source/backends/opengl/program_backend.cpp

   1 #include <cstring>
   2 #include <msp/core/algorithm.h>
   3 #include <msp/gl/extensions/arb_es2_compatibility.h>
   4 #include <msp/gl/extensions/arb_fragment_shader.h>
   5 #include <msp/gl/extensions/arb_gl_spirv.h>
   6 #include <msp/gl/extensions/arb_geometry_shader4.h>
   7 #include <msp/gl/extensions/arb_separate_shader_objects.h>
   8 #include <msp/gl/extensions/arb_shader_objects.h>
   9 #include <msp/gl/extensions/arb_uniform_buffer_object.h>
  10 #include <msp/gl/extensions/arb_vertex_shader.h>
  11 #include <msp/gl/extensions/ext_gpu_shader4.h>
  12 #include <msp/gl/extensions/khr_debug.h>
  13 #include <msp/gl/extensions/nv_non_square_matrices.h>
  14 #include <msp/io/print.h>
  15 #include "device.h"
  16 #include "error.h"
  17 #include "program.h"
  18 #include "program_backend.h"
  19 #include "glsl/compiler.h"
  20
  21 using namespace std;
  22
  23 namespace {
  24
  25 template<typename T, void (*&func)(GLint, GLsizei, const T *)>
  26 void uniform_wrapper(unsigned index, unsigned count, const void *data)
  27 {
  28         func(index, count, static_cast<const T *>(data));
  29 }
  30
  31 template<typename T, void (*&func)(GLint, GLsizei, GLboolean, const T *)>
  32 void uniform_matrix_wrapper(unsigned index, unsigned count, const void *data)
  33 {
  34         func(index, count, false, static_cast<const T *>(data));
  35 }
  36
  37 }
  38
  39 namespace Msp {
  40 namespace GL {
  41
  42 OpenGLProgram::OpenGLProgram()
  43 {
  44         static Require _req(ARB_shader_objects);
  45
  46         id = glCreateProgram();
  47 }
  48
  49 OpenGLProgram::OpenGLProgram(OpenGLProgram &&other):
  50         id(other.id),
  51         linked(other.linked),
  52         uniform_calls(move(other.uniform_calls)),
  53         debug_name(move(other.debug_name))
  54 {
  55         move(other.stage_ids, other.stage_ids+MAX_STAGES, stage_ids);
  56         other.id = 0;
  57         fill(other.stage_ids, other.stage_ids+MAX_STAGES, 0);
  58 }
  59
  60 OpenGLProgram::~OpenGLProgram()
  61 {
  62         for(unsigned i=0; i<MAX_STAGES; ++i)
  63                 if(stage_ids[i])
  64                         glDeleteShader(stage_ids[i]);
  65         glDeleteProgram(id);
  66 }
  67
  68 bool OpenGLProgram::has_stages() const
  69 {
  70         for(unsigned i=0; i<MAX_STAGES; ++i)
  71                 if(stage_ids[i])
  72                         return true;
  73         return false;
  74 }
  75
  76 unsigned OpenGLProgram::add_stage(Stage type)
  77 {
  78         GLenum gl_type;
  79         switch(type)
  80         {
  81         case VERTEX: { static Require _req(ARB_vertex_shader); gl_type = GL_VERTEX_SHADER; } break;
  82         case GEOMETRY: { static Require _req(ARB_geometry_shader4); gl_type = GL_GEOMETRY_SHADER; } break;
  83         case FRAGMENT: { static Require _req(ARB_fragment_shader); gl_type = GL_FRAGMENT_SHADER; } break;
  84         default: throw invalid_argument("OpenGLProgram::add_stage");
  85         }
  86
  87         if(stage_ids[type])
  88                 throw invalid_operation("OpenGLProgram::add_stage");
  89
  90         unsigned stage_id = glCreateShader(gl_type);
  91         stage_ids[type] = stage_id;
  92         glAttachShader(id, stage_id);
  93
  94 #ifdef DEBUG
  95         if(!debug_name.empty() && KHR_debug)
  96                 set_stage_debug_name(stage_id, type);
  97 #endif
  98
  99         return stage_id;
 100 }
 101
 102 void OpenGLProgram::add_glsl_stages(const GlslModule &mod, const map<string, int> &spec_values)
 103 {
 104         SL::Compiler compiler(Device::get_current().get_info().glsl_features);
 105         compiler.set_source(mod.get_prepared_source(), "<module>");
 106         compiler.specialize(spec_values);
 107         compiler.compile(SL::Compiler::PROGRAM);
 108 #ifdef DEBUG
 109         string diagnostics = compiler.get_diagnostics();
 110         if(!diagnostics.empty())
 111                 IO::print("Program diagnostics:\n%s\n", diagnostics);
 112 #endif
 113
 114         vector<SL::Stage::Type> stages = compiler.get_stages();
