gpu/command_buffer/service/context_state.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "gpu/command_buffer/service/context_state.h"
   6
   7 #include <cmath>
   8
   9 #include "gpu/command_buffer/common/gles2_cmd_utils.h"
  10 #include "gpu/command_buffer/service/buffer_manager.h"
  11 #include "gpu/command_buffer/service/error_state.h"
  12 #include "gpu/command_buffer/service/framebuffer_manager.h"
  13 #include "gpu/command_buffer/service/program_manager.h"
  14 #include "gpu/command_buffer/service/renderbuffer_manager.h"
  15 #include "ui/gl/gl_bindings.h"
  16 #include "ui/gl/gl_implementation.h"
  17 #include "ui/gl/gl_version_info.h"
  18
  19 namespace gpu {
  20 namespace gles2 {
  21
  22 namespace {
  23
  24 GLuint Get2dServiceId(const TextureUnit& unit) {
  25   return unit.bound_texture_2d.get()
  26       ? unit.bound_texture_2d->service_id() : 0;
  27 }
  28
  29 GLuint GetCubeServiceId(const TextureUnit& unit) {
  30   return unit.bound_texture_cube_map.get()
  31       ? unit.bound_texture_cube_map->service_id() : 0;
  32 }
  33
  34 GLuint GetOesServiceId(const TextureUnit& unit) {
  35   return unit.bound_texture_external_oes.get()
  36       ? unit.bound_texture_external_oes->service_id() : 0;
  37 }
  38
  39 GLuint GetArbServiceId(const TextureUnit& unit) {
  40   return unit.bound_texture_rectangle_arb.get()
  41       ? unit.bound_texture_rectangle_arb->service_id() : 0;
  42 }
  43
  44 GLuint GetServiceId(const TextureUnit& unit, GLuint target) {
  45   switch (target) {
  46     case GL_TEXTURE_2D:
  47       return Get2dServiceId(unit);
  48     case GL_TEXTURE_CUBE_MAP:
  49       return GetCubeServiceId(unit);
  50     case GL_TEXTURE_RECTANGLE_ARB:
  51       return GetArbServiceId(unit);
  52     case GL_TEXTURE_EXTERNAL_OES:
  53       return GetOesServiceId(unit);
  54     default:
  55       NOTREACHED();
  56       return 0;
  57   }
  58 }
  59
  60 bool TargetIsSupported(const FeatureInfo* feature_info, GLuint target) {
  61   switch (target) {
  62     case GL_TEXTURE_2D:
  63       return true;
  64     case GL_TEXTURE_CUBE_MAP:
  65       return true;
  66     case GL_TEXTURE_RECTANGLE_ARB:
  67       return feature_info->feature_flags().arb_texture_rectangle;
  68     case GL_TEXTURE_EXTERNAL_OES:
  69       return feature_info->feature_flags().oes_egl_image_external;
  70     default:
  71       NOTREACHED();
  72       return false;
  73   }
  74 }
  75
  76 GLuint GetBufferId(const Buffer* buffer) {
  77   if (buffer)
  78     return buffer->service_id();
  79   return 0;
  80 }
  81
  82 }  // anonymous namespace.
