GPU plugin forwards repaint events to Pepper plugin.

WM_PAINT results in a call to Pepper repaint callback.
Implemented WM_ERASEBKGND to prevent flickering on repaint.
Implemented PGL_NO_CONTEXT (copied from EGL spec). This is already reviewed by alokp but unfortunately got entangled with this CL.

TEST=none
BUG=none

Review URL: http://codereview.chromium.org/571018

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@39530 0039d316-1c4b-4281-b951-d872f2087c98

9 files changed, 59 insertions, 19 deletions

diff --git a/gpu/demos/framework/demo.cc b/gpu/demos/framework/demo.cc
index 49fa519..1679b3f 100644
--- a/gpu/demos/framework/demo.cc
+++ b/gpu/demos/framework/demo.cc
@@ -31,5 +31,9 @@ void Demo::Draw() {
   Render(elapsed_sec);
 }
 
+bool Demo::IsAnimated() {
+  return false;
+}
+
 }  // namespace demos
 }  // namespace gpu
diff --git a/gpu/demos/framework/demo.h b/gpu/demos/framework/demo.h
index 801609b..28c8923 100644
--- a/gpu/demos/framework/demo.h
+++ b/gpu/demos/framework/demo.h
@@ -33,6 +33,10 @@ class Demo {
   // a rendering context has already been created and made current.
   virtual bool InitGL() = 0;
 
+  // Returns whether the demo is animated. Animated demos are drawn
+  // continuously. Unanimated demos are only drawn when the window is invalid.
+  virtual bool IsAnimated();
+
   // This function is called by the framework to perform OpenGL rendering.
   // When this function is called, it is assumed that the rendering context
   // has been made current.
diff --git a/gpu/demos/framework/main_pepper.cc b/gpu/demos/framework/main_pepper.cc
index 6937b62..cf8f510 100644
--- a/gpu/demos/framework/main_pepper.cc
+++ b/gpu/demos/framework/main_pepper.cc
@@ -90,6 +90,11 @@ void NPP_Print(NPP instance, NPPrint* platformPrint) {
 }
 
 int16 NPP_HandleEvent(NPP instance, void* event) {
+  Plugin* plugin = static_cast<Plugin*>(instance->pdata);
+
+  if (plugin)
+    return plugin->HandleEvent(*static_cast<NPPepperEvent*>(event));
+
   return 0;
 }
 
diff --git a/gpu/demos/framework/plugin.cc b/gpu/demos/framework/plugin.cc
index 0514f81..9ba01d4 100644
--- a/gpu/demos/framework/plugin.cc
+++ b/gpu/demos/framework/plugin.cc
@@ -74,8 +74,13 @@ NPClass plugin_class = {
   PluginSetProperty,
 };
 
-void PaintCallback(void* data) {
-  reinterpret_cast<gpu::demos::Plugin*>(data)->Paint();
+void TickCallback(void* data) {
+  reinterpret_cast<gpu::demos::Plugin*>(data)->Tick();
+}
+
+void RepaintCallback(NPP npp, NPDeviceContext3D* /* context */) {
+  Plugin* plugin = static_cast<Plugin*>(npp->pdata);
+  plugin->Paint();
 }
 }
 
@@ -96,7 +101,7 @@ Plugin::~Plugin() {
   // Destroy demo while GL context is current and before it is destroyed.
   pglMakeCurrent(pgl_context_);
   demo_.reset();
-  pglMakeCurrent(NULL);
+  pglMakeCurrent(PGL_NO_CONTEXT);
 
   DestroyContext();
 }
@@ -121,10 +126,22 @@ void Plugin::SetWindow(const NPWindow& window) {
 
   if (!pgl_context_) {
     CreateContext();
+
+    // Schedule first call to Tick.
+    if (demo_->IsAnimated())
+      g_browser->pluginthreadasynccall(npp_, TickCallback, this);
   }
+}
 
-  // Schedule the first call to Draw.
-  g_browser->pluginthreadasynccall(npp_, PaintCallback, this);
+int32 Plugin::HandleEvent(const NPPepperEvent& event) {
+  return 0;
+}
+
+void Plugin::Tick() {
+  Paint();
+
+  // Schedule another call to Tick.
+  g_browser->pluginthreadasynccall(npp_, TickCallback, this);
 }
 
 void Plugin::Paint() {
@@ -136,10 +153,7 @@ void Plugin::Paint() {
 
   demo_->Draw();
   pglSwapBuffers();
-  pglMakeCurrent(NULL);
-
-  // Schedule another call to Paint.
-  g_browser->pluginthreadasynccall(npp_, PaintCallback, this);
+  pglMakeCurrent(PGL_NO_CONTEXT);
 }
 
 void Plugin::CreateContext() {
@@ -149,6 +163,7 @@ void Plugin::CreateContext() {
   NPDeviceContext3DConfig config;
   config.commandBufferSize = kCommandBufferSize;
   device3d_->initializeContext(npp_, &config, &context3d_);
+  context3d_.repaintCallback = RepaintCallback;
 
