HLSL: Add tx.GetDimensions method (uint returns only)

Test/hlsl.getdimensions.dx10.vert

@@ -0,0 +1,27 @@
+SamplerState       g_sSamp : register(s0);
+
+uniform Texture1D <float4> g_tTex1df4 : register(t0);
+
+struct VS_OUTPUT
+{
+    float4 Pos : SV_Position;
+};
+
+VS_OUTPUT main()
+{
+   VS_OUTPUT vsout;
+
+   uint WidthU;
+   uint NumberOfLevelsU;
+
+   // Most of the tests are in the hlsl.getdimensions.dx10.frag on the fragment side.
+   // This is just to establish that GetDimensions appears in the vertex stage.
+
+   // 1D, float tx, uint params
+   g_tTex1df4 . GetDimensions(WidthU);
+   g_tTex1df4 . GetDimensions(6, WidthU, NumberOfLevelsU);
+
+   vsout.Pos = float4(0,0,0,0);
+
+   return vsout;
+}