这是绝对有可能的。看看AndEngineExamples项目中的着色器示例。你基本上必须渲染场景到一个（空）纹理，然后使用着色器。
RadialBlur实施例：
package org.andengine.examples;
import org.andengine.engine.Engine;
import org.andengine.engine.camera.Camera;
import org.andengine.engine.options.EngineOptions;
import org.andengine.engine.options.ScreenOrientation;
import org.andengine.engine.options.resolutionpolicy.RatioResolutionPolicy;
import org.andengine.entity.scene.IOnSceneTouchListener;
import org.andengine.entity.scene.Scene;
import org.andengine.entity.sprite.Sprite;
import org.andengine.entity.sprite.UncoloredSprite;
import org.andengine.entity.util.FPSLogger;
import org.andengine.input.touch.TouchEvent;
import org.andengine.input.touch.detector.ClickDetector;
import org.andengine.input.touch.detector.ClickDetector.IClickDetectorListener;
import org.andengine.opengl.shader.PositionTextureCoordinatesShaderProgram;
import org.andengine.opengl.shader.ShaderProgram;
import org.andengine.opengl.shader.constants.ShaderProgramConstants;
import org.andengine.opengl.shader.exception.ShaderProgramException;
import org.andengine.opengl.shader.exception.ShaderProgramLinkException;
import org.andengine.opengl.texture.atlas.bitmap.BitmapTextureAtlas;
import org.andengine.opengl.texture.atlas.bitmap.BitmapTextureAtlasTextureRegionFactory;
import org.andengine.opengl.texture.region.ITextureRegion;
import org.andengine.opengl.texture.region.TextureRegionFactory;
import org.andengine.opengl.texture.render.RenderTexture;
import org.andengine.opengl.util.GLState;
import org.andengine.opengl.vbo.attribute.VertexBufferObjectAttributes;
import org.andengine.ui.activity.SimpleBaseGameActivity;
import android.opengl.GLES20;
/**
* (c) Zynga 2011
*
* @author Nicolas Gramlich <[email protected]>
* @since 16:55:18 - 06.11.2011
*/
public class RadialBlurExample extends SimpleBaseGameActivity implements IOnSceneTouchListener, IClickDetectorListener {
// ===========================================================
// Constants
// ===========================================================
private static final int CAMERA_WIDTH = 720;
private static final int CAMERA_HEIGHT = 480;
// ===========================================================
// Fields
// ===========================================================
private Camera mCamera;
private BitmapTextureAtlas mBitmapTextureAtlas;
private ITextureRegion mFaceTextureRegion;
private boolean mRadialBlurring = true;
private float mRadialBlurCenterX = 0.5f;
private float mRadialBlurCenterY = 0.5f;
private ClickDetector mClickDetector;
// ===========================================================
// Constructors
// ===========================================================
// ===========================================================
// Getter & Setter
// ===========================================================
// ===========================================================
// Methods for/from SuperClass/Interfaces
// ===========================================================
@Override
public EngineOptions onCreateEngineOptions() {
this.mCamera = new Camera(0, 0, RadialBlurExample.CAMERA_WIDTH, RadialBlurExample.CAMERA_HEIGHT);
return new EngineOptions(true, ScreenOrientation.LANDSCAPE_FIXED, new RatioResolutionPolicy(RadialBlurExample.CAMERA_WIDTH, RadialBlurExample.CAMERA_HEIGHT), this.mCamera);
}
@Override
public Engine onCreateEngine(EngineOptions pEngineOptions) {
return new Engine(pEngineOptions) {
private boolean mRenderTextureInitialized;
private RenderTexture mRenderTexture;
private UncoloredSprite mRenderTextureSprite;
@Override
public void onDrawFrame(final GLState pGLState) throws InterruptedException {
