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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, |
const struct draw_prim_info *prim_info ) |
{ |
struct vertex_header *out = info->verts; |
/* const */ float (*plane)[4] = pvs->draw->plane; |
const unsigned pos = draw_current_shader_position_output(pvs->draw); |
const unsigned cv = draw_current_shader_clipvertex_output(pvs->draw); |
unsigned cd[2]; |
const unsigned ef = pvs->draw->vs.edgeflag_output; |
unsigned ucp_enable = pvs->draw->rasterizer->clip_plane_enable; |
unsigned flags = (FLAGS); |
unsigned need_pipeline = 0; |
unsigned j; |
unsigned i; |
bool have_cd = false; |
unsigned viewport_index_output = |
draw_current_shader_viewport_index_output(pvs->draw); |
int viewport_index = |
draw_current_shader_uses_viewport_index(pvs->draw) ? |
*((unsigned*)out->data[viewport_index_output]): 0; |
int num_written_clipdistance = |
draw_current_shader_num_written_clipdistances(pvs->draw); |
|
cd[0] = draw_current_shader_clipdistance_output(pvs->draw, 0); |
cd[1] = draw_current_shader_clipdistance_output(pvs->draw, 1); |
|
if (cd[0] != pos || cd[1] != pos) |
have_cd = true; |
|
/* If clipdistance semantic has been written by the shader |
* that means we're expected to do 'user plane clipping' */ |
if (num_written_clipdistance && !(flags & DO_CLIP_USER)) { |
flags |= DO_CLIP_USER; |
ucp_enable = (1 << num_written_clipdistance) - 1; |
} |
|
assert(pos != -1); |
for (j = 0; j < info->count; j++) { |
float *position = out->data[pos]; |
unsigned mask = 0x0; |
float *scale = pvs->draw->viewports[0].scale; |
float *trans = pvs->draw->viewports[0].translate; |
if (draw_current_shader_uses_viewport_index(pvs->draw)) { |
unsigned verts_per_prim = u_vertices_per_prim(prim_info->prim); |
/* only change the viewport_index for the leading vertex */ |
if (!(j % verts_per_prim)) { |
viewport_index = *((unsigned*)out->data[viewport_index_output]); |
viewport_index = draw_clamp_viewport_idx(viewport_index); |
} |
scale = pvs->draw->viewports[viewport_index].scale; |
trans = pvs->draw->viewports[viewport_index].translate; |
} |
|
initialize_vertex_header(out); |
|
if (flags & (DO_CLIP_XY | DO_CLIP_XY_GUARD_BAND | |
DO_CLIP_FULL_Z | DO_CLIP_HALF_Z | DO_CLIP_USER)) { |
float *clipvertex = position; |
|
if ((flags & DO_CLIP_USER) && cv != pos) { |
assert(cv != -1); |
clipvertex = out->data[cv]; |
} |
|
for (i = 0; i < 4; i++) { |
out->clip[i] = clipvertex[i]; |
out->pre_clip_pos[i] = position[i]; |
} |
|
/* Do the hardwired planes first: |
*/ |
if (flags & DO_CLIP_XY_GUARD_BAND) { |
if (-0.50 * position[0] + position[3] < 0) mask |= (1<<0); |
if ( 0.50 * position[0] + position[3] < 0) mask |= (1<<1); |
if (-0.50 * position[1] + position[3] < 0) mask |= (1<<2); |
if ( 0.50 * position[1] + position[3] < 0) mask |= (1<<3); |
} |
else 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 ucp_mask = ucp_enable; |
|
while (ucp_mask) { |
unsigned plane_idx = ffs(ucp_mask)-1; |
ucp_mask &= ~(1 << plane_idx); |
plane_idx += 6; |
|
/* |
* for user clipping check if we have a clip distance output |
* and the shader has written to it, otherwise use clipvertex |
* to decide when the plane is clipping. |
*/ |
if (have_cd && num_written_clipdistance) { |
float clipdist; |
i = plane_idx - 6; |
out->have_clipdist = 1; |
/* first four clip distance in first vector etc. */ |
if (i < 4) |
clipdist = out->data[cd[0]][i]; |
else |
clipdist = out->data[cd[1]][i-4]; |
if (clipdist < 0 || util_is_inf_or_nan(clipdist)) |
mask |= 1 << plane_idx; |
} else { |
if (dot4(clipvertex, plane[plane_idx]) < 0) |
mask |= 1 << plane_idx; |
} |
} |
} |
|
out->clipmask = mask; |
need_pipeline |= out->clipmask; |
} |
|
/* |
* Transform the vertex position from clip coords to window coords, |
* if the vertex is unclipped. |
*/ |
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; |
} |
#ifdef DEBUG |
/* For debug builds, set the clipped vertex's window coordinate |
* to NaN to help catch potential errors later. |
*/ |
else { |
float zero = 0.0f; |
position[0] = |
position[1] = |
position[2] = |
position[3] = zero / zero; /* MSVC doesn't accept 0.0 / 0.0 */ |
} |
#endif |
|
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; |
} |
|
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#undef FLAGS |
#undef TAG |