cc: Avoid power of two textures.

gpu/command_buffer/service/feature_info.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/feature_info.h"
 
 #include <set>
 
 #include "base/command_line.h"
 #include "base/string_number_conversions.h"
@@ skipping 148 matching lines @@
 
   static GLenum string_ids[] = {
     GL_VENDOR,
     GL_RENDERER,
   };
   bool is_intel = false;
   bool is_nvidia = false;
   bool is_amd = false;
   bool is_mesa = false;
   bool is_qualcomm = false;
+  bool is_imagination = false;
   for (size_t ii = 0; ii < arraysize(string_ids); ++ii) {
     const char* str = reinterpret_cast<const char*>(
           glGetString(string_ids[ii]));
     if (str) {
       std::string lstr(StringToLowerASCII(std::string(str)));
       StringSet string_set(lstr);
       is_intel |= string_set.Contains("intel");
       is_nvidia |= string_set.Contains("nvidia");
       is_amd |= string_set.Contains("amd") || string_set.Contains("ati");
       is_mesa |= string_set.Contains("mesa");
       is_qualcomm |= string_set.Contains("qualcomm");
+      is_imagination |= string_set.Contains("imagination");
     }
   }
 
   feature_flags_.disable_workarounds =
       CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kDisableGpuDriverBugWorkarounds);
 
   feature_flags_.enable_shader_name_hashing =
       !CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kDisableShaderNameHashing);
@@ skipping 13 matching lines @@
   AddExtensionString("GL_CHROMIUM_pixel_transfer_buffer_object");
   AddExtensionString("GL_CHROMIUM_rate_limit_offscreen_context");
   AddExtensionString("GL_CHROMIUM_resize");
   AddExtensionString("GL_CHROMIUM_resource_safe");
   AddExtensionString("GL_CHROMIUM_set_visibility");
   AddExtensionString("GL_CHROMIUM_strict_attribs");
   AddExtensionString("GL_CHROMIUM_stream_texture");
   AddExtensionString("GL_CHROMIUM_texture_mailbox");
   AddExtensionString("GL_EXT_debug_marker");
 
+  // Add extension to indicate fast-path texture uploads. This is
+  // for IMG, where everything except async + non-power-of-two +
+  // multiple-of-eight textures are brutally slow.
+  if (is_imagination)
+    AddExtensionString("GL_CHROMIUM_fast_NPOT_MO8_textures");
+
   feature_flags_.chromium_stream_texture = true;
 
   // OES_vertex_array_object is emulated if not present natively,
   // so the extension string is always exposed.
   AddExtensionString("GL_OES_vertex_array_object");
 
   if (!disallowed_features_.gpu_memory_manager)
     AddExtensionString("GL_CHROMIUM_gpu_memory_manager");
 
   if (extensions.Contains("GL_ANGLE_translated_shader_source")) {
@@ skipping 420 matching lines @@
   if (extensions_.find(str) == std::string::npos) {
     extensions_ += (extensions_.empty() ? "" : " ") + str;
   }
 }
 
 FeatureInfo::~FeatureInfo() {
 }
 
 }  // namespace gles2
 }  // namespace gpu