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 intel_context *intel = &brw->intel;
  54    struct brw_clip_compile c;
  55    const GLuint *program;
  56    GLuint program_size;
  57    GLuint delta;
  58    GLuint i;
  59
  60    memset(&c, 0, sizeof(c));
  61
  62    /* Begin the compilation:
  63     */
  64    brw_init_compile(brw, &c.func);
  65
  66    c.func.single_program_flow = 1;
  67
  68    c.key = *key;
  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 (intel->is_ironlake)
  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 (intel->is_ironlake)
  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    struct intel_context *intel = &brw->intel;
 147    GLcontext *ctx = &intel->ctx;
 148    struct brw_clip_prog_key key;
 149
 150    memset(&key, 0, sizeof(key));
 151
 152    /* Populate the key:
 153     */
 154    /* BRW_NEW_REDUCED_PRIMITIVE */
 155    key.primitive = brw->intel.reduced_primitive;
 156    /* CACHE_NEW_VS_PROG */
 157    key.attrs = brw->vs.prog_data->outputs_written;
 158    /* _NEW_LIGHT */
 159    key.do_flat_shading = (ctx->Light.ShadeModel == GL_FLAT);
 160    key.pv_first = (ctx->Light.ProvokingVertex == GL_FIRST_VERTEX_CONVENTION);
 161    /* _NEW_TRANSFORM */
 162    key.nr_userclip = brw_count_bits(ctx->Transform.ClipPlanesEnabled);
 163
 164    if (intel->is_ironlake)
 165        key.clip_mode = BRW_CLIPMODE_KERNEL_CLIP;
 166    else
 167        key.clip_mode = BRW_CLIPMODE_NORMAL;
 168
 169    /* _NEW_POLYGON */
 170    if (key.primitive == GL_TRIANGLES) {
 171       if (ctx->Polygon.CullFlag &&
 172           ctx->Polygon.CullFaceMode == GL_FRONT_AND_BACK)
 173          key.clip_mode = BRW_CLIPMODE_REJECT_ALL;
 174       else {
 175          GLuint fill_front = CLIP_CULL;
 176          GLuint fill_back = CLIP_CULL;
 177          GLuint offset_front = 0;
 178          GLuint offset_back = 0;
 179
 180          if (!ctx->Polygon.CullFlag ||
 181              ctx->Polygon.CullFaceMode != GL_FRONT) {
 182             switch (ctx->Polygon.FrontMode) {
 183             case GL_FILL:
 184                fill_front = CLIP_FILL;
 185                offset_front = 0;
 186                break;
 187             case GL_LINE:
 188                fill_front = CLIP_LINE;
 189                offset_front = ctx->Polygon.OffsetLine;
 190                break;
 191             case GL_POINT:
 192                fill_front = CLIP_POINT;
 193                offset_front = ctx->Polygon.OffsetPoint;
 194                break;
 195             }
 196          }
 197
 198          if (!ctx->Polygon.CullFlag ||
 199              ctx->Polygon.CullFaceMode != GL_BACK) {
 200             switch (ctx->Polygon.BackMode) {
 201             case GL_FILL:
 202                fill_back = CLIP_FILL;
 203                offset_back = 0;
 204                break;
 205             case GL_LINE:
 206                fill_back = CLIP_LINE;
 207                offset_back = ctx->Polygon.OffsetLine;
 208                break;
 209             case GL_POINT:
 210                fill_back = CLIP_POINT;
 211                offset_back = ctx->Polygon.OffsetPoint;
 212                break;
 213             }
 214          }
 215
 216          if (ctx->Polygon.BackMode != GL_FILL ||
 217              ctx->Polygon.FrontMode != GL_FILL) {
 218             key.do_unfilled = 1;
 219
 220             /* Most cases the fixed function units will handle.  Cases where
 221              * one or more polygon faces are unfilled will require help:
 222              */
 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 = ctx->Polygon.OffsetUnits * brw->intel.polygon_offset_scale;
 228                key.offset_factor = ctx->Polygon.OffsetFactor * ctx->DrawBuffer->_MRD;
 229             }
 230
 231             switch (ctx->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 (ctx->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 (ctx->Light.Model.TwoSide &&
 247                    key.fill_ccw != CLIP_CULL)
 248                   key.copy_bfc_ccw = 1;
 249                break;
 250             }
 251          }
 252       }
 253    }
 254
 255    dri_bo_unreference(brw->clip.prog_bo);
 256    brw->clip.prog_bo = brw_search_cache(&brw->cache, BRW_CLIP_PROG,
 257                                         &key, sizeof(key),
 258                                         NULL, 0,
 259                                         &brw->clip.prog_data);
 260    if (brw->clip.prog_bo == NULL)
 261       compile_clip_prog( brw, &key );
 262 }
 263
 264
 265 const struct brw_tracked_state brw_clip_prog = {
 266    .dirty = {
 267       .mesa  = (_NEW_LIGHT |
 268                 _NEW_TRANSFORM |
 269                 _NEW_POLYGON |
 270                 _NEW_BUFFERS),
 271       .brw   = (BRW_NEW_REDUCED_PRIMITIVE),
 272       .cache = CACHE_NEW_VS_PROG
 273    },
 274    .prepare = upload_clip_prog
 275 };