android-ndk, glGenVertexArraysOES not found

Question

I want to use VAO in my native-c application for Android.

The problem is, that GL_OES_vertex_array_object is supported and I can even get the addresses of glBindVertexArrayOES and glDeleteVertexArraysOES but glGenVertexArraysOES is not found.

Does the presence of GL_OES_vertex_array_object mean that all these functions can be accessed?

My code for VAO initialization:

std::string vao = "GL_OES_vertex_array_object";

if ( isExtensionSupported ( vao.c_str () ) != 0 )
{
    LOG ( vao << " supported" );
    glBindVertexArrayOES = (PFNGLBINDVERTEXARRAYOESPROC)eglGetProcAddress ( "glBindVertexArrayOES" );
    if ( !glBindVertexArrayOES )
        LOG ( "Can't get proc address: glBindVertexArrayOES" );

    glDeleteVertexArraysOES = (PFNGLDELETEVERTEXARRAYSOESPROC)eglGetProcAddress ( "glDeleteVertexArraysOES" );
    if ( !glDeleteVertexArraysOES )
        LOG ( "Can't get proc address: glDeleteVertexArraysOES" );

    glGenVertexArraysOES = (PFNGLGENVERTEXARRAYSOESPROC)eglGetProcAddress ( "glGenVertexArraysOES" );
    if ( glGenVertexArraysOES )
        LOG ( "Can't get proc address: glGenVertexArraysOES" );
}
else
{
    LOG ( vao << " not supported" );
}

Of course I get the log message

Can't get proc address: glGenVertexArraysOES

My Android.mk (shortened a little bit):

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)

LOCAL_MODULE    := smart
LOCAL_SRC_FILES := Base/Node.cpp
...

LOCAL_LDLIBS    := -llog -landroid -lGLESv2 -lEGL
LOCAL_STATIC_LIBRARIES := nv_and_util

include $(BUILD_SHARED_LIBRARY)

$(call import-add-path, C:/NVPACK/TDK_Samples/tegra_android_native_samples_v10p00/libs/jni)
$(call import-module,nv_and_util)

Device model Samsung i9003 with Android 2.3.5

Answer 1

I just tested this....

Replace:

#include <GLES2/gl2ext.h>

With this:

#define GL_GLEXT_PROTOTYPES
#include <GLES2/gl2ext.h>

The macro GL_GLEXT_PROTOTYPES must be defined before you include gl2ext.h. There is no need to define the functions, explicitly.

Answer 2

If that's really your code, then the bug is you're missing a '!'. Compare:

if ( !glDeleteVertexArraysOES )

to

if ( glGenVertexArraysOES )