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

   1 /*
   2  * Copyright © 2014 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  21  * DEALINGS IN THE SOFTWARE.
  22  */
  23
  24 /**
  25  * \file brw_tcs.c
  26  *
  27  * Tessellation control shader state upload code.
  28  */
  29
  30 #include "brw_context.h"
  31 #include "compiler/brw_nir.h"
  32 #include "brw_program.h"
  33 #include "brw_state.h"
  34 #include "program/prog_parameter.h"
  35 #include "nir_builder.h"
  36
  37 static nir_shader *
  38 create_passthrough_tcs(void *mem_ctx, const struct brw_compiler *compiler,
  39                        const nir_shader_compiler_options *options,
  40                        const struct brw_tcs_prog_key *key)
  41 {
  42    nir_builder b;
  43    nir_builder_init_simple_shader(&b, mem_ctx, MESA_SHADER_TESS_CTRL,
  44                                   options);
  45    nir_shader *nir = b.shader;
  46    nir_variable *var;
  47    nir_intrinsic_instr *load;
  48    nir_intrinsic_instr *store;
  49    nir_ssa_def *zero = nir_imm_int(&b, 0);
  50    nir_ssa_def *invoc_id =
  51       nir_load_system_value(&b, nir_intrinsic_load_invocation_id, 0);
  52
  53    nir->info.inputs_read = key->outputs_written &
  54       ~(VARYING_BIT_TESS_LEVEL_INNER | VARYING_BIT_TESS_LEVEL_OUTER);
  55    nir->info.outputs_written = key->outputs_written;
  56    nir->info.tess.tcs_vertices_out = key->input_vertices;
  57    nir->info.name = ralloc_strdup(nir, "passthrough");
  58    nir->num_uniforms = 8 * sizeof(uint32_t);
  59
  60    var = nir_variable_create(nir, nir_var_uniform, glsl_vec4_type(), "hdr_0");
  61    var->data.location = 0;
  62    var = nir_variable_create(nir, nir_var_uniform, glsl_vec4_type(), "hdr_1");
  63    var->data.location = 1;
  64
  65    /* Write the patch URB header. */
  66    for (int i = 0; i <= 1; i++) {
  67       load = nir_intrinsic_instr_create(nir, nir_intrinsic_load_uniform);
  68       load->num_components = 4;
  69       load->src[0] = nir_src_for_ssa(zero);
  70       nir_ssa_dest_init(&load->instr, &load->dest, 4, 32, NULL);
  71       nir_intrinsic_set_base(load, i * 4 * sizeof(uint32_t));
  72       nir_builder_instr_insert(&b, &load->instr);
  73
  74       store = nir_intrinsic_instr_create(nir, nir_intrinsic_store_output);
  75       store->num_components = 4;
  76       store->src[0] = nir_src_for_ssa(&load->dest.ssa);
  77       store->src[1] = nir_src_for_ssa(zero);
  78       nir_intrinsic_set_base(store, VARYING_SLOT_TESS_LEVEL_INNER - i);
  79       nir_intrinsic_set_write_mask(store, WRITEMASK_XYZW);
  80       nir_builder_instr_insert(&b, &store->instr);
  81    }
  82
  83    /* Copy inputs to outputs. */
  84    uint64_t varyings = nir->info.inputs_read;
  85
  86    while (varyings != 0) {
  87       const int varying = ffsll(varyings) - 1;
  88
  89       load = nir_intrinsic_instr_create(nir,
  90                                         nir_intrinsic_load_per_vertex_input);
  91       load->num_components = 4;
  92       load->src[0] = nir_src_for_ssa(invoc_id);
  93       load->src[1] = nir_src_for_ssa(zero);
  94       nir_ssa_dest_init(&load->instr, &load->dest, 4, 32, NULL);
  95       nir_intrinsic_set_base(load, varying);
  96       nir_builder_instr_insert(&b, &load->instr);
  97
  98       store = nir_intrinsic_instr_create(nir,
  99                                          nir_intrinsic_store_per_vertex_output);
 100       store->num_components = 4;
 101       store->src[0] = nir_src_for_ssa(&load->dest.ssa);
 102       store->src[1] = nir_src_for_ssa(invoc_id);
 103       store->src[2] = nir_src_for_ssa(zero);
 104       nir_intrinsic_set_base(store, varying);
 105       nir_intrinsic_set_write_mask(store, WRITEMASK_XYZW);
 106       nir_builder_instr_insert(&b, &store->instr);
 107
 108       varyings &= ~BITFIELD64_BIT(varying);
 109    }
 110
 111    nir_validate_shader(nir);
 112
 113    nir = brw_preprocess_nir(compiler, nir);
 114
 115    return nir;
 116 }
 117
 118 static void
