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