draw_cliptest_tmp.h revision 4465efc3bf8d755a9afb7a4bb5382e2f5bf113e1
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 30static 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 ef = pvs->draw->vs.edgeflag_output; 39 const unsigned nr = pvs->draw->nr_planes; 40 const unsigned flags = (FLAGS); 41 unsigned need_pipeline = 0; 42 unsigned j; 43 44 for (j = 0; j < info->count; j++) { 45 float *position = out->data[pos]; 46 unsigned mask = 0x0; 47 48 initialize_vertex_header(out); 49 50 if (flags & (DO_CLIP_XY | DO_CLIP_XY_GUARD_BAND | 51 DO_CLIP_FULL_Z | DO_CLIP_HALF_Z | DO_CLIP_USER)) { 52 out->clip[0] = position[0]; 53 out->clip[1] = position[1]; 54 out->clip[2] = position[2]; 55 out->clip[3] = position[3]; 56 57 /* Do the hardwired planes first: 58 */ 59 if (flags & DO_CLIP_XY_GUARD_BAND) { 60 if (-0.50 * position[0] + position[3] < 0) mask |= (1<<0); 61 if ( 0.50 * position[0] + position[3] < 0) mask |= (1<<1); 62 if (-0.50 * position[1] + position[3] < 0) mask |= (1<<2); 63 if ( 0.50 * position[1] + position[3] < 0) mask |= (1<<3); 64 } 65 else if (flags & DO_CLIP_XY) { 66 if (-position[0] + position[3] < 0) mask |= (1<<0); 67 if ( position[0] + position[3] < 0) mask |= (1<<1); 68 if (-position[1] + position[3] < 0) mask |= (1<<2); 69 if ( position[1] + position[3] < 0) mask |= (1<<3); 70 } 71 72 /* Clip Z planes according to full cube, half cube or none. 73 */ 74 if (flags & DO_CLIP_FULL_Z) { 75 if ( position[2] + position[3] < 0) mask |= (1<<4); 76 if (-position[2] + position[3] < 0) mask |= (1<<5); 77 } 78 else if (flags & DO_CLIP_HALF_Z) { 79 if ( position[2] < 0) mask |= (1<<4); 80 if (-position[2] + position[3] < 0) mask |= (1<<5); 81 } 82 83 if (flags & DO_CLIP_USER) { 84 unsigned i; 85 for (i = 6; i < nr; i++) { 86 if (dot4(position, plane[i]) < 0) 87 mask |= (1<<i); 88 } 89 } 90 91 out->clipmask = mask; 92 need_pipeline |= out->clipmask; 93 } 94 95 if ((flags & DO_VIEWPORT) && mask == 0) 96 { 97 /* divide by w */ 98 float w = 1.0f / position[3]; 99 100 /* Viewport mapping */ 101 position[0] = position[0] * w * scale[0] + trans[0]; 102 position[1] = position[1] * w * scale[1] + trans[1]; 103 position[2] = position[2] * w * scale[2] + trans[2]; 104 position[3] = w; 105 } 106 107 if ((flags & DO_EDGEFLAG) && ef) { 108 const float *edgeflag = out->data[ef]; 109 out->edgeflag = !(edgeflag[0] != 1.0f); 110 need_pipeline |= !out->edgeflag; 111 } 112 113 out = (struct vertex_header *)( (char *)out + info->stride ); 114 } 115 116 return need_pipeline != 0; 117} 118 119 120#undef FLAGS 121#undef TAG 122