Remove default textures in (!bind_generates_resource) context groups.

gpu/command_buffer/service/texture_manager.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "gpu/command_buffer/service/texture_manager.h"
 #include "base/bits.h"
 #include "base/strings/stringprintf.h"
 #include "gpu/command_buffer/common/gles2_cmd_utils.h"
 #include "gpu/command_buffer/service/context_state.h"
 #include "gpu/command_buffer/service/error_state.h"
@@ skipping 878 matching lines @@
 TextureRef::~TextureRef() {
   manager_->StopTracking(this);
   texture_->RemoveTextureRef(this, manager_->have_context_);
   manager_ = NULL;
 }
 
 TextureManager::TextureManager(MemoryTracker* memory_tracker,
                                FeatureInfo* feature_info,
                                GLint max_texture_size,
                                GLint max_cube_map_texture_size)
-    : memory_tracker_managed_(new MemoryTypeTracker(memory_tracker,
-                                                    MemoryTracker::kManaged)),
+    : memory_tracker_managed_(
+          new MemoryTypeTracker(memory_tracker, MemoryTracker::kManaged)),
       memory_tracker_unmanaged_(
           new MemoryTypeTracker(memory_tracker, MemoryTracker::kUnmanaged)),
       feature_info_(feature_info),
       framebuffer_manager_(NULL),
       max_texture_size_(max_texture_size),
       max_cube_map_texture_size_(max_cube_map_texture_size),
       max_levels_(ComputeMipMapCount(GL_TEXTURE_2D,
                                      max_texture_size,
                                      max_texture_size,
                                      max_texture_size)),
       max_cube_map_levels_(ComputeMipMapCount(GL_TEXTURE_CUBE_MAP,
                                               max_cube_map_texture_size,
                                               max_cube_map_texture_size,
                                               max_cube_map_texture_size)),
+      use_default_textures_(false),
       num_unrenderable_textures_(0),
       num_unsafe_textures_(0),
       num_uncleared_mips_(0),
       num_images_(0),
       texture_count_(0),
       have_context_(true) {
   for (int ii = 0; ii < kNumDefaultTextures; ++ii) {
     black_texture_ids_[ii] = 0;
   }
 }
@@ skipping 27 matching lines @@
         GLuint* black_texture) {
   static uint8 black[] = {0, 0, 0, 255};
 
   // Sampling a texture not associated with any EGLImage sibling will return
   // black values according to the spec.
   bool needs_initialization = (target != GL_TEXTURE_EXTERNAL_OES);
   bool needs_faces = (target == GL_TEXTURE_CUBE_MAP);
 
   // Make default textures and texture for replacing non-renderable textures.
   GLuint ids[2];
-  glGenTextures(arraysize(ids), ids);
-  for (unsigned long ii = 0; ii < arraysize(ids); ++ii) {
+  const unsigned long num_ids = use_default_textures_ ? 2 : 1;
+  glGenTextures(num_ids, ids);
+  for (unsigned long ii = 0; ii < num_ids; ++ii) {
     glBindTexture(target, ids[ii]);
     if (needs_initialization) {
       if (needs_faces) {
         for (int jj = 0; jj < GLES2Util::kNumFaces; ++jj) {
           glTexImage2D(GLES2Util::IndexToGLFaceTarget(jj), 0, GL_RGBA, 1, 1, 0,
                        GL_RGBA, GL_UNSIGNED_BYTE, black);
         }
       } else {
         glTexImage2D(target, 0, GL_RGBA, 1, 1, 0, GL_RGBA,
                      GL_UNSIGNED_BYTE, black);
       }
     }
   }
   glBindTexture(target, 0);
 
-  scoped_refptr<TextureRef> default_texture(
-      TextureRef::Create(this, 0, ids[1]));
-  SetTarget(default_texture.get(), target);
-  if (needs_faces) {
-    for (int ii = 0; ii < GLES2Util::kNumFaces; ++ii) {
-      SetLevelInfo(default_texture.get(),
-                   GLES2Util::IndexToGLFaceTarget(ii),
-                   0,
-                   GL_RGBA,
-                   1,
-                   1,
-                   1,
-                   0,
-                   GL_RGBA,
-                   GL_UNSIGNED_BYTE,
-                   true);
-    }
-  } else {
-    if (needs_initialization) {
-      SetLevelInfo(default_texture.get(),
-                   GL_TEXTURE_2D,
-                   0,
-                   GL_RGBA,
-                   1,
-                   1,
-                   1,
-                   0,
-                   GL_RGBA,
-                   GL_UNSIGNED_BYTE,
-                   true);
+  scoped_refptr<TextureRef> default_texture;
+  if (use_default_textures_) {
+    default_texture = TextureRef::Create(this, 0, ids[1]);
+    SetTarget(default_texture.get(), target);
+    if (needs_faces) {
+      for (int ii = 0; ii < GLES2Util::kNumFaces; ++ii) {
+        SetLevelInfo(default_texture.get(),
+                     GLES2Util::IndexToGLFaceTarget(ii),
+                     0,
+                     GL_RGBA,
+                     1,
+                     1,
+                     1,
+                     0,
+                     GL_RGBA,
+                     GL_UNSIGNED_BYTE,
+                     true);
+      }
     } else {
-      SetLevelInfo(default_texture.get(),
-                   GL_TEXTURE_EXTERNAL_OES,
-                   0,
-                   GL_RGBA,
-                   1,
-                   1,
-                   1,
-                   0,
-                   GL_RGBA,
-                   GL_UNSIGNED_BYTE,
-                   true);
+      if (needs_initialization) {
+        SetLevelInfo(default_texture.get(),
+                     GL_TEXTURE_2D,
+                     0,
+                     GL_RGBA,
+                     1,
+                     1,
+                     1,
+                     0,
+                     GL_RGBA,
+                     GL_UNSIGNED_BYTE,
+                     true);
+      } else {
+        SetLevelInfo(default_texture.get(),
+                     GL_TEXTURE_EXTERNAL_OES,
+                     0,
+                     GL_RGBA,
+                     1,
+                     1,
+                     1,
+                     0,
+                     GL_RGBA,
+                     GL_UNSIGNED_BYTE,
+                     true);
+      }
     }
   }
 
   *black_texture = ids[0];
   return default_texture;
 }
 
 bool TextureManager::ValidForTarget(
     GLenum target, GLint level, GLsizei width, GLsizei height, GLsizei depth) {
   GLsizei max_size = MaxSizeForTarget(target) >> level;
@@ skipping 536 matching lines @@
 }
 
 ScopedTextureUploadTimer::~ScopedTextureUploadTimer() {
   texture_state_->texture_upload_count++;
   texture_state_->total_texture_upload_time +=
       base::TimeTicks::HighResNow() - begin_time_;
 }
 
 }  // namespace gles2
 }  // namespace gpu