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xiaoyan
2022-09-19 18:05:01 +08:00
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第5章 投影及各种变换/Sample5_3/.classpath Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<classpath>
<classpathentry kind="src" path="src"/>
<classpathentry kind="src" path="gen"/>
<classpathentry kind="con" path="com.android.ide.eclipse.adt.ANDROID_FRAMEWORK"/>
<classpathentry kind="output" path="bin"/>
</classpath>

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<?xml version="1.0" encoding="UTF-8"?>
<projectDescription>
<name>Sample5_4</name>
<comment></comment>
<projects>
</projects>
<buildSpec>
<buildCommand>
<name>com.android.ide.eclipse.adt.ResourceManagerBuilder</name>
<arguments>
</arguments>
</buildCommand>
<buildCommand>
<name>com.android.ide.eclipse.adt.PreCompilerBuilder</name>
<arguments>
</arguments>
</buildCommand>
<buildCommand>
<name>org.eclipse.jdt.core.javabuilder</name>
<arguments>
</arguments>
</buildCommand>
<buildCommand>
<name>com.android.ide.eclipse.adt.ApkBuilder</name>
<arguments>
</arguments>
</buildCommand>
</buildSpec>
<natures>
<nature>com.android.ide.eclipse.adt.AndroidNature</nature>
<nature>org.eclipse.jdt.core.javanature</nature>
</natures>
</projectDescription>

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第5章 投影及各种变换/Sample5_3/.settings/org.eclipse.jdt.core.prefs Normal file
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#Wed Jan 05 21:56:15 CST 2011
eclipse.preferences.version=1
org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled
org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.6
org.eclipse.jdt.core.compiler.codegen.unusedLocal=preserve
org.eclipse.jdt.core.compiler.compliance=1.6
org.eclipse.jdt.core.compiler.debug.lineNumber=generate
org.eclipse.jdt.core.compiler.debug.localVariable=generate
org.eclipse.jdt.core.compiler.debug.sourceFile=generate
org.eclipse.jdt.core.compiler.problem.assertIdentifier=error
org.eclipse.jdt.core.compiler.problem.enumIdentifier=error
org.eclipse.jdt.core.compiler.source=1.6

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<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
android:versionCode="1"
android:versionName="1.0" package="com.bn.Sample5_3">
<application android:icon="@drawable/icon" android:label="@string/app_name">
<activity android:name=".Sample5_3_Activity"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
<uses-sdk android:targetSdkVersion="8"></uses-sdk>
</manifest>

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第5章 投影及各种变换/Sample5_3/assets/frag.sh Normal file
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precision mediump float;
varying vec4 vColor; //接收从顶点着色器过来的参数
varying vec3 vPosition;//接收从顶点着色器过来的顶点位置
void main() {
gl_FragColor = vColor;//给此片元颜色值
}

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第5章 投影及各种变换/Sample5_3/assets/vertex.sh Normal file
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uniform mat4 uMVPMatrix; //总变换矩阵
attribute vec3 aPosition; //顶点位置
attribute vec4 aColor; //顶点颜色
varying vec4 vColor; //用于传递给片元着色器的变量
void main() {
gl_Position = uMVPMatrix * vec4(aPosition,1); //根据总变换矩阵计算此次绘制此顶点位置
vColor = aColor;//将接收的颜色传递给片元着色器
}

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第5章 投影及各种变换/Sample5_3/default.properties Normal file
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# This file is automatically generated by Android Tools.
# Do not modify this file -- YOUR CHANGES WILL BE ERASED!
#
# This file must be checked in Version Control Systems.
#
# To customize properties used by the Ant build system use,
# "build.properties", and override values to adapt the script to your
# project structure.
# Indicates whether an apk should be generated for each density.
split.density=false
# Project target.
target=android-8

