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<a href='https://github.com/akkartik/mu/blob/main/apps/raytracing/2.mu'>https://github.com/akkartik/mu/blob/main/apps/raytracing/2.mu</a>
<pre id='vimCodeElement'>
<span id="L1" class="LineNr"> 1 </span><span class="muComment"># Listing 7 of <a href="https://raytracing.github.io/books/RayTracingInOneWeekend.html">https://raytracing.github.io/books/RayTracingInOneWeekend.html</a></span>
<span id="L2" class="LineNr"> 2 </span><span class="muComment">#</span>
<span id="L3" class="LineNr"> 3 </span><span class="muComment"># To run (on Linux):</span>
<span id="L4" class="LineNr"> 4 </span><span class="muComment"># $ git clone <a href="https://github.com/akkartik/mu">https://github.com/akkartik/mu</a></span>
<span id="L5" class="LineNr"> 5 </span><span class="muComment"># $ cd mu</span>
<span id="L6" class="LineNr"> 6 </span><span class="muComment"># $ ./translate_mu apps/raytracing/2.mu</span>
<span id="L7" class="LineNr"> 7 </span><span class="muComment"># $ ./a.elf > 2.ppm</span>
<span id="L8" class="LineNr"> 8 </span>
<span id="L9" class="LineNr"> 9 </span><span class="PreProc">fn</span> <span class="muFunction">main</span><span class="PreProc"> -> </span>_/<span class="Constant">ebx</span>: int <span class="Delimiter">{</span>
<span id="L10" class="LineNr">10 </span> <a href='../../405screen.mu.html#L169'>print-string</a> <span class="Constant">0</span>, <span class="Constant">"P3\n256 256\n255\n"</span>
<span id="L11" class="LineNr">11 </span> <span class="PreProc">var</span> _four/<span class="Constant">edx</span>: int <span class="SpecialChar"><-</span> copy <span class="Constant">4</span>
<span id="L12" class="LineNr">12 </span> <span class="PreProc">var</span> four/<span class="Constant">xmm1</span>: float <span class="SpecialChar"><-</span> convert _four
<span id="L13" class="LineNr">13 </span> <span class="PreProc">var</span> one-fourth/<span class="Constant">xmm1</span>: float <span class="SpecialChar"><-</span> reciprocal four
<span id="L14" class="LineNr">14 </span> <span class="PreProc">var</span> max/<span class="Constant">edx</span>: int <span class="SpecialChar"><-</span> copy <span class="Constant">0xff</span>
<span id="L15" class="LineNr">15 </span> <span class="PreProc">var</span> image-size/<span class="Constant">xmm2</span>: float <span class="SpecialChar"><-</span> convert max
<span id="L16" class="LineNr">16 </span> <span class="PreProc">var</span> j/<span class="Constant">ecx</span>: int <span class="SpecialChar"><-</span> copy <span class="Constant">0xff</span>
<span id="L17" class="LineNr">17 </span> <span class="Delimiter">{</span>
<span id="L18" class="LineNr">18 </span> compare j, <span class="Constant">0</span>
<span id="L19" class="LineNr">19 </span> <span class="PreProc">break-if-<</span>
<span id="L20" class="LineNr">20 </span> <span class="PreProc">var</span> i/<span class="Constant">eax</span>: int <span class="SpecialChar"><-</span> copy <span class="Constant">0</span>
<span id="L21" class="LineNr">21 </span> <span class="Delimiter">{</span>
<span id="L22" class="LineNr">22 </span> compare i, <span class="Constant">0xff</span>
<span id="L23" class="LineNr">23 </span> <span class="PreProc">break-if-></span>
<span id="L24" class="LineNr">24 </span> <span class="PreProc">var</span> c: rgb
<span id="L25" class="LineNr">25 </span> <span class="muComment"># compute r</span>
<span id="L26" class="LineNr">26 </span> <span class="PreProc">var</span> tmp/<span class="Constant">xmm0</span>: float <span class="SpecialChar"><-</span> convert i
