src/mesa/drivers/dri/i965/brw_vs.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
  33 #include "main/compiler.h"
  34 #include "brw_context.h"
  35 #include "brw_vs.h"
  36 #include "brw_util.h"
  37 #include "brw_state.h"
  38 #include "program/prog_print.h"
  39 #include "program/prog_parameter.h"
  40
  41 #include "glsl/ralloc.h"
  42
  43 static inline void assign_vue_slot(struct brw_vue_map *vue_map,
  44                                    int vert_result)
  45 {
  46    /* Make sure this vert_result hasn't been assigned a slot already */
  47    assert (vue_map->vert_result_to_slot[vert_result] == -1);
  48
  49    vue_map->vert_result_to_slot[vert_result] = vue_map->num_slots;
  50    vue_map->slot_to_vert_result[vue_map->num_slots++] = vert_result;
  51 }
  52
  53 /**
  54  * Compute the VUE map for vertex shader program.
  55  */
  56 void
  57 brw_compute_vue_map(struct brw_vue_map *vue_map,
  58                     const struct intel_context *intel,
  59                     bool userclip_active,
  60                     GLbitfield64 outputs_written)
  61 {
  62    int i;
  63
  64    vue_map->num_slots = 0;
  65    for (i = 0; i < BRW_VERT_RESULT_MAX; ++i) {
  66       vue_map->vert_result_to_slot[i] = -1;
  67       vue_map->slot_to_vert_result[i] = BRW_VERT_RESULT_MAX;
  68    }
  69
  70    /* VUE header: format depends on chip generation and whether clipping is
  71     * enabled.
  72     */
  73    switch (intel->gen) {
  74    case 4:
  75       /* There are 8 dwords in VUE header pre-Ironlake:
  76        * dword 0-3 is indices, point width, clip flags.
  77        * dword 4-7 is ndc position
  78        * dword 8-11 is the first vertex data.
  79        */
  80       assign_vue_slot(vue_map, VERT_RESULT_PSIZ);
  81       assign_vue_slot(vue_map, BRW_VERT_RESULT_NDC);
  82       assign_vue_slot(vue_map, VERT_RESULT_HPOS);
  83       break;
  84    case 5:
  85       /* There are 20 DWs (D0-D19) in VUE header on Ironlake:
  86        * dword 0-3 of the header is indices, point width, clip flags.
  87        * dword 4-7 is the ndc position
  88        * dword 8-11 of the vertex header is the 4D space position
  89        * dword 12-19 of the vertex header is the user clip distance.
  90        * dword 20-23 is a pad so that the vertex element data is aligned
  91        * dword 24-27 is the first vertex data we fill.
  92        *
  93        * Note: future pipeline stages expect 4D space position to be
  94        * contiguous with the other vert_results, so we make dword 24-27 a
  95        * duplicate copy of the 4D space position.
  96        */
  97       assign_vue_slot(vue_map, VERT_RESULT_PSIZ);
  98       assign_vue_slot(vue_map, BRW_VERT_RESULT_NDC);
  99       assign_vue_slot(vue_map, BRW_VERT_RESULT_HPOS_DUPLICATE);
 100       assign_vue_slot(vue_map, VERT_RESULT_CLIP_DIST0);
 101       assign_vue_slot(vue_map, VERT_RESULT_CLIP_DIST1);
 102       assign_vue_slot(vue_map, BRW_VERT_RESULT_PAD);
 103       assign_vue_slot(vue_map, VERT_RESULT_HPOS);
 104       break;
 105    case 6:
 106    case 7:
 107       /* There are 8 or 16 DWs (D0-D15) in VUE header on Sandybridge:
 108        * dword 0-3 of the header is indices, point width, clip flags.
 109        * dword 4-7 is the 4D space position
 110        * dword 8-15 of the vertex header is the user clip distance if
 111        * enabled.
 112        * dword 8-11 or 16-19 is the first vertex element data we fill.
