src/gallium/drivers/nv40/nv40_state_viewport.c

   1 #include "nv40_context.h"
   2
   3 static boolean
   4 nv40_state_viewport_validate(struct nv40_context *nv40)
   5 {
   6         struct nouveau_stateobj *so = so_new(11, 0);
   7         struct pipe_viewport_state *vpt = &nv40->viewport;
   8         unsigned bypass;
   9
  10         if (nv40->render_mode == HW && !nv40->rasterizer->pipe.bypass_clipping)
  11                 bypass = 0;
  12         else
  13                 bypass = 1;
  14
  15         if (nv40->state.hw[NV40_STATE_VIEWPORT] &&
  16             (bypass || !(nv40->dirty & NV40_NEW_VIEWPORT)) &&
  17             nv40->state.viewport_bypass == bypass)
  18                 return FALSE;
  19         nv40->state.viewport_bypass = bypass;
  20
  21         if (!bypass) {
  22                 so_method(so, nv40->screen->curie,
  23                           NV40TCL_VIEWPORT_TRANSLATE_X, 8);
  24                 so_data  (so, fui(vpt->translate[0]));
  25                 so_data  (so, fui(vpt->translate[1]));
  26                 so_data  (so, fui(vpt->translate[2]));
  27                 so_data  (so, fui(vpt->translate[3]));
  28                 so_data  (so, fui(vpt->scale[0]));
  29                 so_data  (so, fui(vpt->scale[1]));
  30                 so_data  (so, fui(vpt->scale[2]));
  31                 so_data  (so, fui(vpt->scale[3]));
  32                 so_method(so, nv40->screen->curie, 0x1d78, 1);
  33                 so_data  (so, 1);
  34         } else {
  35                 so_method(so, nv40->screen->curie,
  36                           NV40TCL_VIEWPORT_TRANSLATE_X, 8);
  37                 so_data  (so, fui(0.0));
  38                 so_data  (so, fui(0.0));
  39                 so_data  (so, fui(0.0));
  40                 so_data  (so, fui(0.0));
  41                 so_data  (so, fui(1.0));
  42                 so_data  (so, fui(1.0));
  43                 so_data  (so, fui(1.0));
  44                 so_data  (so, fui(0.0));
  45                 /* Not entirely certain what this is yet.  The DDX uses this
  46                  * value also as it fixes rendering when you pass
  47                  * pre-transformed vertices to the GPU.  My best gusss is that
  48                  * this bypasses some culling/clipping stage.  Might be worth
  49                  * noting that points/lines are uneffected by whatever this
  50                  * value fixes, only filled polygons are effected.
  51                  */
  52                 so_method(so, nv40->screen->curie, 0x1d78, 1);
  53                 so_data  (so, 0x110);
  54         }
  55
  56         so_ref(so, &nv40->state.hw[NV40_STATE_VIEWPORT]);
  57         return TRUE;
  58 }
  59
  60 struct nv40_state_entry nv40_state_viewport = {
  61         .validate = nv40_state_viewport_validate,
  62         .dirty = {
  63                 .pipe = NV40_NEW_VIEWPORT | NV40_NEW_RAST,
  64                 .hw = NV40_STATE_VIEWPORT
  65         }
  66 };