Inter can be PS2_GS_NOINTERLACE or PS2_GS_INTERLACE. In our program, we use a 0 to reset the parameters. If Mode is 1 (meaning you just want to cancel drawing, not reset the parameters) none of the following arguments do anything. A 1 cancels drawing and destroys primitive data in the GS's buffer. 0 resets everything, including the parameters in the ps2_gs_gparam structure. Ps2_gs_reset(int mode, int inter, int omode, int ffmode, int resolution, int refresh_rate) mode can be 0 or 1. Finally, two functions are declared to acquire and release the GS. The structure ps2_gs_dbuff is used for double buffering, and the ps2_gs_finish structure contains the data used to make the GS wait until all commands are completed and all pixels are rasterized. Things like the resolution, video mode, width and height of drawing area, pixel ration, and other general parameters are stored in the ps2_gs_gparam structure.

Next a pointer to a ps2_gs_gparam structure is declared. For the curious, it is named g_fd_gs because in the future it is used as a file descriptor. For this program we will only be using it to verify that the GS is open and ready for us to program. First off, you must include the ps2gs header file in order to program the GS. #include //header file containing GS commands int g_fd_gs //used to check if GS is opened ps2_gs_gparam *g_gp //structure that keeps GS parameters ps2_gs_dbuff g_db //structure for double buffering ps2_gs_finish g_finish //structure to wait until drawing is done int acquire() //functions used to acquire and release int release() //the GS.

Cogswap ps2 tutorial