这里简单运用之前所学的知识来实现一个对应的立方体：

public class MainActivity extends AppCompatActivity {RecyclerView mRecyclerView;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);intGL();}private GLSurfaceView mSurfaceView;@Overrideprotected void onPause() {super.onPause();if (mSurfaceView != null) {mSurfaceView.onPause();}}@Overrideprotected void onResume() {super.onResume();if (mSurfaceView != null) {mSurfaceView.onResume();}}private void intGL() {mSurfaceView = findViewById(R.id.gl);boolean isSupport=detectOpenGLES30();mSurfaceView.setEGLContextClientVersion(3);mSurfaceView.setEGLConfigChooser(8, 8, 8, 8, 16, 0);mSurfaceView.setRenderer(new MyRenderer());//RenderMode 有两种，RENDERMODE_WHEN_DIRTY 和 RENDERMODE_CONTINUOUSLY，// 前者是懒惰渲染，需要手动调用 glSurfaceView.requestRender() 才会进行更新，而后者则是不停渲染。mSurfaceView.setRenderMode(GLSurfaceView.RENDERMODE_CONTINUOUSLY);}private boolean detectOpenGLES30() {ActivityManager am = (ActivityManager)getSystemService(Context.ACTIVITY_SERVICE);ConfigurationInfo info = am.getDeviceConfigurationInfo();String resulr=Integer.toString(info.reqGlEsVersion, 16);return (info.reqGlEsVersion >= 0x30000);}private static class MyRenderer implements GLSurfaceView.Renderer {private Triangle mSquare;@Overridepublic void onSurfaceCreated(GL10 unused, EGLConfig config) {mSquare = new Triangle();}@Overridepublic void onSurfaceChanged(GL10 unused, int width, int height) {//设置 Screen space 的大小mSquare.onSurfaceChange(width,height);}//绘制的过程其实就是为 shader 代码变量赋值，并调用绘制命令的过程@Overridepublic void onDrawFrame(GL10 unused) {GLES30.glClear(GLES30.GL_COLOR_BUFFER_BIT | GLES30.GL_DEPTH_BUFFER_BIT);GLES30.glEnable(GLES20.GL_DEPTH_TEST);mSquare.onDraw();}}}

