src/gallium/auxiliary/draw/draw_cliptest_tmp.h

   1 /**************************************************************************
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   3  * Copyright 2010, VMware, inc.
   4  * All Rights Reserved.
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   7  * copy of this software and associated documentation files (the
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  11  * permit persons to whom the Software is furnished to do so, subject to
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  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
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  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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  25  *
  26  **************************************************************************/
  27
  28
  29
  30 static boolean TAG(do_cliptest)( struct pt_post_vs *pvs,
  31                                  struct draw_vertex_info *info )
  32 {
  33    struct vertex_header *out = info->verts;
  34    const float *scale = pvs->draw->viewport.scale;
  35    const float *trans = pvs->draw->viewport.translate;
  36    /* const */ float (*plane)[4] = pvs->draw->plane;
  37    const unsigned pos = draw_current_shader_position_output(pvs->draw);
  38    const unsigned cv = draw_current_shader_clipvertex_output(pvs->draw);
  39    const unsigned ef = pvs->draw->vs.edgeflag_output;
  40    const unsigned ucp_enable = pvs->draw->rasterizer->clip_plane_enable;
  41    const unsigned flags = (FLAGS);
  42    unsigned need_pipeline = 0;
  43    unsigned j;
  44    unsigned i;
  45
  46    for (j = 0; j < info->count; j++) {
  47       float *position = out->data[pos];
  48       unsigned mask = 0x0;
  49
  50       initialize_vertex_header(out);
  51
  52       if (flags & (DO_CLIP_XY | DO_CLIP_XY_GUARD_BAND |
  53                    DO_CLIP_FULL_Z | DO_CLIP_HALF_Z | DO_CLIP_USER)) {
  54          float *clipvertex = position;
  55
  56          if ((flags & DO_CLIP_USER) && cv != pos)
  57             clipvertex = out->data[cv];
  58
  59          for (i = 0; i < 4; i++) {
  60             out->clip[i] = clipvertex[i];
  61             out->pre_clip_pos[i] = position[i];
  62          }
  63
  64          /* Do the hardwired planes first:
  65           */
  66          if (flags & DO_CLIP_XY_GUARD_BAND) {
  67             if (-0.50 * position[0] + position[3] < 0) mask |= (1<<0);
  68             if ( 0.50 * position[0] + position[3] < 0) mask |= (1<<1);
  69             if (-0.50 * position[1] + position[3] < 0) mask |= (1<<2);
  70             if ( 0.50 * position[1] + position[3] < 0) mask |= (1<<3);
  71          }
  72          else if (flags & DO_CLIP_XY) {
  73             if (-position[0] + position[3] < 0) mask |= (1<<0);
  74             if ( position[0] + position[3] < 0) mask |= (1<<1);
  75             if (-position[1] + position[3] < 0) mask |= (1<<2);
  76             if ( position[1] + position[3] < 0) mask |= (1<<3);
  77          }
  78
  79          /* Clip Z planes according to full cube, half cube or none.
  80           */
  81          if (flags & DO_CLIP_FULL_Z) {
  82             if ( position[2] + position[3] < 0) mask |= (1<<4);
  83             if (-position[2] + position[3] < 0) mask |= (1<<5);
  84          }
  85          else if (flags & DO_CLIP_HALF_Z) {
  86             if ( position[2]               < 0) mask |= (1<<4);
  87             if (-position[2] + position[3] < 0) mask |= (1<<5);
  88          }
  89
  90          if (flags & DO_CLIP_USER) {
  91             unsigned ucp_mask = ucp_enable;
  92
  93             while (ucp_mask) {
  94                unsigned plane_idx = ffs(ucp_mask)-1;
  95                ucp_mask &= ~(1 << plane_idx);
  96                plane_idx += 6;
  97
  98                if (dot4(clipvertex, plane[plane_idx]) < 0) {
  99                   mask |= 1 << plane_idx;
 100                }
 101             }
 102          }
 103
 104          out->clipmask = mask;
 105          need_pipeline |= out->clipmask;
 106       }
 107
 108       if ((flags & DO_VIEWPORT) && mask == 0)
 109       {
 110          /* divide by w */
 111          float w = 1.0f / position[3];
 112
 113          /* Viewport mapping */
 114          position[0] = position[0] * w * scale[0] + trans[0];
 115          position[1] = position[1] * w * scale[1] + trans[1];
 116          position[2] = position[2] * w * scale[2] + trans[2];
 117          position[3] = w;
 118       }
 119
 120       if ((flags & DO_EDGEFLAG) && ef) {
 121          const float *edgeflag = out->data[ef];
 122          out->edgeflag = !(edgeflag[0] != 1.0f);
 123          need_pipeline |= !out->edgeflag;
 124       }
 125
 126       out = (struct vertex_header *)( (char *)out + info->stride );
 127    }
 128
 129    return need_pipeline != 0;
 130 }
 131
 132
 133 #undef FLAGS
 134 #undef TAG