From 3d9b82d9f87ad8f6a14675a0ed2ca644f47df45c Mon Sep 17 00:00:00 2001
From: "Ryan C. Gordon" <icculus@icculus.org>
Date: Fri, 12 Jul 2013 23:30:26 -0400
Subject: [PATCH] Implement SDL_GL_SHARE_WITH_CURRENT_CONTEXT for iOS.

Fixes Bugzilla #1947.
---
 src/video/uikit/SDL_uikitopengles.m   | 8 +++++++-
 src/video/uikit/SDL_uikitopenglview.h | 3 ++-
 src/video/uikit/SDL_uikitopenglview.m | 5 +++--
 3 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/src/video/uikit/SDL_uikitopengles.m b/src/video/uikit/SDL_uikitopengles.m
index b27b3ca93..0401ff8e5 100644
--- a/src/video/uikit/SDL_uikitopengles.m
+++ b/src/video/uikit/SDL_uikitopengles.m
@@ -104,6 +104,11 @@ SDL_GLContext UIKit_GL_CreateContext(_THIS, SDL_Window * window)
     SDL_DisplayData *displaydata = display->driverdata;
     SDL_DisplayModeData *displaymodedata = display->current_mode.driverdata;
     UIWindow *uiwindow = data->uiwindow;
+    EAGLSharegroup *share_group = nil;
+
+    if (_this->gl_config.share_with_current_context) {
+        share_group = [((SDL_uikitopenglview *) SDL_GL_GetCurrentContext() sharegroup];
+    }
 
     /* construct our view, passing in SDL's OpenGL configuration data */
     CGRect frame;
@@ -121,7 +126,8 @@ SDL_GLContext UIKit_GL_CreateContext(_THIS, SDL_Window * window)
                                     aBits: _this->gl_config.alpha_size
                                     depthBits: _this->gl_config.depth_size
                                     stencilBits: _this->gl_config.stencil_size
-                                    majorVersion: _this->gl_config.major_version];
+                                    majorVersion: _this->gl_config.major_version
+                                    shareGroup: share_group];
     if (!view) {
         return NULL;
     }
diff --git a/src/video/uikit/SDL_uikitopenglview.h b/src/video/uikit/SDL_uikitopenglview.h
index b29cca2c5..344ad6a5e 100644
--- a/src/video/uikit/SDL_uikitopenglview.h
+++ b/src/video/uikit/SDL_uikitopenglview.h
@@ -67,7 +67,8 @@
     aBits:(int)aBits
     depthBits:(int)depthBits
     stencilBits:(int)stencilBits
-    majorVersion:(int)majorVersion;
+    majorVersion:(int)majorVersion
+    shareGroup:(EAGLSharegroup*)shareGroup;
 
 - (void)updateFrame;
 
diff --git a/src/video/uikit/SDL_uikitopenglview.m b/src/video/uikit/SDL_uikitopenglview.m
index 6ca5162d9..9f3dc136a 100644
--- a/src/video/uikit/SDL_uikitopenglview.m
+++ b/src/video/uikit/SDL_uikitopenglview.m
@@ -47,6 +47,7 @@
       depthBits:(int)depthBits
       stencilBits:(int)stencilBits
       majorVersion:(int)majorVersion
+      shareGroup:(EAGLSharegroup*)shareGroup
 {
     depthBufferFormat = 0;
 
@@ -71,9 +72,9 @@
                                         [NSNumber numberWithBool: retained], kEAGLDrawablePropertyRetainedBacking, colorFormat, kEAGLDrawablePropertyColorFormat, nil];
 
         if (majorVersion > 1) {
-            context = [[EAGLContext alloc] initWithAPI: kEAGLRenderingAPIOpenGLES2];
+            context = [[EAGLContext alloc] initWithAPI:kEAGLRenderingAPIOpenGLES2 sharegroup:shareGroup];
         } else {
-            context = [[EAGLContext alloc] initWithAPI: kEAGLRenderingAPIOpenGLES1];
+            context = [[EAGLContext alloc] initWithAPI:kEAGLRenderingAPIOpenGLES1 sharegroup:shareGroup];
         }
         if (!context || ![EAGLContext setCurrentContext:context]) {
             [self release];