  83
  84 TextureUnit::TextureUnit()
  85     : bind_target(GL_TEXTURE_2D) {
  86 }
  87
  88 TextureUnit::~TextureUnit() {
  89 }
  90
  91 bool Vec4::Equal(const Vec4& other) const {
  92   if (type_ != other.type_)
  93     return false;
  94   switch (type_) {
  95     case kFloat:
  96       for (size_t ii = 0; ii < 4; ++ii) {
  97         if (v_[ii].float_value != other.v_[ii].float_value)
  98           return false;
  99       }
 100       break;
 101     case kInt:
 102       for (size_t ii = 0; ii < 4; ++ii) {
 103         if (v_[ii].int_value != other.v_[ii].int_value)
 104           return false;
 105       }
 106       break;
 107     case kUInt:
 108       for (size_t ii = 0; ii < 4; ++ii) {
 109         if (v_[ii].uint_value != other.v_[ii].uint_value)
 110           return false;
 111       }
 112       break;
 113   }
 114   return true;
 115 }
 116
 117 template <>
 118 void Vec4::GetValues<GLfloat>(GLfloat* values) const {
 119   DCHECK(values);
 120   switch (type_) {
 121     case kFloat:
 122       for (size_t ii = 0; ii < 4; ++ii)
 123         values[ii] = v_[ii].float_value;
 124       break;
 125     case kInt:
 126       for (size_t ii = 0; ii < 4; ++ii)
 127         values[ii] = static_cast<GLfloat>(v_[ii].int_value);
 128       break;
 129     case kUInt:
 130       for (size_t ii = 0; ii < 4; ++ii)
 131         values[ii] = static_cast<GLfloat>(v_[ii].uint_value);
 132       break;
 133   }
 134 }
 135
 136 template <>
 137 void Vec4::GetValues<GLint>(GLint* values) const {
 138   DCHECK(values);
 139   switch (type_) {
 140     case kFloat:
 141       for (size_t ii = 0; ii < 4; ++ii)
 142         values[ii] = static_cast<GLint>(v_[ii].float_value);
 143       break;
 144     case kInt:
 145       for (size_t ii = 0; ii < 4; ++ii)
 146         values[ii] = v_[ii].int_value;
 147       break;
 148     case kUInt:
 149       for (size_t ii = 0; ii < 4; ++ii)
 150         values[ii] = static_cast<GLint>(v_[ii].uint_value);
 151       break;
 152   }
 153 }
 154
 155 template<>
 156 void Vec4::GetValues<GLuint>(GLuint* values) const {
 157   DCHECK(values);
 158   switch (type_) {
 159     case kFloat:
 160       for (size_t ii = 0; ii < 4; ++ii)
 161         values[ii] = static_cast<GLuint>(v_[ii].float_value);
 162       break;
 163     case kInt:
 164       for (size_t ii = 0; ii < 4; ++ii)
 165         values[ii] = static_cast<GLuint>(v_[ii].int_value);
 166       break;
 167     case kUInt:
 168       for (size_t ii = 0; ii < 4; ++ii)
 169         values[ii] = v_[ii].uint_value;
 170       break;
 171   }
 172 }
 173
 174 template <>
 175 void Vec4::SetValues<GLfloat>(const GLfloat* values) {
 176   DCHECK(values);
 177   for (size_t ii = 0; ii < 4; ++ii)
 178     v_[ii].float_value = values[ii];
 179   type_ = kFloat;
 180 }
 181
 182 template <>
 183 void Vec4::SetValues<GLint>(const GLint* values) {
 184   DCHECK(values);
 185   for (size_t ii = 0; ii < 4; ++ii)
 186     v_[ii].int_value = values[ii];
 187   type_ = kInt;
 188 }
 189
 190 template <>
 191 void Vec4::SetValues<GLuint>(const GLuint* values) {
 192   DCHECK(values);
 193   for (size_t ii = 0; ii < 4; ++ii)
 194     v_[ii].uint_value = values[ii];
 195   type_ = kUInt;
 196 }
 197
 198 ContextState::ContextState(FeatureInfo* feature_info,
 199                            ErrorStateClient* error_state_client,
 200                            Logger* logger)
 201     : active_texture_unit(0),
 202       bound_renderbuffer_valid(false),
 203       pack_reverse_row_order(false),
 204       ignore_cached_state(false),
 205       fbo_binding_for_scissor_workaround_dirty(false),
 206       feature_info_(feature_info),
 207       error_state_(ErrorState::Create(error_state_client, logger)) {
 208   Initialize();
 209 }
 210
 211 ContextState::~ContextState() {
 212 }
 213
 214 void ContextState::RestoreTextureUnitBindings(
 215     GLuint unit, const ContextState* prev_state) const {
 216   DCHECK_LT(unit, texture_units.size());
 217   const TextureUnit& texture_unit = texture_units[unit];
 218   GLuint service_id_2d = Get2dServiceId(texture_unit);
 219   GLuint service_id_cube = GetCubeServiceId(texture_unit);
 220   GLuint service_id_oes = GetOesServiceId(texture_unit);
 221   GLuint service_id_arb = GetArbServiceId(texture_unit);
 222
 223   bool bind_texture_2d = true;
 224   bool bind_texture_cube = true;
 225   bool bind_texture_oes = feature_info_->feature_flags().oes_egl_image_external;
 226   bool bind_texture_arb = feature_info_->feature_flags().arb_texture_rectangle;
 227
 228   if (prev_state) {
 229     const TextureUnit& prev_unit = prev_state->texture_units[unit];
 230     bind_texture_2d = service_id_2d != Get2dServiceId(prev_unit);
 231     bind_texture_cube = service_id_cube != GetCubeServiceId(prev_unit);
 232     bind_texture_oes =
 233         bind_texture_oes && service_id_oes != GetOesServiceId(prev_unit);
 234     bind_texture_arb =
 235         bind_texture_arb && service_id_arb != GetArbServiceId(prev_unit);
 236   }
 237
 238   // Early-out if nothing has changed from the previous state.