 113        */
 114       assign_vue_slot(vue_map, VERT_RESULT_PSIZ);
 115       assign_vue_slot(vue_map, VERT_RESULT_HPOS);
 116       if (userclip_active) {
 117          assign_vue_slot(vue_map, VERT_RESULT_CLIP_DIST0);
 118          assign_vue_slot(vue_map, VERT_RESULT_CLIP_DIST1);
 119       }
 120       /* front and back colors need to be consecutive so that we can use
 121        * ATTRIBUTE_SWIZZLE_INPUTATTR_FACING to swizzle them when doing
 122        * two-sided color.
 123        */
 124       if (outputs_written & BITFIELD64_BIT(VERT_RESULT_COL0))
 125          assign_vue_slot(vue_map, VERT_RESULT_COL0);
 126       if (outputs_written & BITFIELD64_BIT(VERT_RESULT_BFC0))
 127          assign_vue_slot(vue_map, VERT_RESULT_BFC0);
 128       if (outputs_written & BITFIELD64_BIT(VERT_RESULT_COL1))
 129          assign_vue_slot(vue_map, VERT_RESULT_COL1);
 130       if (outputs_written & BITFIELD64_BIT(VERT_RESULT_BFC1))
 131          assign_vue_slot(vue_map, VERT_RESULT_BFC1);
 132       break;
 133    default:
 134       assert (!"VUE map not known for this chip generation");
 135       break;
 136    }
 137
 138    /* The hardware doesn't care about the rest of the vertex outputs, so just
 139     * assign them contiguously.  Don't reassign outputs that already have a
 140     * slot.
 141     *
 142     * Also, don't assign a slot for VERT_RESULT_CLIP_VERTEX, since it is
 143     * unsupported in pre-GEN6, and in GEN6+ the vertex shader converts it into
 144     * clip distances.
 145     */
 146    for (int i = 0; i < VERT_RESULT_MAX; ++i) {
 147       if ((outputs_written & BITFIELD64_BIT(i)) &&
 148           vue_map->vert_result_to_slot[i] == -1 &&
 149           i != VERT_RESULT_CLIP_VERTEX) {
 150          assign_vue_slot(vue_map, i);
 151       }
 152    }
 153 }
 154
 155
 156 /**
 157  * Decide which set of clip planes should be used when clipping via
 158  * gl_Position or gl_ClipVertex.
 159  */
 160 gl_clip_plane *brw_select_clip_planes(struct gl_context *ctx)
 161 {
 162    if (ctx->Shader.CurrentVertexProgram) {
 163       /* There is currently a GLSL vertex shader, so clip according to GLSL
 164        * rules, which means compare gl_ClipVertex (or gl_Position, if
 165        * gl_ClipVertex wasn't assigned) against the eye-coordinate clip planes
 166        * that were stored in EyeUserPlane at the time the clip planes were
 167        * specified.
 168        */
 169       return ctx->Transform.EyeUserPlane;
 170    } else {
 171       /* Either we are using fixed function or an ARB vertex program.  In
 172        * either case the clip planes are going to be compared against
 173        * gl_Position (which is in clip coordinates) so we have to clip using
 174        * _ClipUserPlane, which was transformed into clip coordinates by Mesa
 175        * core.