   // Create a PGL context.
   pgl_context_ = pglCreateContext(npp_, device3d_, &context3d_);
@@ -156,7 +171,7 @@ void Plugin::CreateContext() {
   // Initialize demo.
   pglMakeCurrent(pgl_context_);
   CHECK(demo_->InitGL());
-  pglMakeCurrent(NULL);
+  pglMakeCurrent(PGL_NO_CONTEXT);
 }
 
 void Plugin::DestroyContext() {
diff --git a/gpu/demos/framework/plugin.h b/gpu/demos/framework/plugin.h
index 0f4b55e..640d9c0 100644
--- a/gpu/demos/framework/plugin.h
+++ b/gpu/demos/framework/plugin.h
@@ -26,6 +26,10 @@ class Plugin : public NPObject {
   NPP npp() const { return npp_; }
   void New(NPMIMEType pluginType, int16 argc, char* argn[], char* argv[]);
   void SetWindow(const NPWindow& window);
+  int32 HandleEvent(const NPPepperEvent& event);
+
+  // Called continuously for animated demos.
+  void Tick();
 
   // Called by the browser to paint the window.
   void Paint();
diff --git a/gpu/demos/framework/window_win.cc b/gpu/demos/framework/window_win.cc
index 37f41c2..dfd79fc 100644
--- a/gpu/demos/framework/window_win.cc
+++ b/gpu/demos/framework/window_win.cc
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include "gpu/demos/framework/demo.h"
 #include "gpu/demos/framework/window.h"
 
 namespace {
@@ -52,7 +53,8 @@ void Window::MainLoop() {
       ::DispatchMessage(&msg);
     }
     // Message queue is empty and application has not quit yet - keep painting.
-    if (!done) ::InvalidateRect(window_handle_, NULL, FALSE);
+    if (!done && demo_->IsAnimated())
+      ::InvalidateRect(window_handle_,NULL, FALSE);
   }
 }
 
diff --git a/gpu/demos/gles2_book/simple_vertex_shader.cc b/gpu/demos/gles2_book/simple_vertex_shader.cc
index dff99ca..0f8b72e 100644
--- a/gpu/demos/gles2_book/simple_vertex_shader.cc
+++ b/gpu/demos/gles2_book/simple_vertex_shader.cc
@@ -22,6 +22,10 @@ class SimpleVertexShader : public Example<SVSUserData> {
   const wchar_t* Title() const {
     return L"Simple Vertex Shader";
   }
+
+  virtual bool IsAnimated() {
+    return true;
+  }
 };
 }  // namespace gles2_book
 
diff --git a/gpu/pgl/pgl.cc b/gpu/pgl/pgl.cc
index d357fe2..59c2635 100644
--- a/gpu/pgl/pgl.cc
+++ b/gpu/pgl/pgl.cc
@@ -223,7 +223,7 @@ PGLBoolean pglDestroyContext(PGLContext pgl_context) {
     return PGL_FALSE;
 
   if (pgl_context == pglGetCurrentContext())
-    pglMakeCurrent(NULL);
+    pglMakeCurrent(PGL_NO_CONTEXT);
 
   delete static_cast<PGLContextImpl*>(pgl_context);
   return PGL_TRUE;
diff --git a/gpu/pgl/pgl.h b/gpu/pgl/pgl.h
index ac67ec1..118d6fe 100644
--- a/gpu/pgl/pgl.h
+++ b/gpu/pgl/pgl.h
@@ -8,8 +8,10 @@
 #include "npapi.h"
 #include "npapi_extensions.h"
 
-#define PGL_TRUE 1
-#define PGL_FALSE 0
+#define PGL_TRUE          1
+#define PGL_FALSE         0
+
+#define PGL_NO_CONTEXT    ((PGLContext) 0)
 
 #ifdef __cplusplus
 extern "C" {
@@ -21,11 +23,11 @@ typedef int32 PGLInt;
 
 // These are the same error codes as used by EGL.
 enum {
-  PGL_SUCCESS = 0x3000,
-  PGL_NOT_INITIALIZED = 0x3001,
-  PGL_BAD_CONTEXT = 0x3006,
-  PGL_BAD_PARAMETER = 0x300C,
-  PGL_CONTEXT_LOST = 0x300E
+  PGL_SUCCESS             = 0x3000,
+  PGL_NOT_INITIALIZED     = 0x3001,
+  PGL_BAD_CONTEXT         = 0x3006,
+  PGL_BAD_PARAMETER       = 0x300C,
+  PGL_CONTEXT_LOST        = 0x300E
 };
 
 // Initialize the PGL library. This must have completed before any other PGL