 239   if (!bind_texture_2d && !bind_texture_cube
 240       && !bind_texture_oes && !bind_texture_arb) {
 241     return;
 242   }
 243
 244   glActiveTexture(GL_TEXTURE0 + unit);
 245   if (bind_texture_2d) {
 246     glBindTexture(GL_TEXTURE_2D, service_id_2d);
 247   }
 248   if (bind_texture_cube) {
 249     glBindTexture(GL_TEXTURE_CUBE_MAP, service_id_cube);
 250   }
 251   if (bind_texture_oes) {
 252     glBindTexture(GL_TEXTURE_EXTERNAL_OES, service_id_oes);
 253   }
 254   if (bind_texture_arb) {
 255     glBindTexture(GL_TEXTURE_RECTANGLE_ARB, service_id_arb);
 256   }
 257 }
 258
 259 void ContextState::RestoreBufferBindings() const {
 260   if (vertex_attrib_manager.get()) {
 261     Buffer* element_array_buffer =
 262         vertex_attrib_manager->element_array_buffer();
 263     glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, GetBufferId(element_array_buffer));
 264   }
 265   glBindBuffer(GL_ARRAY_BUFFER, GetBufferId(bound_array_buffer.get()));
 266   if (feature_info_->IsES3Capable()) {
 267     glBindBuffer(GL_COPY_READ_BUFFER,
 268                  GetBufferId(bound_copy_read_buffer.get()));
 269     glBindBuffer(GL_COPY_WRITE_BUFFER,
 270                  GetBufferId(bound_copy_write_buffer.get()));
 271     glBindBuffer(GL_PIXEL_PACK_BUFFER,
 272                  GetBufferId(bound_pixel_pack_buffer.get()));
 273     glBindBuffer(GL_PIXEL_UNPACK_BUFFER,
 274                  GetBufferId(bound_pixel_unpack_buffer.get()));
 275     glBindBuffer(GL_TRANSFORM_FEEDBACK_BUFFER,
 276                  GetBufferId(bound_transform_feedback_buffer.get()));
 277     glBindBuffer(GL_UNIFORM_BUFFER, GetBufferId(bound_uniform_buffer.get()));
 278   }
 279 }
 280
 281 void ContextState::RestoreRenderbufferBindings() {
 282   // Require Renderbuffer rebind.
 283   bound_renderbuffer_valid = false;
 284 }
 285
 286 void ContextState::RestoreProgramBindings() const {
 287   glUseProgram(current_program.get() ? current_program->service_id() : 0);
 288 }
 289
 290 void ContextState::RestoreActiveTexture() const {
 291   glActiveTexture(GL_TEXTURE0 + active_texture_unit);
 292 }
 293
 294 void ContextState::RestoreAllTextureUnitBindings(
 295     const ContextState* prev_state) const {
 296   // Restore Texture state.
