src/mesa/drivers/dri/i965/brw_vs.c

   1 /*
   2  Copyright (C) Intel Corp.  2006.  All Rights Reserved.
   3  Intel funded Tungsten Graphics 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 <keithw@vmware.com>
  30   */
  31
  32
  33 #include "main/compiler.h"
  34 #include "main/context.h"
  35 #include "brw_context.h"
  36 #include "brw_vs.h"
  37 #include "brw_util.h"
  38 #include "brw_state.h"
  39 #include "program/prog_print.h"
  40 #include "program/prog_parameter.h"
  41 #include "brw_nir.h"
  42 #include "brw_program.h"
  43
  44 #include "util/ralloc.h"
  45
  46 GLbitfield64
  47 brw_vs_outputs_written(struct brw_context *brw, struct brw_vs_prog_key *key,
  48                        GLbitfield64 user_varyings)
  49 {
  50    GLbitfield64 outputs_written = user_varyings;
  51
  52    if (key->copy_edgeflag) {
  53       outputs_written |= BITFIELD64_BIT(VARYING_SLOT_EDGE);
  54    }
  55
  56    if (brw->gen < 6) {
  57       /* Put dummy slots into the VUE for the SF to put the replaced
  58        * point sprite coords in.  We shouldn't need these dummy slots,
  59        * which take up precious URB space, but it would mean that the SF
  60        * doesn't get nice aligned pairs of input coords into output
  61        * coords, which would be a pain to handle.
  62        */
  63       for (unsigned i = 0; i < 8; i++) {
  64          if (key->point_coord_replace & (1 << i))
  65             outputs_written |= BITFIELD64_BIT(VARYING_SLOT_TEX0 + i);
  66       }
  67
  68       /* if back colors are written, allocate slots for front colors too */
  69       if (outputs_written & BITFIELD64_BIT(VARYING_SLOT_BFC0))
  70          outputs_written |= BITFIELD64_BIT(VARYING_SLOT_COL0);
  71       if (outputs_written & BITFIELD64_BIT(VARYING_SLOT_BFC1))
  72          outputs_written |= BITFIELD64_BIT(VARYING_SLOT_COL1);
  73    }
  74
  75    /* In order for legacy clipping to work, we need to populate the clip
  76     * distance varying slots whenever clipping is enabled, even if the vertex
  77     * shader doesn't write to gl_ClipDistance.
  78     */
  79    if (key->nr_userclip_plane_consts > 0) {
  80       outputs_written |= BITFIELD64_BIT(VARYING_SLOT_CLIP_DIST0);
  81       outputs_written |= BITFIELD64_BIT(VARYING_SLOT_CLIP_DIST1);
  82    }
  83
  84    return outputs_written;
  85 }
  86
  87 bool
  88 brw_codegen_vs_prog(struct brw_context *brw,
  89                     struct gl_shader_program *prog,
  90                     struct brw_program *vp,
  91                     struct brw_vs_prog_key *key)
  92 {
  93    const struct brw_compiler *compiler = brw->screen->compiler;
  94    const struct gen_device_info *devinfo = &brw->screen->devinfo;
  95    GLuint program_size;
  96    const GLuint *program;
  97    struct brw_vs_prog_data prog_data;
  98    struct brw_stage_prog_data *stage_prog_data = &prog_data.base.base;
  99    void *mem_ctx;
 100    struct brw_shader *vs = NULL;
 101    bool start_busy = false;
 102    double start_time = 0;
 103
 104    if (prog)
 105       vs = (struct brw_shader *) prog->_LinkedShaders[MESA_SHADER_VERTEX];
 106
 107    memset(&prog_data, 0, sizeof(prog_data));
 108
 109    /* Use ALT floating point mode for ARB programs so that 0^0 == 1. */
 110    if (!prog)
 111       stage_prog_data->use_alt_mode = true;
 112
 113    mem_ctx = ralloc_context(NULL);
 114
 115    brw_assign_common_binding_table_offsets(MESA_SHADER_VERTEX, devinfo, prog,
 116                                            &vp->program, &prog_data.base.base,
 117                                            0);
 118
 119    /* Allocate the references to the uniforms that will end up in the
 120     * prog_data associated with the compiled program, and which will be freed
 121     * by the state cache.
