1 /************************************************************************** 2 * 3 * Copyright 2010, VMware, inc. 4 * All Rights Reserved. 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a 7 * copy of this software and associated documentation files (the 8 * "Software"), to deal in the Software without restriction, including 9 * without limitation the rights to use, copy, modify, merge, publish, 10 * distribute, sub license, and/or sell copies of the Software, and to 11 * permit persons to whom the Software is furnished to do so, subject to 12 * the following conditions: 13 * 14 * The above copyright notice and this permission notice (including the 15 * next paragraph) shall be included in all copies or substantial portions 16 * of the Software. 17 * 18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS 19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. 21 * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR 22 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, 23 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE 24 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 25 * 26 **************************************************************************/ 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 159
