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/*
* Copyright (C) 2009 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.android.gl2java;
import android.content.Context;
import android.opengl.GLSurfaceView;
import android.util.AttributeSet;
import android.util.Log;
import android.view.KeyEvent;
import android.view.MotionEvent;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.FloatBuffer;
import javax.microedition.khronos.egl.EGL10;
import javax.microedition.khronos.egl.EGLConfig;
import javax.microedition.khronos.egl.EGLContext;
import javax.microedition.khronos.egl.EGLDisplay;
import javax.microedition.khronos.opengles.GL10;
import android.opengl.GLES20;
/**
* An implementation of SurfaceView that uses the dedicated surface for
* displaying an OpenGL animation. This allows the animation to run in a
* separate thread, without requiring that it be driven by the update mechanism
* of the view hierarchy.
*
* The application-specific rendering code is delegated to a GLView.Renderer
* instance.
*/
class GL2JavaView extends GLSurfaceView {
private static String TAG = "GL2JavaView";
public GL2JavaView(Context context) {
super(context);
setEGLContextClientVersion(2);
setRenderer(new Renderer());
}
private static class Renderer implements GLSurfaceView.Renderer {
public Renderer() {
mTriangleVertices = ByteBuffer.allocateDirect(mTriangleVerticesData.length * 4)
.order(ByteOrder.nativeOrder()).asFloatBuffer();
mTriangleVertices.put(mTriangleVerticesData).position(0);
}
public void onDrawFrame(GL10 gl) {
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.glVertexAttribPointer(mvPositionHandle, 2, GLES20.GL_FLOAT, false, 0, mTriangleVertices);
checkGlError("glVertexAttribPointer");
GLES20.glEnableVertexAttribArray(mvPositionHandle);
checkGlError("glEnableVertexAttribArray");
GLES20.glDrawArrays(GLES20.GL_TRIANGLES, 0, 3);
checkGlError("glDrawArrays");
}
public void onSurfaceChanged(GL10 gl, int width, int height) {
GLES20.glViewport(0, 0, width, height);
}
public void onSurfaceCreated(GL10 gl, EGLConfig config) {
mProgram = createProgram(mVertexShader, mFragmentShader);
if (mProgram == 0) {
return;
}
mvPositionHandle = GLES20.glGetAttribLocation(mProgram, "vPosition");
checkGlError("glGetAttribLocation");
if (mvPositionHandle == -1) {
throw new RuntimeException("Could not get attrib location for vPosition");
}
}
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 final float[] mTriangleVerticesData = { 0.0f, 0.5f, -0.5f, -0.5f,
0.5f, -0.5f };
private FloatBuffer mTriangleVertices;
private final String mVertexShader = "attribute vec4 vPosition;\n"
+ "void main() {\n"
+ " gl_Position = vPosition;\n"
+ "}\n";
private final String mFragmentShader = "precision mediump float;\n"
+ "void main() {\n"
+ " gl_FragColor = vec4(0.0, 1.0, 0.0, 1.0);\n"
+ "}\n";
private int mProgram;
private int mvPositionHandle;
}
}
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