final boolean firstFrame = !this.mRenderTextureInitialized;
if(firstFrame) {
this.initRenderTextures(pGLState);
this.mRenderTextureInitialized = true;
}
final int surfaceWidth = this.mCamera.getSurfaceWidth();
final int surfaceHeight = this.mCamera.getSurfaceHeight();
this.mRenderTexture.begin(pGLState);
{
/* Draw current frame. */
super.onDrawFrame(pGLState);
}
this.mRenderTexture.end(pGLState);
/* Draw rendered texture with custom shader. */
{
pGLState.pushProjectionGLMatrix();
pGLState.orthoProjectionGLMatrixf(0, surfaceWidth, 0, surfaceHeight, -1, 1);
{
this.mRenderTextureSprite.onDraw(pGLState, this.mCamera);
}
pGLState.popProjectionGLMatrix();
}
}
private void initRenderTextures(final GLState pGLState) {
final int surfaceWidth = this.mCamera.getSurfaceWidth();
final int surfaceHeight = this.mCamera.getSurfaceHeight();
this.mRenderTexture = new RenderTexture(RadialBlurExample.this.getTextureManager(), surfaceWidth, surfaceHeight);
this.mRenderTexture.init(pGLState);
final ITextureRegion renderTextureTextureRegion = TextureRegionFactory.extractFromTexture(this.mRenderTexture);
this.mRenderTextureSprite = new UncoloredSprite(0, 0, renderTextureTextureRegion, this.getVertexBufferObjectManager()) {
@Override
protected void preDraw(final GLState pGLState, final Camera pCamera) {
if(RadialBlurExample.this.mRadialBlurring) {
this.setShaderProgram(RadialBlurShaderProgram.getInstance());
} else {
this.setShaderProgram(PositionTextureCoordinatesShaderProgram.getInstance());
}
super.preDraw(pGLState, pCamera);
GLES20.glUniform2f(RadialBlurShaderProgram.sUniformRadialBlurCenterLocation, RadialBlurExample.this.mRadialBlurCenterX, 1 - RadialBlurExample.this.mRadialBlurCenterY);
}
};
}
};
}
@Override
public void onCreateResources() {
BitmapTextureAtlasTextureRegionFactory.setAssetBasePath("gfx/");
this.mBitmapTextureAtlas = new BitmapTextureAtlas(this.getTextureManager(), 512, 512);
this.mFaceTextureRegion = BitmapTextureAtlasTextureRegionFactory.createFromAsset(this.mBitmapTextureAtlas, this, "badge_large.png", 0, 0);
this.mBitmapTextureAtlas.load();
this.getShaderProgramManager().loadShaderProgram(RadialBlurShaderProgram.getInstance());
}
@Override
public Scene onCreateScene() {
this.mEngine.registerUpdateHandler(new FPSLogger());
final Scene scene = new Scene();
/* Calculate the coordinates for the face, so its centered on the camera. */
final float centerX = (RadialBlurExample.CAMERA_WIDTH - this.mFaceTextureRegion.getWidth())/2;
final float centerY = (RadialBlurExample.CAMERA_HEIGHT - this.mFaceTextureRegion.getHeight())/2;
/* Create the face and add it to the scene. */
final Sprite face = new Sprite(centerX, centerY, this.mFaceTextureRegion, this.getVertexBufferObjectManager());
// face.setScale(3);
scene.attachChild(face);
/* TouchListener */
this.mClickDetector = new ClickDetector(this);
scene.setOnSceneTouchListener(this);
return scene;
}
@Override
public void onClick(final ClickDetector pClickDetector, final int pPointerID, final float pSceneX, final float pSceneY) {
this.mRadialBlurring = !this.mRadialBlurring;
}
@Override
public boolean onSceneTouchEvent(final Scene pScene, final TouchEvent pSceneTouchEvent) {
this.mClickDetector.onSceneTouchEvent(pScene, pSceneTouchEvent);
this.mRadialBlurCenterX = pSceneTouchEvent.getMotionEvent().getX()/this.mCamera.getSurfaceWidth();
this.mRadialBlurCenterY = pSceneTouchEvent.getMotionEvent().getY()/this.mCamera.getSurfaceHeight();
return true;
}
// ===========================================================
// Methods
// ===========================================================
// ===========================================================
// Inner and Anonymous Classes