 297   for (size_t ii = 0; ii < texture_units.size(); ++ii) {
 298     RestoreTextureUnitBindings(ii, prev_state);
 299   }
 300   RestoreActiveTexture();
 301 }
 302
 303 void ContextState::RestoreActiveTextureUnitBinding(unsigned int target) const {
 304   DCHECK_LT(active_texture_unit, texture_units.size());
 305   const TextureUnit& texture_unit = texture_units[active_texture_unit];
 306   if (TargetIsSupported(feature_info_, target))
 307     glBindTexture(target, GetServiceId(texture_unit, target));
 308 }
 309
 310 void ContextState::RestoreVertexAttribValues() const {
 311   for (size_t attrib = 0; attrib < vertex_attrib_manager->num_attribs();
 312        ++attrib) {
 313     switch (attrib_values[attrib].type()) {
 314       case Vec4::kFloat:
 315         {
 316           GLfloat v[4];
 317           attrib_values[attrib].GetValues(v);
 318           glVertexAttrib4fv(attrib, v);
 319         }
 320         break;
 321       case Vec4::kInt:
 322         {
 323           GLint v[4];
 324           attrib_values[attrib].GetValues(v);
 325           glVertexAttribI4iv(attrib, v);
 326         }
 327         break;
 328       case Vec4::kUInt:
 329         {
 330           GLuint v[4];
 331           attrib_values[attrib].GetValues(v);
 332           glVertexAttribI4uiv(attrib, v);
 333         }
 334         break;
 335     }
 336   }
 337 }
 338
 339 void ContextState::RestoreVertexAttribArrays(
 340     const scoped_refptr<VertexAttribManager> attrib_manager) const {
 341   // This is expected to be called only for VAO with service_id 0,
 342   // either to restore the default VAO or a virtual VAO with service_id 0.
 343   GLuint vao_service_id = attrib_manager->service_id();
 344   DCHECK(vao_service_id == 0);
 345
 346   // Bind VAO if supported.
 347   if (feature_info_->feature_flags().native_vertex_array_object)
 348     glBindVertexArrayOES(vao_service_id);
 349
 350   // Restore vertex attrib arrays.
 351   for (size_t attrib_index = 0; attrib_index < attrib_manager->num_attribs();
 352        ++attrib_index) {
 353     const VertexAttrib* attrib = attrib_manager->GetVertexAttrib(attrib_index);
 354
 355     // Restore vertex array.
 356     Buffer* buffer = attrib->buffer();
 357     GLuint buffer_service_id = buffer ? buffer->service_id() : 0;
 358     glBindBuffer(GL_ARRAY_BUFFER, buffer_service_id);
 359     const void* ptr = reinterpret_cast<const void*>(attrib->offset());
 360     glVertexAttribPointer(attrib_index,
 361                           attrib->size(),
 362                           attrib->type(),
 363                           attrib->normalized(),
 364                           attrib->gl_stride(),
 365                           ptr);
 366
 367     // Restore attrib divisor if supported.
 368     if (feature_info_->feature_flags().angle_instanced_arrays)
 369       glVertexAttribDivisorANGLE(attrib_index, attrib->divisor());
 370
 371     // Never touch vertex attribute 0's state (in particular, never
 372     // disable it) when running on desktop GL because it will never be
 373     // re-enabled.
 374     if (attrib_index != 0 ||
 375         gfx::GetGLImplementation() == gfx::kGLImplementationEGLGLES2) {
 376       if (attrib->enabled()) {
 377         glEnableVertexAttribArray(attrib_index);
 378       } else {
 379         glDisableVertexAttribArray(attrib_index);
 380       }
 381     }
 382   }
 383 }
 384
 385 void ContextState::RestoreVertexAttribs() const {
 386   // Restore Vertex Attrib Arrays
 387   // TODO: This if should not be needed. RestoreState is getting called
 388   // before GLES2Decoder::Initialize which is a bug.
 389   if (vertex_attrib_manager.get()) {
 390     // Restore VAOs.
 391     if (feature_info_->feature_flags().native_vertex_array_object) {
 392       // If default VAO is still using shared id 0 instead of unique ids
 393       // per-context, default VAO state must be restored.
 394       GLuint default_vao_service_id =
 395           default_vertex_attrib_manager->service_id();
 396       if (default_vao_service_id == 0)
 397         RestoreVertexAttribArrays(default_vertex_attrib_manager);
 398
 399       // Restore the current VAO binding, unless it's the same as the
 400       // default above.
 401       GLuint curr_vao_service_id = vertex_attrib_manager->service_id();
 402       if (curr_vao_service_id != 0)
 403         glBindVertexArrayOES(curr_vao_service_id);
 404     } else {
 405       // If native VAO isn't supported, emulated VAOs are used.