 115         if(stages.empty())
 116                 throw invalid_argument("OpenGLProgram::add_glsl_stages");
 117
 118         for(SL::Stage::Type st: stages)
 119         {
 120                 unsigned stage_id = 0;
 121                 switch(st)
 122                 {
 123                 case SL::Stage::VERTEX: stage_id = add_stage(VERTEX); break;
 124                 case SL::Stage::GEOMETRY: stage_id = add_stage(GEOMETRY); break;
 125                 case SL::Stage::FRAGMENT: stage_id = add_stage(FRAGMENT); break;
 126                 default: throw invalid_operation("OpenGLProgram::add_glsl_stages");
 127                 }
 128
 129                 string stage_src = compiler.get_stage_glsl(st);
 130                 const char *src_ptr = stage_src.data();
 131                 int src_len = stage_src.size();
 132                 glShaderSource(stage_id, 1, &src_ptr, &src_len);
 133
 134                 if(st==SL::Stage::VERTEX)
 135                 {
 136                         for(const auto &kvp: compiler.get_vertex_attributes())
 137                                 glBindAttribLocation(id, kvp.second, kvp.first.c_str());
 138                 }
 139
 140                 if(st==SL::Stage::FRAGMENT && EXT_gpu_shader4)
 141                 {
 142                         for(const auto &kvp: compiler.get_fragment_outputs())
 143                                 glBindFragDataLocation(id, kvp.second, kvp.first.c_str());
 144                 }
 145
 146                 compile_glsl_stage(mod, stage_id);
 147         }
 148
 149         ReflectData &rd = static_cast<Program *>(this)->reflect_data;
 150         rd.n_clip_distances = compiler.get_n_clip_distances();
 151
 152         link(mod);
 153         query_uniforms();
 154         query_attributes();
 155
 156         const map<string, unsigned> &block_bindings = compiler.get_uniform_block_bindings();
 157         if(!block_bindings.empty())
 158         {
 159                 for(unsigned i=0; i<rd.uniform_blocks.size(); ++i)
 160                 {
 161                         auto j = block_bindings.find(rd.uniform_blocks[i].name);
 162                         if(j!=block_bindings.end())
 163                         {
 164                                 glUniformBlockBinding(id, i, j->second);
 165                                 rd.uniform_blocks[i].bind_point = j->second;
 166                         }
 167                 }
 168         }
 169
 170         const map<string, unsigned> &tex_bindings = compiler.get_texture_bindings();
 171         if(!tex_bindings.empty())
 172         {
 173                 if(!ARB_separate_shader_objects)
 174                         glUseProgram(id);
 175                 for(const auto &kvp: tex_bindings)
 176                 {
 177                         int location = static_cast<const Program *>(this)->get_uniform_location(kvp.first);
 178                         if(location>=0)
 179                         {
 180                                 if(ARB_separate_shader_objects)
 181                                         glProgramUniform1i(id, location, kvp.second);
 182                                 else
 183                                         glUniform1i(location, kvp.second);
 184                         }
 185                 }
 186         }
 187 }
 188
 189 void OpenGLProgram::compile_glsl_stage(const GlslModule &mod, unsigned stage_id)
 190 {
 191         glCompileShader(stage_id);
 192         int status = 0;
 193         glGetShaderiv(stage_id, GL_COMPILE_STATUS, &status);
 194
 195         int info_log_len = 0;
 196         glGetShaderiv(stage_id, GL_INFO_LOG_LENGTH, &info_log_len);
 197         string info_log(info_log_len+1, 0);
 198         glGetShaderInfoLog(stage_id, info_log_len+1, &info_log_len, &info_log[0]);
 199         info_log.erase(info_log_len);
 200         info_log = mod.get_source_map().translate_errors(info_log);
 201
 202         if(!status)
 203                 throw compile_error(info_log);
 204 #ifdef DEBUG
 205         if(!info_log.empty())
 206                 IO::print("Shader compile info log:\n%s", info_log);
 207 #endif
 208 }
 209