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第5章 投影及各种变换/Sample5_3/gen/com/bn/Sample5_3/R.java Normal file
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/* AUTO-GENERATED FILE. DO NOT MODIFY.
*
* This class was automatically generated by the
* aapt tool from the resource data it found. It
* should not be modified by hand.
*/
package com.bn.Sample5_3;
public final class R {
public static final class attr {
}
public static final class drawable {
public static final int icon=0x7f020000;
}
public static final class id {
public static final int main_liner=0x7f050000;
}
public static final class layout {
public static final int main=0x7f030000;
}
public static final class string {
public static final int app_name=0x7f040000;
}
}

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第5章 投影及各种变换/Sample5_3/res/layout/main.xml Normal file
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<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="@+id/main_liner"
>
</LinearLayout>

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第5章 投影及各种变换/Sample5_3/res/values/strings.xml Normal file
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<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="app_name">Sample5_3</string>
</resources>

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第5章 投影及各种变换/Sample5_3/src/com/bn/Sample5_3/Constant.java Normal file
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package com.bn.Sample5_3;
public class Constant
{
//单位尺寸
public static final float UNIT_SIZE=1f;
//计算GLSurfaceView的宽高比
public static float ratio;
}

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第5章 投影及各种变换/Sample5_3/src/com/bn/Sample5_3/Cube.java Normal file
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package com.bn.Sample5_3;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.FloatBuffer;
import android.opengl.GLES20;
//颜色立方体
public class Cube
{
int mProgram;//自定义渲染管线着色器程序id
int muMVPMatrixHandle;//总变换矩阵引用
int maPositionHandle; //顶点位置属性引用
int maColorHandle; //顶点颜色属性引用
String mVertexShader;//顶点着色器代码脚本
String mFragmentShader;//片元着色器代码脚本
FloatBuffer mVertexBuffer;//顶点坐标数据缓冲
FloatBuffer mColorBuffer;//顶点着色数据缓冲
int vCount=0;
public Cube(MySurfaceView mv)
{
//初始化顶点坐标与着色数据
initVertexData();
//初始化shader
initShader(mv);
}
//初始化顶点坐标与着色数据的方法
public void initVertexData()
{
//顶点坐标数据的初始化================begin============================
vCount=12*6;
float vertices[]=new float[]
{
//前面
0,0,Constant.UNIT_SIZE,
Constant.UNIT_SIZE,Constant.UNIT_SIZE,Constant.UNIT_SIZE,
-Constant.UNIT_SIZE,Constant.UNIT_SIZE,Constant.UNIT_SIZE,
0,0,Constant.UNIT_SIZE,
-Constant.UNIT_SIZE,Constant.UNIT_SIZE,Constant.UNIT_SIZE,
-Constant.UNIT_SIZE,-Constant.UNIT_SIZE,Constant.UNIT_SIZE,
0,0,Constant.UNIT_SIZE,
-Constant.UNIT_SIZE,-Constant.UNIT_SIZE,Constant.UNIT_SIZE,
Constant.UNIT_SIZE,-Constant.UNIT_SIZE,Constant.UNIT_SIZE,
0,0,Constant.UNIT_SIZE,
Constant.UNIT_SIZE,-Constant.UNIT_SIZE,Constant.UNIT_SIZE,
