1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
|
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Mu - linux/apps/raytracing/2.mu</title>
<meta name="Generator" content="Vim/8.2">
<meta name="plugin-version" content="vim8.1_v2">
<meta name="syntax" content="none">
<meta name="settings" content="number_lines,use_css,pre_wrap,no_foldcolumn,expand_tabs,line_ids,prevent_copy=,use_input_for_pc=fallback">
<meta name="colorscheme" content="minimal-light">
<style>
<!--
pre { white-space: pre-wrap; font-family: monospace; color: #000000; background-color: #ffffd7; }
body { font-size:12pt; font-family: monospace; color: #000000; background-color: #ffffd7; }
a { color:inherit; }
* { font-size:12pt; font-size: 1em; }
.PreProc { color: #c000c0; }
.muRegEdx { color: #af5f00; }
.Special { color: #ff6060; }
.LineNr { }
.muRegEsi { color: #005faf; }
.muRegEbx { color: #5f00ff; }
.Constant { color: #008787; }
.muRegEcx { color: #870000; }
.Delimiter { color: #c000c0; }
.muFunction { color: #af5f00; text-decoration: underline; }
.CommentedCode { color: #8a8a8a; }
.muComment { color: #005faf; }
-->
</style>
<script>
<!--
/* function to open any folds containing a jumped-to line before jumping to it */
function JumpToLine()
{
var lineNum;
lineNum = window.location.hash;
lineNum = lineNum.substr(1); /* strip off '#' */
if (lineNum.indexOf('L') == -1) {
lineNum = 'L'+lineNum;
}
var lineElem = document.getElementById(lineNum);
/* Always jump to new location even if the line was hidden inside a fold, or
* we corrected the raw number to a line ID.
*/
if (lineElem) {
lineElem.scrollIntoView(true);
}
return true;
}
if ('onhashchange' in window) {
window.onhashchange = JumpToLine;
}
-->
</script>
</head>
<body onload='JumpToLine();'>
<a href='https://github.com/akkartik/mu/blob/main/linux/apps/raytracing/2.mu'>https://github.com/akkartik/mu/blob/main/linux/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/linux</span>
<span id="L6" class="LineNr"> 6 </span><span class="muComment"># $ ./translate 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="muRegEbx">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="muRegEdx">edx</span>: int <span class="Special"><-</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="Special"><-</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="Special"><-</span> reciprocal four
<span id="L14" class="LineNr">14 </span> <span class="PreProc">var</span> max/<span class="muRegEdx">edx</span>: int <span class="Special"><-</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="Special"><-</span> convert max
<span id="L16" class="LineNr">16 </span> <span class="PreProc">var</span> j/<span class="muRegEcx">ecx</span>: int <span class="Special"><-</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/eax: int <span class="Special"><-</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="Special"><-</span> convert i
<span id="L27" class="LineNr">27 </span> tmp <span class="Special"><-</span> divide image-size
<span id="L28" class="LineNr">28 </span> <span class="PreProc">var</span> r-addr/<span class="muRegEdx">edx</span>: (addr float) <span class="Special"><-</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="Special"><-</span> convert j
<span id="L35" class="LineNr">35 </span> tmp <span class="Special"><-</span> divide image-size
<span id="L36" class="LineNr">36 </span> <span class="PreProc">var</span> g-addr/<span class="muRegEdx">edx</span>: (addr float) <span class="Special"><-</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="muRegEdx">edx</span>: (addr float) <span class="Special"><-</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="muRegEdx">edx</span>: (addr rgb) <span class="Special"><-</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="Special"><-</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="Special"><-</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="muRegEsi">esi</span>: (addr rgb) <span class="Special"><-</span> copy _c
<span id="L63" class="LineNr">63 </span> <span class="PreProc">var</span> n/<span class="muRegEcx">ecx</span>: int <span class="Special"><-</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="Special"><-</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="Special"><-</span> copy xn
<span id="L67" class="LineNr">67 </span> <span class="PreProc">var</span> src-addr/eax: (addr float) <span class="Special"><-</span> <a href='../../131table.subx.html#L26'>get</a> c, r
<span id="L68" class="LineNr">68 </span> result <span class="Special"><-</span> multiply *src-addr
<span id="L69" class="LineNr">69 </span> <span class="PreProc">var</span> result-int/<span class="muRegEdx">edx</span>: int <span class="Special"><-</span> convert result
<span id="L70" class="LineNr">70 </span> <a href='../../405screen.mu.html#L484'>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="Special"><-</span> <a href='../../131table.subx.html#L26'>get</a> c, g
<span id="L74" class="LineNr">74 </span> result <span class="Special"><-</span> copy xn
<span id="L75" class="LineNr">75 </span> result <span class="Special"><-</span> multiply *src-addr
<span id="L76" class="LineNr">76 </span> result-int <span class="Special"><-</span> convert result
<span id="L77" class="LineNr">77 </span> <a href='../../405screen.mu.html#L484'>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="Special"><-</span> <a href='../../131table.subx.html#L26'>get</a> c, b
<span id="L81" class="LineNr">81 </span> result <span class="Special"><-</span> copy xn
<span id="L82" class="LineNr">82 </span> result <span class="Special"><-</span> multiply *src-addr
<span id="L83" class="LineNr">83 </span> result-int <span class="Special"><-</span> convert result
<span id="L84" class="LineNr">84 </span> <a href='../../405screen.mu.html#L484'>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>
</pre>
</body>
</html>
<!-- vim: set foldmethod=manual : -->
|