53 lines
1,019 B
ArmAsm
53 lines
1,019 B
ArmAsm
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/**
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* r3: GXPrimitive
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* r5: n (MUST be 2**n or 2**n+1)
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* rData: {x: u16, y: u16, r: u16, mask: u16, color: u32}
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*
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* rData += .Ngon.size
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*/
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.set rIdx, rFVar0
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.set rShift, rFVar1
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.set fXY, 2
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.set fR, 3
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drawNgon:
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addi rIdx, r5, -1
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mflr rLR
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/**
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* cntlzw(n) = 31-log(n)
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* shift = 16-log(n)-jmaSinShift+2
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* = cntlzw(n)-(31-18+jmaSinShift)
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*/
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cntlzw rShift, r5
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subi rShift, rShift, 31-18+jmaSinShift
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## GXBegin()
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bl .GXBegin
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## load (x, y), (r), (color)
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psq_l fXY, .Ngon.$x(rData), 0, gqr.q
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psq_l fR, .Ngon.$r(rData), 1, gqr.q
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lwz rColor, .Ngon.$color(rData)
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drawNgon.loop:
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rlwnm r0, rIdx, rShift, 32-18+jmaSinShift, 31-2
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lfsx f0, rCosTable, r0
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lfsx f1, rSinTable, r0
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ps_merge00 f0, f0, f1
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## (x, y) = (cos, sin) * r.ps0 + (x0, y0)
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ps_madds0 f0, f0, fR, fXY
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psq_st f0, 0(rGX), 0, gqr.dq
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## z = 0
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sth rZero, 0(rGX)
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## color
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stw rColor, 0(rGX)
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## next
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addic. rIdx, rIdx, -1
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bge+ drawNgon.loop
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drawNgon.done:
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addi rData, rData, .Ngon.size
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b .draw.epilogue
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