Added pglGetCurrentContext. Make gles2 implementation pointer global variable thread local.

TEST=none
BUG=none

Review URL: http://codereview.chromium.org/549090

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@36560 0039d316-1c4b-4281-b951-d872f2087c98

2 files changed, 24 insertions, 10 deletions

diff --git a/gpu/pgl/pgl.cc b/gpu/pgl/pgl.cc
index c403265..2fd3d8b 100644
--- a/gpu/pgl/pgl.cc
+++ b/gpu/pgl/pgl.cc
@@ -8,12 +8,6 @@
 #include "gpu/pgl/command_buffer_pepper.h"
 #include "gpu/pgl/pgl.h"
 
-#if defined(_MSC_VER)
-#define THREAD_LOCAL __declspec(thread)
-#else
-#define THREAD_LOCAL __thread
-#endif
-
 namespace {
 const int32 kTransferBufferSize = 512 * 1024;
 
@@ -111,9 +105,9 @@ void PGLContextImpl::Destroy() {
 bool PGLContextImpl::MakeCurrent(PGLContextImpl* pgl_context) {
   g_current_pgl_context = pgl_context;
   if (pgl_context)
-    gles2::g_gl_impl = pgl_context->gles2_implementation_;
+    gles2::SetGLContext(pgl_context->gles2_implementation_);
   else
-    gles2::g_gl_impl = NULL;
+    gles2::SetGLContext(NULL);
 
   return true;
 }
@@ -143,7 +137,11 @@ PGLBoolean pglMakeCurrent(PGLContext pgl_context) {
   return PGLContextImpl::MakeCurrent(static_cast<PGLContextImpl*>(pgl_context));
 }
 
-PGLBoolean pglSwapBuffers() {
+PGLContext pglGetCurrentContext(void) {
+  return g_current_pgl_context;
+}
+
+PGLBoolean pglSwapBuffers(void) {
   if (!g_current_pgl_context)
     return false;
 
diff --git a/gpu/pgl/pgl.h b/gpu/pgl/pgl.h
index 6914aae..f848968 100644
--- a/gpu/pgl/pgl.h
+++ b/gpu/pgl/pgl.h
@@ -8,16 +8,32 @@
 #include "npapi.h"
 #include "npapi_extensions.h"
 
+#ifdef __cplusplus
 extern "C" {
+#endif
+
 typedef void* PGLContext;
 typedef bool PGLBoolean;
 
+// Create A PGL context from a Pepper 3D device context.
 PGLContext pglCreateContext(NPP npp,
                             NPDevice* device,
                             NPDeviceContext3D* device_context);
+
+// Set the current PGL context for the calling thread.
 PGLBoolean pglMakeCurrent(PGLContext pgl_context);
-PGLBoolean pglSwapBuffers();
+
+// Get the calling thread's current PGL context.
+PGLContext pglGetCurrentContext(void);
+
+// Display everything that has been rendered since the last call.
+PGLBoolean pglSwapBuffers(void);
+
+// Destroy the given PGL context.
 PGLBoolean pglDestroyContext(PGLContext pgl_context);
+
+#ifdef __cplusplus
 }  // extern "C"
+#endif
 
 #endif  // GPU_PGL_PGL_H