From 73c0130a44d2029a152f3d8029850baf035e2a74 Mon Sep 17 00:00:00 2001
From: rachytski <siarhei.rachytski@gmail.com>
Date: Tue, 14 Feb 2012 17:07:20 +0400
Subject: [PATCH] added Renderer::readPixels as a synchronization method.

---
 yg/renderer.cpp | 25 +++++++++++++++++++++++++
 yg/renderer.hpp | 12 ++++++++++++
 2 files changed, 37 insertions(+)

diff --git a/yg/renderer.cpp b/yg/renderer.cpp
index 2fd56a52e0..ba1bff7c26 100644
--- a/yg/renderer.cpp
+++ b/yg/renderer.cpp
@@ -1,5 +1,6 @@
 #include "../base/SRC_FIRST.hpp"
 #include "renderer.hpp"
+#include "data_formats.hpp"
 #include "utils.hpp"
 #include "framebuffer.hpp"
 #include "renderbuffer.hpp"
@@ -177,6 +178,30 @@ namespace yg
       OGLCHECK(glFinish());
     }
 
+    Renderer::ReadPixels::ReadPixels(m2::RectU const & r, void * data)
+      : m_rect(r), m_data(data)
+    {}
+
+    void Renderer::ReadPixels::perform()
+    {
+      if (isDebugging())
+        LOG(LINFO, ("performing ReadPixels command"));
+
+      OGLCHECK(glReadPixels(m_rect.minX(),
+                            m_rect.minY(),
+                            m_rect.SizeX(),
+                            m_rect.SizeY(),
+                            RT_TRAITS::gl_pixel_format_type,
+                            RT_TRAITS::gl_pixel_data_type,
+                            m_data
+                            ));
+    }
+
+    void Renderer::readPixels(m2::RectU const & r, void * data, bool doForce)
+    {
+      processCommand(make_shared_ptr(new ReadPixels(r, data)), Packet::ECommand, doForce);
+    }
+
     void Renderer::finish()
     {
       shared_ptr<Command> command(new FinishCommand());
diff --git a/yg/renderer.hpp b/yg/renderer.hpp
index 3fb8157a9f..f08e4802c0 100644
--- a/yg/renderer.hpp
+++ b/yg/renderer.hpp
@@ -6,6 +6,7 @@
 #include "../base/threaded_list.hpp"
 #include "../std/function.hpp"
 #include "../std/shared_ptr.hpp"
+#include "../geometry/rect2d.hpp"
 
 namespace yg
 {
@@ -37,6 +38,16 @@ namespace yg
         void perform();
       };
 
+      struct ReadPixels : Command
+      {
+        m2::RectU m_rect;
+        void * m_data;
+
+        ReadPixels(m2::RectU const & r, void * data);
+
+        void perform();
+      };
+
       struct ChangeFrameBuffer : Command
       {
         shared_ptr<FrameBuffer> m_frameBuffer;
@@ -128,6 +139,7 @@ namespace yg
       unsigned int height() const;
 
       void finish();
+      void readPixels(m2::RectU const & r, void * data, bool doForce = false);
 
       bool isDebugging() const;