Constant.UNIT_SIZE,Constant.UNIT_SIZE,Constant.UNIT_SIZE,
//后面
0,0,-Constant.UNIT_SIZE,
Constant.UNIT_SIZE,Constant.UNIT_SIZE,-Constant.UNIT_SIZE,
Constant.UNIT_SIZE,-Constant.UNIT_SIZE,-Constant.UNIT_SIZE,
0,0,-Constant.UNIT_SIZE,
Constant.UNIT_SIZE,-Constant.UNIT_SIZE,-Constant.UNIT_SIZE,
-Constant.UNIT_SIZE,-Constant.UNIT_SIZE,-Constant.UNIT_SIZE,
0,0,-Constant.UNIT_SIZE,
-Constant.UNIT_SIZE,-Constant.UNIT_SIZE,-Constant.UNIT_SIZE,
-Constant.UNIT_SIZE,Constant.UNIT_SIZE,-Constant.UNIT_SIZE,
0,0,-Constant.UNIT_SIZE,
-Constant.UNIT_SIZE,Constant.UNIT_SIZE,-Constant.UNIT_SIZE,
Constant.UNIT_SIZE,Constant.UNIT_SIZE,-Constant.UNIT_SIZE,
//左面
-Constant.UNIT_SIZE,0,0,
-Constant.UNIT_SIZE,Constant.UNIT_SIZE,Constant.UNIT_SIZE,
-Constant.UNIT_SIZE,Constant.UNIT_SIZE,-Constant.UNIT_SIZE,
-Constant.UNIT_SIZE,0,0,
-Constant.UNIT_SIZE,Constant.UNIT_SIZE,-Constant.UNIT_SIZE,
-Constant.UNIT_SIZE,-Constant.UNIT_SIZE,-Constant.UNIT_SIZE,
-Constant.UNIT_SIZE,0,0,
-Constant.UNIT_SIZE,-Constant.UNIT_SIZE,-Constant.UNIT_SIZE,
-Constant.UNIT_SIZE,-Constant.UNIT_SIZE,Constant.UNIT_SIZE,
-Constant.UNIT_SIZE,0,0,
-Constant.UNIT_SIZE,-Constant.UNIT_SIZE,Constant.UNIT_SIZE,
-Constant.UNIT_SIZE,Constant.UNIT_SIZE,Constant.UNIT_SIZE,
//右面
Constant.UNIT_SIZE,0,0,
Constant.UNIT_SIZE,Constant.UNIT_SIZE,Constant.UNIT_SIZE,
Constant.UNIT_SIZE,-Constant.UNIT_SIZE,Constant.UNIT_SIZE,
Constant.UNIT_SIZE,0,0,
Constant.UNIT_SIZE,-Constant.UNIT_SIZE,Constant.UNIT_SIZE,
Constant.UNIT_SIZE,-Constant.UNIT_SIZE,-Constant.UNIT_SIZE,
Constant.UNIT_SIZE,0,0,
Constant.UNIT_SIZE,-Constant.UNIT_SIZE,-Constant.UNIT_SIZE,
Constant.UNIT_SIZE,Constant.UNIT_SIZE,-Constant.UNIT_SIZE,
Constant.UNIT_SIZE,0,0,
Constant.UNIT_SIZE,Constant.UNIT_SIZE,-Constant.UNIT_SIZE,
Constant.UNIT_SIZE,Constant.UNIT_SIZE,Constant.UNIT_SIZE,
//上面
0,Constant.UNIT_SIZE,0,
Constant.UNIT_SIZE,Constant.UNIT_SIZE,Constant.UNIT_SIZE,
Constant.UNIT_SIZE,Constant.UNIT_SIZE,-Constant.UNIT_SIZE,
0,Constant.UNIT_SIZE,0,
Constant.UNIT_SIZE,Constant.UNIT_SIZE,-Constant.UNIT_SIZE,
-Constant.UNIT_SIZE,Constant.UNIT_SIZE,-Constant.UNIT_SIZE,
0,Constant.UNIT_SIZE,0,
-Constant.UNIT_SIZE,Constant.UNIT_SIZE,-Constant.UNIT_SIZE,
-Constant.UNIT_SIZE,Constant.UNIT_SIZE,Constant.UNIT_SIZE,
0,Constant.UNIT_SIZE,0,
-Constant.UNIT_SIZE,Constant.UNIT_SIZE,Constant.UNIT_SIZE,
Constant.UNIT_SIZE,Constant.UNIT_SIZE,Constant.UNIT_SIZE,
//下面
0,-Constant.UNIT_SIZE,0,
Constant.UNIT_SIZE,-Constant.UNIT_SIZE,Constant.UNIT_SIZE,
-Constant.UNIT_SIZE,-Constant.UNIT_SIZE,Constant.UNIT_SIZE,
0,-Constant.UNIT_SIZE,0,
-Constant.UNIT_SIZE,-Constant.UNIT_SIZE,Constant.UNIT_SIZE,
-Constant.UNIT_SIZE,-Constant.UNIT_SIZE,-Constant.UNIT_SIZE,
0,-Constant.UNIT_SIZE,0,
-Constant.UNIT_SIZE,-Constant.UNIT_SIZE,-Constant.UNIT_SIZE,
Constant.UNIT_SIZE,-Constant.UNIT_SIZE,-Constant.UNIT_SIZE,
0,-Constant.UNIT_SIZE,0,
Constant.UNIT_SIZE,-Constant.UNIT_SIZE,-Constant.UNIT_SIZE,
