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.CullFlag &&
 170           ctx->Polygon.CullFaceMode == GL_FRONT_AND_BACK)
 171          key.clip_mode = BRW_CLIPMODE_REJECT_ALL;
 172       else {
 173          GLuint fill_front = CLIP_CULL;
 174          GLuint fill_back = CLIP_CULL;
 175          GLuint offset_front = 0;
 176          GLuint offset_back = 0;
 177
 178          if (!ctx->Polygon.CullFlag ||
 179              ctx->Polygon.CullFaceMode != GL_FRONT) {
 180             switch (ctx->Polygon.FrontMode) {
 181             case GL_FILL:
 182                fill_front = CLIP_FILL;
 183                offset_front = 0;
 184                break;
 185             case GL_LINE:
 186                fill_front = CLIP_LINE;
 187                offset_front = ctx->Polygon.OffsetLine;
 188                break;
 189             case GL_POINT:
 190                fill_front = CLIP_POINT;
 191                offset_front = ctx->Polygon.OffsetPoint;
 192                break;
 193             }
 194          }
 195
 196          if (!ctx->Polygon.CullFlag ||
 197              ctx->Polygon.CullFaceMode != GL_BACK) {
 198             switch (ctx->Polygon.BackMode) {
 199             case GL_FILL:
 200                fill_back = CLIP_FILL;
 201                offset_back = 0;
 202                break;
 203             case GL_LINE:
 204                fill_back = CLIP_LINE;
 205                offset_back = ctx->Polygon.OffsetLine;
 206                break;
 207             case GL_POINT:
 208                fill_back = CLIP_POINT;
 209                offset_back = ctx->Polygon.OffsetPoint;
 210                break;
 211             }
 212          }
 213
 214          if (ctx->Polygon.BackMode != GL_FILL ||
 215              ctx->Polygon.FrontMode != GL_FILL) {
 216             key.do_unfilled = 1;
 217
 218             /* Most cases the fixed function units will handle.  Cases where
 219              * one or more polygon faces are unfilled will require help:
 220              */
 221             key.clip_mode = BRW_CLIPMODE_CLIP_NON_REJECTED;
 222
 223             if (offset_back || offset_front) {
 224                /* _NEW_POLYGON, _NEW_BUFFERS */
 225                key.offset_units = ctx->Polygon.OffsetUnits * brw->intel.polygon_offset_scale;
 226                key.offset_factor = ctx->Polygon.OffsetFactor * ctx->DrawBuffer->_MRD;
 227             }
 228
 229             switch (ctx->Polygon.FrontFace) {
 230             case GL_CCW:
 231                key.fill_ccw = fill_front;
 232                key.fill_cw = fill_back;
 233                key.offset_ccw = offset_front;
 234                key.offset_cw = offset_back;
 235                if (ctx->Light.Model.TwoSide &&
 236                    key.fill_cw != CLIP_CULL)
 237                   key.copy_bfc_cw = 1;
 238                break;
 239             case GL_CW:
 240                key.fill_cw = fill_front;
 241                key.fill_ccw = fill_back;
 242                key.offset_cw = offset_front;
 243                key.offset_ccw = offset_back;
 244                if (ctx->Light.Model.TwoSide &&
 245                    key.fill_ccw != CLIP_CULL)
 246                   key.copy_bfc_ccw = 1;
 247                break;
 248             }
 249          }
 250       }
 251    }
 252
 253    dri_bo_unreference(brw->clip.prog_bo);
 254    brw->clip.prog_bo = brw_search_cache(&brw->cache, BRW_CLIP_PROG,
 255                                         &key, sizeof(key),
 256                                         NULL, 0,
 257                                         &brw->clip.prog_data);
 258    if (brw->clip.prog_bo == NULL)
 259       compile_clip_prog( brw, &key );
 260 }
 261
 262
 263 const struct brw_tracked_state brw_clip_prog = {
 264    .dirty = {
 265       .mesa  = (_NEW_LIGHT |
 266                 _NEW_TRANSFORM |
 267                 _NEW_POLYGON |
 268                 _NEW_BUFFERS),
 269       .brw   = (BRW_NEW_REDUCED_PRIMITIVE),
 270       .cache = CACHE_NEW_VS_PROG
 271    },
 272    .prepare = upload_clip_prog
 273 };