From 00fc9cdcb6573dab7e76b615669c9718bd07e0b1 Mon Sep 17 00:00:00 2001
From: Joshua Granick <jgranick@users.noreply.github.com>
Date: Thu, 1 Dec 2016 13:08:34 -0800
Subject: [PATCH] Improve behavior for default framebuffer on iOS

---
 project/src/backend/sdl/SDLRenderer.cpp        |  4 ++++
 project/src/graphics/opengl/OpenGLBindings.cpp | 15 ++++++++++++++-
 project/src/graphics/opengl/OpenGLBindings.h   |  1 +
 3 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/project/src/backend/sdl/SDLRenderer.cpp b/project/src/backend/sdl/SDLRenderer.cpp
index d045753de..89da79574 100644
--- a/project/src/backend/sdl/SDLRenderer.cpp
+++ b/project/src/backend/sdl/SDLRenderer.cpp
@@ -69,6 +69,10 @@ namespace lime {
 					valid = true;
 					#endif
 					
+					#ifdef IPHONEOS
+					glGetIntegerv (GL_FRAMEBUFFER_BINDING_OES, &OpenGLBindings::defaultFramebuffer);
+					#endif
+					
 				}
 				
 				if (!valid) {
diff --git a/project/src/graphics/opengl/OpenGLBindings.cpp b/project/src/graphics/opengl/OpenGLBindings.cpp
index 060df1d1f..d9352a814 100644
--- a/project/src/graphics/opengl/OpenGLBindings.cpp
+++ b/project/src/graphics/opengl/OpenGLBindings.cpp
@@ -28,6 +28,7 @@ namespace lime {
 	
 	bool OpenGLBindings::initialized = false;
 	void *OpenGLBindings::handle = 0;
+	int OpenGLBindings::defaultFramebuffer = 0;
 	
 	void lime_gl_delete_buffer (value handle);
 	void lime_gl_delete_framebuffer (value handle);
@@ -216,7 +217,19 @@ namespace lime {
 	
 	void lime_gl_bind_framebuffer (int target, value framebuffer) {
 		
-		glBindFramebuffer (target, val_is_null (framebuffer) ? 0 : reinterpret_cast<uintptr_t> (val_data (framebuffer)));
+		GLuint id;
+		
+		if (val_is_null (framebuffer)) {
+			
+			id = OpenGLBindings::defaultFramebuffer;
+			
+		} else {
+			
+			id = reinterpret_cast<uintptr_t> (val_data (framebuffer));
+			
+		}
+		
+		glBindFramebuffer (target, id);
 		
 	}
 	
diff --git a/project/src/graphics/opengl/OpenGLBindings.h b/project/src/graphics/opengl/OpenGLBindings.h
index 6e7328454..fb9306438 100644
--- a/project/src/graphics/opengl/OpenGLBindings.h
+++ b/project/src/graphics/opengl/OpenGLBindings.h
@@ -11,6 +11,7 @@ namespace lime {
 			
 			static bool Init ();
 			
+			static int defaultFramebuffer;
 			static void* handle;