From 62fe7e9a9d0e211bc2ad4cdfedb2489c5f899133 Mon Sep 17 00:00:00 2001
From: Tomoaki Kawada <i@yvt.jp>
Date: Sat, 1 Jun 2019 17:54:07 +0200
Subject: GPU: support default framebuffer with ID not equal to 0

---
 intern/ghost/GHOST_C-api.h           | 5 +++++
 intern/ghost/GHOST_IWindow.h         | 6 ++++++
 intern/ghost/intern/GHOST_C-api.cpp  | 7 +++++++
 intern/ghost/intern/GHOST_Context.h  | 9 +++++++++
 intern/ghost/intern/GHOST_Window.cpp | 5 +++++
 intern/ghost/intern/GHOST_Window.h   | 6 ++++++
 6 files changed, 38 insertions(+)

(limited to 'intern')

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
@@ -721,6 +721,11 @@ 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
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
@@ -217,6 +217,12 @@ 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
@@ -261,6 +261,12 @@ 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.
-- 
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