cc: Avoid power of two textures.

After rounding up to 64, it becomes more likely to hit
power-of-two textures which are also bad for IMG. So, this
avoids powers-of-two for IMG, through a fast-path extension.

BUG=175319

No try, since it only failed win_rel full-screen tests, but
this only has any effect on Android Imagination devices.
NOTRY=true

Review URL: https://chromiumcodereview.appspot.com/12217102

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@182087 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 8 insertions, 0 deletions

diff --git a/gpu/command_buffer/service/feature_info.cc b/gpu/command_buffer/service/feature_info.cc
index 30c82d7..06d8444 100644
--- a/gpu/command_buffer/service/feature_info.cc
+++ b/gpu/command_buffer/service/feature_info.cc
@@ -166,6 +166,7 @@ void FeatureInfo::AddFeatures() {
   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]));
@@ -177,6 +178,7 @@ void FeatureInfo::AddFeatures() {
       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");
     }
   }
 
@@ -210,6 +212,12 @@ void FeatureInfo::AddFeatures() {
   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,