ShadowMapping(阴影映射)

package com.bn.Sample4_3_V2; import static com.bn.Sample4_3_V2.Constant.SCREEN_HEIGHT; import static com.bn.Sample4_3_V2.Constant.SCREEN_WIDTH; import static com.bn.Sample4_3_V2.Constant.SHADOW_TEX_HEIGHT; import static com.bn.Sample4_3_V2.Constant.SHADOW_TEX_WIDTH; import android.opengl.GLSurfaceView; import android.opengl.GLES20; import android.view.MotionEvent; import javax.microedition.khronos.egl.EGLConfig; import javax.microedition.khronos.opengles.GL10; import android.content.Context; class MySurfaceView extends GLSurfaceView { private final float TOUCH_SCALE_FACTOR = 180.0f/320;//角度缩放比例 private SceneRenderer mRenderer;//场景渲染器 private float mPreviousY;//上次的触控位置Y坐标 private float mPreviousX;//上次的触控位置X坐标 //摄像机位置相关 float cx=0; float cy=20; float cz=50; float cAngle=0; final float cR=50; //灯光位置 float lx=0; final float ly=10; float lz=45; float lAngle=0; final float lR=45; final float cDis=15; //光源总变换矩阵 float[] mMVPMatrixGY; 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 new Thread() { public void run() { while(true) { lAngle += 0.5;//设置沿x轴旋转角度 lx=(float) Math.sin(Math.toRadians(lAngle))*lR; lz=(float) Math.cos(Math.toRadians(lAngle))*lR; try { Thread.sleep(80); } catch (InterruptedException e) { e.printStackTrace(); } } } }.start(); } //触摸事件回调方法 @Override public boolean onTouchEvent(MotionEvent e) { float y = e.getY(); float x = e.getX(); switch (e.getAction()) { case MotionEvent.ACTION_MOVE: float dy = y - mPreviousY;//计算触控笔Y位移 float dx = x - mPreviousX;//计算触控笔X位移 cAngle += dx * TOUCH_SCALE_FACTOR;//设置沿x轴旋转角度 cx=(float) Math.sin(Math.toRadians(cAngle))*cR; cz=(float) Math.cos(Math.toRadians(cAngle))*cR; cy+= dy/10.0f;//设置沿z轴移动 requestRender();//重绘画面 } mPreviousY = y;//记录触控笔位置 mPreviousX = x;//记录触控笔位置 return true; } private class SceneRenderer implements GLSurfaceView.Renderer { //从指定的obj文件中加载对象 LoadedObjectVertexNormal lovo_pm;//平面 LoadedObjectVertexNormal lovo_ch;//茶壶 LoadedObjectVertexNormal lovo_cft;//长方体 LoadedObjectVertexNormal lovo_qt;//球体 LoadedObjectVertexNormal lovo_yh;//圆环 //TextureRect tr; int frameBufferId; int shadowId;// 动态产生的阴影纹理Id int renderDepthBufferId;// 动态产生的阴影纹理Id boolean isBegin=true; //初始化帧缓冲和渲染缓冲 public void initFRBuffers() { int[] tia=new int[1]; GLES20.glGenFramebuffers(1, tia, 0); frameBufferId=tia[0]; if(isBegin) { GLES20.glGenRenderbuffers(1, tia, 0); renderDepthBufferId=tia[0]; GLES20.glBindRenderbuffer(GLES20.GL_RENDERBUFFER, renderDepthBufferId); GLES20.glRenderbufferStorage(GLES20.GL_RENDERBUFFER, GLES20.GL_DEPTH_COMPONENT16, SHADOW_TEX_WIDTH, SHADOW_TEX_HEIGHT); isBegin=false; } int[] tempIds = new int[1]; GLES20.glGenTextures ( 1, //产生的纹理id的数量 tempIds, //纹理id的数组 0 //偏移量 ); shadowId=tempIds[0]; } //通过绘制产生阴影纹理 public void generateShadowImage() { initFRBuffers(); GLES20.glViewport(0, 0, SHADOW_TEX_WIDTH, SHADOW_TEX_HEIGHT); GLES20.glBindFramebuffer(GLES20.GL_FRAMEBUFFER, frameBufferId); GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, shadowId); GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MIN_FILTER,GLES20.GL_LINEAR); GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D,GLES20.GL_TEXTURE_MAG_FILTER,GLES20.GL_LINEAR); GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_S,GLES20.GL_CLAMP_TO_EDGE); GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_T,GLES20.GL_CLAMP_TO_EDGE); GLES20.glFramebufferTexture2D ( GLES20.GL_FRAMEBUFFER, GLES20.GL_COLOR_ATTACHMENT0, GLES20.GL_TEXTURE_2D, shadowId, 0 ); GLES20.glTexImage2D ( GLES20.GL_TEXTURE_2D, 0, GLES20.GL_RGB, SHADOW_TEX_WIDTH, SHADOW_TEX_HEIGHT, 0, GLES20.GL_RGB, GLES20.GL_UNSIGNED_SHORT_5_6_5, null ); GLES20.glFramebufferRenderbuffer ( GLES20.GL_FRAMEBUFFER, GLES20.GL_DEPTH_ATTACHMENT, GLES20.GL_RENDERBUFFER, renderDepthBufferId ); //清除深度缓冲与颜色缓冲 GLES20.glClear( GLES20.GL_DEPTH_BUFFER_BIT | GLES20.GL_COLOR_BUFFER_BIT); //调用此方法产生摄像机9参数位置矩阵 MatrixState.setCamera(lx,ly,lz,0f,0f,0f,0f,1,0); MatrixState.setProjectFrustum(-1, 1, -1.0f, 1.0f, 1.5f, 400); mMVPMatrixGY=MatrixState.getViewProjMatrix(); //绘制最下面的平面 lovo_pm.drawSelfForShadow(); //绘制球体 MatrixState.pushMatrix(); MatrixState.translate(-cDis, 0, 0); //若加载的物体部位空则绘制物体 lovo_qt.drawSelfForShadow(); MatrixState.popMatrix(); //绘制圆环 MatrixState.pushMatrix(); MatrixState.translate(cDis, 0, 0); MatrixState.rotate(30, 0, 1, 0); //若加载的物体部位空则绘制物体 lovo_yh.drawSelfForShadow(); MatrixState.popMatrix(); //绘制长方体 MatrixState.pushMatrix(); MatrixState.translate(0, 0, -cDis); //若加载的物体部位空则绘制物体 lovo_cft.drawSelfForShadow(); MatrixState.popMatrix(); //绘制茶壶 MatrixState.pushMatrix(); MatrixState.translate(0, 0, cDis); //若加载的物体部位空则绘制物体 lovo_ch.drawSelfForShadow(); MatrixState.popMatrix(); } public void drawScene(GL10 gl) { //设置视窗大小及位置 GLES20.glViewport(0, 0, (int)SCREEN_WIDTH, (int)SCREEN_HEIGHT); GLES20.glBindFramebuffer(GLES20.GL_FRAMEBUFFER, 0); //清除深度缓冲与颜色缓冲 GLES20.glClear( GLES20.GL_DEPTH_BUFFER_BIT | GLES20.GL_COLOR_BUFFER_BIT); GLES20.glClearColor(1f,0.3f,0.3f,1.0f); //调用此方法产生摄像机9参数位置矩阵 //如果要显示距离纹理的话,要改动摄像机位置及观察视角 /