brw_clip.c revision 125bd4cae51c6deaacd2e90f14931c2052f146ab
1/* 2 Copyright (C) Intel Corp. 2006. All Rights Reserved. 3 Intel funded Tungsten Graphics (http://www.tungstengraphics.com) to 4 develop this 3D driver. 5 6 Permission is hereby granted, free of charge, to any person obtaining 7 a 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, sublicense, 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 16 portions of the Software. 17 18 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 19 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 20 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 21 IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE 22 LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION 23 OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION 24 WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 25 26 **********************************************************************/ 27 /* 28 * Authors: 29 * Keith Whitwell <keith@tungstengraphics.com> 30 */ 31 32#include "glheader.h" 33#include "macros.h" 34#include "enums.h" 35 36#include "intel_batchbuffer.h" 37 38#include "brw_defines.h" 39#include "brw_context.h" 40#include "brw_eu.h" 41#include "brw_util.h" 42#include "brw_state.h" 43#include "brw_clip.h" 44 45 46#define FRONT_UNFILLED_BIT 0x1 47#define BACK_UNFILLED_BIT 0x2 48 49 50static void compile_clip_prog( struct brw_context *brw, 51 struct brw_clip_prog_key *key ) 52{ 53 struct brw_clip_compile c; 54 const GLuint *program; 55 GLuint program_size; 56 GLuint delta; 57 GLuint i; 58 59 memset(&c, 0, sizeof(c)); 60 61 /* Begin the compilation: 62 */ 63 brw_init_compile(&c.func); 64 65 c.func.single_program_flow = 1; 66 67 c.key = *key; 68 69 70 /* Need to locate the two positions present in vertex + header. 71 * These are currently hardcoded: 72 */ 73 c.header_position_offset = ATTR_SIZE; 74 75 for (i = 0, delta = REG_SIZE; i < VERT_RESULT_MAX; i++) 76 if (c.key.attrs & (1<<i)) { 77 c.offset[i] = delta; 78 delta += ATTR_SIZE; 79 } 80 81 c.nr_attrs = brw_count_bits(c.key.attrs); 82 c.nr_regs = (c.nr_attrs + 1) / 2 + 1; /* are vertices packed, or reg-aligned? */ 83 c.nr_bytes = c.nr_regs * REG_SIZE; 84 85 c.prog_data.clip_mode = c.key.clip_mode; /* XXX */ 86 87 /* For some reason the thread is spawned with only 4 channels 88 * unmasked. 89 */ 90 brw_set_mask_control(&c.func, BRW_MASK_DISABLE); 91 92 93 /* Would ideally have the option of producing a program which could 94 * do all three: 95 */ 96 switch (key->primitive) { 97 case GL_TRIANGLES: 98 if (key->do_unfilled) 99 brw_emit_unfilled_clip( &c ); 100 else 101 brw_emit_tri_clip( &c ); 102 break; 103 case GL_LINES: 104 brw_emit_line_clip( &c ); 105 break; 106 case GL_POINTS: 107 brw_emit_point_clip( &c ); 108 break; 109 default: 110 assert(0); 111 return; 112 } 113 114 115 116 /* get the program 117 */ 118 program = brw_get_program(&c.func, &program_size); 119 120 /* Upload 121 */ 122 brw->clip.prog_gs_offset = brw_upload_cache( &brw->cache[BRW_CLIP_PROG], 123 &c.key, 124 sizeof(c.key), 125 program, 126 program_size, 127 &c.prog_data, 128 &brw->clip.prog_data ); 129} 130 131 132static GLboolean search_cache( struct brw_context *brw, 133 struct brw_clip_prog_key *key ) 134{ 135 return brw_search_cache(&brw->cache[BRW_CLIP_PROG], 136 key, sizeof(*key), 137 &brw->clip.prog_data, 138 &brw->clip.prog_gs_offset); 139} 140 141 142 143 144/* Calculate interpolants for triangle and line rasterization. 