 210 void OpenGLProgram::add_spirv_stages(const SpirVModule &mod, const map<string, int> &spec_values)
 211 {
 212         static Require _req(ARB_gl_spirv);
 213         static Require _req2(ARB_ES2_compatibility);
 214
 215         unsigned n_stages = 0;
 216         unsigned used_stage_ids[MAX_STAGES];
 217         for(const SpirVModule::EntryPoint &e: mod.get_entry_points())
 218         {
 219                 unsigned stage_id = 0;
 220                 switch(e.stage)
 221                 {
 222                 case SpirVModule::VERTEX: stage_id = add_stage(VERTEX); break;
 223                 case SpirVModule::GEOMETRY: stage_id = add_stage(GEOMETRY); break;
 224                 case SpirVModule::FRAGMENT: stage_id = add_stage(FRAGMENT); break;
 225                 default: throw invalid_operation("OpenGLProgram::add_spirv_stages");
 226                 }
 227
 228                 used_stage_ids[n_stages++] = stage_id;
 229         }
 230
 231         if(!n_stages)
 232                 throw invalid_argument("OpenGLProgram::add_spirv_stages");
 233
 234         const vector<uint32_t> &code = mod.get_code();
 235         glShaderBinary(n_stages, used_stage_ids, GL_SHADER_BINARY_FORMAT_SPIR_V, &code[0], code.size()*4);
 236
 237         const vector<SpirVModule::Constant> &spec_consts = mod.get_spec_constants();
 238         vector<unsigned> spec_id_array;
 239         vector<unsigned> spec_value_array;
 240         spec_id_array.reserve(spec_consts.size());
 241         spec_value_array.reserve(spec_consts.size());
 242         for(const SpirVModule::Constant &c: spec_consts)
 243         {
 244                 auto i = spec_values.find(c.name);
 245                 if(i!=spec_values.end())
 246                 {
 247                         spec_id_array.push_back(c.constant_id);
 248                         spec_value_array.push_back(i->second);
 249                 }
 250         }
 251
 252         auto j = mod.get_entry_points().begin();
 253         for(unsigned i=0; i<MAX_STAGES; ++i)
 254                 if(stage_ids[i])
 255                         glSpecializeShader(stage_ids[i], j->name.c_str(), spec_id_array.size(), &spec_id_array[0], &spec_value_array[0]);
 256
 257         link(mod);
 258 }
 259
 260 void OpenGLProgram::link(const Module &mod)
 261 {
 262         glLinkProgram(id);
 263         int status = 0;
 264         glGetProgramiv(id, GL_LINK_STATUS, &status);
 265         linked = status;
 266
 267         int info_log_len = 0;
 268         glGetProgramiv(id, GL_INFO_LOG_LENGTH, &info_log_len);
 269         string info_log(info_log_len+1, 0);
 270         glGetProgramInfoLog(id, info_log_len+1, &info_log_len, &info_log[0]);
 271         info_log.erase(info_log_len);
 272         if(mod.get_format()==Module::GLSL)
 273                 info_log = static_cast<const GlslModule &>(mod).get_source_map().translate_errors(info_log);
 274
 275         if(!linked)
 276                 throw compile_error(info_log);
 277 #ifdef DEBUG
 278         if(!info_log.empty())
 279                 IO::print("Program link info log:\n%s", info_log);
 280 #endif
 281 }
 282
 283 void OpenGLProgram::query_uniforms()
 284 {
 285         ReflectData &rd = static_cast<Program *>(this)->reflect_data;
 286
 287         unsigned count = 0;
 288         glGetProgramiv(id, GL_ACTIVE_UNIFORMS, reinterpret_cast<int *>(&count));
 289         rd.uniforms.reserve(count);
 290         vector<string> uniform_names(count);
 291         for(unsigned i=0; i<count; ++i)
 292         {
 293                 char name[128];
 294                 int len = 0;
 295                 int size;
 296                 GLenum type;
 297                 glGetActiveUniform(id, i, sizeof(name), &len, &size, &type, name);
 298                 if(len && strncmp(name, "gl_", 3))
 299                 {
 300                         /* Some implementations report the first element of a uniform array,
 301                         others report just the name of the array itself. */
 302                         if(len>3 && !strcmp(name+len-3, "[0]"))
 303                                 name[len-3] = 0;
 304
