src/mesa/drivers/dri/i965/brw_clip.c

   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
  46 #define FRONT_UNFILLED_BIT  0x1
  47 #define BACK_UNFILLED_BIT   0x2
  48
  49
  50 static 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(brw, &c.func);
  64
  65    c.func.single_program_flow = 1;
  66
  67    c.key = *key;
  68    c.need_ff_sync = BRW_IS_IGDNG(brw);
  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    if (BRW_IS_IGDNG(brw))
  76        delta = 3 * REG_SIZE;
  77    else
  78        delta = REG_SIZE;
  79
  80    for (i = 0; i < VERT_RESULT_MAX; i++)
  81       if (c.key.attrs & (1<<i)) {
  82          c.offset[i] = delta;
  83          delta += ATTR_SIZE;
  84       }
  85
  86    c.nr_attrs = brw_count_bits(c.key.attrs);
  87
  88    if (BRW_IS_IGDNG(brw))
  89        c.nr_regs = (c.nr_attrs + 1) / 2 + 3;  /* are vertices packed, or reg-aligned? */
  90    else
  91        c.nr_regs = (c.nr_attrs + 1) / 2 + 1;  /* are vertices packed, or reg-aligned? */
  92
  93    c.nr_bytes = c.nr_regs * REG_SIZE;
  94
  95    c.prog_data.clip_mode = c.key.clip_mode; /* XXX */
  96
  97    /* For some reason the thread is spawned with only 4 channels
  98     * unmasked.
  99     */
 100    brw_set_mask_control(&c.func, BRW_MASK_DISABLE);
 101
 102
 103    /* Would ideally have the option of producing a program which could
 104     * do all three:
 105     */
 106    switch (key->primitive) {
 107    case GL_TRIANGLES:
 108       if (key->do_unfilled)
 109          brw_emit_unfilled_clip( &c );
 110       else
 111          brw_emit_tri_clip( &c );
 112       break;
 113    case GL_LINES:
 114       brw_emit_line_clip( &c );
 115       break;
 116    case GL_POINTS:
 117       brw_emit_point_clip( &c );
 118       break;
 119    default:
 120       assert(0);
 121       return;
 122    }
 123
 124
 125
 126    /* get the program
 127     */
 128    program = brw_get_program(&c.func, &program_size);
 129
 130    /* Upload
 131     */
 132    dri_bo_unreference(brw->clip.prog_bo);
 133    brw->clip.prog_bo = brw_upload_cache( &brw->cache,
 134                                          BRW_CLIP_PROG,
 135                                          &c.key, sizeof(c.key),
 136                                          NULL, 0,
 137                                          program, program_size,
 138                                          &c.prog_data,
 139                                          &brw->clip.prog_data );
 140 }
 141
 142 /* Calculate interpolants for triangle and line rasterization.
 143  */
 144 static void upload_clip_prog(struct brw_context *brw)
 145 {
 146    GLcontext *ctx = &brw->intel.ctx;
 147    struct brw_clip_prog_key key;
 148
 149    memset(&key, 0, sizeof(key));
 150
 151    /* Populate the key:
 152     */
 153    /* BRW_NEW_REDUCED_PRIMITIVE */
 154    key.primitive = brw->intel.reduced_primitive;
 155    /* CACHE_NEW_VS_PROG */
 156    key.attrs = brw->vs.prog_data->outputs_written;
 157    /* _NEW_LIGHT */
 158    key.do_flat_shading = (ctx->Light.ShadeModel == GL_FLAT);
 159    /* _NEW_TRANSFORM */
 160    key.nr_userclip = brw_count_bits(ctx->Transform.ClipPlanesEnabled);
 161
 162    if (BRW_IS_IGDNG(brw))
 163        key.clip_mode = BRW_CLIPMODE_KERNEL_CLIP;
 164    else
 165        key.clip_mode = BRW_CLIPMODE_NORMAL;
 166
 167    /* _NEW_POLYGON */
 168    if (key.primitive == GL_TRIANGLES) {
 169       if (ctx->Polygon.CullFaceMode == GL_FRONT_AND_BACK)
 170          key.clip_mode = BRW_CLIPMODE_REJECT_ALL;
 171       else {
 172          GLuint fill_front = CLIP_CULL;
 173          GLuint fill_back = CLIP_CULL;
 174          GLuint offset_front = 0;
 175          GLuint offset_back = 0;
