Add areShadersReady poll function

include/boo/graphicsdev/IGraphicsDataFactory.hpp

@@ -278,6 +278,7 @@ struct IGraphicsDataFactory {
   virtual void setDisplayGamma(float gamma) = 0;
   virtual bool isTessellationSupported(uint32_t& maxPatchSizeOut) = 0;
   virtual void waitUntilShadersReady() = 0;
+  virtual bool areShadersReady() = 0;
 };
 
 using GraphicsDataFactoryContext = IGraphicsDataFactory::Context;

lib/graphicsdev/Common.hpp

@@ -248,6 +248,10 @@ public:
     m_backcv.wait(lk, [this]() { return m_outstandingTasks == 0 || !m_running; });
   }
 
+  bool isReady() {
+    return m_outstandingTasks == 0 || !m_running;
+  }
+
   PipelineCompileQueue() {
     unsigned int numThreads = std::thread::hardware_concurrency();
     if (numThreads > 1)

lib/graphicsdev/GL.cpp

@@ -136,6 +136,8 @@ public:
   }
 
   void waitUntilShadersReady() {}
+
+  bool areShadersReady() { return true; }
 };
 
 static const GLenum USE_TABLE[] = {GL_INVALID_ENUM, GL_ARRAY_BUFFER, GL_ELEMENT_ARRAY_BUFFER, GL_UNIFORM_BUFFER};

lib/graphicsdev/Vulkan.cpp

@@ -147,6 +147,10 @@ public:
   void waitUntilShadersReady() {
     m_pipelineQueue.waitUntilReady();
   }
+
+  bool areShadersReady() {
+    return m_pipelineQueue.isReady();
+  }
 };
 
 static inline void ThrowIfFailed(VkResult res) {