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DSP1/Rotate: Difference between revisions
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!colspan="8"|Basic Info | !colspan="8"|Basic Info | ||
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|'''Opcode''' | |'''Opcode''' | ||
|0C | |0C | ||
|+ | |||
|'''Speed''' | |||
|64 cycles | |||
8.6 μs | |||
|} | |} | ||
'''Rotate''' is a [[DSP1]] command that rotates a two-dimensional point counterclockwise about the origin. Page 3-2-1 of the manual states that Rotate takes 65 cycles, which is one more than the sum on page 3-5-8. | |||
=== Input Parameters === | |||
* '''θ''' is the angle of rotation about the Z axis | |||
* '''x1''' is the x coordinate before rotation | |||
* '''y1''' is the x coordinate before rotation | |||
=== Output Parameters === | |||
* '''x2''' is the x coordinate after rotation | |||
* '''y2''' is the y coordinate after rotation | |||
=== See Also === | |||
* [[Polar]] | |||
=== References === | === References === | ||
* [https://archive.org/details/SNESDevManual/book2/page/n298 Page 3-5-8 of Book II] of the official Super Nintendo development manual | * subparagraph 5.3.1 on [https://archive.org/details/SNESDevManual/book2/page/n298 Page 3-5-8 of Book II] of the official Super Nintendo development manual | ||
* paragraph 6.8 on [https://archive.org/details/SNESDevManual/book2/page/n324 page 3-6-1 of Book II], lbid. | |||
* https://github.com/bsnes-emu/bsnes/blob/master/bsnes/sfc/coprocessor/dsp1/dsp1emu.cpp#L436 | |||
[[Category:DSP1]] | |||
[[Category:Coordinate Calculation Commands]] | |||
Latest revision as of 05:08, 10 January 2024
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Opcode | 0C | ||||||
| Speed | 64 cycles
8.6 μs | ||||||
Rotate is a DSP1 command that rotates a two-dimensional point counterclockwise about the origin. Page 3-2-1 of the manual states that Rotate takes 65 cycles, which is one more than the sum on page 3-5-8.
Input Parameters
- θ is the angle of rotation about the Z axis
- x1 is the x coordinate before rotation
- y1 is the x coordinate before rotation
Output Parameters
- x2 is the x coordinate after rotation
- y2 is the y coordinate after rotation
See Also
References
- subparagraph 5.3.1 on Page 3-5-8 of Book II of the official Super Nintendo development manual
- paragraph 6.8 on page 3-6-1 of Book II, lbid.
- https://github.com/bsnes-emu/bsnes/blob/master/bsnes/sfc/coprocessor/dsp1/dsp1emu.cpp#L436