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_with_auxdata(&brw->cache,
 134                                                      BRW_CLIP_PROG,
 135                                                      &c.key, sizeof(c.key),
 136                                                      NULL, 0,
 137                                                      program, program_size,
 138                                                      &c.prog_data,
 139                                                      sizeof(c.prog_data),
 140                                                      &brw->clip.prog_data);
 141 }
 142
 143 /* Calculate interpolants for triangle and line rasterization.
 144  */
 145 static void upload_clip_prog(struct brw_context *brw)
 146 {
 147    struct intel_context *intel = &brw->intel;
 148    GLcontext *ctx = &intel->ctx;
 149    struct brw_clip_prog_key key;
 150
 151    memset(&key, 0, sizeof(key));
 152
 153    /* Populate the key:
 154     */
 155    /* BRW_NEW_REDUCED_PRIMITIVE */
 156    key.primitive = brw->intel.reduced_primitive;
 157    /* CACHE_NEW_VS_PROG */
 158    key.attrs = brw->vs.prog_data->outputs_written;
 159    /* _NEW_LIGHT */
 160    key.do_flat_shading = (ctx->Light.ShadeModel == GL_FLAT);
 161    key.pv_first = (ctx->Light.ProvokingVertex == GL_FIRST_VERTEX_CONVENTION);
 162    /* _NEW_TRANSFORM */
 163    key.nr_userclip = brw_count_bits(ctx->Transform.ClipPlanesEnabled);
 164
 165    if (intel->is_ironlake)
 166        key.clip_mode = BRW_CLIPMODE_KERNEL_CLIP;
 167    else
 168        key.clip_mode = BRW_CLIPMODE_NORMAL;
 169
 170    /* _NEW_POLYGON */
 171    if (key.primitive == GL_TRIANGLES) {
 172       if (ctx->Polygon.CullFlag &&
 173           ctx->Polygon.CullFaceMode == GL_FRONT_AND_BACK)
 174          key.clip_mode = BRW_CLIPMODE_REJECT_ALL;
 175       else {
 176          GLuint fill_front = CLIP_CULL;
 177          GLuint fill_back = CLIP_CULL;
 178          GLuint offset_front = 0;
 179          GLuint offset_back = 0;
 180
 181          if (!ctx->Polygon.CullFlag ||
 182              ctx->Polygon.CullFaceMode != GL_FRONT) {
 183             switch (ctx->Polygon.FrontMode) {
 184             case GL_FILL:
 185                fill_front = CLIP_FILL;
 186                offset_front = 0;
 187                break;
 188             case GL_LINE:
 189                fill_front = CLIP_LINE;
 190                offset_front = ctx->Polygon.OffsetLine;
 191                break;
 192             case GL_POINT:
 193                fill_front = CLIP_POINT;
 194                offset_front = ctx->Polygon.OffsetPoint;
 195                break;
 196             }
 197          }
 198
 199          if (!ctx->Polygon.CullFlag ||
 200              ctx->Polygon.CullFaceMode != GL_BACK) {
 201             switch (ctx->Polygon.BackMode) {
 202             case GL_FILL:
 203                fill_back = CLIP_FILL;
 204                offset_back = 0;
 205                break;
 206             case GL_LINE:
 207                fill_back = CLIP_LINE;
 208                offset_back = ctx->Polygon.OffsetLine;
 209                break;
 210             case GL_POINT:
 211                fill_back = CLIP_POINT;
 212                offset_back = ctx->Polygon.OffsetPoint;
 213                break;
 214             }
 215          }
 216
 217          if (ctx->Polygon.BackMode != GL_FILL ||
 218              ctx->Polygon.FrontMode != GL_FILL) {
 219             key.do_unfilled = 1;
 220
 221             /* Most cases the fixed function units will handle.  Cases where
 222              * one or more polygon faces are unfilled will require help:
 223              */
 224             key.clip_mode = BRW_CLIPMODE_CLIP_NON_REJECTED;
 225
 226             if (offset_back || offset_front) {
 227                /* _NEW_POLYGON, _NEW_BUFFERS */
 228                key.offset_units = ctx->Polygon.OffsetUnits * brw->intel.polygon_offset_scale;
 229                key.offset_factor = ctx->Polygon.OffsetFactor * ctx->DrawBuffer->_MRD;
 230             }
 231
 232             switch (ctx->Polygon.FrontFace) {
 233             case GL_CCW:
 234                key.fill_ccw = fill_front;
 235                key.fill_cw = fill_back;
 236                key.offset_ccw = offset_front;
 237                key.offset_cw = offset_back;
 238                if (ctx->Light.Model.TwoSide &&
 239                    key.fill_cw != CLIP_CULL)
 240                   key.copy_bfc_cw = 1;
 241                break;
 242             case GL_CW:
 243                key.fill_cw = fill_front;
 244                key.fill_ccw = fill_back;
 245                key.offset_cw = offset_front;
 246                key.offset_ccw = offset_back;
 247                if (ctx->Light.Model.TwoSide &&
 248                    key.fill_ccw != CLIP_CULL)
 249                   key.copy_bfc_ccw = 1;
 250                break;
 251             }
 252          }
 253       }
 254    }
 255
 256    dri_bo_unreference(brw->clip.prog_bo);
 257    brw->clip.prog_bo = brw_search_cache(&brw->cache, BRW_CLIP_PROG,
 258                                         &key, sizeof(key),
 259                                         NULL, 0,
 260                                         &brw->clip.prog_data);
 261    if (brw->clip.prog_bo == NULL)
 262       compile_clip_prog( brw, &key );
 263 }
 264
 265
 266 const struct brw_tracked_state brw_clip_prog = {
 267    .dirty = {
 268       .mesa  = (_NEW_LIGHT |
 269                 _NEW_TRANSFORM |
 270                 _NEW_POLYGON |
 271                 _NEW_BUFFERS),
 272       .brw   = (BRW_NEW_REDUCED_PRIMITIVE),
 273       .cache = CACHE_NEW_VS_PROG
 274    },
 275    .prepare = upload_clip_prog
 276 };