DrawGetTextureId
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int DrawGetTextureId( char const *filename )
Use this function before CreateNewTextureID to make sure you don't reference the same material with multiple texture IDs.
Sample
currentId = surface()->DrawGetTextureId( texturename );
if ( currentId == -1 )
{
currentId = surface()->CreateNewTextureID();
}
surface()->DrawSetTextureFile( currentId, texturename, false, true );