145 */ 146static void upload_clip_prog( struct brw_context *brw ) 147{ 148 GLcontext *ctx = &brw->intel.ctx; 149 struct brw_clip_prog_key key; 150 151 memset(&key, 0, sizeof(key)); 152 153 /* Populate the key: 154 */ 155 /* BRW_NEW_REDUCED_PRIMITIVE */ 156 key.primitive = brw->intel.reduced_primitive; 157 /* CACHE_NEW_VS_PROG */ 158 key.attrs = brw->vs.prog_data->outputs_written; 159 /* _NEW_LIGHT */ 160 key.do_flat_shading = (brw->attribs.Light->ShadeModel == GL_FLAT); 161 /* _NEW_TRANSFORM */ 162 key.nr_userclip = brw_count_bits(brw->attribs.Transform->ClipPlanesEnabled); 163 key.clip_mode = BRW_CLIPMODE_NORMAL; 164 165 /* _NEW_POLYGON */ 166 if (key.primitive == GL_TRIANGLES) { 167 if (brw->attribs.Polygon->CullFaceMode == GL_FRONT_AND_BACK) 168 key.clip_mode = BRW_CLIPMODE_REJECT_ALL; 169 else { 170 GLuint fill_front = CLIP_CULL; 171 GLuint fill_back = CLIP_CULL; 172 GLuint offset_front = 0; 173 GLuint offset_back = 0; 174 175 if (!brw->attribs.Polygon->CullFlag || 176 brw->attribs.Polygon->CullFaceMode != GL_FRONT) { 177 switch (brw->attribs.Polygon->FrontMode) { 178 case GL_FILL: 179 fill_front = CLIP_FILL; 180 offset_front = 0; 181 break; 182 case GL_LINE: 183 key.do_unfilled = 1; 184 fill_front = CLIP_LINE; 185 offset_front = brw->attribs.Polygon->OffsetLine; 186 break; 187 case GL_POINT: 188 key.do_unfilled = 1; 189 fill_front = CLIP_POINT; 190 offset_front = brw->attribs.Polygon->OffsetPoint; 191 break; 192 } 193 } 194 195 if (!brw->attribs.Polygon->CullFlag || 196 brw->attribs.Polygon->CullFaceMode != GL_BACK) { 197 switch (brw->attribs.Polygon->BackMode) { 198 case GL_FILL: 199 fill_back = CLIP_FILL; 200 offset_back = 0; 201 break; 202 case GL_LINE: 203 key.do_unfilled = 1; 204 fill_back = CLIP_LINE; 205 offset_back = brw->attribs.Polygon->OffsetLine; 206 break; 207 case GL_POINT: 208 key.do_unfilled = 1; 209 fill_back = CLIP_POINT; 210 offset_back = brw->attribs.Polygon->OffsetPoint; 211 break; 212 } 213 } 214 215 if (brw->attribs.Polygon->BackMode != GL_FILL || 216 brw->attribs.Polygon->FrontMode != GL_FILL) 217 key.do_unfilled = 1; 218 219 /* Most cases the fixed function units will handle. Cases where 220 * one or more polygon faces are unfilled will require help: 221 */ 222 if (key.do_unfilled) { 223 key.clip_mode = BRW_CLIPMODE_CLIP_NON_REJECTED; 224 225 if (offset_back || offset_front) { 226 /* _NEW_POLYGON, _NEW_BUFFERS */ 227 key.offset_units = brw->attribs.Polygon->OffsetUnits * brw->intel.polygon_offset_scale; 228 key.offset_factor = brw->attribs.Polygon->OffsetFactor * ctx->DrawBuffer->_MRD; 229 } 230 231 switch (brw->attribs.Polygon->FrontFace) { 232 case GL_CCW: 233 key.fill_ccw = fill_front; 234 key.fill_cw = fill_back; 235 key.offset_ccw = offset_front; 236 key.offset_cw = offset_back; 237 if (brw->attribs.Light->Model.TwoSide && 238 key.fill_cw != CLIP_CULL) 239 key.copy_bfc_cw = 1; 240 break; 241 case GL_CW: 242 key.fill_cw = fill_front; 243 key.fill_ccw = fill_back; 244 key.offset_cw = offset_front; 245 key.offset_ccw = offset_back; 246 if (brw->attribs.Light->Model.TwoSide && 247 key.fill_ccw != CLIP_CULL) 248 key.copy_bfc_ccw = 1; 249 break; 250 } 251 } 252 } 253 } 254 255 if (!search_cache(brw, &key)) 256 compile_clip_prog( brw, &key ); 257} 258 259 260const struct brw_tracked_state brw_clip_prog = { 261 .dirty = { 262 .mesa = (_NEW_LIGHT | 263 _NEW_TRANSFORM | 264 _NEW_POLYGON | 265 _NEW_BUFFERS), 266 .brw = (BRW_NEW_REDUCED_PRIMITIVE), 267 .cache = CACHE_NEW_VS_PROG 268 }, 269 .update = upload_clip_prog 270}; 271