 122     */
 123    int param_count = vp->program.nir->num_uniforms / 4;
 124
 125    if (vs)
 126       prog_data.base.base.nr_image_params = vs->base.NumImages;
 127
 128    /* vec4_visitor::setup_uniform_clipplane_values() also uploads user clip
 129     * planes as uniforms.
 130     */
 131    param_count += key->nr_userclip_plane_consts * 4;
 132
 133    stage_prog_data->param =
 134       rzalloc_array(NULL, const gl_constant_value *, param_count);
 135    stage_prog_data->pull_param =
 136       rzalloc_array(NULL, const gl_constant_value *, param_count);
 137    stage_prog_data->image_param =
 138       rzalloc_array(NULL, struct brw_image_param,
 139                     stage_prog_data->nr_image_params);
 140    stage_prog_data->nr_params = param_count;
 141
 142    if (prog) {
 143       brw_nir_setup_glsl_uniforms(vp->program.nir, prog, &vp->program,
 144                                   &prog_data.base.base,
 145                                   compiler->scalar_stage[MESA_SHADER_VERTEX]);
 146    } else {
 147       brw_nir_setup_arb_uniforms(vp->program.nir, &vp->program,
 148                                  &prog_data.base.base);
 149    }
 150
 151    uint64_t outputs_written =
 152       brw_vs_outputs_written(brw, key, vp->program.info.outputs_written);
 153    prog_data.inputs_read = vp->program.info.inputs_read;
 154    prog_data.double_inputs_read = vp->program.info.double_inputs_read;
 155
 156    if (key->copy_edgeflag) {
 157       prog_data.inputs_read |= VERT_BIT_EDGEFLAG;
 158    }
 159
 160    prog_data.base.cull_distance_mask =
 161       ((1 << vp->program.CullDistanceArraySize) - 1) <<
 162       vp->program.ClipDistanceArraySize;
 163
 164    brw_compute_vue_map(devinfo,
 165                        &prog_data.base.vue_map, outputs_written,
 166                        prog ? prog->SeparateShader ||
 167                               prog->_LinkedShaders[MESA_SHADER_TESS_EVAL]
 168                             : false);
 169
 170    if (0) {
 171       _mesa_fprint_program_opt(stderr, &vp->program, PROG_PRINT_DEBUG, true);
 172    }
 173
 174    if (unlikely(brw->perf_debug)) {
 175       start_busy = (brw->batch.last_bo &&
 176                     drm_intel_bo_busy(brw->batch.last_bo));
 177       start_time = get_time();
 178    }
 179
 180    if (unlikely(INTEL_DEBUG & DEBUG_VS)) {
 181       brw_dump_ir("vertex", prog, vs ? &vs->base : NULL, &vp->program);
 182
 183       fprintf(stderr, "VS Output ");
 184       brw_print_vue_map(stderr, &prog_data.base.vue_map);
 185    }
 186
 187    int st_index = -1;
 188    if (INTEL_DEBUG & DEBUG_SHADER_TIME)
 189       st_index = brw_get_shader_time_index(brw, prog, &vp->program, ST_VS);
 190
 191    /* Emit GEN4 code.
