Made D3D11 implementation work when using NK_UINT_DRAW_INDEX

Author: Hecklezz

demo/d3d11/nuklear_d3d11.h

@@ -85,10 +85,15 @@ nk_d3d11_render(ID3D11DeviceContext *context, enum nk_anti_aliasing AA)
  const float blend_factor[4] = { 0.0f, 0.0f, 0.0f, 0.0f };
  const UINT stride = sizeof(struct nk_d3d11_vertex);
  const UINT offset = 0;
+#ifdef NK_UINT_DRAW_INDEX
+ DXGI_FORMAT index_buffer_format = DXGI_FORMAT_R32_UINT;
+#else
+ DXGI_FORMAT index_buffer_format = DXGI_FORMAT_R16_UINT;
+#endif
 
  ID3D11DeviceContext_IASetInputLayout(context, d3d11.input_layout);
  ID3D11DeviceContext_IASetVertexBuffers(context, 0, 1, &d3d11.vertex_buffer, &stride, &offset);
- ID3D11DeviceContext_IASetIndexBuffer(context, d3d11.index_buffer, DXGI_FORMAT_R16_UINT, 0);
+ ID3D11DeviceContext_IASetIndexBuffer(context, d3d11.index_buffer, index_buffer_format, 0);
  ID3D11DeviceContext_IASetPrimitiveTopology(context, D3D11_PRIMITIVE_TOPOLOGY_TRIANGLELIST);
 
  ID3D11DeviceContext_VSSetShader(context, d3d11.vertex_shader, NULL, 0);