Android OpenGL ES 3.0 纹理应用
本文主要演示OpenGL ES 3.0 纹理演示。接口大部分和2.0没什么区别，脚本稍微有了点变化而已。
扩展GLSurfaceView
package com.example.gles300;
import android.app.ActivityManager;
import android.content.Context;
import android.content.pm.ConfigurationInfo;
import android.opengl.GLSurfaceView;
import android.util.AttributeSet;
import android.util.Log;
/**
*
* @author gaofeng
*
*/
public class MyGLSurfaceView extends GLSurfaceView {
private GLRenderer renderer;
/**
* @param context
*/
public MyGLSurfaceView(Context context) {
super(context);
init();
}
/**
* @param context
* @param attrs
*/
public MyGLSurfaceView(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
private void init() {
ActivityManager am = (ActivityManager) getContext().getSystemService(Context.ACTIVITY_SERVICE);
ConfigurationInfo info = am.getDeviceConfigurationInfo();
String v = info.getGlEsVersion(); //判断是否为3.0 ，一般4.4就开始支持3.0版本了。
if (v.equalsIgnoreCase("3.0")) {
setEGLContextClientVersion(3);
} else {
setEGLContextClientVersion(2);
}
renderer = new GLRenderer();
renderer.setContext(getContext());
setRenderer(renderer);
setRenderMode(RENDERMODE_CONTINUOUSLY);
}
}
package com.example.gles300;
import java.io.IOException;
import java.io.InputStream;
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.GLES30;
import android.opengl.GLSurfaceView.Renderer;
import android.opengl.GLUtils;
import android.opengl.Matrix;
import android.util.Log;
/**
* @author gaofeng
*
*/
public class GLRenderer implements Renderer {
public static float[] projMatrix = new float[16];// 投影
public static float[] viewMatrix = new float[16];// 相机
public static float[] mViewPjMatrix;// 总变换矩阵
public static float[] matrixs = new float[16];
public static int textureId = -1;
Context context;
MyDrawModel drawModel;
public void setContext(Context context) {
this.context = context;
}
public GLRenderer() {
}
@Override
public void onDrawFrame(GL10 arg0) {
GLES30.glClear( GLES30.GL_DEPTH_BUFFER_BIT | GLES30.GL_COLOR_BUFFER_BIT);
Log.e("", "textureId:" + textureId);
drawModel.drawFrame(textureId);
}
@Override
public void onSurfaceChanged(GL10 arg0, int w, int h) {
GLES30.glViewport(0, 0, w, h);
float ratio = (float) w / h;
Matrix.frustumM(projMatrix, 0, -ratio, ratio, -1, 1, 1, 10);//投影矩阵设置
Matrix.setLookAtM(viewMatrix, 0, 0, 0, 3, 0, 0, 0, 0.0f, 1.0f, 0.0f);//摄像机坐标设置
}
@Override
public void onSurfaceCreated(GL10 g, EGLConfig eglConfig) {
GLES30.glClearColor(0.5f,0.5f,0.5f, 1.0f);
GLES30.glEnable(GLES30.GL_DEPTH_TEST);
InputStream ins = null;
drawModel = new MyDrawModel();
drawModel.init();
try {
ins = context.getAssets().open("girl4.jpg");
textureId = createTexture(ins);
Log.e("", "textureId:" + textureId);
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
if (ins != null) {
ins.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
GLES30.glDisable(GLES30.GL_CULL_FACE);
}
public static int createTexture(InputStream ins) {
int[] textures = new int[1];
GLES30.glGenTextures(1, textures, 0);