// ===========================================================
public static class RadialBlurShaderProgram extends ShaderProgram {
// ===========================================================
// Constants
// ===========================================================
private static RadialBlurShaderProgram INSTANCE;
public static final String VERTEXSHADER =
"uniform mat4 " + ShaderProgramConstants.UNIFORM_MODELVIEWPROJECTIONMATRIX + ";\n" +
"attribute vec4 " + ShaderProgramConstants.ATTRIBUTE_POSITION + ";\n" +
"attribute vec2 " + ShaderProgramConstants.ATTRIBUTE_TEXTURECOORDINATES + ";\n" +
"varying vec2 " + ShaderProgramConstants.VARYING_TEXTURECOORDINATES + ";\n" +
"void main() {\n" +
" " + ShaderProgramConstants.VARYING_TEXTURECOORDINATES + " = " + ShaderProgramConstants.ATTRIBUTE_TEXTURECOORDINATES + ";\n" +
" gl_Position = " + ShaderProgramConstants.UNIFORM_MODELVIEWPROJECTIONMATRIX + " * " + ShaderProgramConstants.ATTRIBUTE_POSITION + ";\n" +
"}";
private static final String UNIFORM_RADIALBLUR_CENTER = "u_radialblur_center";
public static final String FRAGMENTSHADER =
"precision lowp float;\n" +
"uniform sampler2D " + ShaderProgramConstants.UNIFORM_TEXTURE_0 + ";\n" +
"varying mediump vec2 " + ShaderProgramConstants.VARYING_TEXTURECOORDINATES + ";\n" +
"uniform vec2 " + RadialBlurShaderProgram.UNIFORM_RADIALBLUR_CENTER + ";\n" +
"const float sampleShare = (1.0/11.0);\n" +
"const float sampleDist = 1.0;\n" +
"const float sampleStrength = 1.25;\n" +
"void main() {\n" +
/* The actual (unburred) sample. */
" vec4 color = texture2D(" + ShaderProgramConstants.UNIFORM_TEXTURE_0 + ", " + ShaderProgramConstants.VARYING_TEXTURECOORDINATES + ");\n" +
/* Calculate direction towards center of the blur. */
" vec2 direction = " + RadialBlurShaderProgram.UNIFORM_RADIALBLUR_CENTER + " - " + ShaderProgramConstants.VARYING_TEXTURECOORDINATES + ";\n" +
/* Calculate the distance to the center of the blur. */
" float distance = sqrt(direction.x * direction.x + direction.y * direction.y);\n" +
/* Normalize the direction (reuse the distance). */
" direction = direction/distance;\n" +
" vec4 sum = color * sampleShare;\n" +
/* Take 10 additional samples along the direction towards the center of the blur. */
" vec2 directionSampleDist = direction * sampleDist;\n" +
" sum += texture2D(" + ShaderProgramConstants.UNIFORM_TEXTURE_0 + ", " + ShaderProgramConstants.VARYING_TEXTURECOORDINATES + " - 0.08 * directionSampleDist) * sampleShare;\n" +
" sum += texture2D(" + ShaderProgramConstants.UNIFORM_TEXTURE_0 + ", " + ShaderProgramConstants.VARYING_TEXTURECOORDINATES + " - 0.05 * directionSampleDist) * sampleShare;\n" +
" sum += texture2D(" + ShaderProgramConstants.UNIFORM_TEXTURE_0 + ", " + ShaderProgramConstants.VARYING_TEXTURECOORDINATES + " - 0.03 * directionSampleDist) * sampleShare;\n" +
" sum += texture2D(" + ShaderProgramConstants.UNIFORM_TEXTURE_0 + ", " + ShaderProgramConstants.VARYING_TEXTURECOORDINATES + " - 0.02 * directionSampleDist) * sampleShare;\n" +
" sum += texture2D(" + ShaderProgramConstants.UNIFORM_TEXTURE_0 + ", " + ShaderProgramConstants.VARYING_TEXTURECOORDINATES + " - 0.01 * directionSampleDist) * sampleShare;\n" +
" sum += texture2D(" + ShaderProgramConstants.UNIFORM_TEXTURE_0 + ", " + ShaderProgramConstants.VARYING_TEXTURECOORDINATES + " + 0.01 * directionSampleDist) * sampleShare;\n" +
" sum += texture2D(" + ShaderProgramConstants.UNIFORM_TEXTURE_0 + ", " + ShaderProgramConstants.VARYING_TEXTURECOORDINATES + " + 0.02 * directionSampleDist) * sampleShare;\n" +
" sum += texture2D(" + ShaderProgramConstants.UNIFORM_TEXTURE_0 + ", " + ShaderProgramConstants.VARYING_TEXTURECOORDINATES + " + 0.03 * directionSampleDist) * sampleShare;\n" +
