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<a href='https://github.com/akkartik/mu/blob/main/507line.mu'>https://github.com/akkartik/mu/blob/main/507line.mu</a>
<pre id='vimCodeElement'>
<span id="L1" class="LineNr"> 1 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='507line.mu.html#L1'>draw-line</a></span> <a href='500fake-screen.mu.html#L14'>screen</a>: (addr <a href='500fake-screen.mu.html#L14'>screen</a>), x0: int, y0: int, x1: int, y1: int, color: int <span class="Delimiter">{</span>
<span id="L2" class="LineNr"> 2 </span> <span class="PreProc">var</span> dx: int
<span id="L3" class="LineNr"> 3 </span> <span class="PreProc">var</span> dy: int
<span id="L4" class="LineNr"> 4 </span> <span class="PreProc">var</span> sx: int
<span id="L5" class="LineNr"> 5 </span> <span class="PreProc">var</span> sy: int
<span id="L6" class="LineNr"> 6 </span> <span class="PreProc">var</span> err: int
<span id="L7" class="LineNr"> 7 </span> <span class="muComment"># dx = abs(x1-x0)</span>
<span id="L8" class="LineNr"> 8 </span> <span class="PreProc">var</span> tmp2/<span class="Constant">ecx</span>: int <span class="Special"><-</span> copy x1
<span id="L9" class="LineNr"> 9 </span> tmp2 <span class="Special"><-</span> subtract x0
<span id="L10" class="LineNr"> 10 </span> <span class="PreProc">var</span> tmp/<span class="Constant">eax</span>: int <span class="Special"><-</span> <a href='506math.mu.html#L1'>abs</a> tmp2
<span id="L11" class="LineNr"> 11 </span> copy-to dx, tmp
<span id="L12" class="LineNr"> 12 </span> <span class="muComment"># sx = sgn(x1-x0)</span>
<span id="L13" class="LineNr"> 13 </span> tmp <span class="Special"><-</span> <a href='506math.mu.html#L10'>sgn</a> tmp2
<span id="L14" class="LineNr"> 14 </span> copy-to sx, tmp
<span id="L15" class="LineNr"> 15 </span> <span class="muComment"># dy = -abs(y1-y0)</span>
<span id="L16" class="LineNr"> 16 </span> tmp2 <span class="Special"><-</span> copy y1
<span id="L17" class="LineNr"> 17 </span> tmp2 <span class="Special"><-</span> subtract y0
<span id="L18" class="LineNr"> 18 </span> tmp <span class="Special"><-</span> <a href='506math.mu.html#L1'>abs</a> tmp2
<span id="L19" class="LineNr"> 19 </span> tmp <span class="Special"><-</span> negate
<span id="L20" class="LineNr"> 20 </span> copy-to dy, tmp
<span id="L21" class="LineNr"> 21 </span> <span class="muComment"># sy = sgn(y1-y0)</span>
<span id="L22" class="LineNr"> 22 </span> tmp <span class="Special"><-</span> <a href='506math.mu.html#L10'>sgn</a> tmp2
<span id="L23" class="LineNr"> 23 </span> copy-to sy, tmp
<span id="L24" class="LineNr"> 24 </span> <span class="muComment"># err = dx + dy</span>
<span id="L25" class="LineNr"> 25 </span> tmp <span class="Special"><-</span> copy dy
<span id="L26" class="LineNr"> 26 </span> tmp <span class="Special"><-</span> add dx
<span id="L27" class="LineNr"> 27 </span> copy-to err, tmp
<span id="L28" class="LineNr"> 28 </span> <span class="muComment">#</span>
<span id="L29" class="LineNr"> 29 </span> <span class="PreProc">var</span> x/<span class="Constant">ecx</span>: int <span class="Special"><-</span> copy x0
<span id="L30" class="LineNr"> 30 </span> <span class="PreProc">var</span> y/<span class="Constant">edx</span>: int <span class="Special"><-</span> copy y0
<span id="L31" class="LineNr"> 31 </span> $draw-line:<span class="PreProc">loop</span>: <span class="Delimiter">{</span>
<span id="L32" class="LineNr"> 32 </span> <a href='500fake-screen.mu.html#L463'>pixel</a> <a href='500fake-screen.mu.html#L14'>screen</a>, x, y, color
<span id="L33" class="LineNr"> 33 </span> <span class="muComment"># if (x == x1 && y == y1) break</span>
<span id="L34" class="LineNr"> 34 </span> <span class="Delimiter">{</span>
<span id="L35" class="LineNr"> 35 </span> compare x, x1
<span id="L36" class="LineNr"> 36 </span> <span class="PreProc">break-if-!=</span>
