Repo created

iphone/Maps/Classes/iosOGLContextFactory.mm

@@ -0,0 +1,80 @@
+#import "iosOGLContextFactory.h"
+
+size_t constexpr kGLThreadsCount = 2;
+
+iosOGLContextFactory::iosOGLContextFactory(CAEAGLLayer * layer, dp::ApiVersion apiVersion,
+                                           bool presentAvailable)
+  : m_layer(layer)
+  , m_apiVersion(apiVersion)
+  , m_drawContext(nullptr)
+  , m_uploadContext(nullptr)
+  , m_isInitialized(false)
+  , m_initializationCounter(0)
+  , m_presentAvailable(presentAvailable)
+{}
+
+iosOGLContextFactory::~iosOGLContextFactory()
+{
+  delete m_drawContext;
+  delete m_uploadContext;
+}
+
+dp::GraphicsContext * iosOGLContextFactory::GetDrawContext()
+{
+  if (m_drawContext == nullptr)
+    m_drawContext = new iosOGLContext(m_layer, m_apiVersion, m_uploadContext, true /* needBuffers */);
+  return m_drawContext;
+}
+
+dp::GraphicsContext * iosOGLContextFactory::GetResourcesUploadContext()
+{
+  if (m_uploadContext == nullptr)
+    m_uploadContext = new iosOGLContext(m_layer, m_apiVersion, m_drawContext, false /* needBuffers */);
+  return m_uploadContext;
+}
+
+bool iosOGLContextFactory::IsDrawContextCreated() const
+{
+  return m_drawContext != nullptr;
+}
+
+bool iosOGLContextFactory::IsUploadContextCreated() const
+{
+  return m_uploadContext != nullptr;
+}
+
+void iosOGLContextFactory::SetPresentAvailable(bool available)
+{
+  std::lock_guard<std::mutex> lock(m_initializationMutex);
+  m_presentAvailable = available;
+  if (m_isInitialized)
+  {
+    m_drawContext->SetPresentAvailable(m_presentAvailable);
+  }
+  else if (m_initializationCounter >= kGLThreadsCount && m_presentAvailable)
+  {
+    m_isInitialized = true;
+    m_initializationCondition.notify_all();
+  }
+}
+
+void iosOGLContextFactory::WaitForInitialization(dp::GraphicsContext * context)
+{
+  std::unique_lock<std::mutex> lock(m_initializationMutex);
+  if (!m_isInitialized)
+  {
+    m_initializationCounter++;
+    if (m_initializationCounter >= kGLThreadsCount && m_presentAvailable)
+    {
+      m_isInitialized = true;
+      m_initializationCondition.notify_all();
+    }
+    else
+    {
+      m_initializationCondition.wait(lock, [this] { return m_isInitialized; });
+    }
+  }
+
+  if (static_cast<dp::GraphicsContext*>(m_drawContext) == context)
+    m_drawContext->SetPresentAvailable(m_presentAvailable);
+}