int textureId = textures[0];
GLES30.glBindTexture(GLES30.GL_TEXTURE_2D, textureId);
GLES30.glTexParameterf(GLES30.GL_TEXTURE_2D, GLES30.GL_TEXTURE_MIN_FILTER,GLES30.GL_NEAREST);
GLES30.glTexParameterf(GLES30.GL_TEXTURE_2D,GLES30.GL_TEXTURE_MAG_FILTER,GLES30.GL_LINEAR);
GLES30.glTexParameterf(GLES30.GL_TEXTURE_2D, GLES30.GL_TEXTURE_WRAP_S,GLES30.GL_CLAMP_TO_EDGE);
GLES30.glTexParameterf(GLES30.GL_TEXTURE_2D, GLES30.GL_TEXTURE_WRAP_T,GLES30.GL_CLAMP_TO_EDGE);
//上面是纹理贴图的取样方式，包括拉伸方式，取临近值和线性值
Bitmap bitmap = BitmapFactory.decodeStream(ins);
GLUtils.texImage2D(GLES30.GL_TEXTURE_2D, 0, bitmap, 0);//让图片和纹理关联起来，加载到OpenGl空间中
Log.d("OPENGL","bitmap:" + bitmap);
bitmap.recycle();//不需要，可以释放
return textureId;
}
}
package com.example.gles300;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.FloatBuffer;
import android.opengl.GLES30;
import android.opengl.Matrix;
import android.util.Log;
/**
* @author gaofeng
*
*/
public class MyDrawModel {
private int programId;
private int mVPMatrixHandle;
private FloatBuffer vertexBuffer;
private FloatBuffer texCoorBuffer;
public MyDrawModel() {
}
public void init() {
initData();
int vertexsharder = GLHelper.compileScript(GLES30.GL_VERTEX_SHADER, GLScript.vertex3);
int fragmentsharder = GLHelper.compileScript(GLES30.GL_FRAGMENT_SHADER, GLScript.fragment3);
programId = GLHelper.linkAttach(vertexsharder, fragmentsharder);
boolean isOK = GLHelper.checkProgram(programId);
mVPMatrixHandle = GLES30.glGetUniformLocation(programId, "uMVPMatrix");
}
private void initData() {
//X,Y,Z 顶点
float vertices[] = new float[] {
0, 0, 0,
-1.8f, -1f, 0,
1.8f, -1f, 0,
1.8f, 1f, 0,
-1.8f, 1f, 0,
-1.8f, -1f, 0
};
ByteBuffer vb = ByteBuffer.allocateDirect(vertices.length * 4);
vb.order(ByteOrder.nativeOrder());
vertexBuffer = vb.asFloatBuffer();
vertexBuffer.put(vertices);
vertexBuffer.position(0);
//纹理空间坐标UV
float texCoor[] = new float[] {
0.5f, 0.5f,
0f, 1f,
1f, 1f,
1f, 0f,
0f, 0f,
0f, 1f
};
ByteBuffer cb = ByteBuffer.allocateDirect(texCoor.length * 4);
cb.order(ByteOrder.nativeOrder());
texCoorBuffer = cb.asFloatBuffer();
texCoorBuffer.put(texCoor);
texCoorBuffer.position(0);
}
public void drawFrame(int textureId) {
GLES30.glUseProgram(programId);
// // 初始化矩阵
Matrix.setRotateM(GLRenderer.matrixs, 0, 0, 1, 0, 0);
Matrix.translateM(GLRenderer.matrixs, 0, 0, 0, 1);
//矩阵转换 ,投影矩阵，摄像机矩阵，模型矩阵
GLRenderer.mViewPjMatrix = new float[16];
Matrix.multiplyMM(GLRenderer.mViewPjMatrix, 0, GLRenderer.viewMatrix,0, GLRenderer.matrixs, 0);
Matrix.multiplyMM(GLRenderer.mViewPjMatrix, 0, GLRenderer.projMatrix,0, GLRenderer.mViewPjMatrix, 0);
GLES30.glUniformMatrix4fv(mVPMatrixHandle, 1, false, GLRenderer.mViewPjMatrix, 0);
GLES30.glVertexAttribPointer(0, 3, GLES30.GL_FLOAT, false, 3 * 4, vertexBuffer);
GLES30.glVertexAttribPointer(1, 2, GLES30.GL_FLOAT, false, 2 * 4, texCoorBuffer);
GLES30.glEnableVertexAttribArray(0);
GLES30.glEnableVertexAttribArray(1);
GLES30.glActiveTexture(GLES30.GL_TEXTURE0);