 192     */
 193    char *error_str;
 194    program = brw_compile_vs(compiler, brw, mem_ctx, key, &prog_data,
 195                             vp->program.nir,
 196                             brw_select_clip_planes(&brw->ctx),
 197                             !_mesa_is_gles3(&brw->ctx),
 198                             st_index, &program_size, &error_str);
 199    if (program == NULL) {
 200       if (prog) {
 201          prog->LinkStatus = false;
 202          ralloc_strcat(&prog->InfoLog, error_str);
 203       }
 204
 205       _mesa_problem(NULL, "Failed to compile vertex shader: %s\n", error_str);
 206
 207       ralloc_free(mem_ctx);
 208       return false;
 209    }
 210
 211    if (unlikely(brw->perf_debug) && vs) {
 212       if (vs->compiled_once) {
 213          brw_vs_debug_recompile(brw, prog, key);
 214       }
 215       if (start_busy && !drm_intel_bo_busy(brw->batch.last_bo)) {
 216          perf_debug("VS compile took %.03f ms and stalled the GPU\n",
 217                     (get_time() - start_time) * 1000);
 218       }
 219       vs->compiled_once = true;
 220    }
 221
 222    /* Scratch space is used for register spilling */
 223    brw_alloc_stage_scratch(brw, &brw->vs.base,
 224                            prog_data.base.base.total_scratch,
 225                            devinfo->max_vs_threads);
 226
 227    brw_upload_cache(&brw->cache, BRW_CACHE_VS_PROG,
 228                     key, sizeof(struct brw_vs_prog_key),
 229                     program, program_size,
 230                     &prog_data, sizeof(prog_data),
 231                     &brw->vs.base.prog_offset, &brw->vs.base.prog_data);
 232    ralloc_free(mem_ctx);
 233
 234    return true;
 235 }
 236
 237 void
 238 brw_vs_debug_recompile(struct brw_context *brw,
 239                        struct gl_shader_program *prog,
 240                        const struct brw_vs_prog_key *key)
 241 {
 242    struct brw_cache_item *c = NULL;
 243    const struct brw_vs_prog_key *old_key = NULL;
 244    bool found = false;
 245
 246    perf_debug("Recompiling vertex shader for program %d\n", prog->Name);
 247
 248    for (unsigned int i = 0; i < brw->cache.size; i++) {
 249       for (c = brw->cache.items[i]; c; c = c->next) {
 250          if (c->cache_id == BRW_CACHE_VS_PROG) {
 251             old_key = c->key;
 252
 253             if (old_key->program_string_id == key->program_string_id)
 254                break;
 255          }
 256       }
 257       if (c)
 258          break;
 259    }
 260
 261    if (!c) {
 262       perf_debug("  Didn't find previous compile in the shader cache for "
 263                  "debug\n");
 264       return;
 265    }
 266
 267    for (unsigned int i = 0; i < VERT_ATTRIB_MAX; i++) {
 268       found |= key_debug(brw, "Vertex attrib w/a flags",
 269                          old_key->gl_attrib_wa_flags[i],
 270                          key->gl_attrib_wa_flags[i]);
 271    }
 272
 273    found |= key_debug(brw, "legacy user clipping",
 274                       old_key->nr_userclip_plane_consts,
 275                       key->nr_userclip_plane_consts);
 276
 277    found |= key_debug(brw, "copy edgeflag",
 278                       old_key->copy_edgeflag, key->copy_edgeflag);
 279    found |= key_debug(brw, "PointCoord replace",
 280                       old_key->point_coord_replace, key->point_coord_replace);
 281    found |= key_debug(brw, "vertex color clamping",
 282                       old_key->clamp_vertex_color, key->clamp_vertex_color);
 283
 284    found |= brw_debug_recompile_sampler_key(brw, &old_key->tex, &key->tex);
 285
 286    if (!found) {
 287       perf_debug("  Something else\n");
 288    }
 289 }
 290
 291 static bool
 292 brw_vs_state_dirty(const struct brw_context *brw)
 293 {
 294    return brw_state_dirty(brw,
 295                           _NEW_BUFFERS |
 296                           _NEW_LIGHT |
 297                           _NEW_POINT |
 298                           _NEW_POLYGON |
 299                           _NEW_TEXTURE |
 300                           _NEW_TRANSFORM,
 301                           BRW_NEW_VERTEX_PROGRAM |
 302                           BRW_NEW_VS_ATTRIB_WORKAROUNDS);
 303 }
 304
 305 void
 306 brw_vs_populate_key(struct brw_context *brw,
 307                     struct brw_vs_prog_key *key)
 308 {
 309    struct gl_context *ctx = &brw->ctx;
 310    /* BRW_NEW_VERTEX_PROGRAM */
 311    struct brw_program *vp = (struct brw_program *)brw->vertex_program;
 312    struct gl_program *prog = (struct gl_program *) brw->vertex_program;
 313
 314    memset(key, 0, sizeof(*key));
 315
 316    /* Just upload the program verbatim for now.  Always send it all
 317     * the inputs it asks for, whether they are varying or not.
