brw_clip.c revision 78be5bcb222d379a07979de98ff5b9e3549de6a7
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 "main/glheader.h" 33#include "main/macros.h" 34#include "main/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#include "glsl/ralloc.h" 46 47#define FRONT_UNFILLED_BIT 0x1 48#define BACK_UNFILLED_BIT 0x2 49 50 51static void compile_clip_prog( struct brw_context *brw, 52 struct brw_clip_prog_key *key ) 53{ 54 struct intel_context *intel = &brw->intel; 55 struct brw_clip_compile c; 56 const GLuint *program; 57 void *mem_ctx; 58 GLuint program_size; 59 GLuint i; 60 61 memset(&c, 0, sizeof(c)); 62 63 mem_ctx = ralloc_context(NULL); 64 65 /* Begin the compilation: 66 */ 67 brw_init_compile(brw, &c.func, mem_ctx); 68 69 c.func.single_program_flow = 1; 70 71 c.key = *key; 72 brw_compute_vue_map(&c.vue_map, intel, c.key.nr_userclip, 73 c.key.do_twoside_color, c.key.attrs); 74 75 /* nr_regs is the number of registers filled by reading data from the VUE. 76 * This program accesses the entire VUE, so nr_regs needs to be the size of 77 * the VUE (measured in pairs, since two slots are stored in each 78 * register). 79 */ 80 c.nr_regs = (c.vue_map.num_slots + 1)/2; 81 82 c.prog_data.clip_mode = c.key.clip_mode; /* XXX */ 83 84 /* For some reason the thread is spawned with only 4 channels 85 * unmasked. 86 */ 87 brw_set_mask_control(&c.func, BRW_MASK_DISABLE); 88 89 90 /* Would ideally have the option of producing a program which could 91 * do all three: 92 */ 93 switch (key->primitive) { 94 case GL_TRIANGLES: 95 if (key->do_unfilled) 96 brw_emit_unfilled_clip( &c ); 97 else 98 brw_emit_tri_clip( &c ); 99 break; 100 case GL_LINES: 101 brw_emit_line_clip( &c ); 102 break; 103 case GL_POINTS: 104 brw_emit_point_clip( &c ); 105 break; 106 default: 107 assert(0); 108 return; 109 } 110 111 112 113 /* get the program 114 */ 115 program = brw_get_program(&c.func, &program_size); 116 117 if (unlikely(INTEL_DEBUG & DEBUG_CLIP)) { 118 printf("clip:\n"); 119 for (i = 0; i < program_size / sizeof(struct brw_instruction); i++) 120 brw_disasm(stdout, &((struct brw_instruction *)program)[i], 121 intel->gen); 122 printf("\n"); 123 } 124 125 brw_upload_cache(&brw->cache, 126 BRW_CLIP_PROG, 127 &c.key, sizeof(c.key), 128 program, program_size, 129 &c.prog_data, sizeof(c.prog_data), 130 &brw->clip.prog_offset, &brw->clip.prog_data); 131 ralloc_free(mem_ctx); 132} 133 134/* Calculate interpolants for triangle and line rasterization. 135 */ 136static void upload_clip_prog(struct brw_context *brw) 137{ 138 struct intel_context *intel = &brw->intel; 139 struct gl_context *ctx = &intel->ctx; 140 struct brw_clip_prog_key key; 141 142 memset(&key, 0, sizeof(key)); 143 144 /* Populate the key: 145 */ 146 /* BRW_NEW_REDUCED_PRIMITIVE */ 147 key.primitive = brw->intel.reduced_primitive; 148 /* CACHE_NEW_VS_PROG */ 149 key.attrs = brw->vs.prog_data->outputs_written; 150 /* _NEW_LIGHT */ 151 key.do_flat_shading = (ctx->Light.ShadeModel == GL_FLAT); 152 key.pv_first = (ctx->Light.ProvokingVertex == GL_FIRST_VERTEX_CONVENTION); 