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    GLuint header_regs;
  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->gen == 5)
  76       header_regs = 3;
  77    else
  78       header_regs = 1;
  79
  80    delta = header_regs * REG_SIZE;
  81
  82    for (i = 0; i < VERT_RESULT_MAX; i++) {
  83       if (c.key.attrs & BITFIELD64_BIT(i)) {
  84          c.offset[i] = delta;
  85          delta += ATTR_SIZE;
  86
  87          c.idx_to_attr[c.nr_attrs] = i;
  88          c.nr_attrs++;
  89       }
  90    }
  91
  92    /* The vertex attributes start at a URB row-aligned offset after
  93     * the 8-20 dword vertex header, and continue for a URB row-aligned
  94     * length.  nr_regs determines the urb_read_length from the start
  95     * of the header to the end of the vertex data.
  96     */
  97    c.nr_regs = header_regs + (c.nr_attrs + 1) / 2;
  98
  99    c.nr_bytes = c.nr_regs * REG_SIZE;
 100
 101    c.prog_data.clip_mode = c.key.clip_mode; /* XXX */
 102
 103    /* For some reason the thread is spawned with only 4 channels
 104     * unmasked.
 105     */
 106    brw_set_mask_control(&c.func, BRW_MASK_DISABLE);
 107
 108
 109    /* Would ideally have the option of producing a program which could
 110     * do all three:
 111     */
 112    switch (key->primitive) {
 113    case GL_TRIANGLES:
 114       if (key->do_unfilled)
 115          brw_emit_unfilled_clip( &c );
 116       else
 117          brw_emit_tri_clip( &c );
 118       break;
 119    case GL_LINES:
 120       brw_emit_line_clip( &c );
 121       break;
 122    case GL_POINTS:
 123       brw_emit_point_clip( &c );
 124       break;
 125    default:
 126       assert(0);
 127       return;
 128    }
 129
 130
 131
 132    /* get the program
 133     */
 134    program = brw_get_program(&c.func, &program_size);
 135
 136    if (unlikely(INTEL_DEBUG & DEBUG_CLIP)) {
 137       printf("clip:\n");
 138       for (i = 0; i < program_size / sizeof(struct brw_instruction); i++)
 139          brw_disasm(stdout, &((struct brw_instruction *)program)[i],
 140                     intel->gen);
 141       printf("\n");
 142    }
 143
 144    /* Upload
 145     */
 146    drm_intel_bo_unreference(brw->clip.prog_bo);
 147    brw->clip.prog_bo = brw_upload_cache_with_auxdata(&brw->cache,
 148                                                      BRW_CLIP_PROG,
 149                                                      &c.key, sizeof(c.key),
 150                                                      NULL, 0,
 151                                                      program, program_size,
 152                                                      &c.prog_data,
 153                                                      sizeof(c.prog_data),
 154                                                      &brw->clip.prog_data);
 155 }
 156
 157 /* Calculate interpolants for triangle and line rasterization.
 158  */
 159 static void upload_clip_prog(struct brw_context *brw)
 160 {
 161    struct intel_context *intel = &brw->intel;
 162    struct gl_context *ctx = &intel->ctx;
 163    struct brw_clip_prog_key key;
 164
 165    memset(&key, 0, sizeof(key));
 166
 167    /* Populate the key:
 168     */
 169    /* BRW_NEW_REDUCED_PRIMITIVE */
 170    key.primitive = brw->intel.reduced_primitive;
 171    /* CACHE_NEW_VS_PROG */
 172    key.attrs = brw->vs.prog_data->outputs_written;
 173    /* _NEW_LIGHT */
 174    key.do_flat_shading = (ctx->Light.ShadeModel == GL_FLAT);
 175    key.pv_first = (ctx->Light.ProvokingVertex == GL_FIRST_VERTEX_CONVENTION);
 176    /* _NEW_TRANSFORM */
 177    key.nr_userclip = brw_count_bits(ctx->Transform.ClipPlanesEnabled);
 178
 179    if (intel->gen == 5)
 180        key.clip_mode = BRW_CLIPMODE_KERNEL_CLIP;
 181    else
 182        key.clip_mode = BRW_CLIPMODE_NORMAL;
 183
 184    /* _NEW_POLYGON */
 185    if (key.primitive == GL_TRIANGLES) {
 186       if (ctx->Polygon.CullFlag &&
 187           ctx->Polygon.CullFaceMode == GL_FRONT_AND_BACK)
