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/**************************************************************************
*
* Copyright 2010, VMware, inc.
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sub license, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial portions
* of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
* IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
**************************************************************************/
static boolean TAG(do_cliptest)( struct pt_post_vs *pvs,
struct draw_vertex_info *info )
{
struct vertex_header *out = info->verts;
const float *scale = pvs->draw->viewport.scale;
const float *trans = pvs->draw->viewport.translate;
/* const */ float (*plane)[4] = pvs->draw->plane;
const unsigned pos = draw_current_shader_position_output(pvs->draw);
const unsigned ef = pvs->draw->vs.edgeflag_output;
const unsigned nr = pvs->draw->nr_planes;
const unsigned flags = (FLAGS);
unsigned need_pipeline = 0;
unsigned j;
for (j = 0; j < info->count; j++) {
float *position = out->data[pos];
unsigned mask = 0x0;
initialize_vertex_header(out);
if (flags & (DO_CLIP_XY | DO_CLIP_FULL_Z | DO_CLIP_HALF_Z | DO_CLIP_USER)) {
out->clip[0] = position[0];
out->clip[1] = position[1];
out->clip[2] = position[2];
out->clip[3] = position[3];
/* Do the hardwired planes first:
*/
if (flags & DO_CLIP_XY) {
if (-position[0] + position[3] < 0) mask |= (1<<0);
if ( position[0] + position[3] < 0) mask |= (1<<1);
if (-position[1] + position[3] < 0) mask |= (1<<2);
if ( position[1] + position[3] < 0) mask |= (1<<3);
}
/* Clip Z planes according to full cube, half cube or none.
*/
if (flags & DO_CLIP_FULL_Z) {
if ( position[2] + position[3] < 0) mask |= (1<<4);
if (-position[2] + position[3] < 0) mask |= (1<<5);
}
else if (flags & DO_CLIP_HALF_Z) {
if ( position[2] < 0) mask |= (1<<4);
if (-position[2] + position[3] < 0) mask |= (1<<5);
}
if (flags & DO_CLIP_USER) {
unsigned i;
for (i = 6; i < nr; i++) {
if (dot4(position, plane[i]) < 0)
mask |= (1<<i);
}
}
out->clipmask = mask;
need_pipeline |= out->clipmask;
}
if ((flags & DO_VIEWPORT) && mask == 0)
{
/* divide by w */
float w = 1.0f / position[3];
/* Viewport mapping */
position[0] = position[0] * w * scale[0] + trans[0];
position[1] = position[1] * w * scale[1] + trans[1];
position[2] = position[2] * w * scale[2] + trans[2];
position[3] = w;
}
if ((flags & DO_EDGEFLAG) && ef) {
const float *edgeflag = out->data[ef];
out->edgeflag = !(edgeflag[0] != 1.0f);
need_pipeline |= !out->edgeflag;
}
out = (struct vertex_header *)( (char *)out + info->stride );
}
return need_pipeline != 0;
}
#undef FLAGS
#undef TAG
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