Constant.UNIT_SIZE,-Constant.UNIT_SIZE,Constant.UNIT_SIZE,
};
//创建顶点坐标数据缓冲
//vertices.length*4是因为一个整数四个字节
ByteBuffer vbb = ByteBuffer.allocateDirect(vertices.length*4);
vbb.order(ByteOrder.nativeOrder());//设置字节顺序
mVertexBuffer = vbb.asFloatBuffer();//转换为Float型缓冲
mVertexBuffer.put(vertices);//向缓冲区中放入顶点坐标数据
mVertexBuffer.position(0);//设置缓冲区起始位置
//特别提示：由于不同平台字节顺序不同数据单元不是字节的一定要经过ByteBuffer
//转换，关键是要通过ByteOrder设置nativeOrder()，否则有可能会出问题
//顶点坐标数据的初始化================end============================
//顶点颜色值数组，每个顶点4个色彩值RGBA
float colors[]=new float[]{
//前面
1,1,1,0,//中间为白色
1,0,0,0,
1,0,0,0,
1,1,1,0,//中间为白色
1,0,0,0,
1,0,0,0,
1,1,1,0,//中间为白色
1,0,0,0,
1,0,0,0,
1,1,1,0,//中间为白色
1,0,0,0,
1,0,0,0,
//后面
1,1,1,0,//中间为白色
0,0,1,0,
0,0,1,0,
1,1,1,0,//中间为白色
0,0,1,0,
0,0,1,0,
1,1,1,0,//中间为白色
0,0,1,0,
0,0,1,0,
1,1,1,0,//中间为白色
0,0,1,0,
0,0,1,0,
//左面
1,1,1,0,//中间为白色
1,0,1,0,
1,0,1,0,
1,1,1,0,//中间为白色
1,0,1,0,
1,0,1,0,
1,1,1,0,//中间为白色
1,0,1,0,
1,0,1,0,
1,1,1,0,//中间为白色
1,0,1,0,
1,0,1,0,
//右面
1,1,1,0,//中间为白色
1,1,0,0,
1,1,0,0,
1,1,1,0,//中间为白色
1,1,0,0,
1,1,0,0,
1,1,1,0,//中间为白色
1,1,0,0,
1,1,0,0,
1,1,1,0,//中间为白色
1,1,0,0,
1,1,0,0,
//上面
1,1,1,0,//中间为白色
0,1,0,0,
0,1,0,0,
1,1,1,0,//中间为白色
0,1,0,0,
0,1,0,0,
1,1,1,0,//中间为白色
0,1,0,0,
0,1,0,0,
1,1,1,0,//中间为白色
0,1,0,0,
0,1,0,0,
//下面
1,1,1,0,//中间为白色
0,1,1,0,
0,1,1,0,
1,1,1,0,//中间为白色
0,1,1,0,
0,1,1,0,
1,1,1,0,//中间为白色
0,1,1,0,
0,1,1,0,
1,1,1,0,//中间为白色
0,1,1,0,
0,1,1,0,
};
//创建顶点着色数据缓冲
ByteBuffer cbb = ByteBuffer.allocateDirect(colors.length*4);
cbb.order(ByteOrder.nativeOrder());//设置字节顺序
mColorBuffer = cbb.asFloatBuffer();//转换为Float型缓冲
mColorBuffer.put(colors);//向缓冲区中放入顶点着色数据
mColorBuffer.position(0);//设置缓冲区起始位置
//特别提示：由于不同平台字节顺序不同数据单元不是字节的一定要经过ByteBuffer
//转换，关键是要通过ByteOrder设置nativeOrder()，否则有可能会出问题
//顶点着色数据的初始化================end============================
}
//初始化shader
public void initShader(MySurfaceView mv)
{
//加载顶点着色器的脚本内容
mVertexShader=ShaderUtil.loadFromAssetsFile("vertex.sh", mv.getResources());
//加载片元着色器的脚本内容
mFragmentShader=ShaderUtil.loadFromAssetsFile("frag.sh", mv.getResources());
//基于顶点着色器与片元着色器创建程序
mProgram = ShaderUtil.createProgram(mVertexShader, mFragmentShader);
//获取程序中顶点位置属性引用id
maPositionHandle = GLES20.glGetAttribLocation(mProgram, "aPosition");
//获取程序中顶点颜色属性引用id
maColorHandle= GLES20.glGetAttribLocation(mProgram, "aColor");
//获取程序中总变换矩阵引用id
muMVPMatrixHandle = GLES20.glGetUniformLocation(mProgram, "uMVPMatrix");
}
public void drawSelf()
{
//制定使用某套shader程序
GLES20.glUseProgram(mProgram);
//将最终变换矩阵传入shader程序
GLES20.glUniformMatrix4fv(muMVPMatrixHandle, 1, false, MatrixState.getFinalMatrix(), 0);
//为画笔指定顶点位置数据
GLES20.glVertexAttribPointer
(
maPositionHandle,
3,
GLES20.GL_FLOAT,
false,
3*4,
mVertexBuffer
);
//为画笔指定顶点着色数据
GLES20.glVertexAttribPointer
(
maColorHandle,
4,
GLES20.GL_FLOAT,
false,
4*4,
mColorBuffer
);
//允许顶点位置数据数组
GLES20.glEnableVertexAttribArray(maPositionHandle);
GLES20.glEnableVertexAttribArray(maColorHandle);
//绘制立方体
GLES20.glDrawArrays(GLES20.GL_TRIANGLES,0, vCount);
}
}

