Java GLES20.glClear方法代碼示例

import android.opengl.GLES20; //導入方法依賴的package包/類
private VideoCodecStatus encodeTextureBuffer(VideoFrame videoFrame) {
  encodeThreadChecker.checkIsOnValidThread();
  try {
    // TODO(perkj): glClear() shouldn't be necessary since every pixel is covered anyway,
    // but it's a workaround for bug webrtc:5147.
    GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT);
    // It is not necessary to release this frame because it doesn't own the buffer.
    VideoFrame derotatedFrame =
        new VideoFrame(videoFrame.getBuffer(), 0 /* rotation */, videoFrame.getTimestampNs());
    videoFrameDrawer.drawFrame(derotatedFrame, textureDrawer, null /* additionalRenderMatrix */);
    textureEglBase.swapBuffers(videoFrame.getTimestampNs());
  } catch (RuntimeException e) {
    Logging.e(TAG, "encodeTexture failed", e);
    return VideoCodecStatus.ERROR;
  }
  return VideoCodecStatus.OK;
}
 

import android.opengl.GLES20; //導入方法依賴的package包/類
@Override
public void onDrawFrame(GL10 gl) {

	if (width == 0 || height == 0) {
		return;
	}

	SystemTime.tick();
	long rightNow = SystemClock.elapsedRealtime();
	step = (now == 0 ? 0 : rightNow - now);
	now = rightNow;

	step();

	NoosaScript.get().resetCamera();
	NoosaScriptNoLighting.get().resetCamera();
	GLES20.glDisable(GLES20.GL_SCISSOR_TEST);
	GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT);
	draw();
}
 

import android.opengl.GLES20; //導入方法依賴的package包/類
/**
 * Generates a frame of data using GL commands.
 */
private void generateFrame(int frameIndex) {
    final int BOX_SIZE = 80;
    frameIndex %= 240;
    int xpos, ypos;

    int absIndex = Math.abs(frameIndex - 120);
    xpos = absIndex * WIDTH / 120;
    ypos = absIndex * HEIGHT / 120;

    float lumaf = absIndex / 120.0f;

    GLES20.glClearColor(lumaf, lumaf, lumaf, 1.0f);
    GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT);

    GLES20.glEnable(GLES20.GL_SCISSOR_TEST);
    GLES20.glScissor(BOX_SIZE / 2, ypos, BOX_SIZE, BOX_SIZE);
    GLES20.glClearColor(1.0f, 0.0f, 0.0f, 1.0f);
    GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT);
    GLES20.glScissor(xpos, BOX_SIZE / 2, BOX_SIZE, BOX_SIZE);
    GLES20.glClearColor(0.0f, 1.0f, 0.0f, 1.0f);
    GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT);
    GLES20.glDisable(GLES20.GL_SCISSOR_TEST);
}
 

import android.opengl.GLES20; //導入方法依賴的package包/類
@Override
public void onDrawFrame(GL10 gl) {
    //Log.i(LOGTAG, "onDrawFrame start");

    if (!mHaveFBO)
        return;

    synchronized(this) {
        if (mUpdateST) {
            mSTexture.updateTexImage();
            mUpdateST = false;
        }

        GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT);

        CameraTextureListener texListener = mView.getCameraTextureListener();
        if(texListener != null) {
            //Log.d(LOGTAG, "haveUserCallback");
            // texCamera(OES) -> texFBO
            drawTex(texCamera[0], true, FBO[0]);

            // call user code (texFBO -> texDraw)
            boolean modified = texListener.onCameraTexture(texFBO[0], texDraw[0], mCameraWidth, mCameraHeight);

            if(modified) {
                // texDraw -> screen
                drawTex(texDraw[0], false, 0);
            } else {
                // texFBO -> screen
                drawTex(texFBO[0], false, 0);
            }
        } else {
            Log.d(LOGTAG, "texCamera(OES) -> screen");
            // texCamera(OES) -> screen
            drawTex(texCamera[0], true, 0);
        }
        //Log.i(LOGTAG, "onDrawFrame end");
    }
}
 

import android.opengl.GLES20; //導入方法依賴的package包/類
/**
     * 每繪製一幀時，這個方法都會被調用。
     * 在這個方法中，一定要繪製一些東西，即使隻是清空屏幕
     * todo test.因為：在這個方法返回後，渲染緩衝區會被交換並顯示到屏幕上，如果什麽都沒有畫，可能會看到糟糕的閃爍效果
     * @param gl
     */
    @Override
    public void onDrawFrame(GL10 gl) {
        //清空屏幕，擦除屏幕上的所有顏色，並用之前glClearColor()調用定義的顏色充滿整個屏幕
        GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT);
        GlUtil.checkGlError("glClear");

