samples/BasicGLSurfaceView/src/com/example/android/basicglsurfaceview/GLES20TriangleRenderer.java - platform/development - Git at Google

 /*
  * Copyright (C) 2011 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.
  */

 package com.example.android.basicglsurfaceview;

 import java.io.IOException;
 import java.io.InputStream;
 import java.nio.ByteBuffer;
 import java.nio.ByteOrder;
 import java.nio.FloatBuffer;

 import javax.microedition.khronos.egl.EGLConfig;
 import javax.microedition.khronos.opengles.GL10;

 import android.content.Context;
 import android.graphics.Bitmap;
 import android.graphics.BitmapFactory;
 import android.opengl.GLES20;
 import android.opengl.GLSurfaceView;
 import android.opengl.GLUtils;
 import android.opengl.Matrix;
 import android.os.SystemClock;
 import android.util.Log;

 class GLES20TriangleRenderer implements GLSurfaceView.Renderer {

     public GLES20TriangleRenderer(Context context) {
         mContext = context;
         mTriangleVertices = ByteBuffer.allocateDirect(mTriangleVerticesData.length
                 * FLOAT_SIZE_BYTES).order(ByteOrder.nativeOrder()).asFloatBuffer();
         mTriangleVertices.put(mTriangleVerticesData).position(0);
     }

     public void onDrawFrame(GL10 glUnused) {
         // Ignore the passed-in GL10 interface, and use the GLES20
         // class's static methods instead.
         GLES20.glClearColor(0.0f, 0.0f, 1.0f, 1.0f);
         GLES20.glClear( GLES20.GL_DEPTH_BUFFER_BIT | GLES20.GL_COLOR_BUFFER_BIT);
         GLES20.glUseProgram(mProgram);
         checkGlError("glUseProgram");

         GLES20.glActiveTexture(GLES20.GL_TEXTURE0);
         GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, mTextureID);

         mTriangleVertices.position(TRIANGLE_VERTICES_DATA_POS_OFFSET);
         GLES20.glVertexAttribPointer(maPositionHandle, 3, GLES20.GL_FLOAT, false,
                 TRIANGLE_VERTICES_DATA_STRIDE_BYTES, mTriangleVertices);
         checkGlError("glVertexAttribPointer maPosition");
         mTriangleVertices.position(TRIANGLE_VERTICES_DATA_UV_OFFSET);
         GLES20.glEnableVertexAttribArray(maPositionHandle);
         checkGlError("glEnableVertexAttribArray maPositionHandle");
         GLES20.glVertexAttribPointer(maTextureHandle, 2, GLES20.GL_FLOAT, false,
                 TRIANGLE_VERTICES_DATA_STRIDE_BYTES, mTriangleVertices);
         checkGlError("glVertexAttribPointer maTextureHandle");
         GLES20.glEnableVertexAttribArray(maTextureHandle);
         checkGlError("glEnableVertexAttribArray maTextureHandle");

         long time = SystemClock.uptimeMillis() % 4000L;
         float angle = 0.090f * ((int) time);
         Matrix.setRotateM(mMMatrix, 0, angle, 0, 0, 1.0f);
         Matrix.multiplyMM(mMVPMatrix, 0, mVMatrix, 0, mMMatrix, 0);
         Matrix.multiplyMM(mMVPMatrix, 0, mProjMatrix, 0, mMVPMatrix, 0);

         GLES20.glUniformMatrix4fv(muMVPMatrixHandle, 1, false, mMVPMatrix, 0);
         GLES20.glDrawArrays(GLES20.GL_TRIANGLES, 0, 3);
         checkGlError("glDrawArrays");
     }

     public void onSurfaceChanged(GL10 glUnused, int width, int height) {
         // Ignore the passed-in GL10 interface, and use the GLES20
         // class's static methods instead.
         GLES20.glViewport(0, 0, width, height);
         float ratio = (float) width / height;
         Matrix.frustumM(mProjMatrix, 0, -ratio, ratio, -1, 1, 3, 7);
     }

