[Q] Double Shock Controller? (OTG)

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http://forum.xda-developers.com – I have a double shock controller that I used for my laptop. Yesterday I bought an OTG and I tried to connect it with my S3. I ran a test on Dead Trigger, I found that only the axis controller (the up down left right control) works, others like the L1 R1 and the 4 action buttons (triangle, round...) doesn't work. So, I can only move around. Can someone tell me what actually happen, I saw on a video before that all the buttons should work, but why not with my double shock controller? Thank you! (HowTos)