reactos/dll/opengl/mesa/src/gallium/auxiliary/draw/draw_cliptest_tmp.h

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  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    unsigned cd[2];
  40    const unsigned ef = pvs->draw->vs.edgeflag_output;
  41    const unsigned ucp_enable = pvs->draw->rasterizer->clip_plane_enable;
  42    const unsigned flags = (FLAGS);
  43    unsigned need_pipeline = 0;
  44    unsigned j;
  45    unsigned i;
  46    bool have_cd = false;
  47    cd[0] = draw_current_shader_clipdistance_output(pvs->draw, 0);
  48    cd[1] = draw_current_shader_clipdistance_output(pvs->draw, 1);
  49
  50    if (cd[0] != pos || cd[1] != pos)
  51      have_cd = true;
  52
  53    for (j = 0; j < info->count; j++) {
  54       float *position = out->data[pos];
  55       unsigned mask = 0x0;
  56
  57       initialize_vertex_header(out);
  58
  59       if (flags & (DO_CLIP_XY | DO_CLIP_XY_GUARD_BAND |
  60                    DO_CLIP_FULL_Z | DO_CLIP_HALF_Z | DO_CLIP_USER)) {
  61          float *clipvertex = position;
  62
  63          if ((flags & DO_CLIP_USER) && cv != pos)
  64             clipvertex = out->data[cv];
  65
  66          for (i = 0; i < 4; i++) {
  67             out->clip[i] = clipvertex[i];
  68             out->pre_clip_pos[i] = position[i];
  69          }
  70
  71          /* Do the hardwired planes first:
  72           */
  73          if (flags & DO_CLIP_XY_GUARD_BAND) {
  74             if (-0.50 * position[0] + position[3] < 0) mask |= (1<<0);
  75             if ( 0.50 * position[0] + position[3] < 0) mask |= (1<<1);
  76             if (-0.50 * position[1] + position[3] < 0) mask |= (1<<2);
  77             if ( 0.50 * position[1] + position[3] < 0) mask |= (1<<3);
  78          }
  79          else if (flags & DO_CLIP_XY) {
  80             if (-position[0] + position[3] < 0) mask |= (1<<0);
  81             if ( position[0] + position[3] < 0) mask |= (1<<1);
  82             if (-position[1] + position[3] < 0) mask |= (1<<2);
  83             if ( position[1] + position[3] < 0) mask |= (1<<3);
  84          }
  85
  86          /* Clip Z planes according to full cube, half cube or none.
  87           */
  88          if (flags & DO_CLIP_FULL_Z) {
  89             if ( position[2] + position[3] < 0) mask |= (1<<4);
  90             if (-position[2] + position[3] < 0) mask |= (1<<5);
  91          }
  92          else if (flags & DO_CLIP_HALF_Z) {
  93             if ( position[2]               < 0) mask |= (1<<4);
  94             if (-position[2] + position[3] < 0) mask |= (1<<5);
  95          }
  96
  97          if (flags & DO_CLIP_USER) {
  98             unsigned ucp_mask = ucp_enable;
  99             int num_written_clipdistance = pvs->draw->vs.vertex_shader->info.num_written_clipdistance;
 100             while (ucp_mask) {
 101                unsigned plane_idx = ffs(ucp_mask)-1;
 102                ucp_mask &= ~(1 << plane_idx);
 103                plane_idx += 6;
 104
 105                /*
 106                 * for user clipping check if we have a clip distance output
 107                 * and the shader has written to it, otherwise use clipvertex
 108                 * to decide when the plane is clipping.
 109                 */
 110                if (have_cd && num_written_clipdistance) {
 111                   float clipdist;
 112                   i = plane_idx - 6;
 113                   out->have_clipdist = 1;
 114                   /* first four clip distance in first vector etc. */
 115                   if (i < 4)
 116                      clipdist = out->data[cd[0]][i];
 117                   else
 118                      clipdist = out->data[cd[1]][i-4];
 119                   if (clipdist < 0)
 120                      mask |= 1 << plane_idx;
 121                } else {
 122                   if (dot4(clipvertex, plane[plane_idx]) < 0)
 123                      mask |= 1 << plane_idx;
 124                }
 125             }
 126          }
 127
 128          out->clipmask = mask;
 129          need_pipeline |= out->clipmask;
 130       }
 131
 132       if ((flags & DO_VIEWPORT) && mask == 0)
 133       {
 134          /* divide by w */
 135          float w = 1.0f / position[3];
 136
 137          /* Viewport mapping */
 138          position[0] = position[0] * w * scale[0] + trans[0];
 139          position[1] = position[1] * w * scale[1] + trans[1];
 140          position[2] = position[2] * w * scale[2] + trans[2];
 141          position[3] = w;
 142       }
 143
 144       if ((flags & DO_EDGEFLAG) && ef) {
 145          const float *edgeflag = out->data[ef];
 146          out->edgeflag = !(edgeflag[0] != 1.0f);
 147          need_pipeline |= !out->edgeflag;
 148       }
 149
 150       out = (struct vertex_header *)( (char *)out + info->stride );
 151    }
 152
 153    return need_pipeline != 0;
 154 }
 155
 156
 157 #undef FLAGS
 158 #undef TAG