GPU: support default framebuffer with ID not equal to 0

6 files changed, 38 insertions, 0 deletions

diff --git a/intern/ghost/GHOST_C-api.h b/intern/ghost/GHOST_C-api.h
index 3238be8fd87..ea9d6925e23 100644
--- a/intern/ghost/GHOST_C-api.h
+++ b/intern/ghost/GHOST_C-api.h
@@ -722,6 +722,11 @@ extern GHOST_TSuccess GHOST_ActivateOpenGLContext(GHOST_ContextHandle contexthan
 extern GHOST_TSuccess GHOST_ReleaseOpenGLContext(GHOST_ContextHandle contexthandle);
 
 /**
+ * Get the OpenGL framebuffer handle that serves as a default framebuffer.
+ */
+extern unsigned int GHOST_GetDefaultOpenGLFramebuffer(GHOST_WindowHandle windwHandle);
+
+/**
  * Set which tablet API to use. Only affects Windows, other platforms have a single API.
  * \param systemhandle The handle to the system
  * \param api Enum indicating which API to use.
diff --git a/intern/ghost/GHOST_IWindow.h b/intern/ghost/GHOST_IWindow.h
index 8042244c536..52894a7c38d 100644
--- a/intern/ghost/GHOST_IWindow.h
+++ b/intern/ghost/GHOST_IWindow.h
@@ -218,6 +218,12 @@ class GHOST_IWindow {
   virtual GHOST_TSuccess activateDrawingContext() = 0;
 
   /**
+   * Gets the OpenGL framebuffer associated with the window's contents.
+   * \return The name of an OpenGL framebuffer object.
+   */
+  virtual unsigned int getDefaultFramebuffer() = 0;
+
+  /**
    * Invalidates the contents of this window.
    * \return Indication of success.
    */
diff --git a/intern/ghost/intern/GHOST_C-api.cpp b/intern/ghost/intern/GHOST_C-api.cpp
index 38ddf9819f9..ef653c114e8 100644
--- a/intern/ghost/intern/GHOST_C-api.cpp
+++ b/intern/ghost/intern/GHOST_C-api.cpp
@@ -633,6 +633,13 @@ GHOST_TSuccess GHOST_ReleaseOpenGLContext(GHOST_ContextHandle contexthandle)
   return context->releaseDrawingContext();
 }
 
+unsigned int GHOST_GetDefaultOpenGLFramebuffer(GHOST_WindowHandle windowhandle)
+{
+  GHOST_IWindow *window = (GHOST_IWindow *)windowhandle;
+
+  return window->getDefaultFramebuffer();
+}
+
 GHOST_TSuccess GHOST_InvalidateWindow(GHOST_WindowHandle windowhandle)
 {
   GHOST_IWindow *window = (GHOST_IWindow *)windowhandle;
diff --git a/intern/ghost/intern/GHOST_Context.h b/intern/ghost/intern/GHOST_Context.h
index 7937fd1f7c7..bbf6d6a510d 100644
--- a/intern/ghost/intern/GHOST_Context.h
+++ b/intern/ghost/intern/GHOST_Context.h
@@ -119,6 +119,15 @@ class GHOST_Context : public GHOST_IContext {
     return m_stereoVisual;
   }
 
+  /**
+   * Gets the OpenGL framebuffer associated with the OpenGL context
+   * \return The ID of an OpenGL framebuffer object.
+   */
+  virtual unsigned int getDefaultFramebuffer()
+  {
+    return 0;
+  }
+
  protected:
   void initContextGLEW();
 
diff --git a/intern/ghost/intern/GHOST_Window.cpp b/intern/ghost/intern/GHOST_Window.cpp
index 5649386063d..76f2d2347db 100644
--- a/intern/ghost/intern/GHOST_Window.cpp
+++ b/intern/ghost/intern/GHOST_Window.cpp
@@ -109,6 +109,11 @@ GHOST_TSuccess GHOST_Window::getSwapInterval(int &intervalOut)
   return m_context->getSwapInterval(intervalOut);
 }
 
+unsigned int GHOST_Window::getDefaultFramebuffer()
+{
+  return (m_context) ? m_context->getDefaultFramebuffer() : 0;
+}
+
 GHOST_TSuccess GHOST_Window::activateDrawingContext()
 {
   return m_context->activateDrawingContext();
diff --git a/intern/ghost/intern/GHOST_Window.h b/intern/ghost/intern/GHOST_Window.h
index acd0c93ff87..50a563453f6 100644
--- a/intern/ghost/intern/GHOST_Window.h
+++ b/intern/ghost/intern/GHOST_Window.h
@@ -262,6 +262,12 @@ class GHOST_Window : public GHOST_IWindow {
   GHOST_TSuccess updateDrawingContext();
 
   /**
+   * Gets the OpenGL framebuffer associated with the window's contents.
+   * \return The ID of an OpenGL framebuffer object.
+   */
+  virtual unsigned int getDefaultFramebuffer();
+
+  /**
    * Returns the window user data.
    * \return The window user data.
    */