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第5章 投影及各种变换/Sample5_3/src/com/bn/Sample5_3/MatrixState.java Normal file
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package com.bn.Sample5_3;
import java.nio.ByteBuffer;
import android.opengl.Matrix;
//存储系统矩阵状态的类
public class MatrixState
{
private static float[] mProjMatrix = new float[16];//4x4矩阵 投影用
private static float[] mVMatrix = new float[16];//摄像机位置朝向9参数矩阵
private static float[] currMatrix;//当前变换矩阵
//保护变换矩阵的栈
static float[][] mStack=new float[10][16];
static int stackTop=-1;
public static void setInitStack()//获取不变换初始矩阵
{
currMatrix=new float[16];
Matrix.setRotateM(currMatrix, 0, 0, 1, 0, 0);
}
public static void pushMatrix()//保护变换矩阵
{
stackTop++;
for(int i=0;i<16;i++)
{
mStack[stackTop][i]=currMatrix[i];
}
}
public static void popMatrix()//恢复变换矩阵
{
for(int i=0;i<16;i++)
{
currMatrix[i]=mStack[stackTop][i];
}
stackTop--;
}
public static void translate(float x,float y,float z)//设置沿xyz轴移动
{
Matrix.translateM(currMatrix, 0, x, y, z);
}
//设置摄像机
static ByteBuffer llbb= ByteBuffer.allocateDirect(3*4);
static float[] cameraLocation=new float[3];//摄像机位置
public static void setCamera
(
float cx, //摄像机位置x
float cy, //摄像机位置y
float cz, //摄像机位置z
float tx, //摄像机目标点x
float ty, //摄像机目标点y
float tz, //摄像机目标点z
float upx, //摄像机UP向量X分量
float upy, //摄像机UP向量Y分量
float upz //摄像机UP向量Z分量
)
{
Matrix.setLookAtM
(
mVMatrix,
0,
cx,
cy,
cz,
tx,
ty,
tz,
upx,
upy,
upz
);
}
//设置透视投影参数
public static void setProjectFrustum
(
float left, //near面的left
float right, //near面的right
float bottom, //near面的bottom
float top, //near面的top
float near, //near面距离
float far //far面距离
)
{
Matrix.frustumM(mProjMatrix, 0, left, right, bottom, top, near, far);
}
//设置正交投影参数
public static void setProjectOrtho
(
float left, //near面的left
float right, //near面的right
float bottom, //near面的bottom
float top, //near面的top
float near, //near面距离
float far //far面距离
)
{
Matrix.orthoM(mProjMatrix, 0, left, right, bottom, top, near, far);
}
//获取具体物体的总变换矩阵
static float[] mMVPMatrix=new float[16];
public static float[] getFinalMatrix()
{
Matrix.multiplyMM(mMVPMatrix, 0, mVMatrix, 0, currMatrix, 0);
Matrix.multiplyMM(mMVPMatrix, 0, mProjMatrix, 0, mMVPMatrix, 0);
return mMVPMatrix;
}
//获取具体物体的变换矩阵
public static float[] getMMatrix()
{
return currMatrix;
}
}

