/************************************************************************** * * 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; } 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) 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; } #undef FLAGS #undef TAG