ui/gl/gl_gl_api_implementation.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 "ui/gl/gl_gl_api_implementation.h"
   6
   7 #include <algorithm>
   8 #include <vector>
   9
  10 #include "base/command_line.h"
  11 #include "base/strings/string_util.h"
  12 #include "ui/gl/gl_context.h"
  13 #include "ui/gl/gl_implementation.h"
  14 #include "ui/gl/gl_state_restorer.h"
  15 #include "ui/gl/gl_surface.h"
  16 #include "ui/gl/gl_switches.h"
  17 #include "ui/gl/gl_version_info.h"
  18
  19 namespace gfx {
  20
  21 // The GL Api being used. This could be g_real_gl or gl_trace_gl
  22 static GLApi* g_gl = NULL;
  23 // A GL Api that calls directly into the driver.
  24 static RealGLApi* g_real_gl = NULL;
  25 // A GL Api that does nothing but warn about illegal GL calls without a context
  26 // current.
  27 static NoContextGLApi* g_no_context_gl = NULL;
  28 // A GL Api that calls TRACE and then calls another GL api.
  29 static TraceGLApi* g_trace_gl = NULL;
  30 // GL version used when initializing dynamic bindings.
  31 static GLVersionInfo* g_version_info = NULL;
  32
  33 namespace {
  34
  35 static inline GLenum GetInternalFormat(GLenum internal_format) {
  36   if (gfx::GetGLImplementation() != gfx::kGLImplementationEGLGLES2) {
  37     if (internal_format == GL_BGRA_EXT || internal_format == GL_BGRA8_EXT)
  38       return GL_RGBA8;
  39   }
  40   return internal_format;
  41 }
  42
  43 // TODO(epenner): Could the above function be merged into this and removed?
  44 static inline GLenum GetTexInternalFormat(GLenum internal_format,
  45                                           GLenum format,
  46                                           GLenum type) {
  47   GLenum gl_internal_format = GetInternalFormat(internal_format);
  48
  49   // g_version_info must be initialized when this function is bound.
  50   DCHECK(gfx::g_version_info);
  51   if (gfx::g_version_info->is_es3) {
  52     if (format == GL_RED_EXT) {
  53       switch (type) {
  54         case GL_UNSIGNED_BYTE:
  55           gl_internal_format = GL_R8_EXT;
  56           break;
  57         case GL_HALF_FLOAT_OES:
  58           gl_internal_format = GL_R16F_EXT;
  59           break;
  60         case GL_FLOAT:
  61           gl_internal_format = GL_R32F_EXT;
  62           break;
  63         default:
  64           NOTREACHED();
  65           break;
  66       }
  67       return gl_internal_format;
  68     } else if (format == GL_RG_EXT) {
  69       switch (type) {
  70         case GL_UNSIGNED_BYTE:
  71           gl_internal_format = GL_RG8_EXT;
  72           break;
  73         case GL_HALF_FLOAT_OES:
  74           gl_internal_format = GL_RG16F_EXT;
  75           break;
  76         case GL_FLOAT:
  77           gl_internal_format = GL_RG32F_EXT;
  78           break;
  79         default:
  80           NOTREACHED();
  81           break;
  82       }
  83       return gl_internal_format;
  84     }
  85   }
  86
  87   if (type == GL_FLOAT && gfx::g_version_info->is_angle &&
  88       gfx::g_version_info->is_es2) {
  89     // It's possible that the texture is using a sized internal format, and
  90     // ANGLE exposing GLES2 API doesn't support those.
  91     // TODO(oetuaho@nvidia.com): Remove these conversions once ANGLE has the
  92     // support.