 305                         rd.uniforms.emplace_back();
 306                         ReflectData::UniformInfo &info = rd.uniforms.back();
 307                         info.name = name;
 308                         info.tag = name;
 309                         info.array_size = size;
 310                         info.type = from_gl_type(type);
 311                         uniform_names[i] = name;
 312                 }
 313         }
 314
 315         sort_member(rd.uniforms, &ReflectData::UniformInfo::tag);
 316
 317         if(ARB_uniform_buffer_object)
 318         {
 319                 vector<ReflectData::UniformInfo *> uniforms_by_index(count);
 320                 for(unsigned i=0; i<count; ++i)
 321                         if(!uniform_names[i].empty())
 322                                 // The element is already known to be present
 323                                 uniforms_by_index[i] = &*lower_bound_member(rd.uniforms, Tag(uniform_names[i]), &ReflectData::UniformInfo::tag);
 324                 query_uniform_blocks(uniforms_by_index);
 325         }
 326
 327         rd.uniform_blocks.emplace_back();
 328         ReflectData::UniformBlockInfo &default_block = rd.uniform_blocks.back();
 329
 330         for(ReflectData::UniformInfo &u: rd.uniforms)
 331                 if(!u.block)
 332                 {
 333                         u.location = glGetUniformLocation(id, u.name.c_str());
 334                         u.block = &default_block;
 335                         u.array_stride = get_type_size(u.type);
 336                         if(is_matrix(u.type))
 337                                 u.matrix_stride = get_type_size(get_matrix_column_type(u.type));
 338                         default_block.uniforms.push_back(&u);
 339
 340                         if(is_image(u.type) && u.location>=0)
 341                                 glGetUniformiv(id, u.location, &u.binding);
 342                 }
 343
 344         default_block.sort_uniforms();
 345         default_block.update_layout_hash();
 346         rd.update_layout_hash();
 347 }
 348
 349 void OpenGLProgram::query_uniform_blocks(const vector<ReflectData::UniformInfo *> &uniforms_by_index)
 350 {
 351         ReflectData &rd = static_cast<Program *>(this)->reflect_data;
 352
 353         unsigned count = 0;
 354         glGetProgramiv(id, GL_ACTIVE_UNIFORM_BLOCKS, reinterpret_cast<int *>(&count));
 355         // Reserve an extra index for the default block
 356         rd.uniform_blocks.reserve(count+1);
 357         for(unsigned i=0; i<count; ++i)
 358         {
 359                 char name[128];
 360                 int len;
 361                 glGetActiveUniformBlockName(id, i, sizeof(name), &len, name);
 362                 rd.uniform_blocks.emplace_back();
 363                 ReflectData::UniformBlockInfo &info = rd.uniform_blocks.back();
 364                 info.name = name;
 365
 366                 int value;
 367                 glGetActiveUniformBlockiv(id, i, GL_UNIFORM_BLOCK_DATA_SIZE, &value);
 368                 info.data_size = value;
 369
 370                 glGetActiveUniformBlockiv(id, i, GL_UNIFORM_BLOCK_BINDING, &value);
 371                 info.bind_point = value;
 372
 373                 glGetActiveUniformBlockiv(id, i, GL_UNIFORM_BLOCK_ACTIVE_UNIFORMS, &value);
 374                 vector<int> indices(value);
 375                 glGetActiveUniformBlockiv(id, i, GL_UNIFORM_BLOCK_ACTIVE_UNIFORM_INDICES, &indices[0]);
 376                 for(int j: indices)
 377                 {
 378                         if(!uniforms_by_index[j])
 379                                 throw logic_error("OpenGLProgram::query_uniform_blocks");
 380                         info.uniforms.push_back(uniforms_by_index[j]);
 381                         uniforms_by_index[j]->block = &info;
 382                 }
 383
 384                 vector<unsigned> query_indices(indices.begin(), indices.end());
 385                 vector<int> values(indices.size());
 386                 glGetActiveUniformsiv(id, query_indices.size(), &query_indices[0], GL_UNIFORM_OFFSET, &values[0]);
 387                 for(unsigned j=0; j<indices.size(); ++j)
