src/mesa/main/glspirv.c

   1 /*
   2  * Copyright 2017 Advanced Micro Devices, Inc.
   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  * on the rights to use, copy, modify, merge, publish, distribute, sub
   8  * license, and/or sell copies of the Software, and to permit persons to whom
   9  * the 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 NON-INFRINGEMENT. IN NO EVENT SHALL
  18  * THE AUTHOR(S) AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
  19  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  20  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  21  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  22  */
  23
  24 #include "glspirv.h"
  25 #include "errors.h"
  26 #include "shaderobj.h"
  27 #include "mtypes.h"
  28
  29 #include "compiler/nir/nir.h"
  30 #include "compiler/spirv/nir_spirv.h"
  31
  32 #include "program/program.h"
  33
  34 #include "util/u_atomic.h"
  35
  36 void
  37 _mesa_spirv_module_reference(struct gl_spirv_module **dest,
  38                              struct gl_spirv_module *src)
  39 {
  40    struct gl_spirv_module *old = *dest;
  41
  42    if (old && p_atomic_dec_zero(&old->RefCount))
  43       free(old);
  44
  45    *dest = src;
  46
  47    if (src)
  48       p_atomic_inc(&src->RefCount);
  49 }
  50
  51 void
  52 _mesa_shader_spirv_data_reference(struct gl_shader_spirv_data **dest,
  53                                   struct gl_shader_spirv_data *src)
  54 {
  55    struct gl_shader_spirv_data *old = *dest;
  56
  57    if (old && p_atomic_dec_zero(&old->RefCount)) {
  58       _mesa_spirv_module_reference(&(*dest)->SpirVModule, NULL);
  59       ralloc_free(old);
  60    }
  61
  62    *dest = src;
  63
  64    if (src)
  65       p_atomic_inc(&src->RefCount);
  66 }
  67
  68 void
  69 _mesa_spirv_shader_binary(struct gl_context *ctx,
  70                           unsigned n, struct gl_shader **shaders,
  71                           const void* binary, size_t length)
  72 {
  73    struct gl_spirv_module *module;
  74    struct gl_shader_spirv_data *spirv_data;
  75
  76    assert(length >= 0);
  77
  78    module = malloc(sizeof(*module) + length);
  79    if (!module) {
  80       _mesa_error(ctx, GL_OUT_OF_MEMORY, "glShaderBinary");
  81       return;
  82    }
  83
  84    p_atomic_set(&module->RefCount, 0);
  85    module->Length = length;
  86    memcpy(&module->Binary[0], binary, length);
  87
  88    for (int i = 0; i < n; ++i) {
  89       struct gl_shader *sh = shaders[i];
  90
  91       spirv_data = rzalloc(NULL, struct gl_shader_spirv_data);
  92       _mesa_shader_spirv_data_reference(&sh->spirv_data, spirv_data);
  93       _mesa_spirv_module_reference(&spirv_data->SpirVModule, module);
  94
  95       sh->CompileStatus = COMPILE_FAILURE;
  96
  97       free((void *)sh->Source);
  98       sh->Source = NULL;
  99       free((void *)sh->FallbackSource);
 100       sh->FallbackSource = NULL;
 101
 102       ralloc_free(sh->ir);
 103       sh->ir = NULL;
 104       ralloc_free(sh->symbols);
 105       sh->symbols = NULL;
 106    }
 107 }
 108
 109 /**
 110  * This is the equivalent to compiler/glsl/linker.cpp::link_shaders()
 111  * but for SPIR-V programs.
 112  *
 113  * This method just creates the gl_linked_shader structs with a reference to
 114  * the SPIR-V data collected during previous steps.
 115  *
 116  * The real linking happens later in the driver-specifc call LinkShader().
 117  * This is so backends can implement different linking strategies for
 118  * SPIR-V programs.
