From deceab256e88f486639c578a88e67fa38c1add92 Mon Sep 17 00:00:00 2001
From: Alex Szpakowski <slime73@gmail.com>
Date: Fri, 8 Aug 2014 15:14:09 -0300
Subject: [PATCH] Added iOS-specific functions to get the window view's current
 OpenGL Renderbuffer and Framebuffer objects, so they can be more easily
 rebound when necessary.

---
 include/SDL_system.h                  | 10 ++++++++
 src/video/uikit/SDL_uikitopengles.m   | 34 +++++++++++++++++++++++++++
 src/video/uikit/SDL_uikitopenglview.h |  3 +++
 src/video/uikit/SDL_uikitopenglview.m | 10 ++++++++
 4 files changed, 57 insertions(+)

diff --git a/include/SDL_system.h b/include/SDL_system.h
index 78d5b0d0a99d0..8184e597c2f76 100644
--- a/include/SDL_system.h
+++ b/include/SDL_system.h
@@ -70,6 +70,16 @@ extern DECLSPEC SDL_bool SDLCALL SDL_DXGIGetOutputInfo( int displayIndex, int *a
 extern DECLSPEC int SDLCALL SDL_iPhoneSetAnimationCallback(SDL_Window * window, int interval, void (*callback)(void*), void *callbackParam);
 extern DECLSPEC void SDLCALL SDL_iPhoneSetEventPump(SDL_bool enabled);
 
+/* Returns the OpenGL Renderbuffer Object associated with the window's main view.
+   The Renderbuffer must be bound when calling SDL_GL_SwapWindow.
+ */
+extern DECLSPEC Uint32 SDLCALL SDL_iPhoneGetViewRenderbuffer(SDL_Window * window);
+
+/* Returns the OpenGL Framebuffer Object associated with the window's main view.
+   The Framebuffer must be bound when rendering to the screen.
+ */
+extern DECLSPEC Uint32 SDLCALL SDL_iPhoneGetViewFramebuffer(SDL_Window * window);
+
 #endif /* __IPHONEOS__ */
 
 
diff --git a/src/video/uikit/SDL_uikitopengles.m b/src/video/uikit/SDL_uikitopengles.m
index 7d828093d5cbc..378099d8ea541 100644
--- a/src/video/uikit/SDL_uikitopengles.m
+++ b/src/video/uikit/SDL_uikitopengles.m
@@ -210,6 +210,40 @@ void UIKit_GL_SwapWindow(_THIS, SDL_Window * window)
     }
 }
 
+Uint32 SDL_iPhoneGetViewRenderbuffer(SDL_Window * window)
+{
+    if (!window) {
+        SDL_SetError("Invalid window");
+        return 0;
+    }
+
+    @autoreleasepool {
+        SDL_WindowData *data = (__bridge SDL_WindowData *) window->driverdata;
+        if (data.view != nil) {
+            return data.view.drawableRenderbuffer;
+        } else {
+            return 0;
+        }
+    }
+}
+
+Uint32 SDL_iPhoneGetViewFramebuffer(SDL_Window * window)
+{
+    if (!window) {
+        SDL_SetError("Invalid window");
+        return 0;
+    }
+
+    @autoreleasepool {
+        SDL_WindowData *data = (__bridge SDL_WindowData *) window->driverdata;
+        if (data.view != nil) {
+            return data.view.drawableFramebuffer;
+        } else {
+            return 0;
+        }
+    }
+}
+
 #endif /* SDL_VIDEO_DRIVER_UIKIT */
 
 /* vi: set ts=4 sw=4 expandtab: */
diff --git a/src/video/uikit/SDL_uikitopenglview.h b/src/video/uikit/SDL_uikitopenglview.h
index 9bb8f0c7f972e..b232c53fae59a 100644
--- a/src/video/uikit/SDL_uikitopenglview.h
+++ b/src/video/uikit/SDL_uikitopenglview.h
@@ -50,6 +50,9 @@
 @property (nonatomic, readonly) int backingWidth;
 @property (nonatomic, readonly) int backingHeight;
 
+@property (nonatomic, readonly) GLuint drawableRenderbuffer;
+@property (nonatomic, readonly) GLuint drawableFramebuffer;
+
 - (void)swapBuffers;
 - (void)setCurrentContext;
 
diff --git a/src/video/uikit/SDL_uikitopenglview.m b/src/video/uikit/SDL_uikitopenglview.m
index da724dce76df4..4b93ab6249d36 100644
--- a/src/video/uikit/SDL_uikitopenglview.m
+++ b/src/video/uikit/SDL_uikitopenglview.m
@@ -162,6 +162,16 @@ - (id)initWithFrame:(CGRect)frame
     return self;
 }
 
+- (GLuint)drawableRenderbuffer
+{
+    return viewRenderbuffer;
+}
+
+- (GLuint)drawableFramebuffer
+{
+    return viewFramebuffer;
+}
+
 - (void)updateFrame
 {
     glBindFramebufferOES(GL_FRAMEBUFFER_OES, viewFramebuffer);