 119 brw_tcs_debug_recompile(struct brw_context *brw, struct gl_program *prog,
 120                        const struct brw_tcs_prog_key *key)
 121 {
 122    perf_debug("Recompiling tessellation control shader for program %d\n",
 123               prog->Id);
 124
 125    bool found = false;
 126    const struct brw_tcs_prog_key *old_key =
 127       brw_find_previous_compile(&brw->cache, BRW_CACHE_TCS_PROG,
 128                                 key->program_string_id);
 129
 130    if (!old_key) {
 131       perf_debug("  Didn't find previous compile in the shader cache for "
 132                  "debug\n");
 133       return;
 134    }
 135
 136    found |= key_debug(brw, "input vertices", old_key->input_vertices,
 137                       key->input_vertices);
 138    found |= key_debug(brw, "outputs written", old_key->outputs_written,
 139                       key->outputs_written);
 140    found |= key_debug(brw, "patch outputs written", old_key->patch_outputs_written,
 141                       key->patch_outputs_written);
 142    found |= key_debug(brw, "TES primitive mode", old_key->tes_primitive_mode,
 143                       key->tes_primitive_mode);
 144    found |= key_debug(brw, "quads and equal_spacing workaround",
 145                       old_key->quads_workaround, key->quads_workaround);
 146    found |= brw_debug_recompile_sampler_key(brw, &old_key->tex, &key->tex);
 147
 148    if (!found) {
 149       perf_debug("  Something else\n");
 150    }
 151 }
 152
 153 static bool
 154 brw_codegen_tcs_prog(struct brw_context *brw, struct brw_program *tcp,
 155                      struct brw_program *tep, struct brw_tcs_prog_key *key)
 156 {
 157    struct gl_context *ctx = &brw->ctx;
 158    const struct brw_compiler *compiler = brw->screen->compiler;
 159    const struct gen_device_info *devinfo = compiler->devinfo;
 160    struct brw_stage_state *stage_state = &brw->tcs.base;
 161    nir_shader *nir;
 162    struct brw_tcs_prog_data prog_data;
 163    bool start_busy = false;
 164    double start_time = 0;
 165
 166    void *mem_ctx = ralloc_context(NULL);
 167    if (tcp) {
 168       nir = tcp->program.nir;
 169    } else {
 170       /* Create a dummy nir_shader.  We won't actually use NIR code to
 171        * generate assembly (it's easier to generate assembly directly),
 172        * but the whole compiler assumes one of these exists.
 173        */
 174       const nir_shader_compiler_options *options =
 175          ctx->Const.ShaderCompilerOptions[MESA_SHADER_TESS_CTRL].NirOptions;
 176       nir = create_passthrough_tcs(mem_ctx, compiler, options, key);
 177    }
 178
 179    memset(&prog_data, 0, sizeof(prog_data));
 180
 181    /* Allocate the references to the uniforms that will end up in the
 182     * prog_data associated with the compiled program, and which will be freed
 183     * by the state cache.
 184     *
 185     * Note: param_count needs to be num_uniform_components * 4, since we add
 186     * padding around uniform values below vec4 size, so the worst case is that
 187     * every uniform is a float which gets padded to the size of a vec4.
 188     */
 189    int param_count = nir->num_uniforms / 4;
 190
 191    prog_data.base.base.param = rzalloc_array(NULL, uint32_t, param_count);
 192    prog_data.base.base.pull_param = rzalloc_array(NULL, uint32_t, param_count);
 193    prog_data.base.base.nr_params = param_count;
 194
 195    if (tcp) {
 196       brw_assign_common_binding_table_offsets(devinfo, &tcp->program,
 197                                               &prog_data.base.base, 0);
 198
 199       brw_nir_setup_glsl_uniforms(nir, &tcp->program, &prog_data.base.base,
 200                                   compiler->scalar_stage[MESA_SHADER_TESS_CTRL]);
 201       brw_nir_analyze_ubo_ranges(compiler, tcp->program.nir,
 202                                  prog_data.base.base.ubo_ranges);
 203    } else {
 204       /* Upload the Patch URB Header as the first two uniforms.
 205        * Do the annoying scrambling so the shader doesn't have to.