  93     // http://code.google.com/p/angleproject/issues/detail?id=556
  94     switch (format) {
  95       case GL_RGBA:
  96         gl_internal_format = GL_RGBA;
  97         break;
  98       case GL_RGB:
  99         gl_internal_format = GL_RGB;
 100         break;
 101       default:
 102         break;
 103     }
 104   }
 105
 106   if (gfx::g_version_info->is_es)
 107     return gl_internal_format;
 108
 109   if (type == GL_FLOAT) {
 110     switch (format) {
 111       case GL_RGBA:
 112         gl_internal_format = GL_RGBA32F_ARB;
 113         break;
 114       case GL_RGB:
 115         gl_internal_format = GL_RGB32F_ARB;
 116         break;
 117       case GL_LUMINANCE_ALPHA:
 118         gl_internal_format = GL_LUMINANCE_ALPHA32F_ARB;
 119         break;
 120       case GL_LUMINANCE:
 121         gl_internal_format = GL_LUMINANCE32F_ARB;
 122         break;
 123       case GL_ALPHA:
 124         gl_internal_format = GL_ALPHA32F_ARB;
 125         break;
 126       default:
 127         NOTREACHED();
 128         break;
 129     }
 130   } else if (type == GL_HALF_FLOAT_OES) {
 131     switch (format) {
 132       case GL_RGBA:
 133         gl_internal_format = GL_RGBA16F_ARB;
 134         break;
 135       case GL_RGB:
 136         gl_internal_format = GL_RGB16F_ARB;
 137         break;
 138       case GL_LUMINANCE_ALPHA:
 139         gl_internal_format = GL_LUMINANCE_ALPHA16F_ARB;
 140         break;
 141       case GL_LUMINANCE:
 142         gl_internal_format = GL_LUMINANCE16F_ARB;
 143         break;
 144       case GL_ALPHA:
 145         gl_internal_format = GL_ALPHA16F_ARB;
 146         break;
 147       default:
 148         NOTREACHED();
 149         break;
 150     }
 151   }
 152   return gl_internal_format;
 153 }
 154
 155 static inline GLenum GetTexType(GLenum type) {
 156    if (gfx::GetGLImplementation() != gfx::kGLImplementationEGLGLES2) {
 157      if (type == GL_HALF_FLOAT_OES)
 158        return GL_HALF_FLOAT_ARB;
 159    }
 160    return type;
 161 }
 162
 163 static void GL_BINDING_CALL CustomTexImage2D(
 164     GLenum target, GLint level, GLint internalformat,
 165     GLsizei width, GLsizei height, GLint border, GLenum format, GLenum type,
 166     const void* pixels) {
 167   GLenum gl_internal_format = GetTexInternalFormat(
 168       internalformat, format, type);
 169   GLenum gl_type = GetTexType(type);
 170   g_driver_gl.orig_fn.glTexImage2DFn(
 171       target, level, gl_internal_format, width, height, border, format, gl_type,
 172       pixels);
 173 }
 174
 175 static void GL_BINDING_CALL CustomTexSubImage2D(
 176       GLenum target, GLint level, GLint xoffset, GLint yoffset, GLsizei width,
 177       GLsizei height, GLenum format, GLenum type, const void* pixels) {
 178   GLenum gl_type = GetTexType(type);
 179   g_driver_gl.orig_fn.glTexSubImage2DFn(
 180       target, level, xoffset, yoffset, width, height, format, gl_type, pixels);
 181 }
 182
 183 static void GL_BINDING_CALL CustomTexStorage2DEXT(
 184     GLenum target, GLsizei levels, GLenum internalformat, GLsizei width,
 185     GLsizei height) {
 186   GLenum gl_internal_format = GetInternalFormat(internalformat);
 187   g_driver_gl.orig_fn.glTexStorage2DEXTFn(
 188       target, levels, gl_internal_format, width, height);
 189 }
 190
 191 static void GL_BINDING_CALL CustomRenderbufferStorageEXT(
 192     GLenum target, GLenum internalformat, GLsizei width, GLsizei height) {
 193   GLenum gl_internal_format = GetInternalFormat(internalformat);
 194   g_driver_gl.orig_fn.glRenderbufferStorageEXTFn(
 195       target, gl_internal_format, width, height);
 196 }
 197
 198 // The ANGLE and IMG variants of glRenderbufferStorageMultisample currently do
 199 // not support BGRA render buffers so only the EXT one is customized. If
 200 // GL_CHROMIUM_renderbuffer_format_BGRA8888 support is added to ANGLE then the
 201 // ANGLE version should also be customized.