 188          key.clip_mode = BRW_CLIPMODE_REJECT_ALL;
 189       else {
 190          GLuint fill_front = CLIP_CULL;
 191          GLuint fill_back = CLIP_CULL;
 192          GLuint offset_front = 0;
 193          GLuint offset_back = 0;
 194
 195          if (!ctx->Polygon.CullFlag ||
 196              ctx->Polygon.CullFaceMode != GL_FRONT) {
 197             switch (ctx->Polygon.FrontMode) {
 198             case GL_FILL:
 199                fill_front = CLIP_FILL;
 200                offset_front = 0;
 201                break;
 202             case GL_LINE:
 203                fill_front = CLIP_LINE;
 204                offset_front = ctx->Polygon.OffsetLine;
 205                break;
 206             case GL_POINT:
 207                fill_front = CLIP_POINT;
 208                offset_front = ctx->Polygon.OffsetPoint;
 209                break;
 210             }
 211          }
 212
 213          if (!ctx->Polygon.CullFlag ||
 214              ctx->Polygon.CullFaceMode != GL_BACK) {
 215             switch (ctx->Polygon.BackMode) {
 216             case GL_FILL:
 217                fill_back = CLIP_FILL;
 218                offset_back = 0;
 219                break;
 220             case GL_LINE:
 221                fill_back = CLIP_LINE;
 222                offset_back = ctx->Polygon.OffsetLine;
 223                break;
 224             case GL_POINT:
 225                fill_back = CLIP_POINT;
 226                offset_back = ctx->Polygon.OffsetPoint;
 227                break;
 228             }
 229          }
 230
 231          if (ctx->Polygon.BackMode != GL_FILL ||
 232              ctx->Polygon.FrontMode != GL_FILL) {
 233             key.do_unfilled = 1;
 234
 235             /* Most cases the fixed function units will handle.  Cases where
 236              * one or more polygon faces are unfilled will require help:
 237              */
 238             key.clip_mode = BRW_CLIPMODE_CLIP_NON_REJECTED;
 239
 240             if (offset_back || offset_front) {
 241                /* _NEW_POLYGON, _NEW_BUFFERS */
 242                key.offset_units = ctx->Polygon.OffsetUnits * brw->intel.polygon_offset_scale;
 243                key.offset_factor = ctx->Polygon.OffsetFactor * ctx->DrawBuffer->_MRD;
 244             }
 245
 246             switch (ctx->Polygon.FrontFace) {
 247             case GL_CCW:
 248                key.fill_ccw = fill_front;
 249                key.fill_cw = fill_back;
 250                key.offset_ccw = offset_front;
 251                key.offset_cw = offset_back;
 252                if (ctx->Light.Model.TwoSide &&
 253                    key.fill_cw != CLIP_CULL)
 254                   key.copy_bfc_cw = 1;
 255                break;
 256             case GL_CW:
 257                key.fill_cw = fill_front;
 258                key.fill_ccw = fill_back;
 259                key.offset_cw = offset_front;
 260                key.offset_ccw = offset_back;
 261                if (ctx->Light.Model.TwoSide &&
 262                    key.fill_ccw != CLIP_CULL)
 263                   key.copy_bfc_ccw = 1;
 264                break;
 265             }
 266          }
 267       }
 268    }
 269
 270    drm_intel_bo_unreference(brw->clip.prog_bo);
 271    brw->clip.prog_bo = brw_search_cache(&brw->cache, BRW_CLIP_PROG,
 272                                         &key, sizeof(key),
 273                                         NULL, 0,
 274                                         &brw->clip.prog_data);
 275    if (brw->clip.prog_bo == NULL)
 276       compile_clip_prog( brw, &key );
 277 }
 278
 279
 280 const struct brw_tracked_state brw_clip_prog = {
 281    .dirty = {
 282       .mesa  = (_NEW_LIGHT |
 283                 _NEW_TRANSFORM |
 284                 _NEW_POLYGON |
 285                 _NEW_BUFFERS),
 286       .brw   = (BRW_NEW_REDUCED_PRIMITIVE),
 287       .cache = CACHE_NEW_VS_PROG
 288    },
 289    .prepare = upload_clip_prog
 290 };