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DSP1/Rotate
From SnesLab
| 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