 202 static void GL_BINDING_CALL CustomRenderbufferStorageMultisampleEXT(
 203     GLenum target, GLsizei samples, GLenum internalformat, GLsizei width,
 204     GLsizei height) {
 205   GLenum gl_internal_format = GetInternalFormat(internalformat);
 206   g_driver_gl.orig_fn.glRenderbufferStorageMultisampleEXTFn(
 207       target, samples, gl_internal_format, width, height);
 208 }
 209
 210 }  // anonymous namespace
 211
 212 void DriverGL::InitializeCustomDynamicBindings(GLContext* context) {
 213   InitializeDynamicBindings(context);
 214
 215   DCHECK(orig_fn.glTexImage2DFn == NULL);
 216   orig_fn.glTexImage2DFn = fn.glTexImage2DFn;
 217   fn.glTexImage2DFn =
 218       reinterpret_cast<glTexImage2DProc>(CustomTexImage2D);
 219
 220   DCHECK(orig_fn.glTexSubImage2DFn == NULL);
 221   orig_fn.glTexSubImage2DFn = fn.glTexSubImage2DFn;
 222   fn.glTexSubImage2DFn =
 223       reinterpret_cast<glTexSubImage2DProc>(CustomTexSubImage2D);
 224
 225   DCHECK(orig_fn.glTexStorage2DEXTFn == NULL);
 226   orig_fn.glTexStorage2DEXTFn = fn.glTexStorage2DEXTFn;
 227   fn.glTexStorage2DEXTFn =
 228       reinterpret_cast<glTexStorage2DEXTProc>(CustomTexStorage2DEXT);
 229
 230   DCHECK(orig_fn.glRenderbufferStorageEXTFn == NULL);
 231   orig_fn.glRenderbufferStorageEXTFn = fn.glRenderbufferStorageEXTFn;
 232   fn.glRenderbufferStorageEXTFn =
 233       reinterpret_cast<glRenderbufferStorageEXTProc>(
 234       CustomRenderbufferStorageEXT);
 235
 236   DCHECK(orig_fn.glRenderbufferStorageMultisampleEXTFn == NULL);
 237   orig_fn.glRenderbufferStorageMultisampleEXTFn =
 238       fn.glRenderbufferStorageMultisampleEXTFn;
 239   fn.glRenderbufferStorageMultisampleEXTFn =
 240       reinterpret_cast<glRenderbufferStorageMultisampleEXTProc>(
 241       CustomRenderbufferStorageMultisampleEXT);
 242 }
 243
 244 static void GL_BINDING_CALL NullDrawClearFn(GLbitfield mask) {
 245   if (!g_driver_gl.null_draw_bindings_enabled)
 246     g_driver_gl.orig_fn.glClearFn(mask);
 247 }
 248
 249 static void GL_BINDING_CALL
 250 NullDrawDrawArraysFn(GLenum mode, GLint first, GLsizei count) {
 251   if (!g_driver_gl.null_draw_bindings_enabled)
 252     g_driver_gl.orig_fn.glDrawArraysFn(mode, first, count);
 253 }
 254
 255 static void GL_BINDING_CALL NullDrawDrawElementsFn(GLenum mode,
 256                                                    GLsizei count,
 257                                                    GLenum type,
 258                                                    const void* indices) {
 259   if (!g_driver_gl.null_draw_bindings_enabled)
 260     g_driver_gl.orig_fn.glDrawElementsFn(mode, count, type, indices);
 261 }
 262
 263 void DriverGL::InitializeNullDrawBindings() {
 264   DCHECK(orig_fn.glClearFn == NULL);
 265   orig_fn.glClearFn = fn.glClearFn;
 266   fn.glClearFn = NullDrawClearFn;
 267
 268   DCHECK(orig_fn.glDrawArraysFn == NULL);
 269   orig_fn.glDrawArraysFn = fn.glDrawArraysFn;
 270   fn.glDrawArraysFn = NullDrawDrawArraysFn;
 271
 272   DCHECK(orig_fn.glDrawElementsFn == NULL);
 273   orig_fn.glDrawElementsFn = fn.glDrawElementsFn;
 274   fn.glDrawElementsFn = NullDrawDrawElementsFn;
 275
 276   null_draw_bindings_enabled = true;
 277 }
 278
 279 bool DriverGL::HasInitializedNullDrawBindings() {
 280   return orig_fn.glClearFn != NULL && orig_fn.glDrawArraysFn != NULL &&
 281          orig_fn.glDrawElementsFn != NULL;
 282 }
 283
 284 bool DriverGL::SetNullDrawBindingsEnabled(bool enabled) {
 285   DCHECK(orig_fn.glClearFn != NULL);
 286   DCHECK(orig_fn.glDrawArraysFn != NULL);
 287   DCHECK(orig_fn.glDrawElementsFn != NULL);
 288
 289   bool before = null_draw_bindings_enabled;
 290   null_draw_bindings_enabled = enabled;
 291   return before;
 292 }
 293
 294 void InitializeStaticGLBindingsGL() {
 295   g_current_gl_context_tls = new base::ThreadLocalPointer<GLApi>;
 296   g_driver_gl.InitializeStaticBindings();
 297   if (!g_real_gl) {
 298     g_real_gl = new RealGLApi();