 406       // Restore to the currently bound VAO.
 407       RestoreVertexAttribArrays(vertex_attrib_manager);
 408     }
 409   }
 410
 411   // glVertexAttrib4fv aren't part of VAO state and must be restored.
 412   RestoreVertexAttribValues();
 413 }
 414
 415 void ContextState::RestoreGlobalState(const ContextState* prev_state) const {
 416   InitCapabilities(prev_state);
 417   InitState(prev_state);
 418 }
 419
 420 void ContextState::RestoreState(const ContextState* prev_state) {
 421   RestoreAllTextureUnitBindings(prev_state);
 422   RestoreVertexAttribs();
 423   RestoreBufferBindings();
 424   RestoreRenderbufferBindings();
 425   RestoreProgramBindings();
 426   RestoreGlobalState(prev_state);
 427 }
 428
 429 ErrorState* ContextState::GetErrorState() {
 430   return error_state_.get();
 431 }
 432
 433 void ContextState::EnableDisable(GLenum pname, bool enable) const {
 434   if (pname == GL_PRIMITIVE_RESTART_FIXED_INDEX) {
 435     if (feature_info_->feature_flags().emulate_primitive_restart_fixed_index)
 436       pname = GL_PRIMITIVE_RESTART;
 437   }
 438   if (enable) {
 439     glEnable(pname);
 440   } else {
 441     glDisable(pname);
 442   }
 443 }
 444
 445 void ContextState::SetBoundBuffer(GLenum target, Buffer* buffer) {
 446   switch (target) {
 447     case GL_ARRAY_BUFFER:
 448       bound_array_buffer = buffer;
 449       break;
 450     case GL_ELEMENT_ARRAY_BUFFER:
 451       vertex_attrib_manager->SetElementArrayBuffer(buffer);
 452       break;
 453     case GL_COPY_READ_BUFFER:
 454       bound_copy_read_buffer = buffer;
 455       break;
 456     case GL_COPY_WRITE_BUFFER:
 457       bound_copy_write_buffer = buffer;
 458       break;
 459     case GL_PIXEL_PACK_BUFFER:
 460       bound_pixel_pack_buffer = buffer;
 461       break;
 462     case GL_PIXEL_UNPACK_BUFFER:
 463       bound_pixel_unpack_buffer = buffer;
 464       break;
 465     case GL_TRANSFORM_FEEDBACK_BUFFER:
 466       bound_transform_feedback_buffer = buffer;
 467       break;
 468     case GL_UNIFORM_BUFFER:
 469       bound_uniform_buffer = buffer;
 470       break;
 471     default:
 472       NOTREACHED();
 473       break;
 474   }
 475 }
 476
 477 void ContextState::RemoveBoundBuffer(Buffer* buffer) {
 478   DCHECK(buffer);
 479   vertex_attrib_manager->Unbind(buffer);
 480   if (bound_array_buffer.get() == buffer) {
 481     bound_array_buffer = nullptr;
 482   }
 483   if (bound_copy_read_buffer.get() == buffer) {
 484     bound_copy_read_buffer = nullptr;
 485   }
 486   if (bound_copy_write_buffer.get() == buffer) {
 487     bound_copy_write_buffer = nullptr;
 488   }
 489   if (bound_pixel_pack_buffer.get() == buffer) {
 490     bound_pixel_pack_buffer = nullptr;
 491   }
 492   if (bound_pixel_unpack_buffer.get() == buffer) {
 493     bound_pixel_unpack_buffer = nullptr;
 494   }
 495   if (bound_transform_feedback_buffer.get() == buffer) {
 496     bound_transform_feedback_buffer = nullptr;
 497   }
 498   if (bound_uniform_buffer.get() == buffer) {
 499     bound_uniform_buffer = nullptr;
 500   }
 501 }
 502
 503 // Include the auto-generated part of this file. We split this because it means
 504 // we can easily edit the non-auto generated parts right here in this file
 505 // instead of having to edit some template or the code generator.
 506 #include "gpu/command_buffer/service/context_state_impl_autogen.h"
 507
 508 }  // namespace gles2
 509 }  // namespace gpu