gpu: Async texture uploads for imagination drivers

This patch implements a limited async upload fast-path
for imagination drivers. The fast path is limited to
non-power-of-two but still multiple-of-eight textures.

This also cleans up the other Qualcomm work-around,
now that we have confirmed it's a Qualcomm bug.

BUG=168099


Review URL: https://chromiumcodereview.appspot.com/12051068

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@178687 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 37 insertions, 0 deletions

diff --git a/content/gpu/gpu_info_collector_android.cc b/content/gpu/gpu_info_collector_android.cc
index 924b119..557b537 100644
--- a/content/gpu/gpu_info_collector_android.cc
+++ b/content/gpu/gpu_info_collector_android.cc
@@ -11,6 +11,7 @@
 #include "base/string_split.h"
 #include "base/string_util.h"
 #include "content/public/common/content_switches.h"
+#include "ui/gfx/android/device_display_info.h"
 
 namespace {
 
@@ -72,6 +73,42 @@ bool CollectBasicGraphicsInfo(content::GPUInfo* gpu_info) {
     CommandLine::ForCurrentProcess()->AppendSwitch(
         switches::kEnableVirtualGLContexts);
   }
+
+  gfx::DeviceDisplayInfo info;
+  int default_tile_size = 256;
+
+  // For very high resolution displays (eg. Nexus 10), set the default
+  // tile size to be 512. This should be removed in favour of a generic
+  // hueristic that works across all platforms and devices, once that
+  // exists: http://crbug.com/159524. This switches to 512 for screens
+  // containing 40 or more 256x256 tiles, such that 1080p devices do
+  // not use 512x512 tiles (eg. 1920x1280 requires 37.5 tiles)
+  int numTiles = (info.GetDisplayWidth() *
+                  info.GetDisplayHeight()) / (256 * 256);
+  if (numTiles >= 40)
+    default_tile_size = 512;
+
+  // IMG: Fast async texture uploads only work with non-power-of-two,
+  // but still multiple-of-eight sizes.
+  // http://crbug.com/168099
+  if (is_img)
+    default_tile_size -= 8;
+
+  // Set the command line if it isn't already set and we changed
+  // the default tile size.
+  if (default_tile_size != 256 &&
+      !CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kDefaultTileWidth) &&
+      !CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kDefaultTileHeight)) {
+    std::stringstream size;
+    size << default_tile_size;
+    CommandLine::ForCurrentProcess()->AppendSwitchASCII(
+        switches::kDefaultTileWidth, size.str());
+    CommandLine::ForCurrentProcess()->AppendSwitchASCII(
+        switches::kDefaultTileHeight, size.str());
+  }
+
   return true;
 }