//        int location,
//        int count,
//        boolean transpose,
//        float[] value,
//        int offset
        //給著色器傳遞正交投影矩陣
        GLES20.glUniformMatrix4fv(uMatrixLocation, 1, false, projectionMatrix, 0);

        //3.5在屏幕上繪製
        //更新著色器代碼中的u_Color的值。與屬性不同，uniform的分量沒有默認值
//        GLES20.glUniform4f(aColorLocation, 1.0f, 1.0f, 1.0f, 1.0f);
        GlUtil.checkGlError("glUniform4f");
        //開始繪製三角形，從第0個點取6個點，共畫兩個三角形
        GLES20.glDrawArrays(GLES20.GL_TRIANGLE_FAN, 0, 6);
        GlUtil.checkGlError("glDrawArrays");

//        GLES20.glUniform4f(aColorLocation, 1.0f, 0.0f, 0.0f, 1.0f);
        GlUtil.checkGlError("glUniform4f");
        //開始繪製一條執行，從第0個點取2個點
        GLES20.glDrawArrays(GLES20.GL_LINES, 6, 2);
        GlUtil.checkGlError("glDrawArrays");

//        GLES20.glUniform4f(aColorLocation, 0.0f, 0.0f, 1.0f, 1.0f);
        //開始繪製兩個點，從第8個點開始取1個點
        GLES20.glDrawArrays(GLES20.GL_POINTS, 8, 1);

//        GLES20.glUniform4f(aColorLocation, 1.0f, 0.0f, 0.0f, 1.0f);
        //開始繪製兩個點，從第9個點開始取1個點
        GLES20.glDrawArrays(GLES20.GL_POINTS, 9, 1);

    }
 

import android.opengl.GLES20; //導入方法依賴的package包/類
private void drawTex(int tex, boolean isOES, int fbo)
{
    GLES20.glBindFramebuffer(GLES20.GL_FRAMEBUFFER, fbo);

    if(fbo == 0)
        GLES20.glViewport(0, 0, mView.getWidth(), mView.getHeight());
    else
        GLES20.glViewport(0, 0, mFBOWidth, mFBOHeight);

    GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT);

    if(isOES) {
        GLES20.glUseProgram(progOES);
        GLES20.glVertexAttribPointer(vPosOES, 2, GLES20.GL_FLOAT, false, 4*2, vert);
        GLES20.glVertexAttribPointer(vTCOES,  2, GLES20.GL_FLOAT, false, 4*2, texOES);
    } else {
        GLES20.glUseProgram(prog2D);
        GLES20.glVertexAttribPointer(vPos2D, 2, GLES20.GL_FLOAT, false, 4*2, vert);
        GLES20.glVertexAttribPointer(vTC2D,  2, GLES20.GL_FLOAT, false, 4*2, tex2D);
    }

    GLES20.glActiveTexture(GLES20.GL_TEXTURE0);

    if(isOES) {
        GLES20.glBindTexture(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, tex);
        GLES20.glUniform1i(GLES20.glGetUniformLocation(progOES, "sTexture"), 0);
    } else {
        GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, tex);
        GLES20.glUniform1i(GLES20.glGetUniformLocation(prog2D, "sTexture"), 0);
    }

    GLES20.glDrawArrays(GLES20.GL_TRIANGLE_STRIP, 0, 4);
    GLES20.glFlush();
}
 

import android.opengl.GLES20; //導入方法依賴的package包/類
@Override
public void onDrawFrame(GL10 unused) {
    float[] scratch = new float[16];

    // Draw background color
    GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT | GLES20.GL_DEPTH_BUFFER_BIT);

