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 #define FRONT_UNFILLED_BIT  0x1
  46 #define BACK_UNFILLED_BIT   0x2
  47
  48
  49 static void compile_clip_prog( struct brw_context *brw,
  50                              struct brw_clip_prog_key *key )
  51 {
  52    struct intel_context *intel = &brw->intel;
  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
  69    /* Need to locate the two positions present in vertex + header.
  70     * These are currently hardcoded:
  71     */
  72    c.header_position_offset = ATTR_SIZE;
  73
  74    if (intel->gen == 5)
  75        delta = 3 * REG_SIZE;
  76    else
  77        delta = REG_SIZE;
  78
  79    for (i = 0; i < VERT_RESULT_MAX; i++)
  80       if (c.key.attrs & BITFIELD64_BIT(i)) {
  81          c.offset[i] = delta;
  82          delta += ATTR_SIZE;
  83       }
  84
  85    c.nr_attrs = brw_count_bits(c.key.attrs);
  86
  87    if (intel->gen == 5)
  88        c.nr_regs = (c.nr_attrs + 1) / 2 + 3;  /* are vertices packed, or reg-aligned? */
  89    else
  90        c.nr_regs = (c.nr_attrs + 1) / 2 + 1;  /* are vertices packed, or reg-aligned? */
  91
  92    c.nr_bytes = c.nr_regs * REG_SIZE;
  93
  94    c.prog_data.clip_mode = c.key.clip_mode; /* XXX */
  95
  96    /* For some reason the thread is spawned with only 4 channels
  97     * unmasked.
  98     */
  99    brw_set_mask_control(&c.func, BRW_MASK_DISABLE);
 100
 101
 102    /* Would ideally have the option of producing a program which could
 103     * do all three:
 104     */
 105    switch (key->primitive) {
 106    case GL_TRIANGLES:
 107       if (key->do_unfilled)
 108          brw_emit_unfilled_clip( &c );
 109       else
 110          brw_emit_tri_clip( &c );
 111       break;
 112    case GL_LINES:
 113       brw_emit_line_clip( &c );
 114       break;
 115    case GL_POINTS:
 116       brw_emit_point_clip( &c );
 117       break;
 118    default:
 119       assert(0);
 120       return;
 121    }
 122
 123
 124
 125    /* get the program
 126     */
 127    program = brw_get_program(&c.func, &program_size);
 128
 129     if (INTEL_DEBUG & DEBUG_CLIP) {
 130       printf("clip:\n");
 131       for (i = 0; i < program_size / sizeof(struct brw_instruction); i++)
 132          brw_disasm(stdout, &((struct brw_instruction *)program)[i]);
 133       printf("\n");
 134     }
 135
 136    /* Upload
 137     */
 138    dri_bo_unreference(brw->clip.prog_bo);
 139    brw->clip.prog_bo = brw_upload_cache_with_auxdata(&brw->cache,
 140                                                      BRW_CLIP_PROG,
 141                                                      &c.key, sizeof(c.key),
 142                                                      NULL, 0,
 143                                                      program, program_size,
 144                                                      &c.prog_data,
 145                                                      sizeof(c.prog_data),
 146                                                      &brw->clip.prog_data);
 147 }
 148
 149 /* Calculate interpolants for triangle and line rasterization.