153 key.do_twoside_color = (ctx->Light.Enabled && ctx->Light.Model.TwoSide); 154 /* _NEW_TRANSFORM */ 155 key.nr_userclip = brw_count_bits(ctx->Transform.ClipPlanesEnabled); 156 157 if (intel->gen == 5) 158 key.clip_mode = BRW_CLIPMODE_KERNEL_CLIP; 159 else 160 key.clip_mode = BRW_CLIPMODE_NORMAL; 161 162 /* _NEW_POLYGON */ 163 if (key.primitive == GL_TRIANGLES) { 164 if (ctx->Polygon.CullFlag && 165 ctx->Polygon.CullFaceMode == GL_FRONT_AND_BACK) 166 key.clip_mode = BRW_CLIPMODE_REJECT_ALL; 167 else { 168 GLuint fill_front = CLIP_CULL; 169 GLuint fill_back = CLIP_CULL; 170 GLuint offset_front = 0; 171 GLuint offset_back = 0; 172 173 if (!ctx->Polygon.CullFlag || 174 ctx->Polygon.CullFaceMode != GL_FRONT) { 175 switch (ctx->Polygon.FrontMode) { 176 case GL_FILL: 177 fill_front = CLIP_FILL; 178 offset_front = 0; 179 break; 180 case GL_LINE: 181 fill_front = CLIP_LINE; 182 offset_front = ctx->Polygon.OffsetLine; 183 break; 184 case GL_POINT: 185 fill_front = CLIP_POINT; 186 offset_front = ctx->Polygon.OffsetPoint; 187 break; 188 } 189 } 190 191 if (!ctx->Polygon.CullFlag || 192 ctx->Polygon.CullFaceMode != GL_BACK) { 193 switch (ctx->Polygon.BackMode) { 194 case GL_FILL: 195 fill_back = CLIP_FILL; 196 offset_back = 0; 197 break; 198 case GL_LINE: 199 fill_back = CLIP_LINE; 200 offset_back = ctx->Polygon.OffsetLine; 201 break; 202 case GL_POINT: 203 fill_back = CLIP_POINT; 204 offset_back = ctx->Polygon.OffsetPoint; 205 break; 206 } 207 } 208 209 if (ctx->Polygon.BackMode != GL_FILL || 210 ctx->Polygon.FrontMode != GL_FILL) { 211 key.do_unfilled = 1; 212 213 /* Most cases the fixed function units will handle. Cases where 214 * one or more polygon faces are unfilled will require help: 215 */ 216 key.clip_mode = BRW_CLIPMODE_CLIP_NON_REJECTED; 217 218 if (offset_back || offset_front) { 219 /* _NEW_POLYGON, _NEW_BUFFERS */ 220 key.offset_units = ctx->Polygon.OffsetUnits * brw->intel.polygon_offset_scale; 221 key.offset_factor = ctx->Polygon.OffsetFactor * ctx->DrawBuffer->_MRD; 222 } 223 224 switch (ctx->Polygon.FrontFace) { 225 case GL_CCW: 226 key.fill_ccw = fill_front; 227 key.fill_cw = fill_back; 228 key.offset_ccw = offset_front; 229 key.offset_cw = offset_back; 230 if (ctx->Light.Model.TwoSide && 231 key.fill_cw != CLIP_CULL) 232 key.copy_bfc_cw = 1; 233 break; 234 case GL_CW: 235 key.fill_cw = fill_front; 236 key.fill_ccw = fill_back; 237 key.offset_cw = offset_front; 238 key.offset_ccw = offset_back; 239 if (ctx->Light.Model.TwoSide && 240 key.fill_ccw != CLIP_CULL) 241 key.copy_bfc_ccw = 1; 242 break; 243 } 244 } 245 } 246 } 247 248 if (!brw_search_cache(&brw->cache, BRW_CLIP_PROG, 249 &key, sizeof(key), 250 &brw->clip.prog_offset, &brw->clip.prog_data)) { 251 compile_clip_prog( brw, &key ); 252 } 253} 254 255 256const struct brw_tracked_state brw_clip_prog = { 257 .dirty = { 258 .mesa = (_NEW_LIGHT | 259 _NEW_TRANSFORM | 260 _NEW_POLYGON | 261 _NEW_BUFFERS), 262 .brw = (BRW_NEW_REDUCED_PRIMITIVE), 263 .cache = CACHE_NEW_VS_PROG 264 }, 265 .prepare = upload_clip_prog 266}; 267