    // Set the camera position (View matrix)
    Matrix.setLookAtM(mViewMatrix, 0, 0, 0, -3, 0f, 0f, 0f, 0f, 1.0f, 0.0f);

    // Calculate the projection and view transformation
    Matrix.multiplyMM(mMVPMatrix, 0, mProjectionMatrix, 0, mViewMatrix, 0);

    // Draw square
    mSquare.draw(mMVPMatrix);

    // Create a rotation for the triangle

    // Use the following code to generate constant rotation.
    // Leave this code out when using TouchEvents.
    // long time = SystemClock.uptimeMillis() % 4000L;
    // float angle = 0.090f * ((int) time);

    Matrix.setRotateM(mRotationMatrix, 0, mAngle, 0, 0, 1.0f);

    // Combine the rotation matrix with the projection and camera view
    // Note that the mMVPMatrix factor *must be first* in order
    // for the matrix multiplication product to be correct.
    Matrix.multiplyMM(scratch, 0, mMVPMatrix, 0, mRotationMatrix, 0);

    // Draw triangle
    mTriangle.draw(scratch);
}
 

import android.opengl.GLES20; //導入方法依賴的package包/類
public static void glClear(final int aClearMask)
{
    //.if DESKTOP
    //|gl.glClear(aClearMask);
    //.elseif ANDROID
    GLES20.glClear(aClearMask);
    //.endif
    
}
 

import android.opengl.GLES20; //導入方法依賴的package包/類
/**
 * clear data from surface using opengl
 */
private void clearSurface(Object texture) {
  EGL10 egl = (EGL10) EGLContext.getEGL();
  EGLDisplay display = egl.eglGetDisplay(EGL10.EGL_DEFAULT_DISPLAY);
  egl.eglInitialize(display, null);

  int[] attribList = {
      EGL10.EGL_RED_SIZE, 8, EGL10.EGL_GREEN_SIZE, 8, EGL10.EGL_BLUE_SIZE, 8,
      EGL10.EGL_ALPHA_SIZE, 8, EGL10.EGL_RENDERABLE_TYPE, EGL10.EGL_WINDOW_BIT, EGL10.EGL_NONE, 0,
      // placeholder for recordable [@-3]
      EGL10.EGL_NONE
  };
  EGLConfig[] configs = new EGLConfig[1];
  int[] numConfigs = new int[1];
  egl.eglChooseConfig(display, attribList, configs, configs.length, numConfigs);
  EGLConfig config = configs[0];
  EGLContext context = egl.eglCreateContext(display, config, EGL10.EGL_NO_CONTEXT, new int[] {
      12440, 2, EGL10.EGL_NONE
  });
  EGLSurface eglSurface = egl.eglCreateWindowSurface(display, config, texture, new int[] {
      EGL10.EGL_NONE
  });

  egl.eglMakeCurrent(display, eglSurface, eglSurface, context);
  GLES20.glClearColor(0, 0, 0, 1);
  GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT);
  egl.eglSwapBuffers(display, eglSurface);
  egl.eglDestroySurface(display, eglSurface);
  egl.eglMakeCurrent(display, EGL10.EGL_NO_SURFACE, EGL10.EGL_NO_SURFACE, EGL10.EGL_NO_CONTEXT);
  egl.eglDestroyContext(display, context);
  egl.eglTerminate(display);
}
 

import android.opengl.GLES20; //導入方法依賴的package包/類
public void draw() {
    if (mBlendng) {
        GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT);
    } else {
        GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT | GLES20.GL_DEPTH_BUFFER_BIT);
    }
    // Do a compile rotation every 10 seconds.
    long time = SystemClock.uptimeMillis() % 10000L;
    float angleInDegrees = (360.0f / 10000.0f) * ((int) time);

    // Set our pre-vertex lighting program.
    GLES20.glUseProgram(mProgramHandle);

    // Set program handle for cube drawing.
    mMVPMatrixHandle = GLES20.glGetUniformLocation(mProgramHandle, "u_MVPMatrix");

    mPositionHandle = GLES20.glGetAttribLocation(mProgramHandle, "a_Position");
    mColorHandle = GLES20.glGetAttribLocation(mProgramHandle, "a_Color");