 176        */
 177       return ctx->Transform._ClipUserPlane;
 178    }
 179 }
 180
 181
 182 static bool
 183 do_vs_prog(struct brw_context *brw,
 184            struct gl_shader_program *prog,
 185            struct brw_vertex_program *vp,
 186            struct brw_vs_prog_key *key)
 187 {
 188    struct gl_context *ctx = &brw->intel.ctx;
 189    struct intel_context *intel = &brw->intel;
 190    GLuint program_size;
 191    const GLuint *program;
 192    struct brw_vs_compile c;
 193    void *mem_ctx;
 194    int aux_size;
 195    int i;
 196
 197    memset(&c, 0, sizeof(c));
 198    memcpy(&c.key, key, sizeof(*key));
 199
 200    mem_ctx = ralloc_context(NULL);
 201
 202    brw_init_compile(brw, &c.func, mem_ctx);
 203    c.vp = vp;
 204
 205    c.prog_data.outputs_written = vp->program.Base.OutputsWritten;
 206    c.prog_data.inputs_read = vp->program.Base.InputsRead;
 207
 208    if (c.key.copy_edgeflag) {
 209       c.prog_data.outputs_written |= BITFIELD64_BIT(VERT_RESULT_EDGE);
 210       c.prog_data.inputs_read |= 1<<VERT_ATTRIB_EDGEFLAG;
 211    }
 212
 213    /* Put dummy slots into the VUE for the SF to put the replaced
 214     * point sprite coords in.  We shouldn't need these dummy slots,
 215     * which take up precious URB space, but it would mean that the SF
 216     * doesn't get nice aligned pairs of input coords into output
 217     * coords, which would be a pain to handle.
 218     */
 219    for (i = 0; i < 8; i++) {
 220       if (c.key.point_coord_replace & (1 << i))
 221          c.prog_data.outputs_written |= BITFIELD64_BIT(VERT_RESULT_TEX0 + i);
 222    }
 223
 224    if (0) {
 225       _mesa_fprint_program_opt(stdout, &c.vp->program.Base, PROG_PRINT_DEBUG,
 226                                GL_TRUE);
 227    }
 228
 229    /* Emit GEN4 code.
 230     */
 231    if (brw->new_vs_backend && prog) {
 232       if (!brw_vs_emit(prog, &c)) {
 233          ralloc_free(mem_ctx);
 234          return false;
 235       }
 236    } else {
 237       brw_old_vs_emit(&c);
 238    }
 239
 240    /* Scratch space is used for register spilling */
 241    if (c.last_scratch) {
 242       c.prog_data.total_scratch = brw_get_scratch_size(c.last_scratch);
 243
 244       brw_get_scratch_bo(intel, &brw->vs.scratch_bo,
 245                          c.prog_data.total_scratch * brw->vs_max_threads);
 246    }
 247
 248    /* get the program
 249     */
 250    program = brw_get_program(&c.func, &program_size);
 251
 252    /* We upload from &c.prog_data including the constant_map assuming
 253     * they're packed together.  It would be nice to have a
 254     * compile-time assert macro here.
 255     */
 256    assert(c.constant_map == (int8_t *)&c.prog_data +
 257           sizeof(c.prog_data));
 258    assert(ctx->Const.VertexProgram.MaxNativeParameters ==
 259           ARRAY_SIZE(c.constant_map));
 260    (void) ctx;
 261
 262    aux_size = sizeof(c.prog_data);
 263    /* constant_map */
 264    aux_size += c.vp->program.Base.Parameters->NumParameters;
 265
 266    brw_upload_cache(&brw->cache, BRW_VS_PROG,
 267                     &c.key, sizeof(c.key),
 268                     program, program_size,
 269                     &c.prog_data, aux_size,
 270                     &brw->vs.prog_offset, &brw->vs.prog_data);
 271    ralloc_free(mem_ctx);
 272
 273    return true;
 274 }
 275
 276
 277 static void brw_upload_vs_prog(struct brw_context *brw)
 278 {
 279    struct intel_context *intel = &brw->intel;
 280    struct gl_context *ctx = &intel->ctx;
 281    struct brw_vs_prog_key key;
 282    struct brw_vertex_program *vp =
 283       (struct brw_vertex_program *)brw->vertex_program;
 284    int i;
 285
 286    memset(&key, 0, sizeof(key));
 287
 288    /* Just upload the program verbatim for now.  Always send it all
 289     * the inputs it asks for, whether they are varying or not.
