Added openGL macro JUCE_GLSL_VERSION

modules/juce_opengl/juce_opengl.h

@@ -63,7 +63,6 @@
  #endif
 #elif JUCE_MAC
  #if defined (MAC_OS_X_VERSION_10_7) && (MAC_OS_X_VERSION_MIN_REQUIRED >= MAC_OS_X_VERSION_10_7)
-  #define JUCE_OPENGL3  1
   #include <OpenGL/gl3.h>
   #include <OpenGL/gl3ext.h>
  #else
@@ -74,6 +73,24 @@
  #include <GLES2/gl2.h>
 #endif
 
+#if GL_VERSION_3_2 || GL_ES_VERSION_3_0
+ #define JUCE_OPENGL3  1
+#endif
+
+//=============================================================================
+/** This macro is a helper for use in GLSL shader code which needs to compile on both OpenGL 2.1 and OpenGL 3.0.
+    It's mandatory in OpenGL 3.0 to specify the GLSL version.
+*/
+#if JUCE_OPENGL3
+ #if JUCE_OPENGL_ES
+  #define JUCE_GLSL_VERSION "#version 300 es"
+ #else
+  #define JUCE_GLSL_VERSION "#version 150"
+ #endif
+#else
+ #define JUCE_GLSL_VERSION ""
+#endif
+
 //=============================================================================
 #if JUCE_OPENGL_ES || defined (DOXYGEN)
  /** This macro is a helper for use in GLSL shader code which needs to compile on both GLES and desktop GL.

modules/juce_opengl/opengl/juce_OpenGLHelpers.cpp

@@ -81,8 +81,8 @@ String OpenGLHelpers::translateVertexShaderToV3 (const String& code)
 {
    #if JUCE_OPENGL3
     if (OpenGLShaderProgram::getLanguageVersion() > 1.2)
-        return "#version 150\n" + code.replace ("attribute", "in")
-                                      .replace ("varying", "out");
+        return JUCE_GLSL_VERSION "\n" + code.replace ("attribute", "in")
+                                            .replace ("varying", "out");
    #endif
 
     return code;
@@ -92,7 +92,7 @@ String OpenGLHelpers::translateFragmentShaderToV3 (const String& code)
 {
    #if JUCE_OPENGL3
     if (OpenGLShaderProgram::getLanguageVersion() > 1.2)
-        return "#version 150\n"
+        return JUCE_GLSL_VERSION "\n"
                "out vec4 fragColor;\n"
                 + code.replace ("varying", "in")
                       .replace ("texture2D", "texture")