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 & BITFIELD64_BIT(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    key.pv_first = (ctx->Light.ProvokingVertex == GL_FIRST_VERTEX_CONVENTION);
 160    /* _NEW_TRANSFORM */
 161    key.nr_userclip = brw_count_bits(ctx->Transform.ClipPlanesEnabled);
 162
 163    if (BRW_IS_IGDNG(brw))
 164        key.clip_mode = BRW_CLIPMODE_KERNEL_CLIP;
 165    else
 166        key.clip_mode = BRW_CLIPMODE_NORMAL;
 167
 168    /* _NEW_POLYGON */
 169    if (key.primitive == GL_TRIANGLES) {
 170       if (ctx->Polygon.CullFlag &&
 171           ctx->Polygon.CullFaceMode == GL_FRONT_AND_BACK)
 172          key.clip_mode = BRW_CLIPMODE_REJECT_ALL;
 173       else {
 174          GLuint fill_front = CLIP_CULL;
 175          GLuint fill_back = CLIP_CULL;
 176          GLuint offset_front = 0;
 177          GLuint offset_back = 0;
 178
 179          if (!ctx->Polygon.CullFlag ||
 180              ctx->Polygon.CullFaceMode != GL_FRONT) {
 181             switch (ctx->Polygon.FrontMode) {
 182             case GL_FILL:
 183                fill_front = CLIP_FILL;
 184                offset_front = 0;
 185                break;
 186             case GL_LINE:
 187                fill_front = CLIP_LINE;
 188                offset_front = ctx->Polygon.OffsetLine;
 189                break;
 190             case GL_POINT:
 191                fill_front = CLIP_POINT;
 192                offset_front = ctx->Polygon.OffsetPoint;
 193                break;
 194             }
 195          }
 196
 197          if (!ctx->Polygon.CullFlag ||
 198              ctx->Polygon.CullFaceMode != GL_BACK) {
 199             switch (ctx->Polygon.BackMode) {
 200             case GL_FILL:
 201                fill_back = CLIP_FILL;
 202                offset_back = 0;
 203                break;
 204             case GL_LINE:
 205                fill_back = CLIP_LINE;
 206                offset_back = ctx->Polygon.OffsetLine;
 207                break;
 208             case GL_POINT:
 209                fill_back = CLIP_POINT;
 210                offset_back = ctx->Polygon.OffsetPoint;
 211                break;
 212             }
 213          }
 214
 215          if (ctx->Polygon.BackMode != GL_FILL ||
 216              ctx->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             key.clip_mode = BRW_CLIPMODE_CLIP_NON_REJECTED;
 223
 224             if (offset_back || offset_front) {
 225                /* _NEW_POLYGON, _NEW_BUFFERS */
 226                key.offset_units = ctx->Polygon.OffsetUnits * brw->intel.polygon_offset_scale;
 227                key.offset_factor = ctx->Polygon.OffsetFactor * ctx->DrawBuffer->_MRD;
 228             }
 229
 230             switch (ctx->Polygon.FrontFace) {
 231             case GL_CCW:
 232                key.fill_ccw = fill_front;
 233                key.fill_cw = fill_back;
 234                key.offset_ccw = offset_front;
 235                key.offset_cw = offset_back;
 236                if (ctx->Light.Model.TwoSide &&
 237                    key.fill_cw != CLIP_CULL)
 238                   key.copy_bfc_cw = 1;
 239                break;
 240             case GL_CW:
 241                key.fill_cw = fill_front;
 242                key.fill_ccw = fill_back;
 243                key.offset_cw = offset_front;
 244                key.offset_ccw = offset_back;
 245                if (ctx->Light.Model.TwoSide &&
 246                    key.fill_ccw != CLIP_CULL)
 247                   key.copy_bfc_ccw = 1;
 248                break;
 249             }
 250          }
 251       }
 252    }
 253
 254    dri_bo_unreference(brw->clip.prog_bo);
 255    brw->clip.prog_bo = brw_search_cache(&brw->cache, BRW_CLIP_PROG,
 256                                         &key, sizeof(key),
 257                                         NULL, 0,
 258                                         &brw->clip.prog_data);
 259    if (brw->clip.prog_bo == NULL)
 260       compile_clip_prog( brw, &key );
 261 }
 262
 263
 264 const struct brw_tracked_state brw_clip_prog = {
 265    .dirty = {
 266       .mesa  = (_NEW_LIGHT |
 267                 _NEW_TRANSFORM |
 268                 _NEW_POLYGON |
 269                 _NEW_BUFFERS),
 270       .brw   = (BRW_NEW_REDUCED_PRIMITIVE),
 271       .cache = CACHE_NEW_VS_PROG
 272    },
 273    .prepare = upload_clip_prog
 274 };