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==Writing to XF registers==
==Writing to XF registers==
Writing to XF registers is done by writing values to the FIFO, as shown below:
Writing to XF registers is done by writing values to the FIFO, as shown below:
* write the values to write to each register (32-bit each)
* write the values to write to each register (32-bit each)
Where n is the number of registers to write.
Where n is the number of registers to write.
==XF registers==
==XF registers==
===XF viewport registers===
===XF viewport registers===
{{regsimple | GX_XF_VIEWPORT_F | addr=0x101F | bits=32 | access = R/W}}
{{regsimple | GX_XF_VIEWPORT_FP | addr=0x101F | bits=32 | access = R/W}}
* 0x101F: This register defines the far plane of the viewport.
* 0x101F: This register defines the far plane of the viewport.
* GX_XF_VIEWPORT_X1 = (viewport_x + (viewport_width / 2)) + 342
* GX_XF_VIEWPORT_X1 = (viewport_x + (viewport_width / 2)) + 342
* GX_XF_VIEWPORT_Y1 = (viewport_y + (viewport_height / 2)) + 342
* GX_XF_VIEWPORT_Y1 = (viewport_y + (viewport_height / 2)) + 342
* GX_XF_VIEWPORT_F = (viewport_farplane * 16777215)
* GX_XF_VIEWPORT_FP = (viewport_farplane * 16777215)
* GX_XF_VIEWPORT_Z = (viewport_farplane - viewport_nearplane) * 16777215
* GX_XF_VIEWPORT_Z = (viewport_farplane - viewport_nearplane) * 16777215
''Note: These formulas are taken from the libogc fucntion GX_SetViewportJitter().''
''Note: These formulas are taken from the libogc function GX_SetViewportJitter().''
GX_XF_VIEWPORT_FP and GX_XF_VIEWPORT_Z are 24-bit fixed-point values ranging between 0 and 16777215. These values respectively represent 0.0 and 1.0 in floating-point.
All the other viewport registers are 32-bit floating-point values.