openGL基础

package com.screenrecord.anychat.opengl

import android.content.Context
import android.opengl.GLES20
import android.opengl.GLSurfaceView
import android.support.v7.app.AppCompatActivity
import android.os.Bundle
import javax.microedition.khronos.egl.EGLConfig
import javax.microedition.khronos.opengles.GL10

class OpenGL2Activity : AppCompatActivity() {


    var mGlSurface: GLSurfaceView? = null
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        mGlSurface = MyGLSurfaceView(this)
        mGlSurface?.setRenderer(MyGLRender())
        setContentView(mGlSurface)
    }


    class MyGLSurfaceView(context: Context): GLSurfaceView(context){
        private var mGLRender:MyGLRender ?= null

        init {
            setEGLContextClientVersion(2)
            mGLRender = MyGLRender()
        }
    }

    class MyGLRender: GLSurfaceView.Renderer{


        override fun onSurfaceCreated(gl: GL10?, config: EGLConfig?) {
            GLES20.glClearColor(0f,0f,0f,1f)
        }

        override fun onSurfaceChanged(gl: GL10?, width: Int, height: Int) {
            GLES20.glViewport(0, 0, width, height)
        }


        override fun onDrawFrame(gl: GL10?) {
            GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT)
        }
    }
}