<span id="L27" class="LineNr">27 </span> tmp <span class="SpecialChar"><-</span> divide image-size
<span id="L28" class="LineNr">28 </span> <span class="PreProc">var</span> r-addr/<span class="Constant">edx</span>: (addr float) <span class="SpecialChar"><-</span> <a href='../../131table.subx.html#L26'>get</a> c, r
<span id="L29" class="LineNr">29 </span> copy-to *r-addr, tmp
<span id="L30" class="LineNr">30 </span><span class="CommentedCode">#? var tmp2/ebx: int <- reinterpret *r-addr</span>
<span id="L31" class="LineNr">31 </span><span class="CommentedCode">#? print-int32-hex 0, tmp2</span>
<span id="L32" class="LineNr">32 </span><span class="CommentedCode">#? print-string 0, "\n"</span>
<span id="L33" class="LineNr">33 </span> <span class="muComment"># compute g</span>
<span id="L34" class="LineNr">34 </span> tmp <span class="SpecialChar"><-</span> convert j
<span id="L35" class="LineNr">35 </span> tmp <span class="SpecialChar"><-</span> divide image-size
<span id="L36" class="LineNr">36 </span> <span class="PreProc">var</span> g-addr/<span class="Constant">edx</span>: (addr float) <span class="SpecialChar"><-</span> <a href='../../131table.subx.html#L26'>get</a> c, g
<span id="L37" class="LineNr">37 </span> copy-to *g-addr, tmp
<span id="L38" class="LineNr">38 </span> <span class="muComment"># compute b</span>
<span id="L39" class="LineNr">39 </span> <span class="PreProc">var</span> b-addr/<span class="Constant">edx</span>: (addr float) <span class="SpecialChar"><-</span> <a href='../../131table.subx.html#L26'>get</a> c, b
<span id="L40" class="LineNr">40 </span> copy-to *b-addr, one-fourth
<span id="L41" class="LineNr">41 </span> <span class="muComment"># emit</span>
<span id="L42" class="LineNr">42 </span> <span class="PreProc">var</span> c-addr/<span class="Constant">edx</span>: (addr rgb) <span class="SpecialChar"><-</span> address c
<span id="L43" class="LineNr">43 </span> print-rgb <span class="Constant">0</span>, c-addr
<span id="L44" class="LineNr">44 </span> i <span class="SpecialChar"><-</span> increment
<span id="L45" class="LineNr">45 </span> <span class="PreProc">loop</span>
<span id="L46" class="LineNr">46 </span> <span class="Delimiter">}</span>
<span id="L47" class="LineNr">47 </span> j <span class="SpecialChar"><-</span> decrement
<span id="L48" class="LineNr">48 </span> <span class="PreProc">loop</span>
<span id="L49" class="LineNr">49 </span> <span class="Delimiter">}</span>
<span id="L50" class="LineNr">50 </span> <span class="PreProc">return</span> <span class="Constant">0</span>
<span id="L51" class="LineNr">51 </span><span class="Delimiter">}</span>
<span id="L52" class="LineNr">52 </span>
<span id="L53" class="LineNr">53 </span><span class="PreProc">type</span> rgb <span class="Delimiter">{</span>
<span id="L54" class="LineNr">54 </span> <span class="muComment"># components normalized to within [0.0, 1.0]</span>
<span id="L55" class="LineNr">55 </span> r: float
<span id="L56" class="LineNr">56 </span> g: float
<span id="L57" class="LineNr">57 </span> b: float
<span id="L58" class="LineNr">58 </span><span class="Delimiter">}</span>
<span id="L59" class="LineNr">59 </span>
<span id="L60" class="LineNr">60 </span><span class="muComment"># print translating to [0, 256)</span>
<span id="L61" class="LineNr">61 </span><span class="PreProc">fn</span> <span class="muFunction">print-rgb</span> <a href='../../405screen.mu.html#L9'>screen</a>: (addr <a href='../../405screen.mu.html#L9'>screen</a>), _c: (addr rgb) <span class="Delimiter">{</span>
