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TomAwezome 48d4f999cb Update documentation.
2021-12-11 06:10:58 -05:00

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<a name="l1"></a><span class=cF0>#</span><span class=cF1>define</span><span class=cF0> VGAP_IDX </span><span class=cFE>0x3C4</span><span class=cF0>
<a name="l2"></a>#</span><span class=cF1>define</span><span class=cF0> VGAP_DATA </span><span class=cFE>0x3C5</span><span class=cF0>
<a name="l3"></a>#</span><span class=cF1>define</span><span class=cF0> VGAR_MAP_MASK </span><span class=cFE>0x02</span><span class=cF0>
<a name="l4"></a>
<a name="l5"></a></span><span class=cF1>U8</span><span class=cF0> rev[</span><span class=cFE>256</span><span class=cF0>], </span><span class=cF2>//The VGA bits are backward</span><span class=cF0>
<a name="l6"></a> image[</span><span class=cFE>640</span><span class=cF0> * </span><span class=cFE>480</span><span class=cF0> / </span><span class=cFE>8</span><span class=cF0>]; </span><span class=cF2>//We need read-modify write.</span><span class=cF0>
<a name="l7"></a> </span><span class=cF2>//0xA0000 alias memory can't be read.</span><span class=cF0>
<a name="l8"></a>
<a name="l9"></a></span><span class=cF1>U0</span><span class=cF0> MGInit()
<a name="l10"></a>{
<a name="l11"></a> </span><span class=cF9>I64</span><span class=cF0> i, j;
<a name="l12"></a>
<a name="l13"></a> </span><span class=cF5>MemSet</span><span class=cF0>(image, </span><span class=cFE>0</span><span class=cF0>, </span><span class=cF1>sizeof</span><span class=cF7>(</span><span class=cF0>image</span><span class=cF7>)</span><span class=cF0>);
<a name="l14"></a> </span><span class=cF5>MemSet</span><span class=cF0>(rev, </span><span class=cFE>0</span><span class=cF0>, </span><span class=cF1>sizeof</span><span class=cF7>(</span><span class=cF0>rev</span><span class=cF7>)</span><span class=cF0>);
<a name="l15"></a> </span><span class=cF1>for</span><span class=cF0> (i = </span><span class=cFE>0</span><span class=cF0>; i &lt; </span><span class=cFE>256</span><span class=cF0>; i++)
<a name="l16"></a> </span><span class=cF1>for</span><span class=cF0> (j = </span><span class=cFE>0</span><span class=cF0>; j &lt; </span><span class=cFE>8</span><span class=cF0>; j++)
<a name="l17"></a> </span><span class=cF1>if</span><span class=cF0> (</span><span class=cF5>Bt</span><span class=cF7>(</span><span class=cF0>&amp;i, j</span><span class=cF7>)</span><span class=cF0>)
<a name="l18"></a> </span><span class=cF5>Bts</span><span class=cF0>(&amp;rev[i], </span><span class=cFE>7</span><span class=cF0> - j);
<a name="l19"></a>}
<a name="l20"></a>
<a name="l21"></a></span><span class=cF1>U0</span><span class=cF0> MGUpdate()
<a name="l22"></a>{</span><span class=cF2>//Copy image to VGA memory</span><span class=cF0>
<a name="l23"></a></span><span class=cF2>//For better performance we could only write what's changed.</span><span class=cF0>
<a name="l24"></a> </span><span class=cF2>//0xA0000 alias is slower than normal RAM.</span><span class=cF0>
<a name="l25"></a> </span><span class=cF5>OutU8</span><span class=cF0>(VGAP_IDX, VGAR_MAP_MASK);
<a name="l26"></a> </span><span class=cF5>OutU8</span><span class=cF0>(VGAP_DATA, </span><span class=cFE>0xF</span><span class=cF0>);</span><span class=cF2>//All color planes at once -- Black and White</span><span class=cF0>
<a name="l27"></a> </span><span class=cF5>MemCopy</span><span class=cF0>(</span><span class=cFB>text</span><span class=cF0>.vga_alias, image,</span><span class=cF1>sizeof</span><span class=cF7>(</span><span class=cF0>image</span><span class=cF7>)</span><span class=cF0>); </span><span class=cF2>//Alias of 0xA0000</span><span class=cF0>
