From Konstantin Matveyev, "I've added GLES3 profile, which also enables GLES2 features (OSG_GLES3_AVAILABLE=true => OSG_GLES2_AVAILABLE=true).

If OSG_OPENGL_PROFILE="GLES3" =>
GraphicsWindowIOS will create gles3 context.
If failed, GraphicsWindowIOS will create gles2 context.
Multisampling also working.

"


git-svn-id: http://svn.openscenegraph.org/osg/OpenSceneGraph/trunk@14831 16af8721-9629-0410-8352-f15c8da7e697

CMakeLists.txt

@@ -402,7 +402,7 @@ OPTION(OSG_USE_REF_PTR_IMPLICIT_OUTPUT_CONVERSION "Set to ON to use the ref_ptr<
 
 
 # Map the OPENGL_PROFILE to OSG_GL*_AVAILABLE settings
-SET(OPENGL_PROFILE "GL2" CACHE STRING "OpenGL Profile to use, choose from GL2, GL3, GLES1, GLES2")
+SET(OPENGL_PROFILE "GL2" CACHE STRING "OpenGL Profile to use, choose from GL2, GL3, GLES1, GLES2, GLES3")
 
 IF ((OPENGL_PROFILE STREQUAL "GL1") OR (OPENGL_PROFILE STREQUAL "GL2"))
     OPTION(OSG_GL1_AVAILABLE "Set to OFF to disable use of OpenGL 1.x functions library." ON )
@@ -430,8 +430,12 @@ ENDIF()
 
 IF ((OPENGL_PROFILE STREQUAL "GLES2"))
     OPTION(OSG_GLES2_AVAILABLE "Set to OFF to disable use of OpenGL ES 2.x functions library." ON )
+ELSEIF ((OPENGL_PROFILE STREQUAL "GLES3"))
+    OPTION(OSG_GLES2_AVAILABLE "Set to OFF to disable use of OpenGL ES 2.x functions library." ON )
+    OPTION(OSG_GLES3_AVAILABLE "Set to OFF to disable use of OpenGL ES 3.x functions library." ON )
 ELSE()
     OPTION(OSG_GLES2_AVAILABLE "Set to OFF to disable use of OpenGL ES 2.x functions library." OFF )
+    OPTION(OSG_GLES3_AVAILABLE "Set to OFF to disable use of OpenGL ES 3.x functions library." OFF )
 ENDIF()
 
 
@@ -498,9 +502,11 @@ ELSEIF(OSG_GLES2_AVAILABLE)
     IF (APPLE AND NOT ANDROID)
         SET(OPENGL_HEADER1 "#include \"TargetConditionals.h\"" CACHE STRING "#include<> line for OpenGL Header")
         SET(OPENGL_HEADER2 "#include <OpenGLES/ES2/gl.h>" CACHE STRING "#include<> line for additional OpenGL Headers if required")
+        # TODO: GLES3
     ELSE()
         SET(OPENGL_HEADER1 "#include <GLES2/gl2.h>" CACHE STRING "#include<> line for OpenGL Header")
         SET(OPENGL_HEADER2 "" CACHE STRING "#include<> line for additional OpenGL Headers if required")
+        # TODO: GLES3
     ENDIF()
 ELSE()
     IF (APPLE)
@@ -542,6 +548,12 @@ ELSE()
     SET(OSG_GLES2_FEATURES "false")
 ENDIF()
 
+IF (OSG_GLES3_AVAILABLE)
+    SET(OSG_GLES3_FEATURES "true")
+ELSE()
+    SET(OSG_GLES3_FEATURES "false")
+ENDIF()
+
 IF(ANDROID)
     IF(OSG_GLES1_AVAILABLE)
         FIND_PATH(OPENGL_INCLUDE_DIR GLES/gl.h

README.txt

@@ -166,7 +166,7 @@ Section 3. Release notes on iOS build, by Thomas Hoghart
   This will give us the static build we need for iPhone.
 * Disable OSG_GL1_AVAILABLE, OSG_GL2_AVAILABLE, OSG_GL3_AVAILABLE,
   OSG_GL_DISPLAYLISTS_AVAILABLE, OSG_GL_VERTEX_FUNCS_AVAILABLE
-* Enable OSG_GLES1_AVAILABLE *OR* OSG_GLES2_AVAILABLE
+* Enable OSG_GLES1_AVAILABLE *OR* OSG_GLES2_AVAILABLE *OR* OSG_GLES3_AVAILABLE (GLES3 will enable GLES2 features)
 * Ensure OSG_WINDOWING_SYSTEM is set to IOS
 * Change FREETYPE include and library paths to an iPhone version
   (OpenFrameworks has one bundled with its distribution)