 206        */
 207       uint32_t *param = prog_data.base.base.param;
 208       for (int i = 0; i < 8; i++)
 209          param[i] = BRW_PARAM_BUILTIN_ZERO;
 210
 211       if (key->tes_primitive_mode == GL_QUADS) {
 212          for (int i = 0; i < 4; i++)
 213             param[7 - i] = BRW_PARAM_BUILTIN_TESS_LEVEL_OUTER_X + i;
 214
 215          param[3] = BRW_PARAM_BUILTIN_TESS_LEVEL_INNER_X;
 216          param[2] = BRW_PARAM_BUILTIN_TESS_LEVEL_INNER_Y;
 217       } else if (key->tes_primitive_mode == GL_TRIANGLES) {
 218          for (int i = 0; i < 3; i++)
 219             param[7 - i] = BRW_PARAM_BUILTIN_TESS_LEVEL_OUTER_X + i;
 220
 221          param[4] = BRW_PARAM_BUILTIN_TESS_LEVEL_INNER_X;
 222       } else {
 223          assert(key->tes_primitive_mode == GL_ISOLINES);
 224          param[7] = BRW_PARAM_BUILTIN_TESS_LEVEL_OUTER_Y;
 225          param[6] = BRW_PARAM_BUILTIN_TESS_LEVEL_OUTER_X;
 226       }
 227    }
 228
 229    int st_index = -1;
 230    if (unlikely((INTEL_DEBUG & DEBUG_SHADER_TIME) && tep))
 231       st_index = brw_get_shader_time_index(brw, &tep->program, ST_TCS, true);
 232
 233    if (unlikely(brw->perf_debug)) {
 234       start_busy = brw->batch.last_bo && brw_bo_busy(brw->batch.last_bo);
 235       start_time = get_time();
 236    }
 237
 238    unsigned program_size;
 239    char *error_str;
 240    const unsigned *program =
 241       brw_compile_tcs(compiler, brw, mem_ctx, key, &prog_data, nir, st_index,
 242                       &program_size, &error_str);
 243    if (program == NULL) {
 244       if (tep) {
 245          tep->program.sh.data->LinkStatus = linking_failure;
 246          ralloc_strcat(&tep->program.sh.data->InfoLog, error_str);
 247       }
 248
 249       _mesa_problem(NULL, "Failed to compile tessellation control shader: "
 250                     "%s\n", error_str);
 251
 252       ralloc_free(mem_ctx);
 253       return false;
 254    }
 255
 256    if (unlikely(brw->perf_debug)) {
 257       if (tcp) {
 258          if (tcp->compiled_once) {
 259             brw_tcs_debug_recompile(brw, &tcp->program, key);
 260          }
 261          tcp->compiled_once = true;
 262       }
 263
 264       if (start_busy && !brw_bo_busy(brw->batch.last_bo)) {
 265          perf_debug("TCS compile took %.03f ms and stalled the GPU\n",
 266                     (get_time() - start_time) * 1000);
 267       }
 268    }
 269
 270    /* Scratch space is used for register spilling */
 271    brw_alloc_stage_scratch(brw, stage_state,
 272                            prog_data.base.base.total_scratch,
 273                            devinfo->max_tcs_threads);
 274
 275    brw_upload_cache(&brw->cache, BRW_CACHE_TCS_PROG,
 276                     key, sizeof(*key),
 277                     program, program_size,
 278                     &prog_data, sizeof(prog_data),
 279                     &stage_state->prog_offset, &brw->tcs.base.prog_data);
 280    ralloc_free(mem_ctx);
 281
 282    return true;
 283 }
 284
 285 void
 286 brw_tcs_populate_key(struct brw_context *brw,
 287                      struct brw_tcs_prog_key *key)
 288 {
 289    const struct gen_device_info *devinfo = &brw->screen->devinfo;
 290    struct brw_program *tcp =
 291       (struct brw_program *) brw->programs[MESA_SHADER_TESS_CTRL];
 292    struct brw_program *tep =
 293       (struct brw_program *) brw->programs[MESA_SHADER_TESS_EVAL];
 294    struct gl_program *tes_prog = &tep->program;
 295
 296    uint64_t per_vertex_slots = tes_prog->info.inputs_read;
 297    uint32_t per_patch_slots = tes_prog->info.patch_inputs_read;
 298
 299    memset(key, 0, sizeof(*key));
 300
 301    if (tcp) {
 302       struct gl_program *prog = &tcp->program;
 303       per_vertex_slots |= prog->info.outputs_written;
 304       per_patch_slots |= prog->info.patch_outputs_written;
 305    }
 306
 307    if (devinfo->gen < 8 || !tcp)
 308       key->input_vertices = brw->ctx.TessCtrlProgram.patch_vertices;
 309    key->outputs_written = per_vertex_slots;
 310    key->patch_outputs_written = per_patch_slots;
 311
 312    /* We need to specialize our code generation for tessellation levels
 313     * based on the domain the DS is expecting to tessellate.
