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 bool
  47 brw_codegen_vs_prog(struct brw_context *brw,
  48                     struct gl_shader_program *prog,
  49                     struct brw_vertex_program *vp,
  50                     struct brw_vs_prog_key *key)
  51 {
  52    const struct brw_compiler *compiler = brw->intelScreen->compiler;
  53    GLuint program_size;
  54    const GLuint *program;
  55    struct brw_vs_prog_data prog_data;
  56    struct brw_stage_prog_data *stage_prog_data = &prog_data.base.base;
  57    void *mem_ctx;
  58    int i;
  59    struct brw_shader *vs = NULL;
  60    bool start_busy = false;
  61    double start_time = 0;
  62
  63    if (prog)
  64       vs = (struct brw_shader *) prog->_LinkedShaders[MESA_SHADER_VERTEX];
  65
  66    memset(&prog_data, 0, sizeof(prog_data));
  67
  68    /* Use ALT floating point mode for ARB programs so that 0^0 == 1. */
  69    if (!prog)
  70       stage_prog_data->use_alt_mode = true;
  71
  72    mem_ctx = ralloc_context(NULL);
  73
  74    brw_assign_common_binding_table_offsets(MESA_SHADER_VERTEX,
  75                                            brw->intelScreen->devinfo,
  76                                            prog, &vp->program.Base,
  77                                            &prog_data.base.base, 0);
  78
  79    /* Allocate the references to the uniforms that will end up in the
  80     * prog_data associated with the compiled program, and which will be freed
  81     * by the state cache.
  82     */
  83    int param_count = vp->program.Base.nir->num_uniforms;
  84    if (!compiler->scalar_stage[MESA_SHADER_VERTEX])
  85       param_count *= 4;
  86
  87    if (vs)
  88       prog_data.base.base.nr_image_params = vs->base.NumImages;
  89
  90    /* vec4_visitor::setup_uniform_clipplane_values() also uploads user clip
  91     * planes as uniforms.
  92     */
  93    param_count += key->nr_userclip_plane_consts * 4;
  94
  95    stage_prog_data->param =
  96       rzalloc_array(NULL, const gl_constant_value *, param_count);
  97    stage_prog_data->pull_param =
  98       rzalloc_array(NULL, const gl_constant_value *, param_count);
  99    stage_prog_data->image_param =
 100       rzalloc_array(NULL, struct brw_image_param,
 101                     stage_prog_data->nr_image_params);
 102    stage_prog_data->nr_params = param_count;
 103
 104    if (prog) {
 105       brw_nir_setup_glsl_uniforms(vp->program.Base.nir, prog, &vp->program.Base,
 106                                   &prog_data.base.base,
 107                                   compiler->scalar_stage[MESA_SHADER_VERTEX]);
 108    } else {
 109       brw_nir_setup_arb_uniforms(vp->program.Base.nir, &vp->program.Base,
 110                                  &prog_data.base.base);
 111    }
 112
 113    GLbitfield64 outputs_written = vp->program.Base.OutputsWritten;
 114    prog_data.inputs_read = vp->program.Base.InputsRead;
 115
 116    if (key->copy_edgeflag) {
 117       outputs_written |= BITFIELD64_BIT(VARYING_SLOT_EDGE);
 118       prog_data.inputs_read |= VERT_BIT_EDGEFLAG;
 119    }
 120
 121    if (brw->gen < 6) {
 122       /* Put dummy slots into the VUE for the SF to put the replaced
 123        * point sprite coords in.  We shouldn't need these dummy slots,
 124        * which take up precious URB space, but it would mean that the SF
 125        * doesn't get nice aligned pairs of input coords into output
 126        * coords, which would be a pain to handle.