 290     */
 291    key.program_string_id = vp->id;
 292    key.userclip_active = (ctx->Transform.ClipPlanesEnabled != 0);
 293    key.uses_clip_distance = vp->program.UsesClipDistance;
 294    if (key.userclip_active && !key.uses_clip_distance) {
 295       if (intel->gen < 6) {
 296          key.nr_userclip_plane_consts
 297             = _mesa_bitcount_64(ctx->Transform.ClipPlanesEnabled);
 298          key.userclip_planes_enabled_gen_4_5
 299             = ctx->Transform.ClipPlanesEnabled;
 300       } else {
 301          key.nr_userclip_plane_consts
 302             = _mesa_logbase2(ctx->Transform.ClipPlanesEnabled) + 1;
 303       }
 304    }
 305    key.copy_edgeflag = (ctx->Polygon.FrontMode != GL_FILL ||
 306                         ctx->Polygon.BackMode != GL_FILL);
 307
 308    /* _NEW_LIGHT | _NEW_BUFFERS */
 309    key.clamp_vertex_color = ctx->Light._ClampVertexColor;
 310
 311    /* _NEW_POINT */
 312    if (ctx->Point.PointSprite) {
 313       for (i = 0; i < 8; i++) {
 314          if (ctx->Point.CoordReplace[i])
 315             key.point_coord_replace |= (1 << i);
 316       }
 317    }
 318
 319    /* BRW_NEW_VERTICES */
 320    for (i = 0; i < VERT_ATTRIB_MAX; i++) {
 321       if (vp->program.Base.InputsRead & (1 << i) &&
 322           brw->vb.inputs[i].glarray->Type == GL_FIXED) {
 323          key.gl_fixed_input_size[i] = brw->vb.inputs[i].glarray->Size;
 324       }
 325    }
 326
 327    if (!brw_search_cache(&brw->cache, BRW_VS_PROG,
 328                          &key, sizeof(key),
 329                          &brw->vs.prog_offset, &brw->vs.prog_data)) {
 330       bool success = do_vs_prog(brw, ctx->Shader.CurrentVertexProgram,
 331                                 vp, &key);
 332
 333       assert(success);
 334    }
 335    brw->vs.constant_map = ((int8_t *)brw->vs.prog_data +
 336                            sizeof(*brw->vs.prog_data));
 337 }
 338
 339 /* See brw_vs.c:
 340  */
 341 const struct brw_tracked_state brw_vs_prog = {
 342    .dirty = {
 343       .mesa  = (_NEW_TRANSFORM | _NEW_POLYGON | _NEW_POINT | _NEW_LIGHT |
 344                 _NEW_BUFFERS),
 345       .brw   = (BRW_NEW_VERTEX_PROGRAM |
 346                 BRW_NEW_VERTICES),
 347       .cache = 0
 348    },
 349    .prepare = brw_upload_vs_prog
 350 };
 351
 352 bool
 353 brw_vs_precompile(struct gl_context *ctx, struct gl_shader_program *prog)
 354 {
 355    struct brw_context *brw = brw_context(ctx);
 356    struct brw_vs_prog_key key;
 357    uint32_t old_prog_offset = brw->vs.prog_offset;
 358    struct brw_vs_prog_data *old_prog_data = brw->vs.prog_data;
 359    bool success;
 360
 361    if (!prog->_LinkedShaders[MESA_SHADER_VERTEX])
 362       return true;
 363
 364    struct gl_vertex_program *vp = (struct gl_vertex_program *)
 365       prog->_LinkedShaders[MESA_SHADER_VERTEX]->Program;
 366    struct brw_vertex_program *bvp = brw_vertex_program(vp);
 367
 368    memset(&key, 0, sizeof(key));
 369
 370    key.program_string_id = bvp->id;
 371    key.clamp_vertex_color = true;
 372
 373    success = do_vs_prog(brw, prog, bvp, &key);
 374
 375    brw->vs.prog_offset = old_prog_offset;
 376    brw->vs.prog_data = old_prog_data;
 377
 378    return success;
 379 }