Native activity now draws!

Very simple and dumb, but we now get touch events and fill the
window with a color (using OpenGL) based on its location.

Change-Id: I6657d2bb013570238bc0fe639f33c59f1ab68872

ndk/samples/native-activity/jni/glutils.h

@@ -0,0 +1,32 @@
+/*
+ * Copyright (C) 2010 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+#include <android/native_activity.h>
+#include <android/log.h>
+
+#include <EGL/egl.h>
+#include <GLES/gl.h>
+#include <GLES/glext.h>
+
+#define LOGI(...) ((void)__android_log_print(ANDROID_LOG_INFO, "native-activity", __VA_ARGS__))
+#define LOGW(...) ((void)__android_log_print(ANDROID_LOG_WARN, "native-activity", __VA_ARGS__))
+
+extern const char *EGLstrerror(EGLint err);
+extern int32_t selectConfigForPixelFormat(EGLDisplay dpy, EGLint const* attrs,
+        int32_t format, EGLConfig* outConfig);
+extern int32_t selectConfigForNativeWindow(EGLDisplay dpy, EGLint const* attrs,
+        EGLNativeWindowType window, EGLConfig* outConfig);