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第5章 投影及各种变换/Sample5_3/src/com/bn/Sample5_3/MySurfaceView.java Normal file
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package com.bn.Sample5_3;
import javax.microedition.khronos.egl.EGLConfig;
import javax.microedition.khronos.opengles.GL10;
import android.content.Context;
import android.opengl.GLES20;
import android.opengl.GLSurfaceView;
class MySurfaceView extends GLSurfaceView
{
private SceneRenderer mRenderer;//场景渲染器
public MySurfaceView(Context context) {
super(context);
this.setEGLContextClientVersion(2); //设置使用OPENGL ES2.0
mRenderer = new SceneRenderer(); //创建场景渲染器
setRenderer(mRenderer); //设置渲染器
setRenderMode(GLSurfaceView.RENDERMODE_CONTINUOUSLY);//设置渲染模式为主动渲染
}
private class SceneRenderer implements GLSurfaceView.Renderer
{
Cube cube;//立方体
public void onDrawFrame(GL10 gl)
{
//清除深度缓冲与颜色缓冲
GLES20.glClear( GLES20.GL_DEPTH_BUFFER_BIT | GLES20.GL_COLOR_BUFFER_BIT);
//绘制原立方体
MatrixState.pushMatrix();
cube.drawSelf();
MatrixState.popMatrix();
//绘制变换后的立方体
MatrixState.pushMatrix();
MatrixState.translate(4, 0, 0);//沿x方向平移3
cube.drawSelf();
MatrixState.popMatrix();
}
public void onSurfaceChanged(GL10 gl, int width, int height) {
//设置视窗大小及位置
GLES20.glViewport(0, 0, width, height);
//计算GLSurfaceView的宽高比
Constant.ratio = (float) width / height;
// 调用此方法计算产生透视投影矩阵
MatrixState.setProjectFrustum(-Constant.ratio*0.8f, Constant.ratio*1.2f, -1, 1, 20, 100);
// 调用此方法产生摄像机9参数位置矩阵
MatrixState.setCamera(-16f, 8f, 45, 0f, 0f, 0f, 0f, 1.0f, 0.0f);
//初始化变换矩阵
MatrixState.setInitStack();
}
public void onSurfaceCreated(GL10 gl, EGLConfig config) {
//设置屏幕背景色RGBA
GLES20.glClearColor(0.5f,0.5f,0.5f, 1.0f);
//创建立方体对象
cube=new Cube(MySurfaceView.this);
//打开深度检测
GLES20.glEnable(GLES20.GL_DEPTH_TEST);
//打开背面剪裁
GLES20.glEnable(GLES20.GL_CULL_FACE);
}
}
}