 127        */
 128       for (i = 0; i < 8; i++) {
 129          if (key->point_coord_replace & (1 << i))
 130             outputs_written |= BITFIELD64_BIT(VARYING_SLOT_TEX0 + i);
 131       }
 132
 133       /* if back colors are written, allocate slots for front colors too */
 134       if (outputs_written & BITFIELD64_BIT(VARYING_SLOT_BFC0))
 135          outputs_written |= BITFIELD64_BIT(VARYING_SLOT_COL0);
 136       if (outputs_written & BITFIELD64_BIT(VARYING_SLOT_BFC1))
 137          outputs_written |= BITFIELD64_BIT(VARYING_SLOT_COL1);
 138    }
 139
 140    /* In order for legacy clipping to work, we need to populate the clip
 141     * distance varying slots whenever clipping is enabled, even if the vertex
 142     * shader doesn't write to gl_ClipDistance.
 143     */
 144    if (key->nr_userclip_plane_consts > 0) {
 145       outputs_written |= BITFIELD64_BIT(VARYING_SLOT_CLIP_DIST0);
 146       outputs_written |= BITFIELD64_BIT(VARYING_SLOT_CLIP_DIST1);
 147    }
 148
 149    brw_compute_vue_map(brw->intelScreen->devinfo,
 150                        &prog_data.base.vue_map, outputs_written,
 151                        prog ? prog->SeparateShader : false);
 152
 153    if (0) {
 154       _mesa_fprint_program_opt(stderr, &vp->program.Base, PROG_PRINT_DEBUG,
 155                                true);
 156    }
 157
 158    if (unlikely(brw->perf_debug)) {
 159       start_busy = (brw->batch.last_bo &&
 160                     drm_intel_bo_busy(brw->batch.last_bo));
 161       start_time = get_time();
 162    }
 163
 164    if (unlikely(INTEL_DEBUG & DEBUG_VS)) {
 165       brw_dump_ir("vertex", prog, vs ? &vs->base : NULL, &vp->program.Base);
 166
 167       fprintf(stderr, "VS Output ");
 168       brw_print_vue_map(stderr, &prog_data.base.vue_map);
 169    }
 170
 171    int st_index = -1;
 172    if (INTEL_DEBUG & DEBUG_SHADER_TIME)
 173       st_index = brw_get_shader_time_index(brw, prog, &vp->program.Base, ST_VS);
 174
 175    /* Emit GEN4 code.
 176     */
 177    char *error_str;
 178    program = brw_compile_vs(compiler, brw, mem_ctx, key,
 179                             &prog_data, vp->program.Base.nir,
 180                             brw_select_clip_planes(&brw->ctx),
 181                             !_mesa_is_gles3(&brw->ctx),
 182                             st_index, &program_size, &error_str);
 183    if (program == NULL) {
 184       if (prog) {
 185          prog->LinkStatus = false;
 186          ralloc_strcat(&prog->InfoLog, error_str);
 187       }
 188
 189       _mesa_problem(NULL, "Failed to compile vertex shader: %s\n", error_str);
 190
 191       ralloc_free(mem_ctx);
 192       return false;
 193    }
 194
 195    if (unlikely(brw->perf_debug) && vs) {
 196       if (vs->compiled_once) {
 197          brw_vs_debug_recompile(brw, prog, key);
 198       }
 199       if (start_busy && !drm_intel_bo_busy(brw->batch.last_bo)) {
 200          perf_debug("VS compile took %.03f ms and stalled the GPU\n",
 201                     (get_time() - start_time) * 1000);
 202       }
 203       vs->compiled_once = true;
 204    }
 205
 206    /* Scratch space is used for register spilling */
 207    if (prog_data.base.base.total_scratch) {
 208       brw_get_scratch_bo(brw, &brw->vs.base.scratch_bo,
 209                          prog_data.base.base.total_scratch *
 210                          brw->max_vs_threads);
 211    }
 212
 213    brw_upload_cache(&brw->cache, BRW_CACHE_VS_PROG,
 214                     key, sizeof(struct brw_vs_prog_key),
