Direct3D applications often rely on depth buffers to properly display objects in a scene. For a conceptual overview, see Depth Buffers. To use depth buffering, you must enumerate supported depth-buffer formats, create a depth-buffer surface, attach it to a render-target surface, and enable depth buffering for the rendering device.
This tutorial parallels the code in the Triangle sample project which uses the most commonly supported type of depth buffer, a z-buffer. The ZBuffer sample performs the following steps to use a z-buffer:
Note The code in the ZBuffer sample is nearly identical to the code in Triangle. This tutorial focuses only on the depth-buffer code unique to ZBuffer, and does not cover setting up Direct3D, rendering, shutting down, or handling Windows messages. For information on these tasks, see Tutorial 1: Rendering a Single Triangle.
Because some rendering devices require depth buffers to be located in particular places in memory, the system requires that you create and attach the depth-buffer surface to the render-target surface before you create a rendering device.