<span id="L62" class="LineNr">62 </span> <span class="PreProc">var</span> c/<span class="Constant">esi</span>: (addr rgb) <span class="SpecialChar"><-</span> copy _c
<span id="L63" class="LineNr">63 </span> <span class="PreProc">var</span> n/<span class="Constant">ecx</span>: int <span class="SpecialChar"><-</span> copy <span class="Constant">0xff</span> <span class="muComment"># turns out 255 works just as well as 255.999, which is lucky because we don't have floating-point literals</span>
<span id="L64" class="LineNr">64 </span> <span class="PreProc">var</span> xn/<span class="Constant">xmm1</span>: float <span class="SpecialChar"><-</span> convert n
<span id="L65" class="LineNr">65 </span> <span class="muComment"># print 255 * c->r</span>
<span id="L66" class="LineNr">66 </span> <span class="PreProc">var</span> result/<span class="Constant">xmm0</span>: float <span class="SpecialChar"><-</span> copy xn
<span id="L67" class="LineNr">67 </span> <span class="PreProc">var</span> src-addr/<span class="Constant">eax</span>: (addr float) <span class="SpecialChar"><-</span> <a href='../../131table.subx.html#L26'>get</a> c, r
<span id="L68" class="LineNr">68 </span> result <span class="SpecialChar"><-</span> multiply *src-addr
<span id="L69" class="LineNr">69 </span> <span class="PreProc">var</span> result-int/<span class="Constant">edx</span>: int <span class="SpecialChar"><-</span> convert result
<span id="L70" class="LineNr">70 </span> <a href='../../405screen.mu.html#L480'>print-int32-decimal</a> <a href='../../405screen.mu.html#L9'>screen</a>, result-int
<span id="L71" class="LineNr">71 </span> <a href='../../405screen.mu.html#L169'>print-string</a> <a href='../../405screen.mu.html#L9'>screen</a>, <span class="Constant">" "</span>
<span id="L72" class="LineNr">72 </span> <span class="muComment"># print 255 * c->g</span>
<span id="L73" class="LineNr">73 </span> src-addr <span class="SpecialChar"><-</span> <a href='../../131table.subx.html#L26'>get</a> c, g
<span id="L74" class="LineNr">74 </span> result <span class="SpecialChar"><-</span> copy xn
<span id="L75" class="LineNr">75 </span> result <span class="SpecialChar"><-</span> multiply *src-addr
<span id="L76" class="LineNr">76 </span> result-int <span class="SpecialChar"><-</span> convert result
<span id="L77" class="LineNr">77 </span> <a href='../../405screen.mu.html#L480'>print-int32-decimal</a> <a href='../../405screen.mu.html#L9'>screen</a>, result-int
<span id="L78" class="LineNr">78 </span> <a href='../../405screen.mu.html#L169'>print-string</a> <a href='../../405screen.mu.html#L9'>screen</a>, <span class="Constant">" "</span>
<span id="L79" class="LineNr">79 </span> <span class="muComment"># print 255 * c->b</span>
<span id="L80" class="LineNr">80 </span> src-addr <span class="SpecialChar"><-</span> <a href='../../131table.subx.html#L26'>get</a> c, b
<span id="L81" class="LineNr">81 </span> result <span class="SpecialChar"><-</span> copy xn
<span id="L82" class="LineNr">82 </span> result <span class="SpecialChar"><-</span> multiply *src-addr
<span id="L83" class="LineNr">83 </span> result-int <span class="SpecialChar"><-</span> convert result
<span id="L84" class="LineNr">84 </span> <a href='../../405screen.mu.html#L480'>print-int32-decimal</a> <a href='../../405screen.mu.html#L9'>screen</a>, result-int
<span id="L85" class="LineNr">85 </span> <a href='../../405screen.mu.html#L169'>print-string</a> <a href='../../405screen.mu.html#L9'>screen</a>, <span class="Constant">"\n"</span>
<span id="L86" class="LineNr">86 </span><span class="Delimiter">}</span>
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