 150  */
 151 static void upload_clip_prog(struct brw_context *brw)
 152 {
 153    struct intel_context *intel = &brw->intel;
 154    GLcontext *ctx = &intel->ctx;
 155    struct brw_clip_prog_key key;
 156
 157    memset(&key, 0, sizeof(key));
 158
 159    /* Populate the key:
 160     */
 161    /* BRW_NEW_REDUCED_PRIMITIVE */
 162    key.primitive = brw->intel.reduced_primitive;
 163    /* CACHE_NEW_VS_PROG */
 164    key.attrs = brw->vs.prog_data->outputs_written;
 165    /* _NEW_LIGHT */
 166    key.do_flat_shading = (ctx->Light.ShadeModel == GL_FLAT);
 167    key.pv_first = (ctx->Light.ProvokingVertex == GL_FIRST_VERTEX_CONVENTION);
 168    /* _NEW_TRANSFORM */
 169    key.nr_userclip = brw_count_bits(ctx->Transform.ClipPlanesEnabled);
 170
 171    if (intel->gen == 5)
 172        key.clip_mode = BRW_CLIPMODE_KERNEL_CLIP;
 173    else
 174        key.clip_mode = BRW_CLIPMODE_NORMAL;
 175
 176    /* _NEW_POLYGON */
 177    if (key.primitive == GL_TRIANGLES) {
 178       if (ctx->Polygon.CullFlag &&
 179           ctx->Polygon.CullFaceMode == GL_FRONT_AND_BACK)
 180          key.clip_mode = BRW_CLIPMODE_REJECT_ALL;
 181       else {
 182          GLuint fill_front = CLIP_CULL;
 183          GLuint fill_back = CLIP_CULL;
 184          GLuint offset_front = 0;
 185          GLuint offset_back = 0;
 186
 187          if (!ctx->Polygon.CullFlag ||
 188              ctx->Polygon.CullFaceMode != GL_FRONT) {
 189             switch (ctx->Polygon.FrontMode) {
 190             case GL_FILL:
 191                fill_front = CLIP_FILL;
 192                offset_front = 0;
 193                break;
 194             case GL_LINE:
 195                fill_front = CLIP_LINE;
 196                offset_front = ctx->Polygon.OffsetLine;
 197                break;
 198             case GL_POINT:
 199                fill_front = CLIP_POINT;
 200                offset_front = ctx->Polygon.OffsetPoint;
 201                break;
 202             }
 203          }
 204
 205          if (!ctx->Polygon.CullFlag ||
 206              ctx->Polygon.CullFaceMode != GL_BACK) {
 207             switch (ctx->Polygon.BackMode) {
 208             case GL_FILL:
 209                fill_back = CLIP_FILL;
 210                offset_back = 0;
 211                break;
 212             case GL_LINE:
 213                fill_back = CLIP_LINE;
 214                offset_back = ctx->Polygon.OffsetLine;
 215                break;
 216             case GL_POINT:
 217                fill_back = CLIP_POINT;
 218                offset_back = ctx->Polygon.OffsetPoint;
 219                break;
 220             }
 221          }
 222
 223          if (ctx->Polygon.BackMode != GL_FILL ||
 224              ctx->Polygon.FrontMode != GL_FILL) {
 225             key.do_unfilled = 1;
 226
 227             /* Most cases the fixed function units will handle.  Cases where
 228              * one or more polygon faces are unfilled will require help:
 229              */
 230             key.clip_mode = BRW_CLIPMODE_CLIP_NON_REJECTED;
 231
 232             if (offset_back || offset_front) {
 233                /* _NEW_POLYGON, _NEW_BUFFERS */
 234                key.offset_units = ctx->Polygon.OffsetUnits * brw->intel.polygon_offset_scale;
 235                key.offset_factor = ctx->Polygon.OffsetFactor * ctx->DrawBuffer->_MRD;
 236             }
 237
 238             switch (ctx->Polygon.FrontFace) {
 239             case GL_CCW:
 240                key.fill_ccw = fill_front;
 241                key.fill_cw = fill_back;
 242                key.offset_ccw = offset_front;
 243                key.offset_cw = offset_back;
 244                if (ctx->Light.Model.TwoSide &&
 245                    key.fill_cw != CLIP_CULL)
 246                   key.copy_bfc_cw = 1;
 247                break;
 248             case GL_CW:
 249                key.fill_cw = fill_front;
 250                key.fill_ccw = fill_back;
 251                key.offset_cw = offset_front;
 252                key.offset_ccw = offset_back;
 253                if (ctx->Light.Model.TwoSide &&
 254                    key.fill_ccw != CLIP_CULL)
 255                   key.copy_bfc_ccw = 1;
 256                break;
 257             }
 258          }
 259       }
 260    }
 261
 262    dri_bo_unreference(brw->clip.prog_bo);
 263    brw->clip.prog_bo = brw_search_cache(&brw->cache, BRW_CLIP_PROG,
 264                                         &key, sizeof(key),
 265                                         NULL, 0,
 266                                         &brw->clip.prog_data);
 267    if (brw->clip.prog_bo == NULL)
 268       compile_clip_prog( brw, &key );
 269 }
 270
 271
 272 const struct brw_tracked_state brw_clip_prog = {
 273    .dirty = {
 274       .mesa  = (_NEW_LIGHT |
 275                 _NEW_TRANSFORM |
 276                 _NEW_POLYGON |
 277                 _NEW_BUFFERS),
 278       .brw   = (BRW_NEW_REDUCED_PRIMITIVE),
 279       .cache = CACHE_NEW_VS_PROG
 280    },
 281    .prepare = upload_clip_prog
 282 };