    // right
    Matrix.setIdentityM(mModelMatrix, 0);
    Matrix.translateM(mModelMatrix, 0, 4.0f, 0.0f, -7.0f);
    Matrix.rotateM(mModelMatrix, 0, angleInDegrees, 1.0f, 0.0f, 0.0f);
    drawCube();

    // left
    Matrix.setIdentityM(mModelMatrix, 0);
    Matrix.translateM(mModelMatrix, 0, -4.0f, 0.0f, -7.0f);
    Matrix.rotateM(mModelMatrix, 0, angleInDegrees, 0.0f, 1.0f, 0.0f);
    drawCube();

    // top
    Matrix.setIdentityM(mModelMatrix, 0);
    Matrix.translateM(mModelMatrix, 0, 0.0f, 4.0f, -7.0f);
    Matrix.rotateM(mModelMatrix, 0, angleInDegrees, 0.0f, 0.0f, 1.0f);
    drawCube();

    // bottom
    Matrix.setIdentityM(mModelMatrix, 0);
    Matrix.translateM(mModelMatrix, 0, 0.0f, -4.0f, -7.0f);
    Matrix.rotateM(mModelMatrix, 0, angleInDegrees, 0.0f, 1.0f, 0.0f);
    drawCube();

    // center
    Matrix.setIdentityM(mModelMatrix, 0);
    Matrix.translateM(mModelMatrix, 0, 0.0f, 0.0f, -5.0f);
    Matrix.rotateM(mModelMatrix, 0, angleInDegrees, 1.0f, 1.0f, 1.0f);
    drawCube();
}
 

import android.opengl.GLES20; //導入方法依賴的package包/類
@Override
    public void run() {
        initGL(surfaceTexture);

        // Setup camera filters map
        cameraFilterMap.append(R.string.filter0, new OriginalFilter(context));
        cameraFilterMap.append(R.string.filter1, new AsciiArtFilter(context));
        cameraFilterMap.append(R.string.filter2, new BasicDeformFilter(context));
        cameraFilterMap.append(R.string.filter3, new BlueorangeFilter(context));
        cameraFilterMap.append(R.string.filter4, new ChromaticAberrationFilter(context));
        cameraFilterMap.append(R.string.filter5, new ContrastFilter(context));
        cameraFilterMap.append(R.string.filter6, new CrackedFilter(context));
        cameraFilterMap.append(R.string.filter7, new CrosshatchFilter(context));
        cameraFilterMap.append(R.string.filter8, new EdgeDetectionFilter(context));
        cameraFilterMap.append(R.string.filter9, new EMInterferenceFilter(context));
        cameraFilterMap.append(R.string.filter10, new LegofiedFilter(context));
        cameraFilterMap.append(R.string.filter11, new LichtensteinEsqueFilter(context));
        cameraFilterMap.append(R.string.filter12, new MappingFilter(context));
        cameraFilterMap.append(R.string.filter13, new MoneyFilter(context));
        cameraFilterMap.append(R.string.filter14, new NoiseWarpFilter(context));
        cameraFilterMap.append(R.string.filter15, new PixelizeFilter(context));
        cameraFilterMap.append(R.string.filter16, new PolygonizationFilter(context));
        cameraFilterMap.append(R.string.filter17, new RefractionFilter(context));
        cameraFilterMap.append(R.string.filter18, new TileMosaicFilter(context));
        cameraFilterMap.append(R.string.filter19, new TrianglesMosaicFilter(context));
        cameraFilterMap.append(R.string.filter20, new BeautyFilter(context));
        setSelectedFilter(selectedFilterId);

        // Create texture for camera preview
//        cameraTextureId = MyGLUtils.genTexture(GLES11Ext.GL_TEXTURE_EXTERNAL_OES);
//        cameraSurfaceTexture = new SurfaceTexture(cameraTextureId);

        // Start camera preview
//        try {
//            camera.setPreviewTexture(cameraSurfaceTexture);
//            camera.startPreview();
//        } catch (IOException ioe) {
//            // Something bad happened
//        }

