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CHAPTER 9: User Interface
init {
fetchVersion()
// Create an OpenGL ES 2.0
context
setEGLContextClientVersion(2)
// We set the 2.x context factory to use for
//
the view
setEGLContextFactory()
// We set the renderer for drawing the graphics
renderer = MyGLRenderer()
setRenderer(renderer)
// This setting prevents
the GLSurfaceView frame
// from being redrawn until you call
// requestRender()
renderMode = GLSurfaceView.RENDERMODE_WHEN_DIRTY
}
private fun fetchVersion() {
val activityManager =
context.getSystemService(
Context.ACTIVITY_SERVICE)
as ActivityManager
val configurationInfo =
activityManager.deviceConfigurationInfo
val vers = configurationInfo.glEsVersion
// e.g. "2.0"
supports3x = vers.split(".")[0] == "3"
minVers = vers.split(".")[1].toInt()
Log.i("LOG", "Supports OpenGL 3.x = " +
supports3x)
Log.i("LOG", "OpenGL minor version = " +
minVers)
}
private fun setEGLContextFactory() {
val EGL_CONTEXT_CLIENT_VERSION = 0x3098
// from egl.h
c-source
class ContextFactory :
GLSurfaceView.EGLContextFactory {
override fun createContext(egl: EGL10,
display: javax.microedition.khronos.
egl.EGLDisplay?,
eglConfig: javax.microedition.khronos.
egl.EGLConfig?)
:javax.microedition.khronos.egl.EGLContext? {
val attrib_list =
intArrayOf(EGL_CONTEXT_CLIENT_VERSION,
2, EGL10.EGL_NONE)
val ectx = egl.eglCreateContext(display,
