Fix buffer overrun in D3D12_Draw_Zoo

util/test/demos/d3d12/d3d12_draw_zoo.cpp

@@ -222,7 +222,7 @@ float4 main(v2f IN) : SV_Target0
     ID3D12ResourcePtr vb =
         MakeBuffer().Data(vbData).Size(UINT((vbData.size() + 100) * sizeof(DefaultA2V)));
 
-    Vec4f instData[16] = {};
+    Vec4f instData[256] = {};
     for(int i = 0; i < ARRAY_COUNT(instData); i++)
       instData[i] = Vec4f(-100.0f, -100.0f, -100.0f, -100.0f);
 
@@ -240,7 +240,7 @@ float4 main(v2f IN) : SV_Target0
     ID3D12ResourcePtr instvb = MakeBuffer().Data(instData).Size(4096);
 
     std::vector<uint16_t> idxData;
-    idxData.resize(100);
+    idxData.resize(2048);
 
     {
       idxData[0] = 0;