 215                     program, program_size,
 216                     &prog_data, sizeof(prog_data),
 217                     &brw->vs.base.prog_offset, &brw->vs.prog_data);
 218    ralloc_free(mem_ctx);
 219
 220    return true;
 221 }
 222
 223 static bool
 224 key_debug(struct brw_context *brw, const char *name, int a, int b)
 225 {
 226    if (a != b) {
 227       perf_debug("  %s %d->%d\n", name, a, b);
 228       return true;
 229    }
 230    return false;
 231 }
 232
 233 void
 234 brw_vs_debug_recompile(struct brw_context *brw,
 235                        struct gl_shader_program *prog,
 236                        const struct brw_vs_prog_key *key)
 237 {
 238    struct brw_cache_item *c = NULL;
 239    const struct brw_vs_prog_key *old_key = NULL;
 240    bool found = false;
 241
 242    perf_debug("Recompiling vertex shader for program %d\n", prog->Name);
 243
 244    for (unsigned int i = 0; i < brw->cache.size; i++) {
 245       for (c = brw->cache.items[i]; c; c = c->next) {
 246          if (c->cache_id == BRW_CACHE_VS_PROG) {
 247             old_key = c->key;
 248
 249             if (old_key->program_string_id == key->program_string_id)
 250                break;
 251          }
 252       }
 253       if (c)
 254          break;
 255    }
 256
 257    if (!c) {
 258       perf_debug("  Didn't find previous compile in the shader cache for "
 259                  "debug\n");
 260       return;
 261    }
 262
 263    for (unsigned int i = 0; i < VERT_ATTRIB_MAX; i++) {
 264       found |= key_debug(brw, "Vertex attrib w/a flags",
 265                          old_key->gl_attrib_wa_flags[i],
 266                          key->gl_attrib_wa_flags[i]);
 267    }
 268
 269    found |= key_debug(brw, "legacy user clipping",
 270                       old_key->nr_userclip_plane_consts,
 271                       key->nr_userclip_plane_consts);
 272
 273    found |= key_debug(brw, "copy edgeflag",
 274                       old_key->copy_edgeflag, key->copy_edgeflag);
 275    found |= key_debug(brw, "PointCoord replace",
 276                       old_key->point_coord_replace, key->point_coord_replace);
 277    found |= key_debug(brw, "vertex color clamping",
 278                       old_key->clamp_vertex_color, key->clamp_vertex_color);
 279
 280    found |= brw_debug_recompile_sampler_key(brw, &old_key->tex, &key->tex);
 281
 282    if (!found) {
 283       perf_debug("  Something else\n");
 284    }
 285 }
 286
 287 static bool
 288 brw_vs_state_dirty(struct brw_context *brw)
 289 {
 290    return brw_state_dirty(brw,
 291                           _NEW_BUFFERS |
 292                           _NEW_LIGHT |
 293                           _NEW_POINT |
 294                           _NEW_POLYGON |
 295                           _NEW_TEXTURE |
 296                           _NEW_TRANSFORM,
 297                           BRW_NEW_VERTEX_PROGRAM |
 298                           BRW_NEW_VS_ATTRIB_WORKAROUNDS);
 299 }
 300
 301 static void
 302 brw_vs_populate_key(struct brw_context *brw,
 303                     struct brw_vs_prog_key *key)
 304 {
 305    struct gl_context *ctx = &brw->ctx;
 306    /* BRW_NEW_VERTEX_PROGRAM */
 307    struct brw_vertex_program *vp =
 308       (struct brw_vertex_program *)brw->vertex_program;
 309    struct gl_program *prog = (struct gl_program *) brw->vertex_program;
 310    int i;
 311
 312    memset(key, 0, sizeof(*key));
 313
 314    /* Just upload the program verbatim for now.  Always send it all
 315     * the inputs it asks for, whether they are varying or not.