 119  */
 120 void
 121 _mesa_spirv_link_shaders(struct gl_context *ctx, struct gl_shader_program *prog)
 122 {
 123    prog->data->LinkStatus = LINKING_SUCCESS;
 124    prog->data->Validated = false;
 125
 126    for (unsigned i = 0; i < prog->NumShaders; i++) {
 127       struct gl_shader *shader = prog->Shaders[i];
 128       gl_shader_stage shader_type = shader->Stage;
 129
 130       /* We only support one shader per stage. The gl_spirv spec doesn't seem
 131        * to prevent this, but the way the API is designed, requiring all shaders
 132        * to be specialized with an entry point, makes supporting this quite
 133        * undefined.
 134        *
 135        * TODO: Turn this into a proper error once the spec bug
 136        * <https://gitlab.khronos.org/opengl/API/issues/58> is resolved.
 137        */
 138       if (prog->_LinkedShaders[shader_type]) {
 139          ralloc_strcat(&prog->data->InfoLog,
 140                        "\nError trying to link more than one SPIR-V shader "
 141                        "per stage.\n");
 142          prog->data->LinkStatus = LINKING_FAILURE;
 143          return;
 144       }
 145
 146       assert(shader->spirv_data);
 147
 148       struct gl_linked_shader *linked = rzalloc(NULL, struct gl_linked_shader);
 149       linked->Stage = shader_type;
 150
 151       /* Create program and attach it to the linked shader */
 152       struct gl_program *gl_prog =
 153          ctx->Driver.NewProgram(ctx,
 154                                 _mesa_shader_stage_to_program(shader_type),
 155                                 prog->Name, false);
 156       if (!gl_prog) {
 157          prog->data->LinkStatus = LINKING_FAILURE;
 158          _mesa_delete_linked_shader(ctx, linked);
 159          return;
 160       }
 161
 162       _mesa_reference_shader_program_data(ctx,
 163                                           &gl_prog->sh.data,
 164                                           prog->data);
 165
 166       /* Don't use _mesa_reference_program() just take ownership */
 167       linked->Program = gl_prog;
 168
 169       /* Reference the SPIR-V data from shader to the linked shader */
 170       _mesa_shader_spirv_data_reference(&linked->spirv_data,
 171                                         shader->spirv_data);
 172
 173       prog->_LinkedShaders[shader_type] = linked;
 174       prog->data->linked_stages |= 1 << shader_type;
 175    }
 176
 177    int last_vert_stage =
 178       util_last_bit(prog->data->linked_stages &
 179                     ((1 << (MESA_SHADER_GEOMETRY + 1)) - 1));
 180
 181    if (last_vert_stage)
 182       prog->last_vert_prog = prog->_LinkedShaders[last_vert_stage - 1]->Program;
 183 }
 184
 185 static void
 186 nir_compute_double_inputs(nir_shader *shader,
 187                           const nir_shader_compiler_options *options)
 188 {
 189    nir_foreach_variable(var, &shader->inputs) {
 190       if (glsl_type_is_dual_slot(glsl_without_array(var->type))) {
 191          for (uint i = 0; i < glsl_count_attribute_slots(var->type, true); i++) {
 192             uint64_t bitfield = BITFIELD64_BIT(var->data.location + i);
 193             shader->info.vs.double_inputs |= bitfield;
 194          }
 195       }
 196    }
 197 }
 198
 199 nir_shader *
 200 _mesa_spirv_to_nir(struct gl_context *ctx,
 201                    const struct gl_shader_program *prog,
 202                    gl_shader_stage stage,
 203                    const nir_shader_compiler_options *options)
 204 {
 205    nir_shader *nir = NULL;
 206
 207    struct gl_linked_shader *linked_shader = prog->_LinkedShaders[stage];
 208    assert (linked_shader);
 209
 210    struct gl_shader_spirv_data *spirv_data = linked_shader->spirv_data;
 211    assert(spirv_data);
 212
 213    struct gl_spirv_module *spirv_module = spirv_data->SpirVModule;
 214    assert (spirv_module != NULL);
 215
 216    const char *entry_point_name = spirv_data->SpirVEntryPoint;
 217    assert(entry_point_name);
 218
 219    struct nir_spirv_specialization *spec_entries =
 220       calloc(sizeof(*spec_entries),
