vox_3dbmp.d

   1 module vox_3dbmp;
   2
   3 import iv.bclamp;
   4 import iv.glbinds.utils;
   5 import iv.cmdcongl;
   6 import iv.strex;
   7 import iv.vfs;
   8 import iv.vfs.io;
   9 import iv.vmath;
  10
  11
  12 // ////////////////////////////////////////////////////////////////////////// //
  13 /*
  14   this is just a voxel cube, where each voxel represents by one bit.
  15   it is useful for fast "yes/no" queries and modifications, and is used
  16   in "hollow fill" and t-junction fixer algorithms.
  17  */
  18 struct Vox3DBitmap {
  19   uint xsize = 0, ysize = 0, zsize = 0;
  20   uint xwdt = 0, xywdt = 0;
  21   uint[] bmp; // bit per voxel
  22
  23 public:
  24   void clear () {
  25     delete bmp; bmp = null;
  26     xsize = ysize = zsize = xwdt = xywdt = 0;
  27   }
  28
  29   void setSize (uint xs, uint ys, uint zs) {
  30     clear();
  31     if (!xs || !ys || !zs) return;
  32     xsize = xs;
  33     ysize = ys;
  34     zsize = zs;
  35     xwdt = (xs+31)/32;
  36     assert(xwdt<<5 >= xs);
  37     xywdt = xwdt*ysize;
  38     bmp = new uint[xywdt*zsize];
  39     bmp[] = 0;
  40   }
  41
  42   // returns old value
  43   uint setPixel (int x, int y, int z) nothrow @trusted @nogc {
  44     pragma(inline, true);
  45     if (x < 0 || y < 0 || z < 0) return 1;
  46     if (cast(uint)x >= xsize || cast(uint)y >= ysize || cast(uint)z >= zsize) return 1;
  47     uint *bp = bmp.ptr+cast(uint)z*xywdt+cast(uint)y*xwdt+(cast(uint)x>>5);
  48     const uint bmask = 1U<<(cast(uint)x&0x1f);
  49     const uint res = (*bp)&bmask;
  50     *bp |= bmask;
  51     return res;
  52   }
  53
  54   void resetPixel (int x, int y, int z) nothrow @trusted @nogc {
  55     pragma(inline, true);
  56     if (x < 0 || y < 0 || z < 0) return;
  57     if (cast(uint)x >= xsize || cast(uint)y >= ysize || cast(uint)z >= zsize) return;
  58     bmp.ptr[cast(uint)z*xywdt+cast(uint)y*xwdt+(cast(uint)x>>5)] &= ~(1U<<(cast(uint)x&0x1f));
  59   }
  60
  61   uint getPixel (int x, int y, int z) const nothrow @trusted @nogc {
  62     pragma(inline, true);
  63     if (x < 0 || y < 0 || z < 0) return 1;
  64     if (cast(uint)x >= xsize || cast(uint)y >= ysize || cast(uint)z >= zsize) return 1;
  65     return (bmp.ptr[cast(uint)z*xywdt+cast(uint)y*xwdt+(cast(uint)x>>5)]&(1U<<(cast(uint)x&0x1f)));
  66   }
  67 }