 316     */
 317    key->program_string_id = vp->id;
 318
 319    if (ctx->Transform.ClipPlanesEnabled != 0 &&
 320        (ctx->API == API_OPENGL_COMPAT ||
 321         ctx->API == API_OPENGLES) &&
 322        vp->program.Base.ClipDistanceArraySize == 0) {
 323       key->nr_userclip_plane_consts =
 324          _mesa_logbase2(ctx->Transform.ClipPlanesEnabled) + 1;
 325    }
 326
 327    /* _NEW_POLYGON */
 328    if (brw->gen < 6) {
 329       key->copy_edgeflag = (ctx->Polygon.FrontMode != GL_FILL ||
 330                             ctx->Polygon.BackMode != GL_FILL);
 331    }
 332
 333    if (prog->OutputsWritten & (VARYING_BIT_COL0 | VARYING_BIT_COL1 |
 334                                VARYING_BIT_BFC0 | VARYING_BIT_BFC1)) {
 335       /* _NEW_LIGHT | _NEW_BUFFERS */
 336       key->clamp_vertex_color = ctx->Light._ClampVertexColor;
 337    }
 338
 339    /* _NEW_POINT */
 340    if (brw->gen < 6 && ctx->Point.PointSprite) {
 341       for (i = 0; i < 8; i++) {
 342          if (ctx->Point.CoordReplace[i])
 343             key->point_coord_replace |= (1 << i);
 344       }
 345    }
 346
 347    /* _NEW_TEXTURE */
 348    brw_populate_sampler_prog_key_data(ctx, prog, brw->vs.base.sampler_count,
 349                                       &key->tex);
 350
 351    /* BRW_NEW_VS_ATTRIB_WORKAROUNDS */
 352    memcpy(key->gl_attrib_wa_flags, brw->vb.attrib_wa_flags,
 353           sizeof(brw->vb.attrib_wa_flags));
 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_vertex_program *vp =
 364       (struct brw_vertex_program *)brw->vertex_program;
 365
 366    if (!brw_vs_state_dirty(brw))
 367       return;
 368
 369    brw_vs_populate_key(brw, &key);
 370
 371    if (!brw_search_cache(&brw->cache, BRW_CACHE_VS_PROG,
 372                          &key, sizeof(key),
 373                          &brw->vs.base.prog_offset, &brw->vs.prog_data)) {
 374       bool success = brw_codegen_vs_prog(brw, current[MESA_SHADER_VERTEX],
 375                                          vp, &key);
 376       (void) success;
 377       assert(success);
 378    }
 379    brw->vs.base.prog_data = &brw->vs.prog_data->base.base;
 380 }
 381
 382 bool
 383 brw_vs_precompile(struct gl_context *ctx,
 384                   struct gl_shader_program *shader_prog,
 385                   struct gl_program *prog)
 386 {
 387    struct brw_context *brw = brw_context(ctx);
 388    struct brw_vs_prog_key key;
 389    uint32_t old_prog_offset = brw->vs.base.prog_offset;
 390    struct brw_vs_prog_data *old_prog_data = brw->vs.prog_data;
 391    bool success;
 392
 393    struct gl_vertex_program *vp = (struct gl_vertex_program *) prog;
 394    struct brw_vertex_program *bvp = brw_vertex_program(vp);
 395
 396    memset(&key, 0, sizeof(key));
 397
 398    brw_setup_tex_for_precompile(brw, &key.tex, prog);
 399    key.program_string_id = bvp->id;
 400    key.clamp_vertex_color =
 401       (prog->OutputsWritten & (VARYING_BIT_COL0 | VARYING_BIT_COL1 |
 402                                VARYING_BIT_BFC0 | VARYING_BIT_BFC1));
 403
 404    success = brw_codegen_vs_prog(brw, shader_prog, bvp, &key);
 405
 406    brw->vs.base.prog_offset = old_prog_offset;
 407    brw->vs.prog_data = old_prog_data;
 408
 409    return success;
 410 }