     public void onSurfaceCreated(GL10 glUnused, EGLConfig config) {
         // Ignore the passed-in GL10 interface, and use the GLES20
         // class's static methods instead.
         mProgram = createProgram(mVertexShader, mFragmentShader);
         if (mProgram == 0) {
             return;
         }
         maPositionHandle = GLES20.glGetAttribLocation(mProgram, "aPosition");
         checkGlError("glGetAttribLocation aPosition");
         if (maPositionHandle == -1) {
             throw new RuntimeException("Could not get attrib location for aPosition");
         }
         maTextureHandle = GLES20.glGetAttribLocation(mProgram, "aTextureCoord");
         checkGlError("glGetAttribLocation aTextureCoord");
         if (maTextureHandle == -1) {
             throw new RuntimeException("Could not get attrib location for aTextureCoord");
         }

         muMVPMatrixHandle = GLES20.glGetUniformLocation(mProgram, "uMVPMatrix");
         checkGlError("glGetUniformLocation uMVPMatrix");
         if (muMVPMatrixHandle == -1) {
             throw new RuntimeException("Could not get attrib location for uMVPMatrix");
         }

         /*
          * Create our texture. This has to be done each time the
          * surface is created.
          */

         int[] textures = new int[1];
         GLES20.glGenTextures(1, textures, 0);

         mTextureID = textures[0];
         GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, mTextureID);

         GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MIN_FILTER,
                 GLES20.GL_NEAREST);
         GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D,
                 GLES20.GL_TEXTURE_MAG_FILTER,
                 GLES20.GL_LINEAR);

         GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_S,
                 GLES20.GL_REPEAT);
         GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_T,
                 GLES20.GL_REPEAT);

         InputStream is = mContext.getResources()
             .openRawResource(R.raw.robot);
         Bitmap bitmap;
         try {
             bitmap = BitmapFactory.decodeStream(is);
         } finally {
             try {
                 is.close();
             } catch(IOException e) {
                 // Ignore.
             }
         }

         GLUtils.texImage2D(GLES20.GL_TEXTURE_2D, 0, bitmap, 0);
         bitmap.recycle();

         Matrix.setLookAtM(mVMatrix, 0, 0, 0, -5, 0f, 0f, 0f, 0f, 1.0f, 0.0f);
     }

     private int loadShader(int shaderType, String source) {
         int shader = GLES20.glCreateShader(shaderType);
         if (shader != 0) {
             GLES20.glShaderSource(shader, source);
             GLES20.glCompileShader(shader);
             int[] compiled = new int[1];
             GLES20.glGetShaderiv(shader, GLES20.GL_COMPILE_STATUS, compiled, 0);
             if (compiled[0] == 0) {
                 Log.e(TAG, "Could not compile shader " + shaderType + ":");
                 Log.e(TAG, GLES20.glGetShaderInfoLog(shader));
                 GLES20.glDeleteShader(shader);
                 shader = 0;
             }
         }
         return shader;
     }

     private int createProgram(String vertexSource, String fragmentSource) {
         int vertexShader = loadShader(GLES20.GL_VERTEX_SHADER, vertexSource);
         if (vertexShader == 0) {
             return 0;
         }

         int pixelShader = loadShader(GLES20.GL_FRAGMENT_SHADER, fragmentSource);
         if (pixelShader == 0) {
             return 0;
         }

         int program = GLES20.glCreateProgram();
         if (program != 0) {
             GLES20.glAttachShader(program, vertexShader);
             checkGlError("glAttachShader");
             GLES20.glAttachShader(program, pixelShader);
             checkGlError("glAttachShader");
             GLES20.glLinkProgram(program);
             int[] linkStatus = new int[1];
             GLES20.glGetProgramiv(program, GLES20.GL_LINK_STATUS, linkStatus, 0);
             if (linkStatus[0] != GLES20.GL_TRUE) {
                 Log.e(TAG, "Could not link program: ");
                 Log.e(TAG, GLES20.glGetProgramInfoLog(program));
                 GLES20.glDeleteProgram(program);
                 program = 0;
             }
         }
         return program;
     }