 388                         uniforms_by_index[indices[j]]->offset = values[j];
 389
 390                 query_indices.clear();
 391                 for(int j: indices)
 392                         if(uniforms_by_index[j]->array_size>1)
 393                                 query_indices.push_back(j);
 394                 if(!query_indices.empty())
 395                 {
 396                         glGetActiveUniformsiv(id, query_indices.size(), &query_indices[0], GL_UNIFORM_ARRAY_STRIDE, &values[0]);
 397                         for(unsigned j=0; j<query_indices.size(); ++j)
 398                                 uniforms_by_index[query_indices[j]]->array_stride = values[j];
 399                 }
 400
 401                 query_indices.clear();
 402                 for(int j: indices)
 403                 {
 404                         DataType t = uniforms_by_index[j]->type;
 405                         if(is_matrix(t))
 406                                 query_indices.push_back(j);
 407                 }
 408                 if(!query_indices.empty())
 409                 {
 410                         glGetActiveUniformsiv(id, query_indices.size(), &query_indices[0], GL_UNIFORM_MATRIX_STRIDE, &values[0]);
 411                         for(unsigned j=0; j<query_indices.size(); ++j)
 412                                 uniforms_by_index[query_indices[j]]->matrix_stride = values[j];
 413                 }
 414
 415                 info.sort_uniforms();
 416                 info.update_layout_hash();
 417         }
 418 }
 419
 420 void OpenGLProgram::query_attributes()
 421 {
 422         ReflectData &rd = static_cast<Program *>(this)->reflect_data;
 423
 424         unsigned count = 0;
 425         glGetProgramiv(id, GL_ACTIVE_ATTRIBUTES, reinterpret_cast<int *>(&count));
 426         rd.attributes.reserve(count);
 427         for(unsigned i=0; i<count; ++i)
 428         {
 429                 char name[128];
 430                 int len = 0;
 431                 int size;
 432                 GLenum type;
 433                 glGetActiveAttrib(id, i, sizeof(name), &len, &size, &type, name);
 434                 if(len && strncmp(name, "gl_", 3))
 435                 {
 436                         if(len>3 && !strcmp(name+len-3, "[0]"))
 437                                 name[len-3] = 0;
 438
 439                         rd.attributes.emplace_back();
 440                         ReflectData::AttributeInfo &info = rd.attributes.back();
 441                         info.name = name;
 442                         info.location = glGetAttribLocation(id, name);
 443                         info.array_size = size;
 444                         info.type = from_gl_type(type);
 445                 }
 446         }
 447
 448         sort_member(reflect_data.attributes, &ReflectData::AttributeInfo::name);
 449 }
 450
 451 void OpenGLProgram::finalize_uniforms()
 452 {
 453         ReflectData &rd = static_cast<Program *>(this)->reflect_data;
 454
 455         auto i = find_if(rd.uniform_blocks, [](const ReflectData::UniformBlockInfo &b){ return b.bind_point<0; });
 456         if(i!=rd.uniform_blocks.end() && !i->uniforms.empty())
 457         {
 458                 for(const ReflectData::UniformInfo *u: i->uniforms)
 459                         if(u->location>=0)
 460                         {
 461                                 UniformCall::FuncPtr func = 0;
 462                                 if(u->type==FLOAT)
 463                                         func = &uniform_wrapper<float, glUniform1fv>;
 464                                 else if(u->type==FLOAT_VEC2)
 465                                         func = &uniform_wrapper<float, glUniform2fv>;
 466                                 else if(u->type==FLOAT_VEC3)
 467                                         func = &uniform_wrapper<float, glUniform3fv>;
 468                                 else if(u->type==FLOAT_VEC4)
 469                                         func = &uniform_wrapper<float, glUniform4fv>;
 470                                 else if(u->type==INT)
 471                                         func = &uniform_wrapper<int, glUniform1iv>;