 299     g_trace_gl = new TraceGLApi(g_real_gl);
 300     g_no_context_gl = new NoContextGLApi();
 301   }
 302   g_real_gl->Initialize(&g_driver_gl);
 303   g_gl = g_real_gl;
 304   if (base::CommandLine::ForCurrentProcess()->HasSwitch(
 305           switches::kEnableGPUServiceTracing)) {
 306     g_gl = g_trace_gl;
 307   }
 308   SetGLToRealGLApi();
 309 }
 310
 311 GLApi* GetCurrentGLApi() {
 312   return g_current_gl_context_tls->Get();
 313 }
 314
 315 void SetGLApi(GLApi* api) {
 316   g_current_gl_context_tls->Set(api);
 317 }
 318
 319 void SetGLToRealGLApi() {
 320   SetGLApi(g_gl);
 321 }
 322
 323 void SetGLApiToNoContext() {
 324   SetGLApi(g_no_context_gl);
 325 }
 326
 327 const GLVersionInfo* GetGLVersionInfo() {
 328   return g_version_info;
 329 }
 330
 331 void InitializeDynamicGLBindingsGL(GLContext* context) {
 332   g_driver_gl.InitializeCustomDynamicBindings(context);
 333   DCHECK(context && context->IsCurrent(NULL) && !g_version_info);
 334   g_version_info = new GLVersionInfo(context->GetGLVersion().c_str(),
 335       context->GetGLRenderer().c_str());
 336 }
 337
 338 void InitializeDebugGLBindingsGL() {
 339   g_driver_gl.InitializeDebugBindings();
 340 }
 341
 342 void InitializeNullDrawGLBindingsGL() {
 343   g_driver_gl.InitializeNullDrawBindings();
 344 }
 345
 346 bool HasInitializedNullDrawGLBindingsGL() {
 347   return g_driver_gl.HasInitializedNullDrawBindings();
 348 }
 349
 350 bool SetNullDrawGLBindingsEnabledGL(bool enabled) {
 351   return g_driver_gl.SetNullDrawBindingsEnabled(enabled);
 352 }
 353
 354 void ClearGLBindingsGL() {
 355   if (g_real_gl) {
 356     delete g_real_gl;
 357     g_real_gl = NULL;
 358   }
 359   if (g_trace_gl) {
 360     delete g_trace_gl;
 361     g_trace_gl = NULL;
 362   }
 363   if (g_no_context_gl) {
 364     delete g_no_context_gl;
 365     g_no_context_gl = NULL;
 366   }
 367   g_gl = NULL;
 368   g_driver_gl.ClearBindings();
 369   if (g_current_gl_context_tls) {
 370     delete g_current_gl_context_tls;
 371     g_current_gl_context_tls = NULL;
 372   }
 373   if (g_version_info) {
 374     delete g_version_info;
 375     g_version_info = NULL;
 376   }
 377 }
 378
 379 GLApi::GLApi() {
 380 }
 381
 382 GLApi::~GLApi() {
 383   if (GetCurrentGLApi() == this)
 384     SetGLApi(NULL);
 385 }
 386
 387 GLApiBase::GLApiBase()
 388     : driver_(NULL) {
 389 }
 390
 391 GLApiBase::~GLApiBase() {
 392 }
 393
 394 void GLApiBase::InitializeBase(DriverGL* driver) {
 395   driver_ = driver;
 396 }
 397
 398 void GLApiBase::SignalFlush() {
 399   DCHECK(GLContext::GetCurrent());
 400   GLContext::GetCurrent()->OnFlush();
 401 }
 402
 403 RealGLApi::RealGLApi() {
 404 }
 405
 406 RealGLApi::~RealGLApi() {
 407 }
 408
 409 void RealGLApi::Initialize(DriverGL* driver) {
 410   InitializeBase(driver);
 411 }
 412
 413 void RealGLApi::glFlushFn() {
 414   GLApiBase::glFlushFn();
 415   GLApiBase::SignalFlush();
 416 }
 417
 418 void RealGLApi::glFinishFn() {
 419   GLApiBase::glFinishFn();
 420   GLApiBase::SignalFlush();
 421 }
 422
 423 TraceGLApi::~TraceGLApi() {
 424 }
 425
 426 NoContextGLApi::NoContextGLApi() {
 427 }
 428
 429 NoContextGLApi::~NoContextGLApi() {
 430 }
 431
 432 VirtualGLApi::VirtualGLApi()
 433     : real_context_(NULL),
 434       current_context_(NULL) {
 435 }
 436
 437 VirtualGLApi::~VirtualGLApi() {
 438 }
 439
 440 void VirtualGLApi::Initialize(DriverGL* driver, GLContext* real_context) {
 441   InitializeBase(driver);
 442   real_context_ = real_context;
 443
 444   DCHECK(real_context->IsCurrent(NULL));
 445   std::string ext_string(
 446       reinterpret_cast<const char*>(driver_->fn.glGetStringFn(GL_EXTENSIONS)));
 447   std::vector<std::string> ext;
 448   Tokenize(ext_string, " ", &ext);
 449
 450   std::vector<std::string>::iterator it;
 451   // We can't support GL_EXT_occlusion_query_boolean which is
 452   // based on GL_ARB_occlusion_query without a lot of work virtualizing
 453   // queries.