 318     */
 319    key->program_string_id = vp->id;
 320
 321    if (ctx->Transform.ClipPlanesEnabled != 0 &&
 322        (ctx->API == API_OPENGL_COMPAT || ctx->API == API_OPENGLES) &&
 323        vp->program.ClipDistanceArraySize == 0) {
 324       key->nr_userclip_plane_consts =
 325          _mesa_logbase2(ctx->Transform.ClipPlanesEnabled) + 1;
 326    }
 327
 328    if (brw->gen < 6) {
 329       /* _NEW_POLYGON */
 330       key->copy_edgeflag = (ctx->Polygon.FrontMode != GL_FILL ||
 331                             ctx->Polygon.BackMode != GL_FILL);
 332
 333       /* _NEW_POINT */
 334       if (ctx->Point.PointSprite) {
 335          key->point_coord_replace = ctx->Point.CoordReplace & 0xff;
 336       }
 337    }
 338
 339    if (prog->nir->info->outputs_written &
 340        (VARYING_BIT_COL0 | VARYING_BIT_COL1 | VARYING_BIT_BFC0 |
 341         VARYING_BIT_BFC1)) {
 342       /* _NEW_LIGHT | _NEW_BUFFERS */
 343       key->clamp_vertex_color = ctx->Light._ClampVertexColor;
 344    }
 345
 346    /* _NEW_TEXTURE */
 347    brw_populate_sampler_prog_key_data(ctx, prog, &key->tex);
 348
 349    /* BRW_NEW_VS_ATTRIB_WORKAROUNDS */
 350    if (brw->gen < 8 && !brw->is_haswell) {
 351       memcpy(key->gl_attrib_wa_flags, brw->vb.attrib_wa_flags,
 352              sizeof(brw->vb.attrib_wa_flags));
 353    }
 354 }
 355
 356 void
 357 brw_upload_vs_prog(struct brw_context *brw)
 358 {
 359    struct gl_context *ctx = &brw->ctx;
 360    struct gl_shader_program **current = ctx->_Shader->CurrentProgram;
 361    struct brw_vs_prog_key key;
 362    /* BRW_NEW_VERTEX_PROGRAM */
 363    struct brw_program *vp = (struct brw_program *)brw->vertex_program;
 364
 365    if (!brw_vs_state_dirty(brw))
 366       return;
 367
 368    brw_vs_populate_key(brw, &key);
 369
 370    if (!brw_search_cache(&brw->cache, BRW_CACHE_VS_PROG,
 371                          &key, sizeof(key),
 372                          &brw->vs.base.prog_offset, &brw->vs.base.prog_data)) {
 373       bool success = brw_codegen_vs_prog(brw, current[MESA_SHADER_VERTEX],
 374                                          vp, &key);
 375       (void) success;
 376       assert(success);
 377    }
 378 }
 379
 380 bool
 381 brw_vs_precompile(struct gl_context *ctx,
 382                   struct gl_shader_program *shader_prog,
 383                   struct gl_program *prog)
 384 {
 385    struct brw_context *brw = brw_context(ctx);
 386    struct brw_vs_prog_key key;
 387    uint32_t old_prog_offset = brw->vs.base.prog_offset;
 388    struct brw_stage_prog_data *old_prog_data = brw->vs.base.prog_data;
 389    bool success;
 390
 391    struct brw_program *bvp = brw_program(prog);
 392
 393    memset(&key, 0, sizeof(key));
 394
 395    brw_setup_tex_for_precompile(brw, &key.tex, prog);
 396    key.program_string_id = bvp->id;
 397    key.clamp_vertex_color =
 398       (prog->nir->info->outputs_written &
 399        (VARYING_BIT_COL0 | VARYING_BIT_COL1 | VARYING_BIT_BFC0 |
 400         VARYING_BIT_BFC1));
 401
 402    success = brw_codegen_vs_prog(brw, shader_prog, bvp, &key);
 403
 404    brw->vs.base.prog_offset = old_prog_offset;
 405    brw->vs.base.prog_data = old_prog_data;
 406
 407    return success;
 408 }