prj/tech/libsrc/r3d/init.c

   1 // $Header: x:/prj/tech/libsrc/r3d/RCS/init.c 1.9 1997/10/03 13:02:13 KEVIN Exp $
   2 // this has the r3d initializers, as well as global state setup
   3
   4 #include <string.h>
   5 #include <ctxts.h>
   6 #include <r3dctxt.h>
   7 #include <_ctxt.h>
   8 #include <_xfrm.h>
   9
  10 r3s_global_context r3d_glob;     // global context
  11 r3s_global_state   r3d_state;    // global state
  12
  13 // more complex call that let's the user set stuff
  14 // trans depth is expected object transform depth
  15 // clip_planes is the number of expected clip planes
  16 void r3_init_defaults(int trans_depth,int clip_planes,r3e_space space,int ctxt_cnt, int stride)
  17 {
  18    r3_init_context( (ctxt_cnt==-1)?R3_DEF_CTXT_STACK:ctxt_cnt );
  19
  20    r3d_state.trans_depth = (trans_depth==-1)?8:trans_depth;
  21    r3d_state.clip_planes = (clip_planes==-1)?4:clip_planes;
  22    r3d_state.space = (space==-1)?R3_CLIPPING_SPACE:space;
  23    r3d_state.stride = (stride==-1)?(sizeof (r3s_point )):stride;
  24
  25    // indicate that there is no current space
  26    r3d_glob.cur_space = -1;
  27
  28    // set world default to turn x into z, y into -x, z into -y
  29    memset(&r3d_state.world,0,sizeof(r3d_state.world));
  30    X2MAT(&r3d_state.world)->m2 = 1.0;
  31    X2MAT(&r3d_state.world)->m3 = -1.0;
  32    X2MAT(&r3d_state.world)->m7 = -1.0;
  33
  34    r3_use_g2(); // set the default driver
  35 }
  36
  37 // simple init call that most users will use, that just uses all the default
  38 void r3_init(void)
  39 {
  40    r3_init_defaults(-1,-1,-1,-1,-1);    // need to do this for real
  41 }
  42
  43 void r3_close(void)
  44 {
  45    r3_close_context();
  46 }
  47
  48 // Sets a world coord system inherited by all subsequent context creations.
  49 // The default is the identity transform.  As well, the handedness bit is set
  50 // in the transform.  If you have a current context.
  51
  52 void r3_set_default_world(mxs_trans *w)
  53 {
  54    // wow, copying structures!
  55    *X2TRANS(&r3d_state.world) = *w;
  56 }
  57
  58 mxs_trans *r3_get_default_world()
  59 {
  60    return X2TRANS(&r3d_state.world);
  61 }
  62
  63 // Sets the default camera space that all new contexts inherit.  The default
  64 // is R3_CLIPPING.
  65
  66 void r3_set_default_space(r3e_space s)
  67 {
  68    r3d_state.space = s;
  69 }
  70
  71 r3e_space r3_get_default_space()
  72 {
  73    return r3d_state.space;
  74 }
  75
  76 void r3_set_default_stride(int stride)
  77 {
  78    r3d_state.stride = stride;
  79 }
  80
  81 int r3_get_default_stride()
  82 {
  83    return r3d_state.stride;
  84 }