 454   it = std::find(ext.begin(), ext.end(), "GL_EXT_occlusion_query_boolean");
 455   if (it != ext.end())
 456     ext.erase(it);
 457
 458   extensions_ = JoinString(ext, " ");
 459 }
 460
 461 bool VirtualGLApi::MakeCurrent(GLContext* virtual_context, GLSurface* surface) {
 462   bool switched_contexts = g_current_gl_context_tls->Get() != this;
 463   GLSurface* current_surface = GLSurface::GetCurrent();
 464   if (switched_contexts || surface != current_surface) {
 465     // MakeCurrent 'lite' path that avoids potentially expensive MakeCurrent()
 466     // calls if the GLSurface uses the same underlying surface or renders to
 467     // an FBO.
 468     if (switched_contexts || !current_surface ||
 469         !virtual_context->IsCurrent(surface)) {
 470       if (!real_context_->MakeCurrent(surface)) {
 471         return false;
 472       }
 473     }
 474   }
 475
 476   DCHECK_EQ(real_context_, GLContext::GetRealCurrent());
 477   DCHECK(real_context_->IsCurrent(NULL));
 478   DCHECK(virtual_context->IsCurrent(surface));
 479
 480   if (switched_contexts || virtual_context != current_context_) {
 481 #if DCHECK_IS_ON()
 482     GLenum error = glGetErrorFn();
 483     // Accepting a context loss error here enables using debug mode to work on
 484     // context loss handling in virtual context mode.
 485     // There should be no other errors from the previous context leaking into
 486     // the new context.
 487     DCHECK(error == GL_NO_ERROR || error == GL_CONTEXT_LOST_KHR);
 488 #endif
 489
 490     // Set all state that is different from the real state
 491     GLApi* temp = GetCurrentGLApi();
 492     SetGLToRealGLApi();
 493     if (virtual_context->GetGLStateRestorer()->IsInitialized()) {
 494       virtual_context->GetGLStateRestorer()->RestoreState(
 495           (current_context_ && !switched_contexts)
 496               ? current_context_->GetGLStateRestorer()
 497               : NULL);
 498     }
 499     SetGLApi(temp);
 500     current_context_ = virtual_context;
 501   }
 502   SetGLApi(this);
 503
 504   virtual_context->SetCurrent(surface);
 505   if (!surface->OnMakeCurrent(virtual_context)) {
 506     LOG(ERROR) << "Could not make GLSurface current.";
 507     return false;
 508   }
 509   return true;
 510 }
 511
 512 void VirtualGLApi::OnReleaseVirtuallyCurrent(GLContext* virtual_context) {
 513   if (current_context_ == virtual_context)
 514     current_context_ = NULL;
 515 }
 516
 517 const GLubyte* VirtualGLApi::glGetStringFn(GLenum name) {
 518   switch (name) {
 519     case GL_EXTENSIONS:
 520       return reinterpret_cast<const GLubyte*>(extensions_.c_str());
 521     default:
 522       return driver_->fn.glGetStringFn(name);
 523   }
 524 }
 525
 526 void VirtualGLApi::glFlushFn() {
 527   GLApiBase::glFlushFn();
 528   GLApiBase::SignalFlush();
 529 }
 530
 531 void VirtualGLApi::glFinishFn() {
 532   GLApiBase::glFinishFn();
 533   GLApiBase::SignalFlush();
 534 }
 535
 536 ScopedSetGLToRealGLApi::ScopedSetGLToRealGLApi()
 537     : old_gl_api_(GetCurrentGLApi()) {
 538   SetGLToRealGLApi();
 539 }
 540
 541 ScopedSetGLToRealGLApi::~ScopedSetGLToRealGLApi() {
 542   SetGLApi(old_gl_api_);
 543 }
 544
 545 }  // namespace gfx