     private void checkGlError(String op) {
         int error;
         while ((error = GLES20.glGetError()) != GLES20.GL_NO_ERROR) {
             Log.e(TAG, op + ": glError " + error);
             throw new RuntimeException(op + ": glError " + error);
         }
     }

     private static final int FLOAT_SIZE_BYTES = 4;
     private static final int TRIANGLE_VERTICES_DATA_STRIDE_BYTES = 5 * FLOAT_SIZE_BYTES;
     private static final int TRIANGLE_VERTICES_DATA_POS_OFFSET = 0;
     private static final int TRIANGLE_VERTICES_DATA_UV_OFFSET = 3;
     private final float[] mTriangleVerticesData = {
             // X, Y, Z, U, V
             -1.0f, -0.5f, 0, -0.5f, 0.0f,
             1.0f, -0.5f, 0, 1.5f, -0.0f,
             0.0f,  1.11803399f, 0, 0.5f,  1.61803399f };

     private FloatBuffer mTriangleVertices;

     private final String mVertexShader =
         "uniform mat4 uMVPMatrix;\n" +
         "attribute vec4 aPosition;\n" +
         "attribute vec2 aTextureCoord;\n" +
         "varying vec2 vTextureCoord;\n" +
         "void main() {\n" +
         "  gl_Position = uMVPMatrix * aPosition;\n" +
         "  vTextureCoord = aTextureCoord;\n" +
         "}\n";

     private final String mFragmentShader =
         "precision mediump float;\n" +
         "varying vec2 vTextureCoord;\n" +
         "uniform sampler2D sTexture;\n" +
         "void main() {\n" +
         "  gl_FragColor = texture2D(sTexture, vTextureCoord);\n" +
         "}\n";

     private float[] mMVPMatrix = new float[16];
     private float[] mProjMatrix = new float[16];
     private float[] mMMatrix = new float[16];
     private float[] mVMatrix = new float[16];

     private int mProgram;
     private int mTextureID;
     private int muMVPMatrixHandle;
     private int maPositionHandle;
     private int maTextureHandle;

     private Context mContext;
     private static String TAG = "GLES20TriangleRenderer";
 }
	/*
	* Copyright (C) 2011 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.
	*/

	package com.example.android.basicglsurfaceview;

	import java.io.IOException;
	import java.io.InputStream;
	import java.nio.ByteBuffer;
	import java.nio.ByteOrder;
	import java.nio.FloatBuffer;

	import javax.microedition.khronos.egl.EGLConfig;
	import javax.microedition.khronos.opengles.GL10;

	import android.content.Context;
	import android.graphics.Bitmap;
	import android.graphics.BitmapFactory;
	import android.opengl.GLES20;
	import android.opengl.GLSurfaceView;
	import android.opengl.GLUtils;
	import android.opengl.Matrix;
	import android.os.SystemClock;
	import android.util.Log;

	class GLES20TriangleRenderer implements GLSurfaceView.Renderer {

	public GLES20TriangleRenderer(Context context) {
	mContext = context;
	mTriangleVertices = ByteBuffer.allocateDirect(mTriangleVerticesData.length
	* FLOAT_SIZE_BYTES).order(ByteOrder.nativeOrder()).asFloatBuffer();
	mTriangleVertices.put(mTriangleVerticesData).position(0);
	}

	public void onDrawFrame(GL10 glUnused) {
	// Ignore the passed-in GL10 interface, and use the GLES20
	// class's static methods instead.
	GLES20.glClearColor(0.0f, 0.0f, 1.0f, 1.0f);
	GLES20.glClear( GLES20.GL_DEPTH_BUFFER_BIT \| GLES20.GL_COLOR_BUFFER_BIT);
	GLES20.glUseProgram(mProgram);
	checkGlError("glUseProgram");