 176
 177          if (!ctx->Polygon.CullFlag ||
 178              ctx->Polygon.CullFaceMode != GL_FRONT) {
 179             switch (ctx->Polygon.FrontMode) {
 180             case GL_FILL:
 181                fill_front = CLIP_FILL;
 182                offset_front = 0;
 183                break;
 184             case GL_LINE:
 185                fill_front = CLIP_LINE;
 186                offset_front = ctx->Polygon.OffsetLine;
 187                break;
 188             case GL_POINT:
 189                fill_front = CLIP_POINT;
 190                offset_front = ctx->Polygon.OffsetPoint;
 191                break;
 192             }
 193          }
 194
 195          if (!ctx->Polygon.CullFlag ||
 196              ctx->Polygon.CullFaceMode != GL_BACK) {
 197             switch (ctx->Polygon.BackMode) {
 198             case GL_FILL:
 199                fill_back = CLIP_FILL;
 200                offset_back = 0;
 201                break;
 202             case GL_LINE:
 203                fill_back = CLIP_LINE;
 204                offset_back = ctx->Polygon.OffsetLine;
 205                break;
 206             case GL_POINT:
 207                fill_back = CLIP_POINT;
 208                offset_back = ctx->Polygon.OffsetPoint;
 209                break;
 210             }
 211          }
 212
 213          if (ctx->Polygon.BackMode != GL_FILL ||
 214              ctx->Polygon.FrontMode != GL_FILL) {
 215             key.do_unfilled = 1;
 216
 217             /* Most cases the fixed function units will handle.  Cases where
 218              * one or more polygon faces are unfilled will require help:
 219              */
 220             key.clip_mode = BRW_CLIPMODE_CLIP_NON_REJECTED;
 221
 222             if (offset_back || offset_front) {
 223                /* _NEW_POLYGON, _NEW_BUFFERS */
 224                key.offset_units = ctx->Polygon.OffsetUnits * brw->intel.polygon_offset_scale;
 225                key.offset_factor = ctx->Polygon.OffsetFactor * ctx->DrawBuffer->_MRD;
 226             }
 227
 228             switch (ctx->Polygon.FrontFace) {
 229             case GL_CCW:
 230                key.fill_ccw = fill_front;
 231                key.fill_cw = fill_back;
 232                key.offset_ccw = offset_front;
 233                key.offset_cw = offset_back;
 234                if (ctx->Light.Model.TwoSide &&
 235                    key.fill_cw != CLIP_CULL)
 236                   key.copy_bfc_cw = 1;
 237                break;
 238             case GL_CW:
 239                key.fill_cw = fill_front;
 240                key.fill_ccw = fill_back;
 241                key.offset_cw = offset_front;
 242                key.offset_ccw = offset_back;
 243                if (ctx->Light.Model.TwoSide &&
 244                    key.fill_ccw != CLIP_CULL)
 245                   key.copy_bfc_ccw = 1;
 246                break;
 247             }
 248          }
 249       }
 250    }
 251
 252    dri_bo_unreference(brw->clip.prog_bo);
 253    brw->clip.prog_bo = brw_search_cache(&brw->cache, BRW_CLIP_PROG,
 254                                         &key, sizeof(key),
 255                                         NULL, 0,
 256                                         &brw->clip.prog_data);
 257    if (brw->clip.prog_bo == NULL)
 258       compile_clip_prog( brw, &key );
 259 }
 260
 261
 262 const struct brw_tracked_state brw_clip_prog = {
 263    .dirty = {
 264       .mesa  = (_NEW_LIGHT |
 265                 _NEW_TRANSFORM |
 266                 _NEW_POLYGON |
 267                 _NEW_BUFFERS),
 268       .brw   = (BRW_NEW_REDUCED_PRIMITIVE),
 269       .cache = CACHE_NEW_VS_PROG
 270    },
 271    .prepare = upload_clip_prog
 272 };