GLES30.glBindTexture(GLES30.GL_TEXTURE_2D, textureId);
GLES30.glDrawArrays(GLES30.GL_TRIANGLE_FAN, 0, 6);//六个定点，绘制三角形
}
}
package com.example.gles300;
/**
* @author gaofeng
*
*/
public class GLScript {
public GLScript() {
}
public static final String vertex3 =
"#version 300 es \n" +
"uniform mat4 uMVPMatrix;\n"
+ "layout(location = 0) in vec3 aPosition;\n"
+ "layout(location = 1) in vec2 aTexCoor;\n"
+ "out vec2 vTextureCoord;\n"
+ "void main() { \n"
+ "gl_Position = uMVPMatrix * vec4(aPosition,1);\n"
+ "vTextureCoord = aTexCoor;\n"
+ "}\n"
;
public static final String fragment3 = "#version 300 es \n" +
"precision mediump float;\n"
+ "in vec2 vTextureCoord;\n"
+ "uniform sampler2D sTexture;\n"
+ "out vec4 v_color;\n"
+ "void main() { \n"
+ "vec2 coord = vTextureCoord;\n"
+ "coord.s = coord.s * 0.5;\n"
+ "v_color = texture(sTexture, coord); \n"
+ "}\n"
;
}
layout(location=0) in vec3 aPosition;定义个输入，location定义了这个数据的位置，相对于2.0 不需要进行attribute查找。
3.0中内置变量gl_FragColor 也被 out 颜色输出修改了。
3.0脚本前面需要添加 #version 300 es 版本声明
最后是脚本编译和链接工具类.
package com.example.gles300;
import android.opengl.GLES30;
import android.util.Log;
/**
* @author gaofeng
*
*/
public class GLHelper {
/**
*
*/
public GLHelper() {
// TODO Auto-generated constructor stub
}
public static int linkGL(){
int programId = GLES30.glCreateProgram();//创建一个程序
if (programId == 0) {
Log.e("OPENGL", "Error Create Link Program");
return 0;
}
return programId;
}
public static int linkAttach(int vertexsharder,int fragmentsharder){
int programId = linkGL();
GLES30.glAttachShader(programId, vertexsharder); //和着色器进行关联
GLES30.glAttachShader(programId, fragmentsharder);//和着色器进行关联
GLES30.glLinkProgram(programId); //把program链接起来
int status[] = new int[1];
GLES30.glGetProgramiv(programId, GLES30.GL_LINK_STATUS, status, 0); //这地方一样是检查是否有错误发生。
Log.d("OPENGL","linkAttach link status is " + GLES30.glGetProgramInfoLog(programId));
if (status[0] == 0) {
Log.e("OPENGL","link status is error.");
GLES30.glDeleteProgram(programId);
return 0;
}
return programId;
}
public static boolean checkProgram(int programId){
GLES30.glValidateProgram(programId);
int status[] = new int[1];
GLES30.glGetProgramiv(programId,GLES30.GL_VALIDATE_STATUS, status,0);
if (status[0] == 0) {
Log.e("OPENGL","program is error");
return false;
}
return true;
}
public static int compileScript(int type, String script){
int objID = GLES30.glCreateShader(type); //创建一个着色器对象,TYPE表示顶点着色器和片段着色器
if (objID == 0) { //0表示有错误
return 0;
}
GLES30.glShaderSource(objID, script); //把脚本代码传给OpenGL 引擎
GLES30.glCompileShader(objID); //开始编译
int[] status = new int[1];
GLES30.glGetShaderiv(objID, GLES30.GL_COMPILE_STATUS, status, 0); //看看编译结果是否有错误。
Log.d("OPENGL","compileScript status info:" + GLES30.glGetShaderInfoLog(objID));
if (status[0] == 0) {
GLES30.glDeleteShader(objID);//有错误我们删除这个对象。
Log.e("OPENGL", "Error Compile Script:" + script);
return 0;
}
return objID;
}
}
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