fixed #1229, reduce the requirement of gles20 branch from NDK android-10 to android-8 level (official android 2.2 image, the lowest version which supports OpenGL ES 2.0), remove EGL dependency.

cocos2dx/Android.mk

@@ -170,8 +170,7 @@ LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/ \
 
 LOCAL_EXPORT_LDLIBS := -llog\
                        -lz \
-                       -lGLESv2 \
-                       -lEGL
+                       -lGLESv2
 
 LOCAL_C_INCLUDES := $(LOCAL_PATH)/ \
                     $(LOCAL_PATH)/actions \

cocos2dx/platform/android/CCEGLView.cpp

@@ -30,18 +30,23 @@ THE SOFTWARE.
 #include "jni/MessageJni.h"
 
 #include <stdlib.h>
-#include "CCGL.h"
-#include <EGL/egl.h>
 #include <android/log.h>
+#include "CCGL.h"
 
-PFNGLGENVERTEXARRAYSOESPROC glGenVertexArraysOESEXT = 0;
-PFNGLBINDVERTEXARRAYOESPROC glBindVertexArrayOESEXT = 0;
-PFNGLDELETEVERTEXARRAYSOESPROC glDeleteVertexArraysOESEXT = 0;
+
+#if CC_TEXTURE_ATLAS_USE_VAO
+  #include <EGL/egl.h>
+  PFNGLGENVERTEXARRAYSOESPROC glGenVertexArraysOESEXT = 0;
+  PFNGLBINDVERTEXARRAYOESPROC glBindVertexArrayOESEXT = 0;
+  PFNGLDELETEVERTEXARRAYSOESPROC glDeleteVertexArraysOESEXT = 0;
+#endif
 
 void initExtensions() {
+#if CC_TEXTURE_ATLAS_USE_VAO
      glGenVertexArraysOESEXT = (PFNGLGENVERTEXARRAYSOESPROC)eglGetProcAddress("glGenVertexArraysOES");
      glBindVertexArrayOESEXT = (PFNGLBINDVERTEXARRAYOESPROC)eglGetProcAddress("glBindVertexArrayOES");
      glDeleteVertexArraysOESEXT = (PFNGLDELETEVERTEXARRAYSOESPROC)eglGetProcAddress("glDeleteVertexArraysOES");
+#endif
 }
 
 NS_CC_BEGIN

tests/proj.android/project.properties

@@ -8,4 +8,4 @@
 # project structure.
 
 # Project target.
-target=android-10
+target=android-8