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| author | Kartik Agaram <vc@akkartik.com> | 2021-03-23 17:31:08 -0700 |
|---|---|---|
| committer | Kartik Agaram <vc@akkartik.com> | 2021-03-23 17:31:08 -0700 |
| commit | 3350c34a74844e21ea69077e01efff3bae64bdcd (patch) | |
| tree | fa06ba58542297d1cff6b78958d4547a40a25d21 /html/101screen.subx.html | |
| parent | 62a244211024a8367332541c571621883c05bcce (diff) | |
| download | mu-3350c34a74844e21ea69077e01efff3bae64bdcd.tar.gz | |
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Diffstat (limited to 'html/101screen.subx.html')
| -rw-r--r-- | html/101screen.subx.html | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/html/101screen.subx.html b/html/101screen.subx.html new file mode 100644 index 00000000..df062b67 --- /dev/null +++ b/html/101screen.subx.html @@ -0,0 +1,103 @@ +<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> +<html> +<head> +<meta http-equiv="content-type" content="text/html; charset=UTF-8"> +<title>Mu - 101screen.subx</title> +<meta name="Generator" content="Vim/8.1"> +<meta name="plugin-version" content="vim8.1_v1"> +<meta name="syntax" content="none"> +<meta name="settings" content="number_lines,use_css,pre_wrap,no_foldcolumn,expand_tabs,line_ids,prevent_copy="> +<meta name="colorscheme" content="minimal-light"> +<style type="text/css"> +<!-- +pre { white-space: pre-wrap; font-family: monospace; color: #000000; background-color: #c6c6c6; } +body { font-size:12pt; font-family: monospace; color: #000000; background-color: #c6c6c6; } +a { color:inherit; } +* { font-size:12pt; font-size: 1em; } +.SpecialChar { color: #d70000; } +.subxComment { color: #005faf; } +.subxS1Comment { color: #0000af; } +.LineNr { } +.subxFunction { color: #af5f00; text-decoration: underline; } +.Constant { color: #008787; } +--> +</style> + +<script type='text/javascript'> +<!-- + +/* 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/101screen.subx'>https://github.com/akkartik/mu/blob/main/101screen.subx</a> +<pre id='vimCodeElement'> +<span id="L1" class="LineNr"> 1 </span><span class="subxComment"># Primitives for screen control.</span> +<span id="L2" class="LineNr"> 2 </span><span class="subxComment">#</span> +<span id="L3" class="LineNr"> 3 </span><span class="subxComment"># We need to do this in machine code because Mu doesn't have global variables</span> +<span id="L4" class="LineNr"> 4 </span><span class="subxComment"># yet (for the start of video memory).</span> +<span id="L5" class="LineNr"> 5 </span> +<span id="L6" class="LineNr"> 6 </span>== code +<span id="L7" class="LineNr"> 7 </span> +<span id="L8" class="LineNr"> 8 </span><span class="subxFunction">pixel-on-real-screen</span>: <span class="subxComment"># x: int, y: int, color: int</span> +<span id="L9" class="LineNr"> 9 </span> <span class="subxS1Comment"># . prologue</span> +<span id="L10" class="LineNr">10 </span> 55/push-ebp +<span id="L11" class="LineNr">11 </span> 89/<- %ebp 4/r32/esp +<span id="L12" class="LineNr">12 </span> <span class="subxS1Comment"># . save registers</span> +<span id="L13" class="LineNr">13 </span> 50/push-eax +<span id="L14" class="LineNr">14 </span> 51/push-ecx +<span id="L15" class="LineNr">15 </span> <span class="subxComment"># bounds checks</span> +<span id="L16" class="LineNr">16 </span> 8b/-> *(ebp+8) 0/r32/eax +<span id="L17" class="LineNr">17 </span> 3d/compare-eax-and 0/imm32 +<span id="L18" class="LineNr">18 </span> 7c/jump-if-< $pixel-on-real-screen:end/disp8 +<span id="L19" class="LineNr">19 </span> 3d/compare-eax-and 0x400/imm32/screen-width=1024 +<span id="L20" class="LineNr">20 </span> 7d/jump-if->= $pixel-on-real-screen:end/disp8 +<span id="L21" class="LineNr">21 </span> 8b/-> *(ebp+0xc) 0/r32/eax +<span id="L22" class="LineNr">22 </span> 3d/compare-eax-and 0/imm32 +<span id="L23" class="LineNr">23 </span> 7c/jump-if-< $pixel-on-real-screen:end/disp8 +<span id="L24" class="LineNr">24 </span> 3d/compare-eax-and 0x300/imm32/screen-height=768 +<span id="L25" class="LineNr">25 </span> 7d/jump-if->= $pixel-on-real-screen:end/disp8 +<span id="L26" class="LineNr">26 </span> <span class="subxComment"># eax = y*1024 + x</span> +<span id="L27" class="LineNr">27 </span> 8b/-> *(ebp+0xc) 0/r32/eax +<span id="L28" class="LineNr">28 </span> c1/shift 4/subop/left %eax 0xa/imm8 +<span id="L29" class="LineNr">29 </span> 03/add-> *(ebp+8) 0/r32/eax +<span id="L30" class="LineNr">30 </span> <span class="subxComment"># eax += location of frame buffer</span> +<span id="L31" class="LineNr">31 </span> 03/add-> *<span class="SpecialChar">Video-memory-addr</span> 0/r32/eax +<span id="L32" class="LineNr">32 </span> <span class="subxComment"># *eax = color</span> +<span id="L33" class="LineNr">33 </span> 8b/-> *(ebp+0x10) 1/r32/ecx +<span id="L34" class="LineNr">34 </span> 88/byte<- *eax 1/r32/CL +<span id="L35" class="LineNr">35 </span><span class="Constant">$pixel-on-real-screen:end</span>: +<span id="L36" class="LineNr">36 </span> <span class="subxS1Comment"># . restore registers</span> +<span id="L37" class="LineNr">37 </span> 59/pop-to-ecx +<span id="L38" class="LineNr">38 </span> 58/pop-to-eax +<span id="L39" class="LineNr">39 </span> <span class="subxS1Comment"># . epilogue</span> +<span id="L40" class="LineNr">40 </span> 89/<- %esp 5/r32/ebp +<span id="L41" class="LineNr">41 </span> 5d/pop-to-ebp +<span id="L42" class="LineNr">42 </span> c3/return +</pre> +</body> +</html> +<!-- vim: set foldmethod=manual : --> |