<a name="l28"></a>}
<a name="l29"></a>
<a name="l30"></a></span><span class=cF1>U0</span><span class=cF0> MGPlot(</span><span class=cF9>I64</span><span class=cF0> x,</span><span class=cF9>I64</span><span class=cF0> y)
<a name="l31"></a>{
<a name="l32"></a> </span><span class=cF1>if</span><span class=cF0> (</span><span class=cFE>0</span><span class=cF0> &lt;= x &lt; </span><span class=cFE>640</span><span class=cF0> &amp;&amp; </span><span class=cFE>0</span><span class=cF0> &lt;= y &lt; </span><span class=cFE>480</span><span class=cF0>)
<a name="l33"></a> </span><span class=cF5>Bts</span><span class=cF0>(image,y * </span><span class=cFE>640</span><span class=cF0> + x ^ </span><span class=cFE>7</span><span class=cF0>);
<a name="l34"></a>}
<a name="l35"></a>
<a name="l36"></a></span><span class=cF1>U0</span><span class=cF0> MGHLine(</span><span class=cF9>I64</span><span class=cF0> x1, </span><span class=cF9>I64</span><span class=cF0> x2, </span><span class=cF9>I64</span><span class=cF0> y)
<a name="l37"></a>{</span><span class=cF2>//Warning! No clipping</span><span class=cF0>
<a name="l38"></a></span><span class=cF2>//For performance, we do as many whole-bytes as possible.</span><span class=cF0>
<a name="l39"></a> </span><span class=cF1>U8</span><span class=cF0> *ptr;
<a name="l40"></a> </span><span class=cF9>I64</span><span class=cF0> i, w, leading, trailing, whole_bytes;
<a name="l41"></a>
<a name="l42"></a> </span><span class=cF1>if</span><span class=cF0> (x2 &lt; x1)
<a name="l43"></a> </span><span class=cF5>SwapI64</span><span class=cF0>(&amp;x1, &amp;x2);
<a name="l44"></a> ptr = image + y * </span><span class=cFE>640</span><span class=cF0> / </span><span class=cFE>8</span><span class=cF0> + x1 &gt;&gt; </span><span class=cFE>3</span><span class=cF0>;
<a name="l45"></a> w = x2 - x1 + </span><span class=cFE>1</span><span class=cF0>;
<a name="l46"></a> leading = </span><span class=cFE>8</span><span class=cF0> - x1 &amp; </span><span class=cFE>7</span><span class=cF0>;
<a name="l47"></a> trailing = (x2 + </span><span class=cFE>1</span><span class=cF0>) &amp; </span><span class=cFE>7</span><span class=cF0>;
<a name="l48"></a> </span><span class=cF1>if</span><span class=cF0> (leading + trailing &gt; w)
<a name="l49"></a> *ptr |= rev[(</span><span class=cFE>0xFF00</span><span class=cF0> &gt;&gt; leading &amp; </span><span class=cF7>(</span><span class=cFE>0x00FF</span><span class=cF0> &lt;&lt; trailing</span><span class=cF7>)</span><span class=cF0> &gt;&gt; </span><span class=cFE>8</span><span class=cF0>)];
<a name="l50"></a> </span><span class=cF1>else</span><span class=cF0>
<a name="l51"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l52"></a> whole_bytes = (w - leading - trailing) &gt;&gt; </span><span class=cFE>3</span><span class=cF0>;
<a name="l53"></a> </span><span class=cF1>if</span><span class=cF0> (leading)
<a name="l54"></a> *ptr++ |= rev[(</span><span class=cFE>0xFF00</span><span class=cF0> &gt;&gt; leading) &amp; </span><span class=cFE>0xFF</span><span class=cF0>];
<a name="l55"></a> </span><span class=cF1>for</span><span class=cF0> (i = </span><span class=cFE>0</span><span class=cF0>; i &lt; whole_bytes; i++)
<a name="l56"></a> *ptr++ = </span><span class=cFE>0xFF</span><span class=cF0>;
<a name="l57"></a> </span><span class=cF1>if</span><span class=cF0> (trailing)
<a name="l58"></a> *ptr++ |= rev[(</span><span class=cFE>0x00FF</span><span class=cF0> &lt;&lt; trailing) &gt;&gt; </span><span class=cFE>8</span><span class=cF0>];
<a name="l59"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l60"></a>}
<a name="l61"></a>