 472                                 else if(u->type==INT_VEC2)
 473                                         func = &uniform_wrapper<int, glUniform2iv>;
 474                                 else if(u->type==INT_VEC3)
 475                                         func = &uniform_wrapper<int, glUniform3iv>;
 476                                 else if(u->type==INT_VEC4)
 477                                         func = &uniform_wrapper<int, glUniform4iv>;
 478                                 else if(u->type==UNSIGNED_INT)
 479                                         func = &uniform_wrapper<unsigned, glUniform1uiv>;
 480                                 else if(u->type==UINT_VEC2)
 481                                         func = &uniform_wrapper<unsigned, glUniform2uiv>;
 482                                 else if(u->type==UINT_VEC3)
 483                                         func = &uniform_wrapper<unsigned, glUniform3uiv>;
 484                                 else if(u->type==UINT_VEC4)
 485                                         func = &uniform_wrapper<unsigned, glUniform4uiv>;
 486                                 else if(u->type==FLOAT_MAT2)
 487                                         func = &uniform_matrix_wrapper<float, glUniformMatrix2fv>;
 488                                 else if(u->type==FLOAT_MAT3)
 489                                         func = &uniform_matrix_wrapper<float, glUniformMatrix3fv>;
 490                                 else if(u->type==FLOAT_MAT4)
 491                                         func = &uniform_matrix_wrapper<float, glUniformMatrix4fv>;
 492                                 else if(u->type==FLOAT_MAT2x3)
 493                                         func = &uniform_matrix_wrapper<float, glUniformMatrix2x3fv>;
 494                                 else if(u->type==FLOAT_MAT3x2)
 495                                         func = &uniform_matrix_wrapper<float, glUniformMatrix3x2fv>;
 496                                 else if(u->type==FLOAT_MAT2x4)
 497                                         func = &uniform_matrix_wrapper<float, glUniformMatrix2x4fv>;
 498                                 else if(u->type==FLOAT_MAT4x2)
 499                                         func = &uniform_matrix_wrapper<float, glUniformMatrix4x2fv>;
 500                                 else if(u->type==FLOAT_MAT3x4)
 501                                         func = &uniform_matrix_wrapper<float, glUniformMatrix3x4fv>;
 502                                 else if(u->type==FLOAT_MAT4x3)
 503                                         func = &uniform_matrix_wrapper<float, glUniformMatrix4x3fv>;
 504
 505                                 if(func)
 506                                         uniform_calls.push_back(UniformCall(u->location, u->array_size, func));
 507                         }
 508
 509                 if(i->data_size<=0)
 510                 {
 511                         const ReflectData::UniformInfo &last = *i->uniforms.back();
 512                         i->data_size = last.location*16+last.array_size*get_type_size(last.type);
 513                 }
 514         }
 515 }
 516
 517 void OpenGLProgram::set_debug_name(const string &name)
 518 {
 519 #ifdef DEBUG
 520         debug_name = name;
 521         if(KHR_debug)
 522         {
 523                 glObjectLabel(GL_PROGRAM, id, name.size(), name.c_str());
 524                 for(unsigned i=0; i<MAX_STAGES; ++i)
 525                         if(stage_ids[i])
 526                                 set_stage_debug_name(stage_ids[i], static_cast<Stage>(i));
 527         }
 528 #else
 529         (void)name;
 530 #endif
 531 }
 532
 533 void OpenGLProgram::set_stage_debug_name(unsigned stage_id, Stage type)
 534 {
 535 #ifdef DEBUG
 536         static const char *const suffixes[] = { " [VS]", " [GS]", " [FS]" };
 537         string name = debug_name+suffixes[type];
 538         glObjectLabel(GL_SHADER, stage_id, name.size(), name.c_str());
 539 #else
 540         (void)stage_id; (void)type;
 541 #endif
 542 }
 543
 544 } // namespace GL
 545 } // namespace Msp