	GLES20.glActiveTexture(GLES20.GL_TEXTURE0);
	GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, mTextureID);

	mTriangleVertices.position(TRIANGLE_VERTICES_DATA_POS_OFFSET);
	GLES20.glVertexAttribPointer(maPositionHandle, 3, GLES20.GL_FLOAT, false,
	TRIANGLE_VERTICES_DATA_STRIDE_BYTES, mTriangleVertices);
	checkGlError("glVertexAttribPointer maPosition");
	mTriangleVertices.position(TRIANGLE_VERTICES_DATA_UV_OFFSET);
	GLES20.glEnableVertexAttribArray(maPositionHandle);
	checkGlError("glEnableVertexAttribArray maPositionHandle");
	GLES20.glVertexAttribPointer(maTextureHandle, 2, GLES20.GL_FLOAT, false,
	TRIANGLE_VERTICES_DATA_STRIDE_BYTES, mTriangleVertices);
	checkGlError("glVertexAttribPointer maTextureHandle");
	GLES20.glEnableVertexAttribArray(maTextureHandle);
	checkGlError("glEnableVertexAttribArray maTextureHandle");

	long time = SystemClock.uptimeMillis() % 4000L;
	float angle = 0.090f * ((int) time);
	Matrix.setRotateM(mMMatrix, 0, angle, 0, 0, 1.0f);
	Matrix.multiplyMM(mMVPMatrix, 0, mVMatrix, 0, mMMatrix, 0);
	Matrix.multiplyMM(mMVPMatrix, 0, mProjMatrix, 0, mMVPMatrix, 0);

	GLES20.glUniformMatrix4fv(muMVPMatrixHandle, 1, false, mMVPMatrix, 0);
	GLES20.glDrawArrays(GLES20.GL_TRIANGLES, 0, 3);
	checkGlError("glDrawArrays");
	}

	public void onSurfaceChanged(GL10 glUnused, int width, int height) {
	// Ignore the passed-in GL10 interface, and use the GLES20
	// class's static methods instead.
	GLES20.glViewport(0, 0, width, height);
	float ratio = (float) width / height;
	Matrix.frustumM(mProjMatrix, 0, -ratio, ratio, -1, 1, 3, 7);
	}

	public void onSurfaceCreated(GL10 glUnused, EGLConfig config) {
	// Ignore the passed-in GL10 interface, and use the GLES20
	// class's static methods instead.
	mProgram = createProgram(mVertexShader, mFragmentShader);
	if (mProgram == 0) {
	return;
	}
	maPositionHandle = GLES20.glGetAttribLocation(mProgram, "aPosition");
	checkGlError("glGetAttribLocation aPosition");
	if (maPositionHandle == -1) {
	throw new RuntimeException("Could not get attrib location for aPosition");
	}
	maTextureHandle = GLES20.glGetAttribLocation(mProgram, "aTextureCoord");
	checkGlError("glGetAttribLocation aTextureCoord");
	if (maTextureHandle == -1) {
	throw new RuntimeException("Could not get attrib location for aTextureCoord");
	}

	muMVPMatrixHandle = GLES20.glGetUniformLocation(mProgram, "uMVPMatrix");
	checkGlError("glGetUniformLocation uMVPMatrix");
	if (muMVPMatrixHandle == -1) {
	throw new RuntimeException("Could not get attrib location for uMVPMatrix");
	}

	/*
	* Create our texture. This has to be done each time the
	* surface is created.
	*/

	int[] textures = new int[1];
	GLES20.glGenTextures(1, textures, 0);

	mTextureID = textures[0];
	GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, mTextureID);

	GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MIN_FILTER,
	GLES20.GL_NEAREST);
	GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D,
	GLES20.GL_TEXTURE_MAG_FILTER,
	GLES20.GL_LINEAR);

	GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_S,
	GLES20.GL_REPEAT);
	GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_T,
	GLES20.GL_REPEAT);

	InputStream is = mContext.getResources()
	.openRawResource(R.raw.robot);
	Bitmap bitmap;
	try {
	bitmap = BitmapFactory.decodeStream(is);
	} finally {
	try {
	is.close();
	} catch(IOException e) {
	// Ignore.
	}
	}

	GLUtils.texImage2D(GLES20.GL_TEXTURE_2D, 0, bitmap, 0);
	bitmap.recycle();