 221              spirv_data->NumSpecializationConstants);
 222
 223    for (unsigned i = 0; i < spirv_data->NumSpecializationConstants; ++i) {
 224       spec_entries[i].id = spirv_data->SpecializationConstantsIndex[i];
 225       spec_entries[i].data32 = spirv_data->SpecializationConstantsValue[i];
 226       spec_entries[i].defined_on_module = false;
 227    }
 228
 229    const struct spirv_to_nir_options spirv_options = {
 230       .lower_workgroup_access_to_offsets = true,
 231       .caps = ctx->Const.SpirVCapabilities
 232    };
 233
 234    nir_function *entry_point =
 235       spirv_to_nir((const uint32_t *) &spirv_module->Binary[0],
 236                    spirv_module->Length / 4,
 237                    spec_entries, spirv_data->NumSpecializationConstants,
 238                    stage, entry_point_name,
 239                    &spirv_options,
 240                    options);
 241    free(spec_entries);
 242
 243    assert (entry_point);
 244    nir = entry_point->shader;
 245    assert(nir->info.stage == stage);
 246
 247    nir->options = options;
 248
 249    nir->info.name =
 250       ralloc_asprintf(nir, "SPIRV:%s:%d",
 251                       _mesa_shader_stage_to_abbrev(nir->info.stage),
 252                       prog->Name);
 253    nir_validate_shader(nir);
 254
 255    /* We have to lower away local constant initializers right before we
 256     * inline functions.  That way they get properly initialized at the top
 257     * of the function and not at the top of its caller.
 258     */
 259    NIR_PASS_V(nir, nir_lower_constant_initializers, nir_var_local);
 260    NIR_PASS_V(nir, nir_lower_returns);
 261    NIR_PASS_V(nir, nir_inline_functions);
 262    NIR_PASS_V(nir, nir_copy_prop);
 263
 264    /* Pick off the single entrypoint that we want */
 265    foreach_list_typed_safe(nir_function, func, node, &nir->functions) {
 266       if (func != entry_point)
 267          exec_node_remove(&func->node);
 268    }
 269    assert(exec_list_length(&nir->functions) == 1);
 270    entry_point->name = ralloc_strdup(entry_point, "main");
 271
 272    /* Split member structs.  We do this before lower_io_to_temporaries so that
 273     * it doesn't lower system values to temporaries by accident.
 274     */
 275    NIR_PASS_V(nir, nir_split_var_copies);
 276    NIR_PASS_V(nir, nir_split_per_member_structs);
 277
 278    if (nir->info.stage == MESA_SHADER_VERTEX) {
 279       nir_compute_double_inputs(nir, options);
 280       nir_remap_attributes(nir, options);
 281    }
 282
 283    return nir;
 284 }
 285
 286 void GLAPIENTRY
 287 _mesa_SpecializeShaderARB(GLuint shader,
 288                           const GLchar *pEntryPoint,
 289                           GLuint numSpecializationConstants,
 290                           const GLuint *pConstantIndex,
 291                           const GLuint *pConstantValue)
 292 {
 293    GET_CURRENT_CONTEXT(ctx);
 294    struct gl_shader *sh;
 295    bool has_entry_point;
 296    struct nir_spirv_specialization *spec_entries = NULL;
 297
 298    if (!ctx->Extensions.ARB_gl_spirv) {
 299       _mesa_error(ctx, GL_INVALID_OPERATION, "glSpecializeShaderARB");
 300       return;
 301    }
 302
 303    sh = _mesa_lookup_shader_err(ctx, shader, "glSpecializeShaderARB");
 304    if (!sh)
 305       return;
 306
 307    if (!sh->spirv_data) {
 308       _mesa_error(ctx, GL_INVALID_OPERATION,
 309                   "glSpecializeShaderARB(not SPIR-V)");
 310       return;
 311    }
 312
 313    if (sh->CompileStatus) {
 314       _mesa_error(ctx, GL_INVALID_OPERATION,
 315                   "glSpecializeShaderARB(already specialized)");
 316       return;
 317    }
 318
 319    struct gl_shader_spirv_data *spirv_data = sh->spirv_data;
 320
 321    /* From the GL_ARB_gl_spirv spec:
 322     *
 323     *    "The OpenGL API expects the SPIR-V module to have already been
 324     *     validated, and can return an error if it discovers anything invalid
 325     *     in the module. An invalid SPIR-V module is allowed to result in
 326     *     undefined behavior."
