSControlPointInputAdaptive output;
+  // The Xbox 360's GPU accepts the float32 tessellation factors for edges
+  // through a special kind of an index buffer.
+  // While Viva Pinata sets the factors to 0 for frustum-culled (quad) patches,
+  // in Halo 3 only allowing patches with factors above 0 makes distant
+  // (triangle) patches disappear - it appears that there are no special values
+  // for culled patches on the Xbox 360 (unlike zero, negative and NaN on
+  // Direct3D 11).
+  output.edge_factor = clamp(
+      asfloat(XeEndianSwap32(xe_edge_factor, xe_vertex_index_endian)) + 1.0f,
+      xe_tessellation_factor_range.x, xe_tessellation_factor_range.y);
+  return output;
+}