forked from KolibriOS/kolibrios
199 lines
7.3 KiB
C
199 lines
7.3 KiB
C
/**************************************************************************
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*
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* Copyright 2010, VMware, inc.
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sub license, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial portions
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* of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
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* IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
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* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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**************************************************************************/
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static boolean TAG(do_cliptest)( struct pt_post_vs *pvs,
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struct draw_vertex_info *info,
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const struct draw_prim_info *prim_info )
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{
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struct vertex_header *out = info->verts;
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/* const */ float (*plane)[4] = pvs->draw->plane;
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const unsigned pos = draw_current_shader_position_output(pvs->draw);
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const unsigned cv = draw_current_shader_clipvertex_output(pvs->draw);
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unsigned cd[2];
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const unsigned ef = pvs->draw->vs.edgeflag_output;
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unsigned ucp_enable = pvs->draw->rasterizer->clip_plane_enable;
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unsigned flags = (FLAGS);
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unsigned need_pipeline = 0;
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unsigned j;
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unsigned i;
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bool have_cd = false;
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unsigned viewport_index_output =
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draw_current_shader_viewport_index_output(pvs->draw);
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int viewport_index =
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draw_current_shader_uses_viewport_index(pvs->draw) ?
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*((unsigned*)out->data[viewport_index_output]): 0;
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int num_written_clipdistance =
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draw_current_shader_num_written_clipdistances(pvs->draw);
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cd[0] = draw_current_shader_clipdistance_output(pvs->draw, 0);
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cd[1] = draw_current_shader_clipdistance_output(pvs->draw, 1);
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if (cd[0] != pos || cd[1] != pos)
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have_cd = true;
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/* If clipdistance semantic has been written by the shader
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* that means we're expected to do 'user plane clipping' */
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if (num_written_clipdistance && !(flags & DO_CLIP_USER)) {
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flags |= DO_CLIP_USER;
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ucp_enable = (1 << num_written_clipdistance) - 1;
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}
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for (j = 0; j < info->count; j++) {
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float *position = out->data[pos];
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unsigned mask = 0x0;
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float *scale = pvs->draw->viewports[0].scale;
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float *trans = pvs->draw->viewports[0].translate;
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if (draw_current_shader_uses_viewport_index(pvs->draw)) {
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unsigned verts_per_prim = u_vertices_per_prim(prim_info->prim);
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/* only change the viewport_index for the leading vertex */
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if (!(j % verts_per_prim)) {
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viewport_index = *((unsigned*)out->data[viewport_index_output]);
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viewport_index = draw_clamp_viewport_idx(viewport_index);
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}
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scale = pvs->draw->viewports[viewport_index].scale;
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trans = pvs->draw->viewports[viewport_index].translate;
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}
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initialize_vertex_header(out);
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if (flags & (DO_CLIP_XY | DO_CLIP_XY_GUARD_BAND |
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DO_CLIP_FULL_Z | DO_CLIP_HALF_Z | DO_CLIP_USER)) {
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float *clipvertex = position;
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if ((flags & DO_CLIP_USER) && cv != pos)
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clipvertex = out->data[cv];
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for (i = 0; i < 4; i++) {
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out->clip[i] = clipvertex[i];
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out->pre_clip_pos[i] = position[i];
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}
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/* Do the hardwired planes first:
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*/
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if (flags & DO_CLIP_XY_GUARD_BAND) {
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if (-0.50 * position[0] + position[3] < 0) mask |= (1<<0);
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if ( 0.50 * position[0] + position[3] < 0) mask |= (1<<1);
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if (-0.50 * position[1] + position[3] < 0) mask |= (1<<2);
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if ( 0.50 * position[1] + position[3] < 0) mask |= (1<<3);
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}
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else if (flags & DO_CLIP_XY) {
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if (-position[0] + position[3] < 0) mask |= (1<<0);
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if ( position[0] + position[3] < 0) mask |= (1<<1);
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if (-position[1] + position[3] < 0) mask |= (1<<2);
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if ( position[1] + position[3] < 0) mask |= (1<<3);
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}
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/* Clip Z planes according to full cube, half cube or none.
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*/
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if (flags & DO_CLIP_FULL_Z) {
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if ( position[2] + position[3] < 0) mask |= (1<<4);
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if (-position[2] + position[3] < 0) mask |= (1<<5);
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}
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else if (flags & DO_CLIP_HALF_Z) {
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if ( position[2] < 0) mask |= (1<<4);
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if (-position[2] + position[3] < 0) mask |= (1<<5);
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}
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if (flags & DO_CLIP_USER) {
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unsigned ucp_mask = ucp_enable;
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while (ucp_mask) {
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unsigned plane_idx = ffs(ucp_mask)-1;
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ucp_mask &= ~(1 << plane_idx);
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plane_idx += 6;
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/*
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* for user clipping check if we have a clip distance output
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* and the shader has written to it, otherwise use clipvertex
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* to decide when the plane is clipping.
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*/
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if (have_cd && num_written_clipdistance) {
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float clipdist;
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i = plane_idx - 6;
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out->have_clipdist = 1;
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/* first four clip distance in first vector etc. */
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if (i < 4)
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clipdist = out->data[cd[0]][i];
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else
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clipdist = out->data[cd[1]][i-4];
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if (clipdist < 0)
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mask |= 1 << plane_idx;
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} else {
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if (dot4(clipvertex, plane[plane_idx]) < 0)
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mask |= 1 << plane_idx;
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}
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}
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}
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out->clipmask = mask;
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need_pipeline |= out->clipmask;
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}
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/*
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* Transform the vertex position from clip coords to window coords,
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* if the vertex is unclipped.
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*/
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if ((flags & DO_VIEWPORT) && mask == 0)
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{
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/* divide by w */
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float w = 1.0f / position[3];
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/* Viewport mapping */
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position[0] = position[0] * w * scale[0] + trans[0];
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position[1] = position[1] * w * scale[1] + trans[1];
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position[2] = position[2] * w * scale[2] + trans[2];
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position[3] = w;
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}
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#ifdef DEBUG
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/* For debug builds, set the clipped vertex's window coordinate
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* to NaN to help catch potential errors later.
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*/
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else {
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float zero = 0.0f;
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position[0] =
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position[1] =
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position[2] =
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position[3] = zero / zero; /* MSVC doesn't accept 0.0 / 0.0 */
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}
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#endif
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if ((flags & DO_EDGEFLAG) && ef) {
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const float *edgeflag = out->data[ef];
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out->edgeflag = !(edgeflag[0] != 1.0f);
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need_pipeline |= !out->edgeflag;
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}
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out = (struct vertex_header *)( (char *)out + info->stride );
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}
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return need_pipeline != 0;
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}
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#undef FLAGS
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#undef TAG
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