Triangle方法：

public class Triangle {private FloatBuffer vertexBuffer;private FloatBuffer colorBuffer;private ByteBuffer indicateBuffer;private final float[] projectionMatrix = new float[16];private final String vertexShaderCode ="#version 300 es  \n" +"layout(location = 0) in vec4 vPosition;\n" +"layout(location = 1) in vec4 aColor;\n" +"uniform mat4 aMatrix;\n" +"out vec4 vColor;" +"void main() {\n" +"gl_Position = aMatrix*vPosition;\n" +"vColor=aColor;\n" +"}";private final String fragmentShaderCode ="#version 300 es  \n" +"precision mediump float;\n" +"out vec4 fragColor;\n" +"in vec4 vColor;" +"void main() {\n" +"fragColor = vColor;\n" +"}";// number of coordinates per vertex in this arraystatic final int COORDS_PER_VERTEX = 3;static float triangleCoords[] = {0.5f, 0.5f, 0.5f,0.5f, 0.5f, -0.5f,-0.5f, 0.5f, 0.5f,-0.5f, 0.5f, -0.5f,0.5f, -0.5f, 0.5f,0.5f, -0.5f, -0.5f,-0.5f, -0.5f, 0.5f,-0.5f, -0.5f, -0.5f,};private final int mProgram;// Set color with red, green, blue and alpha (opacity) valuesfloat color[] = {0.0f, 1.0f, 0.0f,0.0f, 1.0f, 0.0f,1.0f, 0.5f, 0.0f,1.0f, 0.5f, 0.0f,1.0f, 0.0f, 0.0f,1.0f, 0.0f, 0.0f,0.0f, 0.0f, 1.0f,1.0f, 0.0f, 1.0f};byte indicates[] = {//上0, 1, 2,1, 2, 3,//下4, 5, 6,5, 6, 7,//左2, 3, 6,3, 6, 7,//右0, 1, 4,1, 4, 5,//前0, 2, 4,2, 4, 6,//后1, 3, 7,1, 7, 5};public static int loadShader(int type, String shaderCode) {// create a vertex shader type (GLES30.GL_VERTEX_SHADER)// or a fragment shader type (GLES30.GL_FRAGMENT_SHADER)int shader = GLES30.glCreateShader(type);// add the source code to the shader and compile itGLES30.glShaderSource(shader, shaderCode);GLES30.glCompileShader(shader);return shader;}public Triangle() {indicateBuffer = ByteBuffer.allocate(indicates.length);indicateBuffer.put(indicates);indicateBuffer.position(0);// initialize vertex byte buffer for shape coordinatesByteBuffer bb = ByteBuffer.allocateDirect(// (number of coordinate values * 4 bytes per float)triangleCoords.length * 4);// use the device hardware's native byte orderbb.order(ByteOrder.nativeOrder());// create a floating point buffer from the ByteBuffervertexBuffer = bb.asFloatBuffer();// add the coordinates to the FloatBuffervertexBuffer.put(triangleCoords);// set the buffer to read the first coordinatevertexBuffer.position(0);ByteBuffer bb1 = ByteBuffer.allocateDirect(// (number of coordinate values * 4 bytes per float)color.length * 4);// use the device hardware's native byte orderbb1.order(ByteOrder.nativeOrder());// create a floating point buffer from the ByteBuffercolorBuffer = bb1.asFloatBuffer();// add the coordinates to the FloatBuffercolorBuffer.put(color);// set the buffer to read the first coordinatecolorBuffer.position(0);int vertexShader = loadShader(GLES30.GL_VERTEX_SHADER,vertexShaderCode);int fragmentShader = loadShader(GLES30.GL_FRAGMENT_SHADER,fragmentShaderCode);// create empty OpenGL ES ProgrammProgram = GLES30.glCreateProgram();// add the vertex shader to programGLES30.glAttachShader(mProgram, vertexShader);// add the fragment shader to programGLES30.glAttachShader(mProgram, fragmentShader);// creates OpenGL ES program executablesGLES30.glLinkProgram(mProgram);}private int mPositionHandle;private int mColorHandle;private final int vertexCount = triangleCoords.length / COORDS_PER_VERTEX;private final int vertexStride = COORDS_PER_VERTEX * 4; // 4 bytes per vertexprivate final int colorStride = COORDS_PER_VERTEX * 4; // 4 bytes per vertexpublic void onDraw() {// Add program to OpenGL ES environment//        Matrix.translateM(projectionMatrix,0,-0.5f,0f,0f);float[] rotateF = new float[16];Matrix.setIdentityM(rotateF, 0);Matrix.setRotateM(rotateF,0,rotateAgree,0.5f,0.5f,0f);Matrix.multiplyMM(projectionMatrix,0,orthMatrix,0,rotateF,0);rotateAgree+=1;if (rotateAgree >=360) {rotateAgree=0;}GLES30.glUseProgram(mProgram);// get handle to vertex shader's vPosition membermPositionHandle = GLES30.glGetAttribLocation(mProgram, "vPosition");
//        createVertextBuffer();// Enable a handle to th、e triangle verticesGLES30.glEnableVertexAttribArray(mPositionHandle);// Prepare the triangle coordinate dataGLES30.glVertexAttribPointer(mPositionHandle, COORDS_PER_VERTEX,GLES30.GL_FLOAT, false,0, vertexBuffer);// get handle to fragment shader's vColor membermColorHandle = GLES30.glGetAttribLocation(mProgram, "aColor");int aMatrixPos = GLES30.glGetUniformLocation(mProgram, "aMatrix");GLES30.glUniformMatrix4fv(aMatrixPos,1,false,projectionMatrix,0);// Set color for drawing the triangle
//        GLES30.glVertexAttrib4fv(mColorHandle,  color, 0);GLES30.glEnableVertexAttribArray(mColorHandle);GLES30.glVertexAttribPointer(mColorHandle, 3,GLES30.GL_FLOAT, false,0, colorBuffer);// Draw the triangleGLES30.glDrawElements(GLES30.GL_TRIANGLES, indicates.length,GLES30.GL_UNSIGNED_BYTE, indicateBuffer);// Disable vertex arrayGLES30.glDisableVertexAttribArray(mPositionHandle);}int rotateAgree=0;float[] orthMatrix = new float[16];public void onSurfaceChange(int width, int height) {GLES30.glViewport(0, 0, width, height);final float aspectRatio = width > height ?((float) width / (float) height): ((float) height / (float) width);//正交投影Matrix.setIdentityM(orthMatrix, 0);if (width > height) {Matrix.orthoM(orthMatrix,0,-aspectRatio,aspectRatio,-1f,1f,-1f,1f);}else {Matrix.orthoM(orthMatrix, 0, -1f, 1f,-aspectRatio, aspectRatio, -1f, 1f);}}private void createVertextBuffer() {int[] value = new int[1];GLES30.glGenBuffers(1, value, 0);GLES30.glBindBuffer(GLES30.GL_ARRAY_BUFFER, value[0]);GLES30.glBufferData(GLES30.GL_ARRAY_BUFFER, vertexBuffer.capacity() * 4, vertexBuffer, GLES30.GL_STATIC_DRAW);}
}

代码效果如下所示：

gif图效果不好，手机上看还是很酷炫的，哈哈哈

代码地址：

https://github.com/JerryChan123/LearnOEL/tree/gl30 (opengl for cube v2为提交信息)