import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

gfx/layers/opengl/TexturePoolOGL.cpp

@@ -0,0 +1,123 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "TexturePoolOGL.h"
+#include <stdlib.h>                     // for malloc
+#include "GLContext.h"                  // for GLContext
+#include "mozilla/Monitor.h"            // for Monitor, MonitorAutoLock
+#include "mozilla/mozalloc.h"           // for operator delete, etc
+#include "nsDebug.h"                    // for NS_ASSERTION, NS_ERROR, etc
+#include "nsDeque.h"                    // for nsDeque
+
+#define TEXTURE_POOL_SIZE 10
+
+namespace mozilla {
+namespace gl {
+
+static GLContext* sActiveContext = nullptr;
+
+static Monitor* sMonitor = nullptr;
+static nsDeque* sTextures = nullptr;
+
+GLuint TexturePoolOGL::AcquireTexture()
+{
+  NS_ASSERTION(sMonitor, "not initialized");
+
+  MonitorAutoLock lock(*sMonitor);
+
+  if (!sActiveContext) {
+    // Wait for a context
+    sMonitor->Wait();
+
+    if (!sActiveContext)
+      return 0;
+  }
+
+  GLuint texture = 0;
+  if (sActiveContext->IsOwningThreadCurrent()) {
+    sActiveContext->MakeCurrent();
+
+    sActiveContext->fGenTextures(1, &texture);
+  } else {
+    while (sTextures->GetSize() == 0) {
+      NS_WARNING("Waiting for texture");
+      sMonitor->Wait();
+    }
+
+    GLuint* popped = (GLuint*) sTextures->Pop();
+    if (!popped) {
+      NS_ERROR("Failed to pop texture pool item");
+      return 0;
+    }
+
+    texture = *popped;
+    delete popped;
+
+    NS_ASSERTION(texture, "Failed to retrieve texture from pool");
+  }
+
+  return texture;
+}
+
+static void Clear()
+{
+  if (!sActiveContext)
+    return;
+
+  sActiveContext->MakeCurrent();
+
+  GLuint* item;
+  while (sTextures->GetSize()) {
+    item = (GLuint*)sTextures->Pop();
+    sActiveContext->fDeleteTextures(1, item);
+    delete item;
+  }
+}
+
+void TexturePoolOGL::Fill(GLContext* aContext)
+{
+  NS_ASSERTION(aContext, "NULL GLContext");
+  NS_ASSERTION(sMonitor, "not initialized");
+
+  MonitorAutoLock lock(*sMonitor);
+
+  if (sActiveContext != aContext) {
+    Clear();
+    sActiveContext = aContext;
+  }
+
+  if (sTextures->GetSize() == TEXTURE_POOL_SIZE)
+    return;
+
+  sActiveContext->MakeCurrent();
+
+  GLuint* texture = nullptr;
+  while (sTextures->GetSize() < TEXTURE_POOL_SIZE) {
+    texture = (GLuint*)malloc(sizeof(GLuint));
+    sActiveContext->fGenTextures(1, texture);
+    sTextures->Push((void*) texture);
+  }
+
+  sMonitor->NotifyAll();
+}
+
+GLContext* TexturePoolOGL::GetGLContext()
+{
+  return sActiveContext;
+}
+
+void TexturePoolOGL::Init()
+{
+  sMonitor = new Monitor("TexturePoolOGL.sMonitor");
+  sTextures = new nsDeque();
+}
+
+void TexturePoolOGL::Shutdown()
+{
+  delete sMonitor;
+  delete sTextures;
+}
+
+} // namespace gl
+} // namespace mozilla