diff --git a/include/osg/GL2Extensions b/include/osg/GL2Extensions
index 446b16741..d07077fcf 100644
--- a/include/osg/GL2Extensions
+++ b/include/osg/GL2Extensions
@@ -377,6 +377,29 @@ typedef char GLchar;
 #define GL_INT_SAMPLER_BUFFER             0x8DD0
 #define GL_UNSIGNED_INT_SAMPLER_2D_RECT   0x8DD5
 #define GL_UNSIGNED_INT_SAMPLER_BUFFER    0x8DD8
+#define GL_TEXTURE_BUFFER                 0x8C2A
+#define GL_MAX_TEXTURE_BUFFER_SIZE        0x8C2B
+#define GL_TEXTURE_BINDING_BUFFER         0x8C2C
+#define GL_TEXTURE_BUFFER_DATA_STORE_BINDING 0x8C2D
+#define GL_TEXTURE_RECTANGLE              0x84F5
+#define GL_TEXTURE_BINDING_RECTANGLE      0x84F6
+#define GL_PROXY_TEXTURE_RECTANGLE        0x84F7
+#define GL_MAX_RECTANGLE_TEXTURE_SIZE     0x84F8
+#define GL_RED_SNORM                      0x8F90
+#define GL_RG_SNORM                       0x8F91
+#define GL_RGB_SNORM                      0x8F92
+#define GL_RGBA_SNORM                     0x8F93
+#define GL_R8_SNORM                       0x8F94
+#define GL_RG8_SNORM                      0x8F95
+#define GL_RGB8_SNORM                     0x8F96
+#define GL_RGBA8_SNORM                    0x8F97
+#define GL_R16_SNORM                      0x8F98
+#define GL_RG16_SNORM                     0x8F99
+#define GL_RGB16_SNORM                    0x8F9A
+#define GL_RGBA16_SNORM                   0x8F9B
+#define GL_SIGNED_NORMALIZED              0x8F9C
+#define GL_PRIMITIVE_RESTART              0x8F9D
+#define GL_PRIMITIVE_RESTART_INDEX        0x8F9E
 #endif
 
 #ifndef GL_VERSION_4_0
diff --git a/include/osg/Texture b/include/osg/Texture
index 899a6df8b..a7a09670d 100644
--- a/include/osg/Texture
+++ b/include/osg/Texture
@@ -302,6 +302,38 @@
     #define GL_RGBA_INTEGER_MODE_EXT                           0x8D9E
 #endif
 
+
+#ifndef GL_ARB_texture_rg
+    #define GL_RG                             0x8227
+    #define GL_RG_INTEGER                     0x8228
+    #define GL_R8                             0x8229
+    #define GL_R16                            0x822A
+    #define GL_RG8                            0x822B
+    #define GL_RG16                           0x822C
+    #define GL_R16F                           0x822D
+    #define GL_R32F                           0x822E
+    #define GL_RG16F                          0x822F
+    #define GL_RG32F                          0x8230
+    #define GL_R8I                            0x8231
+    #define GL_R8UI                           0x8232
+    #define GL_R16I                           0x8233
+    #define GL_R16UI                          0x8234
+    #define GL_R32I                           0x8235
+    #define GL_R32UI                          0x8236
+    #define GL_RG8I                           0x8237
+    #define GL_RG8UI                          0x8238
+    #define GL_RG16I                          0x8239
+    #define GL_RG16UI                         0x823A
+    #define GL_RG32I                          0x823B
+    #define GL_RG32UI                         0x823C
+#endif
+
+#ifndef GL_ARB_half_float_pixel
+    #define GL_HALF_FLOAT                     0x140B
+#endif
+
+
+
 namespace osg {