mu - Soul of a tiny new machine. More thorough tests → More comprehensible and rewrite-friendly software → More resilient society.

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<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Mu - 507line.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>  </style> <script>  </script> </head> <body onload='JumpToLine();'> <a href='https://github.com/akkartik/mu/blob/main/507line.mu'>https://github.com/akkartik/mu/blob/main/507line.mu</a> <pre id='vimCodeElement'> 1 fn <a href='507line.mu.html#L1'>draw-line</a> <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 { 2 var dx: int 3 var dy: int 4 var sx: int 5 var sy: int 6 var err: int 7 # dx = abs(x1-x0) 8 var tmp2/ecx: int <- copy x1 9 tmp2 <- subtract x0 10 var tmp/eax: int <- <a href='506math.mu.html#L1'>abs</a> tmp2 11 copy-to dx, tmp 12 # sx = sgn(x1-x0) 13 tmp <- <a href='506math.mu.html#L10'>sgn</a> tmp2 14 copy-to sx, tmp 15 # dy = -abs(y1-y0) 16 tmp2 <- copy y1 17 tmp2 <- subtract y0 18 tmp <- <a href='506math.mu.html#L1'>abs</a> tmp2 19 tmp <- negate 20 copy-to dy, tmp 21 # sy = sgn(y1-y0) 22 tmp <- <a href='506math.mu.html#L10'>sgn</a> tmp2 23 copy-to sy, tmp 24 # err = dx + dy 25 tmp <- copy dy 26 tmp <- add dx 27 copy-to err, tmp 28 # 29 var x/ecx: int <- copy x0 30 var y/edx: int <- copy y0 31 $draw-line:loop: { 32 <a href='500fake-screen.mu.html#L483'>pixel</a> <a href='500fake-screen.mu.html#L14'>screen</a>, x, y, color 33 # if (x == x1 && y == y1) break 34 { 35 compare x, x1 36 break-if-!= 37 compare y, y1 38 break-if-!= 39 break $draw-line:loop 40 } 41 # e2 = err*2 42 var e2/ebx: int <- copy err 43 e2 <- shift-left 1 44 # if (e2 >= dy) { err += dy; x += sx; } 45 { 46 compare e2, dy 47 break-if-< 48 tmp <- copy dy 49 add-to err, tmp 50 x <- add sx 51 } 52 # if (e2 <= dx) { err += dx; y += sy; } 53 { 54 compare e2, dx 55 break-if-> 56 tmp <- copy dx 57 add-to err, tmp 58 y <- add sy 59 } 60 loop 61 } 62 } 63 64 fn <a href='507line.mu.html#L64'>draw-horizontal-line</a> <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 { 65 var x/eax: int <- copy x0 66 { 67 compare x, x1 68 break-if->= 69 <a href='500fake-screen.mu.html#L483'>pixel</a> <a href='500fake-screen.mu.html#L14'>screen</a>, x, y, color 70 x <- increment 71 loop 72 } 73 } 74 75 fn <a href='507line.mu.html#L75'>draw-vertical-line</a> <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 { 76 var y/eax: int <- copy y0 77 { 78 compare y, y1 79 break-if->= 80 <a href='500fake-screen.mu.html#L483'>pixel</a> <a href='500fake-screen.mu.html#L14'>screen</a>, x, y, color 81 y <- increment 82 loop 83 } 84 } 85 86 fn <a href='507line.mu.html#L86'>draw-rect</a> <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 { 87 var y/eax: int <- copy ymin 88 { 89 compare y, ymax 90 break-if->= 91 <a href='507line.mu.html#L64'>draw-horizontal-line</a> <a href='500fake-screen.mu.html#L14'>screen</a>, y, xmin, xmax, color 92 y <- increment 93 loop 94 } 95 } 96 97 # 0 <= u <= 1 98 fn <a href='507line.mu.html#L98'>line-point</a> u: float, x0: int, x1: int -> _/eax: int { 99 var one/eax: int <- copy 1 100 var u-prime/xmm0: float <- convert one 101 u-prime <- subtract u 102 var result/xmm1: float <- convert x0 103 result <- multiply u-prime 104 var term2/xmm2: float <- convert x1 105 term2 <- multiply u 106 result <- add term2 107 var result/eax: int <- convert result 108 return result 109 } </pre> </body> </html>


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