Add support for BGRA pixel format to the command buffer implementation of WebGraphicsContext3D. This will not be called until the WebKit-side change lands.

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/3170005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@55786 0039d316-1c4b-4281-b951-d872f2087c98

2 files changed, 22 insertions, 0 deletions

diff --git a/chrome/renderer/webgraphicscontext3d_command_buffer_impl.cc b/chrome/renderer/webgraphicscontext3d_command_buffer_impl.cc
index 6d2ada2..d8ac59f 100644
--- a/chrome/renderer/webgraphicscontext3d_command_buffer_impl.cc
+++ b/chrome/renderer/webgraphicscontext3d_command_buffer_impl.cc
@@ -10,6 +10,7 @@
 
 #include <algorithm>
 
+#include "base/string_tokenizer.h"
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "chrome/common/chrome_switches.h"
@@ -207,6 +208,26 @@ void WebGraphicsContext3DCommandBufferImpl::synthesizeGLError(
   }
 }
 
+static bool supports_extension(const char *ext_name) {
+  const char* extensions = (const char *) glGetString(GL_EXTENSIONS);
+  CStringTokenizer t(extensions, extensions + strlen(extensions), " ");
+  while (t.GetNext()) {
+    if (t.token() == ext_name) {
+      return true;
+    }
+  }
+  return false;
+}
+
+bool WebGraphicsContext3DCommandBufferImpl::supportsBGRA() {
+  static bool is_supported =
+    supports_extension("GL_EXT_texture_format_BGRA8888");
+  // TODO(senorblanco):  Also check for GL_EXT_read_format_bgra.  It's
+  // actually supported by the command buffer, it's just not reported in
+  // the extensions string.
+  return is_supported;
+}
+
 // Helper macros to reduce the amount of code.
 
 #define DELEGATE_TO_GL(name, glname)                                    \
diff --git a/chrome/renderer/webgraphicscontext3d_command_buffer_impl.h b/chrome/renderer/webgraphicscontext3d_command_buffer_impl.h
index c8c99ed..99e6448 100644
--- a/chrome/renderer/webgraphicscontext3d_command_buffer_impl.h
+++ b/chrome/renderer/webgraphicscontext3d_command_buffer_impl.h
@@ -336,6 +336,7 @@ class WebGraphicsContext3DCommandBufferImpl
   virtual void deleteTexture(unsigned);
 
   virtual void synthesizeGLError(unsigned long error);
+  virtual bool supportsBGRA();
 
  private:
   // The GGL context we use for OpenGL rendering.