 314     */
 315    key->tes_primitive_mode = tep->program.info.tess.primitive_mode;
 316    key->quads_workaround = devinfo->gen < 9 &&
 317                            tep->program.info.tess.primitive_mode == GL_QUADS &&
 318                            tep->program.info.tess.spacing == TESS_SPACING_EQUAL;
 319
 320    if (tcp) {
 321       key->program_string_id = tcp->id;
 322
 323       /* _NEW_TEXTURE */
 324       brw_populate_sampler_prog_key_data(&brw->ctx, &tcp->program, &key->tex);
 325    }
 326 }
 327
 328 void
 329 brw_upload_tcs_prog(struct brw_context *brw)
 330 {
 331    struct brw_stage_state *stage_state = &brw->tcs.base;
 332    struct brw_tcs_prog_key key;
 333    /* BRW_NEW_TESS_PROGRAMS */
 334    struct brw_program *tcp =
 335       (struct brw_program *) brw->programs[MESA_SHADER_TESS_CTRL];
 336    MAYBE_UNUSED struct brw_program *tep =
 337       (struct brw_program *) brw->programs[MESA_SHADER_TESS_EVAL];
 338    assert(tep);
 339
 340    if (!brw_state_dirty(brw,
 341                         _NEW_TEXTURE,
 342                         BRW_NEW_PATCH_PRIMITIVE |
 343                         BRW_NEW_TESS_PROGRAMS))
 344       return;
 345
 346    brw_tcs_populate_key(brw, &key);
 347
 348    if (!brw_search_cache(&brw->cache, BRW_CACHE_TCS_PROG,
 349                          &key, sizeof(key),
 350                          &stage_state->prog_offset,
 351                          &brw->tcs.base.prog_data)) {
 352       bool success = brw_codegen_tcs_prog(brw, tcp, tep, &key);
 353       assert(success);
 354       (void)success;
 355    }
 356 }
 357
 358
 359 bool
 360 brw_tcs_precompile(struct gl_context *ctx,
 361                    struct gl_shader_program *shader_prog,
 362                    struct gl_program *prog)
 363 {
 364    struct brw_context *brw = brw_context(ctx);
 365    struct brw_tcs_prog_key key;
 366    uint32_t old_prog_offset = brw->tcs.base.prog_offset;
 367    struct brw_stage_prog_data *old_prog_data = brw->tcs.base.prog_data;
 368    bool success;
 369
 370    struct brw_program *btcp = brw_program(prog);
 371    const struct gl_linked_shader *tes =
 372       shader_prog->_LinkedShaders[MESA_SHADER_TESS_EVAL];
 373    const struct gen_device_info *devinfo = &brw->screen->devinfo;
 374
 375    memset(&key, 0, sizeof(key));
 376
 377    key.program_string_id = btcp->id;
 378    brw_setup_tex_for_precompile(brw, &key.tex, prog);
 379
 380    /* Guess that the input and output patches have the same dimensionality. */
 381    if (devinfo->gen < 8)
 382       key.input_vertices = prog->info.tess.tcs_vertices_out;
 383
 384    struct brw_program *btep;
 385    if (tes) {
 386       btep = brw_program(tes->Program);
 387       key.tes_primitive_mode = tes->Program->info.tess.primitive_mode;
 388       key.quads_workaround = devinfo->gen < 9 &&
 389                              tes->Program->info.tess.primitive_mode == GL_QUADS &&
 390                              tes->Program->info.tess.spacing == TESS_SPACING_EQUAL;
 391    } else {
 392       btep = NULL;
 393       key.tes_primitive_mode = GL_TRIANGLES;
 394    }
 395
 396    key.outputs_written = prog->nir->info.outputs_written;
 397    key.patch_outputs_written = prog->nir->info.patch_outputs_written;
 398
 399    success = brw_codegen_tcs_prog(brw, btcp, btep, &key);
 400
 401    brw->tcs.base.prog_offset = old_prog_offset;
 402    brw->tcs.base.prog_data = old_prog_data;
 403
 404    return success;
 405 }