" sum += texture2D(" + ShaderProgramConstants.UNIFORM_TEXTURE_0 + ", " + ShaderProgramConstants.VARYING_TEXTURECOORDINATES + " + 0.05 * directionSampleDist) * sampleShare;\n" +
" sum += texture2D(" + ShaderProgramConstants.UNIFORM_TEXTURE_0 + ", " + ShaderProgramConstants.VARYING_TEXTURECOORDINATES + " + 0.08 * directionSampleDist) * sampleShare;\n" +
/* Weighten the blur effect with the distance to the center of the blur (further out is blurred more). */
" float t = sqrt(distance) * sampleStrength;\n" +
" t = clamp(t, 0.0, 1.0);\n" + // 0 <= t >= 1
/* Blend the original color with the averaged pixels. */
" gl_FragColor = mix(color, sum, t);\n" +
"}";
// ===========================================================
// Fields
// ===========================================================
public static int sUniformModelViewPositionMatrixLocation = ShaderProgramConstants.LOCATION_INVALID;
public static int sUniformTexture0Location = ShaderProgramConstants.LOCATION_INVALID;
public static int sUniformRadialBlurCenterLocation = ShaderProgramConstants.LOCATION_INVALID;
// ===========================================================
// Constructors
// ===========================================================
private RadialBlurShaderProgram() {
super(RadialBlurShaderProgram.VERTEXSHADER, RadialBlurShaderProgram.FRAGMENTSHADER);
}
public static RadialBlurShaderProgram getInstance() {
if(RadialBlurShaderProgram.INSTANCE == null) {
RadialBlurShaderProgram.INSTANCE = new RadialBlurShaderProgram();
}
return RadialBlurShaderProgram.INSTANCE;
}
// ===========================================================
// Getter & Setter
// ===========================================================
// ===========================================================
// Methods for/from SuperClass/Interfaces
// ===========================================================
@Override
protected void link(final GLState pGLState) throws ShaderProgramLinkException {
GLES20.glBindAttribLocation(this.mProgramID, ShaderProgramConstants.ATTRIBUTE_POSITION_LOCATION, ShaderProgramConstants.ATTRIBUTE_POSITION);
GLES20.glBindAttribLocation(this.mProgramID, ShaderProgramConstants.ATTRIBUTE_TEXTURECOORDINATES_LOCATION, ShaderProgramConstants.ATTRIBUTE_TEXTURECOORDINATES);
super.link(pGLState);
RadialBlurShaderProgram.sUniformModelViewPositionMatrixLocation = this.getUniformLocation(ShaderProgramConstants.UNIFORM_MODELVIEWPROJECTIONMATRIX);
RadialBlurShaderProgram.sUniformTexture0Location = this.getUniformLocation(ShaderProgramConstants.UNIFORM_TEXTURE_0);
RadialBlurShaderProgram.sUniformRadialBlurCenterLocation = this.getUniformLocation(RadialBlurShaderProgram.UNIFORM_RADIALBLUR_CENTER);
}
@Override
public void bind(final GLState pGLState, final VertexBufferObjectAttributes pVertexBufferObjectAttributes) {
GLES20.glDisableVertexAttribArray(ShaderProgramConstants.ATTRIBUTE_COLOR_LOCATION);
super.bind(pGLState, pVertexBufferObjectAttributes);
GLES20.glUniformMatrix4fv(RadialBlurShaderProgram.sUniformModelViewPositionMatrixLocation, 1, false, pGLState.getModelViewProjectionGLMatrix(), 0);
GLES20.glUniform1i(RadialBlurShaderProgram.sUniformTexture0Location, 0);
}
@Override
public void unbind(final GLState pGLState) throws ShaderProgramException {
GLES20.glEnableVertexAttribArray(ShaderProgramConstants.ATTRIBUTE_COLOR_LOCATION);
super.unbind(pGLState);
}
// ===========================================================
// Methods
// ===========================================================
// ===========================================================
// Inner and Anonymous Classes
// ===========================================================
}
}