<a name="l62"></a></span><span class=cF1>U0</span><span class=cF0> MGLine(</span><span class=cF9>I64</span><span class=cF0> x1,</span><span class=cF9>I64</span><span class=cF0> y1,</span><span class=cF9>I64</span><span class=cF0> x2,</span><span class=cF9>I64</span><span class=cF0> y2)
<a name="l63"></a>{</span><span class=cF2>//Warning! No clipping</span><span class=cF0>
<a name="l64"></a> </span><span class=cF9>I64</span><span class=cF0> dx=x2-x1,dy=y2-y1;
<a name="l65"></a>
<a name="l66"></a> x1 &lt;&lt;= </span><span class=cFE>32</span><span class=cF0>; x2 &lt;&lt;= </span><span class=cFE>32</span><span class=cF0>;
<a name="l67"></a> y1 &lt;&lt;= </span><span class=cFE>32</span><span class=cF0>; y2 &lt;&lt;= </span><span class=cFE>32</span><span class=cF0>;
<a name="l68"></a> </span><span class=cF1>if</span><span class=cF0> (</span><span class=cF5>AbsI64</span><span class=cF7>(</span><span class=cF0>dx</span><span class=cF7>)</span><span class=cF0> &gt; </span><span class=cF5>AbsI64</span><span class=cF7>(</span><span class=cF0>dy</span><span class=cF7>)</span><span class=cF0>)
<a name="l69"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l70"></a> dy = dy &lt;&lt; </span><span class=cFE>32</span><span class=cF0> / </span><span class=cF5>AbsI64</span><span class=cF0>(dx);
<a name="l71"></a> dx = </span><span class=cF5>SignI64</span><span class=cF0>(dx) &lt;&lt; </span><span class=cFE>32</span><span class=cF0>;
<a name="l72"></a> </span><span class=cF1>while</span><span class=cF0> (x1 != x2)
<a name="l73"></a> {
<a name="l74"></a> MGPlot(x1.i32[</span><span class=cFE>1</span><span class=cF0>], y1.i32[</span><span class=cFE>1</span><span class=cF0>]);
<a name="l75"></a> x1 += dx; y1 += dy;
<a name="l76"></a> }
<a name="l77"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l78"></a> </span><span class=cF1>else</span><span class=cF0>
<a name="l79"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l80"></a> dx = dx &lt;&lt; </span><span class=cFE>32</span><span class=cF0> / </span><span class=cF5>AbsI64</span><span class=cF0>(dy);
<a name="l81"></a> dy = </span><span class=cF5>SignI64</span><span class=cF0>(dy) &lt;&lt; </span><span class=cFE>32</span><span class=cF0>;
<a name="l82"></a> </span><span class=cF1>while</span><span class=cF0> (y1 != y2)
<a name="l83"></a> {
<a name="l84"></a> MGPlot(x1.i32[</span><span class=cFE>1</span><span class=cF0>], y1.i32[</span><span class=cFE>1</span><span class=cF0>]);
<a name="l85"></a> x1 += dx;
<a name="l86"></a> y1 += dy;
<a name="l87"></a> }
<a name="l88"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l89"></a> MGPlot(x1.i32[</span><span class=cFE>1</span><span class=cF0>], y1.i32[</span><span class=cFE>1</span><span class=cF0>]);
<a name="l90"></a>}
<a name="l91"></a>
<a name="l92"></a></span><span class=cF1>U0</span><span class=cF0> MGCircle(</span><span class=cF9>I64</span><span class=cF0> x, </span><span class=cF9>I64</span><span class=cF0> y, </span><span class=cF1>F64</span><span class=cF0> r)
<a name="l93"></a>{
<a name="l94"></a> </span><span class=cF1>F64</span><span class=cF0> s, c, x1, y1, x2, y2;
<a name="l95"></a> </span><span class=cF9>I64</span><span class=cF0> len;
<a name="l96"></a>
<a name="l97"></a> </span><span class=cF1>if</span><span class=cF0> (r &lt; </span><span class=cFE>0</span><span class=cF0>)
<a name="l98"></a> </span><span class=cF1>return</span><span class=cF0>;
<a name="l99"></a> x1 = r;
<a name="l100"></a> y1 = </span><span class=cFE>0</span><span class=cF0>;
<a name="l101"></a> c = </span><span class=cF5>Cos</span><span class=cF0>(</span><span class=cFE>1</span><span class=cF0> / r);
<a name="l102"></a> s = </span><span class=cF5>Sin</span><span class=cF0>(</span><span class=cFE>1</span><span class=cF0> / r);
