PIX (originally short for Performance Investigator for Xbox) is a performance analysis tool from Microsoft that can help software developers maximize the efficiency of Direct3D applications. Originally for the Xbox video game console, Microsoft has released it for the Windows platform as part of the Microsoft DirectX SDK to aid game developers.
PIX can take a snapshot of an application running, store the calls to Direct3D and data used in that single frame, and recreate the frame step-by-step, allowing the programmer to see the intermediate contents of various buffers and devices, debug individual vertices and pixels, or see which call took the most processing time.
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