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第5章 投影及各种变换/Sample5_3/src/com/bn/Sample5_3/Sample5_3_Activity.java Normal file
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package com.bn.Sample5_3;
import android.app.Activity;
import android.content.pm.ActivityInfo;
import android.os.Bundle;
import android.view.Window;
import android.view.WindowManager;
public class Sample5_3_Activity extends Activity {
private MySurfaceView mGLSurfaceView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// 设置为全屏
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
// 设置为横屏模式
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
// 初始化GLSurfaceView
mGLSurfaceView = new MySurfaceView(this);
// 切换到主界面
setContentView(mGLSurfaceView);
mGLSurfaceView.requestFocus();// 获取焦点
mGLSurfaceView.setFocusableInTouchMode(true);// 设置为可触控
}
@Override
protected void onResume() {
super.onResume();
mGLSurfaceView.onResume();
}
@Override
protected void onPause() {
super.onPause();
mGLSurfaceView.onPause();
}
}

126
第5章 投影及各种变换/Sample5_3/src/com/bn/Sample5_3/ShaderUtil.java Normal file
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package com.bn.Sample5_3;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import android.content.res.Resources;
import android.opengl.GLES20;
import android.util.Log;
//加载顶点Shader与片元Shader的工具类
public class ShaderUtil
{
//加载制定shader的方法
public static int loadShader
(
int shaderType, //shader的类型 GLES20.GL_VERTEX_SHADER GLES20.GL_FRAGMENT_SHADER
String source //shader的脚本字符串
)
{
//创建一个新shader
int shader = GLES20.glCreateShader(shaderType);
//若创建成功则加载shader
if (shader != 0)
{
//加载shader的源代码
GLES20.glShaderSource(shader, source);
//编译shader
GLES20.glCompileShader(shader);
//存放编译成功shader数量的数组
int[] compiled = new int[1];
//获取Shader的编译情况
GLES20.glGetShaderiv(shader, GLES20.GL_COMPILE_STATUS, compiled, 0);
if (compiled[0] == 0)
{//若编译失败则显示错误日志并删除此shader
Log.e("ES20_ERROR", "Could not compile shader " + shaderType + ":");
Log.e("ES20_ERROR", GLES20.glGetShaderInfoLog(shader));
GLES20.glDeleteShader(shader);
shader = 0;
}
}
return shader;
}
//创建shader程序的方法
public static int createProgram(String vertexSource, String fragmentSource)
{
//加载顶点着色器
int vertexShader = loadShader(GLES20.GL_VERTEX_SHADER, vertexSource);
if (vertexShader == 0)
{
return 0;
}
//加载片元着色器
int pixelShader = loadShader(GLES20.GL_FRAGMENT_SHADER, fragmentSource);
if (pixelShader == 0)
{
return 0;
}
//创建程序
int program = GLES20.glCreateProgram();
//若程序创建成功则向程序中加入顶点着色器与片元着色器
if (program != 0)
{
//向程序中加入顶点着色器
GLES20.glAttachShader(program, vertexShader);
checkGlError("glAttachShader");
//向程序中加入片元着色器
GLES20.glAttachShader(program, pixelShader);
checkGlError("glAttachShader");
//链接程序
GLES20.glLinkProgram(program);
//存放链接成功program数量的数组
int[] linkStatus = new int[1];
//获取program的链接情况
GLES20.glGetProgramiv(program, GLES20.GL_LINK_STATUS, linkStatus, 0);
//若链接失败则报错并删除程序
if (linkStatus[0] != GLES20.GL_TRUE)
{
Log.e("ES20_ERROR", "Could not link program: ");
Log.e("ES20_ERROR", GLES20.glGetProgramInfoLog(program));
GLES20.glDeleteProgram(program);
program = 0;
}
}
return program;
}
//检查每一步操作是否有错误的方法
public static void checkGlError(String op)
{
int error;
while ((error = GLES20.glGetError()) != GLES20.GL_NO_ERROR)
{
Log.e("ES20_ERROR", op + ": glError " + error);
throw new RuntimeException(op + ": glError " + error);
}
}
//从sh脚本中加载shader内容的方法
public static String loadFromAssetsFile(String fname,Resources r)
{
String result=null;
try
{
InputStream in=r.getAssets().open(fname);
int ch=0;
ByteArrayOutputStream baos = new ByteArrayOutputStream();
while((ch=in.read())!=-1)
{
baos.write(ch);
}
byte[] buff=baos.toByteArray();
baos.close();
in.close();
result=new String(buff,"UTF-8");
result=result.replaceAll("\\r\\n","\n");
}
catch(Exception e)
{
e.printStackTrace();
}
return result;
}
}