<span id="L37" class="LineNr"> 37 </span> compare y, y1
<span id="L38" class="LineNr"> 38 </span> <span class="PreProc">break-if-!=</span>
<span id="L39" class="LineNr"> 39 </span> <span class="PreProc">break</span> $draw-line:<span class="PreProc">loop</span>
<span id="L40" class="LineNr"> 40 </span> <span class="Delimiter">}</span>
<span id="L41" class="LineNr"> 41 </span> <span class="muComment"># e2 = err*2</span>
<span id="L42" class="LineNr"> 42 </span> <span class="PreProc">var</span> e2/<span class="Constant">ebx</span>: int <span class="Special"><-</span> copy err
<span id="L43" class="LineNr"> 43 </span> e2 <span class="Special"><-</span> shift-left <span class="Constant">1</span>
<span id="L44" class="LineNr"> 44 </span> <span class="muComment"># if (e2 >= dy) { err += dy; x += sx; }</span>
<span id="L45" class="LineNr"> 45 </span> <span class="Delimiter">{</span>
<span id="L46" class="LineNr"> 46 </span> compare e2, dy
<span id="L47" class="LineNr"> 47 </span> <span class="PreProc">break-if-<</span>
<span id="L48" class="LineNr"> 48 </span> tmp <span class="Special"><-</span> copy dy
<span id="L49" class="LineNr"> 49 </span> add-to err, tmp
<span id="L50" class="LineNr"> 50 </span> x <span class="Special"><-</span> add sx
<span id="L51" class="LineNr"> 51 </span> <span class="Delimiter">}</span>
<span id="L52" class="LineNr"> 52 </span> <span class="muComment"># if (e2 <= dx) { err += dx; y += sy; }</span>
<span id="L53" class="LineNr"> 53 </span> <span class="Delimiter">{</span>
<span id="L54" class="LineNr"> 54 </span> compare e2, dx
<span id="L55" class="LineNr"> 55 </span> <span class="PreProc">break-if-></span>
<span id="L56" class="LineNr"> 56 </span> tmp <span class="Special"><-</span> copy dx
<span id="L57" class="LineNr"> 57 </span> add-to err, tmp
<span id="L58" class="LineNr"> 58 </span> y <span class="Special"><-</span> add sy
<span id="L59" class="LineNr"> 59 </span> <span class="Delimiter">}</span>
<span id="L60" class="LineNr"> 60 </span> <span class="PreProc">loop</span>
<span id="L61" class="LineNr"> 61 </span> <span class="Delimiter">}</span>
<span id="L62" class="LineNr"> 62 </span><span class="Delimiter">}</span>
<span id="L63" class="LineNr"> 63 </span>
<span id="L64" class="LineNr"> 64 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='507line.mu.html#L64'>draw-horizontal-line</a></span> <a href='500fake-screen.mu.html#L14'>screen</a>: (addr <a href='500fake-screen.mu.html#L14'>screen</a>), y: int, x0: int, x1: int, color: int <span class="Delimiter">{</span>
<span id="L65" class="LineNr"> 65 </span> <span class="PreProc">var</span> x/<span class="Constant">eax</span>: int <span class="Special"><-</span> copy x0
<span id="L66" class="LineNr"> 66 </span> <span class="Delimiter">{</span>
<span id="L67" class="LineNr"> 67 </span> compare x, x1
<span id="L68" class="LineNr"> 68 </span> <span class="PreProc">break-if->=</span>
<span id="L69" class="LineNr"> 69 </span> <a href='500fake-screen.mu.html#L463'>pixel</a> <a href='500fake-screen.mu.html#L14'>screen</a>, x, y, color
<span id="L70" class="LineNr"> 70 </span> x <span class="Special"><-</span> increment
<span id="L71" class="LineNr"> 71 </span> <span class="PreProc">loop</span>
<span id="L72" class="LineNr"> 72 </span> <span class="Delimiter">}</span>
<span id="L73" class="LineNr"> 73 </span><span class="Delimiter">}</span>
<span id="L74" class="LineNr"> 74 </span>
<span id="L75" class="LineNr"> 75 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='507line.mu.html#L75'>draw-vertical-line</a></span> <a href='500fake-screen.mu.html#L14'>screen</a>: (addr <a href='500fake-screen.mu.html#L14'>screen</a>), x: int, y0: int, y1: int, color: int <span class="Delimiter">{</span>
