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 pipe_viewport_state *vpt = &nv40->viewport;
   7         struct nouveau_stateobj *so;
   8         unsigned bypass;
   9
  10         if (nv40->render_mode == HW &&
  11             !nv40->rasterizer->pipe.bypass_vs_clip_and_viewport)
  12                 bypass = 0;
  13         else
  14                 bypass = 1;
  15
  16         if (nv40->state.hw[NV40_STATE_VIEWPORT] &&
  17             (bypass || !(nv40->dirty & NV40_NEW_VIEWPORT)) &&
  18             nv40->state.viewport_bypass == bypass)
  19                 return FALSE;
  20         nv40->state.viewport_bypass = bypass;
  21
  22         so = so_new(2, 9, 0);
  23         if (!bypass) {
  24                 so_method(so, nv40->screen->curie,
  25                           NV40TCL_VIEWPORT_TRANSLATE_X, 8);
  26                 so_data  (so, fui(vpt->translate[0]));
  27                 so_data  (so, fui(vpt->translate[1]));
  28                 so_data  (so, fui(vpt->translate[2]));
  29                 so_data  (so, fui(vpt->translate[3]));
  30                 so_data  (so, fui(vpt->scale[0]));
  31                 so_data  (so, fui(vpt->scale[1]));
  32                 so_data  (so, fui(vpt->scale[2]));
  33                 so_data  (so, fui(vpt->scale[3]));
  34                 so_method(so, nv40->screen->curie, 0x1d78, 1);
  35                 so_data  (so, 1);
  36         } else {
  37                 so_method(so, nv40->screen->curie,
  38                           NV40TCL_VIEWPORT_TRANSLATE_X, 8);
  39                 so_data  (so, fui(0.0));
  40                 so_data  (so, fui(0.0));
  41                 so_data  (so, fui(0.0));
  42                 so_data  (so, fui(0.0));
  43                 so_data  (so, fui(1.0));
  44                 so_data  (so, fui(1.0));
  45                 so_data  (so, fui(1.0));
  46                 so_data  (so, fui(0.0));
  47                 /* Not entirely certain what this is yet.  The DDX uses this
  48                  * value also as it fixes rendering when you pass
  49                  * pre-transformed vertices to the GPU.  My best gusss is that
  50                  * this bypasses some culling/clipping stage.  Might be worth
  51                  * noting that points/lines are uneffected by whatever this
  52                  * value fixes, only filled polygons are effected.
  53                  */
  54                 so_method(so, nv40->screen->curie, 0x1d78, 1);
  55                 so_data  (so, 0x110);
  56         }
  57
  58         so_ref(so, &nv40->state.hw[NV40_STATE_VIEWPORT]);
  59         so_ref(NULL, &so);
  60         return TRUE;
  61 }
  62
  63 struct nv40_state_entry nv40_state_viewport = {
  64         .validate = nv40_state_viewport_validate,
  65         .dirty = {
  66                 .pipe = NV40_NEW_VIEWPORT | NV40_NEW_RAST,
  67                 .hw = NV40_STATE_VIEWPORT
  68         }
  69 };