<a name="l103"></a> len = </span><span class=cFE>2</span><span class=cF0> * r * </span><span class=cF3>pi</span><span class=cF0>;
<a name="l104"></a> MGPlot(x + x1, y + y1);
<a name="l105"></a> </span><span class=cF1>while</span><span class=cF0> (len-- &gt;= </span><span class=cFE>0</span><span class=cF0>)
<a name="l106"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l107"></a>
<a name="l108"></a> </span><span class=cF2>//m1@a1 * m2@a2 </span><span class=cF0> </span><span class=cF2>= m1*m2@(arg1+arg2)</span><span class=cF0>
<a name="l109"></a>
<a name="l110"></a> </span><span class=cF2>//(x1+y1i)*(x2+y2i) = x1*x2+(x1*y1+x2*y2)i-y1*y2</span><span class=cF0>
<a name="l111"></a>
<a name="l112"></a> </span><span class=cF2>// meti=mCos(t)+imSin(t)</span><span class=cF0>
<a name="l113"></a>
<a name="l114"></a> x2 = x1;
<a name="l115"></a> y2 = y1;
<a name="l116"></a> x1 = c * x2 - s * y2;
<a name="l117"></a> y1 = s * x2 + c * y2;
<a name="l118"></a> MGPlot(x+x1,y+y1);
<a name="l119"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l120"></a>}
<a name="l121"></a>
<a name="l122"></a>
<a name="l123"></a></span><span class=cF1>U0</span><span class=cF0> MiniGrLibDemo()
<a name="l124"></a>{
<a name="l125"></a> </span><span class=cF9>I64</span><span class=cF0> i;
<a name="l126"></a> MGInit;
<a name="l127"></a>
<a name="l128"></a> </span><span class=cF1>for</span><span class=cF0> (i = </span><span class=cFE>0</span><span class=cF0>; i &lt; </span><span class=cFE>100</span><span class=cF0>; i++)
<a name="l129"></a> MGHLine(</span><span class=cFE>200</span><span class=cF0> + i, </span><span class=cFE>400</span><span class=cF0> + i, </span><span class=cFE>300</span><span class=cF0> + i);
<a name="l130"></a>
<a name="l131"></a> </span><span class=cF1>for</span><span class=cF0> (i = </span><span class=cFE>0</span><span class=cF0>; i &lt; </span><span class=cFE>500</span><span class=cF0>; i += </span><span class=cFE>10</span><span class=cF0>)
<a name="l132"></a> MGLine(i, </span><span class=cFE>0</span><span class=cF0>, </span><span class=cFE>0</span><span class=cF0>, </span><span class=cFE>480</span><span class=cF0> - i);
<a name="l133"></a>
<a name="l134"></a> </span><span class=cF1>for</span><span class=cF0> (i = </span><span class=cFE>0</span><span class=cF0>; i &lt; </span><span class=cFE>300</span><span class=cF0>; i += </span><span class=cFE>4</span><span class=cF0>)
<a name="l135"></a> MGCircle(</span><span class=cFE>200</span><span class=cF0>, </span><span class=cFE>100</span><span class=cF0> + i, i);
<a name="l136"></a> MGUpdate;
<a name="l137"></a> </span><span class=cF5>Busy</span><span class=cF0>(</span><span class=cFE>1500000</span><span class=cF0>);
<a name="l138"></a></span><span class=cF2>/*</span><span class=cF0>
<a name="l139"></a></span><span class=cF2>We are returning graphics to normal operations under ZealOS.</span><span class=cF0>
<a name="l140"></a></span><span class=cF2>It is not normal to by-pass the ZealOS graphcis routines.</span><span class=cF0>
<a name="l141"></a></span><span class=cF2>The ZealOS graphics don't know VGA has changed.</span><span class=cF0>
<a name="l142"></a></span><span class=cF2>This bit tells ZealOS to update whole screen.</span><span class=cF0>
<a name="l143"></a></span><span class=cF2>*/</span><span class=cF0>
<a name="l144"></a> </span><span class=cF2>//&lt;CTRL-ALT-v&gt; will flush screen VGA cache.</span><span class=cF0>
<a name="l145"></a> </span><span class=cF5>LFBFlush</span><span class=cF0>;
<a name="l146"></a>}
<a name="l147"></a>
<a name="l148"></a>MiniGrLibDemo;</span></pre></body>
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