src/osg/GL.in

@@ -22,6 +22,7 @@
 #cmakedefine OSG_GL3_AVAILABLE
 #cmakedefine OSG_GLES1_AVAILABLE
 #cmakedefine OSG_GLES2_AVAILABLE
+#cmakedefine OSG_GLES3_AVAILABLE
 #cmakedefine OSG_GL_LIBRARY_STATIC
 #cmakedefine OSG_GL_DISPLAYLISTS_AVAILABLE
 #cmakedefine OSG_GL_MATRICES_AVAILABLE
@@ -34,6 +35,7 @@
 #define OSG_GL3_FEATURES @OSG_GL3_FEATURES@
 #define OSG_GLES1_FEATURES @OSG_GLES1_FEATURES@
 #define OSG_GLES2_FEATURES @OSG_GLES2_FEATURES@
+#define OSG_GLES3_FEATURES @OSG_GLES3_FEATURES@
 
 #ifndef WIN32
 

src/osgPlugins/imageio/ReaderWriterImageIO.cpp

@@ -47,6 +47,9 @@
 #include <sstream> // for istream
 #include <iostream> // for ios::
 
+#ifndef GL_BGRA_EXT
+#    define GL_BGRA_EXT GL_BGRA
+#endif
 
 /**************************************************************
  ***** Begin Callback functions for istream block reading *****

src/osgViewer/GraphicsWindowIOS.mm

@@ -10,6 +10,10 @@
     #import <OpenGLES/ES1/glext.h>
 #else
     #import <OpenGLES/ES2/glext.h>
+    #if defined(OSG_GLES3_FEATURES)
+        #import <OpenGLES/ES3/glext.h>
+    #endif
+
     // in GLES2, the OES suffix if dropped from function names (from rti)
     #define glGenFramebuffersOES glGenFramebuffers
     #define glGenRenderbuffersOES glGenRenderbuffers
@@ -513,7 +517,24 @@ typedef std::map<void*, unsigned int> TouchPointsIdMapping;
         glResolveMultisampleFramebufferAPPLE();
 
         GLenum attachments[] = {GL_DEPTH_ATTACHMENT_OES, GL_COLOR_ATTACHMENT0_OES};
+    #ifdef OSG_GLES3_FEATURES
+        switch ([_context API])
+        {
+            case kEAGLRenderingAPIOpenGLES3:
+                glBlitFramebuffer(0, 0, _backingWidth, _backingHeight,
+                                  0, 0, _backingWidth, _backingHeight,
+                                  GL_COLOR_BUFFER_BIT, GL_LINEAR);
+                glInvalidateFramebuffer(GL_READ_FRAMEBUFFER_APPLE, 2, attachments);
+                break;
+
+            default:
+                glResolveMultisampleFramebufferAPPLE();
                 glDiscardFramebufferEXT(GL_READ_FRAMEBUFFER_APPLE, 2, attachments);
+                break;
+        }
+    #else
+        glDiscardFramebufferEXT(GL_READ_FRAMEBUFFER_APPLE, 2, attachments);
+    #endif
     }
 #endif
 
@@ -860,6 +881,11 @@ bool GraphicsWindowIOS::realizeImplementation()
 #if OSG_GLES1_FEATURES
     _context = [[EAGLContext alloc] initWithAPI:kEAGLRenderingAPIOpenGLES1];
 #elif OSG_GLES2_FEATURES
+    #if OSG_GLES3_FEATURES
+        _context = [[EAGLContext alloc] initWithAPI:kEAGLRenderingAPIOpenGLES3];
+    #endif
+
+    if (!_context)
         _context = [[EAGLContext alloc] initWithAPI:kEAGLRenderingAPIOpenGLES2];
 #endif
 
@@ -868,8 +894,12 @@ bool GraphicsWindowIOS::realizeImplementation()
         #if OSG_GLES1_FEATURES
         OSG_FATAL << "GraphicsWindowIOS::realizeImplementation: ERROR: Failed to create a valid OpenGLES1 context" << std::endl;
         #elif OSG_GLES2_FEATURES
+            #if OSG_GLES3_FEATURES
+        OSG_FATAL << "GraphicsWindowIOS::realizeImplementation: ERROR: Failed to create a valid OpenGLES3 or OpenGLES2 context" << std::endl;
+            #else
         OSG_FATAL << "GraphicsWindowIOS::realizeImplementation: ERROR: Failed to create a valid OpenGLES2 context" << std::endl;
             #endif
+        #endif
         return false;
     }