        // Render loop
        while (!Thread.currentThread().isInterrupted()) {
            try {
                if (gwidth < 0 && gheight < 0)
                    GLES20.glViewport(0, 0, gwidth = -gwidth, gheight = -gheight);

                GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT);

                // Update the camera preview texture
                synchronized (this) {
                    cameraSurfaceTexture.updateTexImage();
                }

                // Draw camera preview
                selectedFilter.draw(cameraTextureId, gwidth, gheight);

                // Flush
                GLES20.glFlush();
                egl10.eglSwapBuffers(eglDisplay, eglSurface);

                Thread.sleep(DRAW_INTERVAL);

            } catch (InterruptedException e) {
                Thread.currentThread().interrupt();
            }
        }

        cameraSurfaceTexture.release();
        GLES20.glDeleteTextures(1, new int[]{cameraTextureId}, 0);
    }
 

import android.opengl.GLES20; //導入方法依賴的package包/類
/**
 * Test disposing the SurfaceTextureHelper while holding a pending texture frame. The pending
 * texture frame should still be valid, and this is tested by drawing the texture frame to a pixel
 * buffer and reading it back with glReadPixels().
 */
@Test
@MediumTest
public void testLateReturnFrame() throws InterruptedException {
  final int width = 16;
  final int height = 16;
  // Create EGL base with a pixel buffer as display output.
  final EglBase eglBase = EglBase.create(null, EglBase.CONFIG_PIXEL_BUFFER);
  eglBase.createPbufferSurface(width, height);

  // Create SurfaceTextureHelper and listener.
  final SurfaceTextureHelper surfaceTextureHelper = SurfaceTextureHelper.create(
      "SurfaceTextureHelper test" /* threadName */, eglBase.getEglBaseContext());
  final MockTextureListener listener = new MockTextureListener();
  surfaceTextureHelper.startListening(listener);
  surfaceTextureHelper.getSurfaceTexture().setDefaultBufferSize(width, height);

  // Create resources for stubbing an OES texture producer. |eglOesBase| has the SurfaceTexture in
  // |surfaceTextureHelper| as the target EGLSurface.
  final EglBase eglOesBase = EglBase.create(eglBase.getEglBaseContext(), EglBase.CONFIG_PLAIN);
  eglOesBase.createSurface(surfaceTextureHelper.getSurfaceTexture());
  assertEquals(eglOesBase.surfaceWidth(), width);
  assertEquals(eglOesBase.surfaceHeight(), height);

  final int red = 79;
  final int green = 66;
  final int blue = 161;
  // Draw a constant color frame onto the SurfaceTexture.
  eglOesBase.makeCurrent();
  GLES20.glClearColor(red / 255.0f, green / 255.0f, blue / 255.0f, 1.0f);
  GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT);
  // swapBuffers() will ultimately trigger onTextureFrameAvailable().
  eglOesBase.swapBuffers();
  eglOesBase.release();

  // Wait for OES texture frame.
  listener.waitForNewFrame();
  // Diconnect while holding the frame.
  surfaceTextureHelper.dispose();

  // Draw the pending texture frame onto the pixel buffer.
  eglBase.makeCurrent();
  final GlRectDrawer drawer = new GlRectDrawer();
  drawer.drawOes(
      listener.oesTextureId, listener.transformMatrix, width, height, 0, 0, width, height);
  drawer.release();

  // Download the pixels in the pixel buffer as RGBA. Not all platforms support RGB, e.g. Nexus 9.
  final ByteBuffer rgbaData = ByteBuffer.allocateDirect(width * height * 4);
  GLES20.glReadPixels(0, 0, width, height, GLES20.GL_RGBA, GLES20.GL_UNSIGNED_BYTE, rgbaData);
  GlUtil.checkNoGLES2Error("glReadPixels");
  eglBase.release();

  // Assert rendered image is expected constant color.
  while (rgbaData.hasRemaining()) {
    assertEquals(rgbaData.get() & 0xFF, red);
    assertEquals(rgbaData.get() & 0xFF, green);
    assertEquals(rgbaData.get() & 0xFF, blue);
    assertEquals(rgbaData.get() & 0xFF, 255);
  }
  // Late frame return after everything has been disposed and released.
  surfaceTextureHelper.returnTextureFrame();
}