<span id="L76" class="LineNr"> 76 </span> <span class="PreProc">var</span> y/<span class="Constant">eax</span>: int <span class="Special"><-</span> copy y0
<span id="L77" class="LineNr"> 77 </span> <span class="Delimiter">{</span>
<span id="L78" class="LineNr"> 78 </span> compare y, y1
<span id="L79" class="LineNr"> 79 </span> <span class="PreProc">break-if->=</span>
<span id="L80" class="LineNr"> 80 </span> <a href='500fake-screen.mu.html#L463'>pixel</a> <a href='500fake-screen.mu.html#L14'>screen</a>, x, y, color
<span id="L81" class="LineNr"> 81 </span> y <span class="Special"><-</span> increment
<span id="L82" class="LineNr"> 82 </span> <span class="PreProc">loop</span>
<span id="L83" class="LineNr"> 83 </span> <span class="Delimiter">}</span>
<span id="L84" class="LineNr"> 84 </span><span class="Delimiter">}</span>
<span id="L85" class="LineNr"> 85 </span>
<span id="L86" class="LineNr"> 86 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='507line.mu.html#L86'>draw-rect</a></span> <a href='500fake-screen.mu.html#L14'>screen</a>: (addr <a href='500fake-screen.mu.html#L14'>screen</a>), xmin: int, ymin: int, xmax: int, ymax: int, color: int <span class="Delimiter">{</span>
<span id="L87" class="LineNr"> 87 </span> <span class="PreProc">var</span> y/<span class="Constant">eax</span>: int <span class="Special"><-</span> copy ymin
<span id="L88" class="LineNr"> 88 </span> <span class="Delimiter">{</span>
<span id="L89" class="LineNr"> 89 </span> compare y, ymax
<span id="L90" class="LineNr"> 90 </span> <span class="PreProc">break-if->=</span>
<span id="L91" class="LineNr"> 91 </span> <a href='507line.mu.html#L64'>draw-horizontal-line</a> <a href='500fake-screen.mu.html#L14'>screen</a>, y, xmin, xmax, color
<span id="L92" class="LineNr"> 92 </span> y <span class="Special"><-</span> increment
<span id="L93" class="LineNr"> 93 </span> <span class="PreProc">loop</span>
<span id="L94" class="LineNr"> 94 </span> <span class="Delimiter">}</span>
<span id="L95" class="LineNr"> 95 </span><span class="Delimiter">}</span>
<span id="L96" class="LineNr"> 96 </span>
<span id="L97" class="LineNr"> 97 </span><span class="muComment"># 0 <= u <= 1</span>
<span id="L98" class="LineNr"> 98 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='507line.mu.html#L98'>line-point</a></span> u: float, x0: int, x1: int<span class="PreProc"> -> </span>_/<span class="Constant">eax</span>: int <span class="Delimiter">{</span>
<span id="L99" class="LineNr"> 99 </span> <span class="PreProc">var</span> one/<span class="Constant">eax</span>: int <span class="Special"><-</span> copy <span class="Constant">1</span>
<span id="L100" class="LineNr">100 </span> <span class="PreProc">var</span> u-prime/<span class="Constant">xmm0</span>: float <span class="Special"><-</span> convert one
<span id="L101" class="LineNr">101 </span> u-prime <span class="Special"><-</span> subtract u
<span id="L102" class="LineNr">102 </span> <span class="PreProc">var</span> result/<span class="Constant">xmm1</span>: float <span class="Special"><-</span> convert x0
<span id="L103" class="LineNr">103 </span> result <span class="Special"><-</span> multiply u-prime
<span id="L104" class="LineNr">104 </span> <span class="PreProc">var</span> term2/<span class="Constant">xmm2</span>: float <span class="Special"><-</span> convert x1
<span id="L105" class="LineNr">105 </span> term2 <span class="Special"><-</span> multiply u
<span id="L106" class="LineNr">106 </span> result <span class="Special"><-</span> add term2
<span id="L107" class="LineNr">107 </span> <span class="PreProc">var</span> result/<span class="Constant">eax</span>: int <span class="Special"><-</span> convert result
<span id="L108" class="LineNr">108 </span> <span class="PreProc">return</span> result
<span id="L109" class="LineNr">109 </span><span class="Delimiter">}</span>
</pre>
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