 327     *
 328     * However, the following errors still need to be detected (from the same
 329     * spec):
 330     *
 331     *    "INVALID_VALUE is generated if <pEntryPoint> does not name a valid
 332     *     entry point for <shader>.
 333     *
 334     *     INVALID_VALUE is generated if any element of <pConstantIndex>
 335     *     refers to a specialization constant that does not exist in the
 336     *     shader module contained in <shader>."
 337     *
 338     * We cannot flag those errors a-priori because detecting them requires
 339     * parsing the module. However, flagging them during specialization is okay,
 340     * since it makes no difference in terms of application-visible state.
 341     */
 342    spec_entries = calloc(sizeof(*spec_entries), numSpecializationConstants);
 343
 344    for (unsigned i = 0; i < numSpecializationConstants; ++i) {
 345       spec_entries[i].id = pConstantIndex[i];
 346       spec_entries[i].data32 = pConstantValue[i];
 347       spec_entries[i].defined_on_module = false;
 348    }
 349
 350    has_entry_point =
 351       gl_spirv_validation((uint32_t *)&spirv_data->SpirVModule->Binary[0],
 352                           spirv_data->SpirVModule->Length / 4,
 353                           spec_entries, numSpecializationConstants,
 354                           sh->Stage, pEntryPoint);
 355
 356    /* See previous spec comment */
 357    if (!has_entry_point) {
 358       _mesa_error(ctx, GL_INVALID_VALUE,
 359                   "glSpecializeShaderARB(\"%s\" is not a valid entry point"
 360                   " for shader)", pEntryPoint);
 361       goto end;
 362    }
 363
 364    for (unsigned i = 0; i < numSpecializationConstants; ++i) {
 365       if (spec_entries[i].defined_on_module == false) {
 366          _mesa_error(ctx, GL_INVALID_VALUE,
 367                      "glSpecializeShaderARB(constant \"%i\" does not exist "
 368                      "in shader)", spec_entries[i].id);
 369          goto end;
 370       }
 371    }
 372
 373    spirv_data->SpirVEntryPoint = ralloc_strdup(spirv_data, pEntryPoint);
 374
 375    /* Note that we didn't make a real compilation of the module (spirv_to_nir),
 376     * but just checked some error conditions. Real "compilation" will be done
 377     * later, upon linking.
 378     */
 379    sh->CompileStatus = COMPILE_SUCCESS;
 380
 381    spirv_data->NumSpecializationConstants = numSpecializationConstants;
 382    spirv_data->SpecializationConstantsIndex =
 383       rzalloc_array_size(spirv_data, sizeof(GLuint),
 384                          numSpecializationConstants);
 385    spirv_data->SpecializationConstantsValue =
 386       rzalloc_array_size(spirv_data, sizeof(GLuint),
 387                          numSpecializationConstants);
 388    for (unsigned i = 0; i < numSpecializationConstants; ++i) {
 389       spirv_data->SpecializationConstantsIndex[i] = pConstantIndex[i];
 390       spirv_data->SpecializationConstantsValue[i] = pConstantValue[i];
 391    }
 392
 393  end:
 394    free(spec_entries);
 395 }