	Matrix.setLookAtM(mVMatrix, 0, 0, 0, -5, 0f, 0f, 0f, 0f, 1.0f, 0.0f);
	}

	private int loadShader(int shaderType, String source) {
	int shader = GLES20.glCreateShader(shaderType);
	if (shader != 0) {
	GLES20.glShaderSource(shader, source);
	GLES20.glCompileShader(shader);
	int[] compiled = new int[1];
	GLES20.glGetShaderiv(shader, GLES20.GL_COMPILE_STATUS, compiled, 0);
	if (compiled[0] == 0) {
	Log.e(TAG, "Could not compile shader " + shaderType + ":");
	Log.e(TAG, GLES20.glGetShaderInfoLog(shader));
	GLES20.glDeleteShader(shader);
	shader = 0;
	}
	}
	return shader;
	}

	private int createProgram(String vertexSource, String fragmentSource) {
	int vertexShader = loadShader(GLES20.GL_VERTEX_SHADER, vertexSource);
	if (vertexShader == 0) {
	return 0;
	}

	int pixelShader = loadShader(GLES20.GL_FRAGMENT_SHADER, fragmentSource);
	if (pixelShader == 0) {
	return 0;
	}

	int program = GLES20.glCreateProgram();
	if (program != 0) {
	GLES20.glAttachShader(program, vertexShader);
	checkGlError("glAttachShader");
	GLES20.glAttachShader(program, pixelShader);
	checkGlError("glAttachShader");
	GLES20.glLinkProgram(program);
	int[] linkStatus = new int[1];
	GLES20.glGetProgramiv(program, GLES20.GL_LINK_STATUS, linkStatus, 0);
	if (linkStatus[0] != GLES20.GL_TRUE) {
	Log.e(TAG, "Could not link program: ");
	Log.e(TAG, GLES20.glGetProgramInfoLog(program));
	GLES20.glDeleteProgram(program);
	program = 0;
	}
	}
	return program;
	}

	private void checkGlError(String op) {
	int error;
	while ((error = GLES20.glGetError()) != GLES20.GL_NO_ERROR) {
	Log.e(TAG, op + ": glError " + error);
	throw new RuntimeException(op + ": glError " + error);
	}
	}

	private static final int FLOAT_SIZE_BYTES = 4;
	private static final int TRIANGLE_VERTICES_DATA_STRIDE_BYTES = 5 * FLOAT_SIZE_BYTES;
	private static final int TRIANGLE_VERTICES_DATA_POS_OFFSET = 0;
	private static final int TRIANGLE_VERTICES_DATA_UV_OFFSET = 3;
	private final float[] mTriangleVerticesData = {
	// X, Y, Z, U, V
	-1.0f, -0.5f, 0, -0.5f, 0.0f,
	1.0f, -0.5f, 0, 1.5f, -0.0f,
	0.0f, 1.11803399f, 0, 0.5f, 1.61803399f };

	private FloatBuffer mTriangleVertices;

	private final String mVertexShader =
	"uniform mat4 uMVPMatrix;\n" +
	"attribute vec4 aPosition;\n" +
	"attribute vec2 aTextureCoord;\n" +
	"varying vec2 vTextureCoord;\n" +
	"void main() {\n" +
	" gl_Position = uMVPMatrix * aPosition;\n" +
	" vTextureCoord = aTextureCoord;\n" +
	"}\n";

	private final String mFragmentShader =
	"precision mediump float;\n" +
	"varying vec2 vTextureCoord;\n" +
	"uniform sampler2D sTexture;\n" +
	"void main() {\n" +
	" gl_FragColor = texture2D(sTexture, vTextureCoord);\n" +
	"}\n";

	private float[] mMVPMatrix = new float[16];
	private float[] mProjMatrix = new float[16];
	private float[] mMMatrix = new float[16];
	private float[] mVMatrix = new float[16];

	private int mProgram;
	private int mTextureID;
	private int muMVPMatrixHandle;
	private int maPositionHandle;
	private int maTextureHandle;

	private Context mContext;
	private static String TAG = "GLES20TriangleRenderer";
	}