nxpandroid | 64fd68c | 2015-09-23 16:45:15 +0530 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2011 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | |
| 18 | package com.android.nfc.beam; |
| 19 | |
| 20 | import android.content.Context; |
| 21 | import android.graphics.Bitmap; |
| 22 | import android.graphics.BitmapFactory; |
| 23 | import android.graphics.SurfaceTexture; |
| 24 | import android.opengl.GLUtils; |
| 25 | import android.util.Log; |
| 26 | |
| 27 | import java.io.IOException; |
| 28 | import java.io.InputStream; |
| 29 | import java.nio.ByteBuffer; |
| 30 | import java.nio.ByteOrder; |
| 31 | import java.nio.FloatBuffer; |
| 32 | import java.nio.ShortBuffer; |
| 33 | |
| 34 | import javax.microedition.khronos.egl.EGL10; |
| 35 | import javax.microedition.khronos.egl.EGLConfig; |
| 36 | import javax.microedition.khronos.egl.EGLContext; |
| 37 | import javax.microedition.khronos.egl.EGLDisplay; |
| 38 | import javax.microedition.khronos.egl.EGLSurface; |
| 39 | import javax.microedition.khronos.opengles.GL10; |
| 40 | |
| 41 | public class FireflyRenderer { |
| 42 | private static final String LOG_TAG = "NfcFireflyThread"; |
| 43 | |
| 44 | static final int NUM_FIREFLIES = 200; |
| 45 | |
| 46 | static final float NEAR_CLIPPING_PLANE = 50f; |
| 47 | static final float FAR_CLIPPING_PLANE = 100f; |
| 48 | |
| 49 | // All final variables below only need to be allocated once |
| 50 | // and can be reused between subsequent Beams |
| 51 | static final int[] sEglConfig = { |
| 52 | EGL10.EGL_RED_SIZE, 8, |
| 53 | EGL10.EGL_GREEN_SIZE, 8, |
| 54 | EGL10.EGL_BLUE_SIZE, 8, |
| 55 | EGL10.EGL_ALPHA_SIZE, 0, |
| 56 | EGL10.EGL_DEPTH_SIZE, 0, |
| 57 | EGL10.EGL_STENCIL_SIZE, 0, |
| 58 | EGL10.EGL_NONE |
| 59 | }; |
| 60 | |
| 61 | // Vertices for drawing a 32x32 rect |
| 62 | static final float mVertices[] = { |
| 63 | 0.0f, 0.0f, 0.0f, // 0, Top Left |
| 64 | 0.0f, 32.0f, 0.0f, // 1, Bottom Left |
| 65 | 32.0f, 32.0f, 0.0f, // 2, Bottom Right |
| 66 | 32.0f, 0.0f, 0.0f, // 3, Top Right |
| 67 | }; |
| 68 | |
| 69 | // Mapping coordinates for the texture |
| 70 | static final float mTextCoords[] = { |
| 71 | 0.0f, 0.0f, |
| 72 | 1.0f, 0.0f, |
| 73 | 1.0f, 1.0f, |
| 74 | 0.0f, 1.0f |
| 75 | }; |
| 76 | |
| 77 | // Connecting order (draws a square) |
| 78 | static final short[] mIndices = { 0, 1, 2, 0, 2, 3 }; |
| 79 | |
| 80 | final Context mContext; |
| 81 | |
| 82 | // Buffer holding the vertices |
| 83 | final FloatBuffer mVertexBuffer; |
| 84 | |
| 85 | // Buffer holding the indices |
| 86 | final ShortBuffer mIndexBuffer; |
| 87 | |
| 88 | // Buffer holding the texture mapping coordinates |
| 89 | final FloatBuffer mTextureBuffer; |
| 90 | |
| 91 | final Firefly[] mFireflies; |
| 92 | |
| 93 | FireflyRenderThread mFireflyRenderThread; |
| 94 | |
| 95 | // The surface to render the flies on, including width and height |
| 96 | SurfaceTexture mSurface; |
| 97 | int mDisplayWidth; |
| 98 | int mDisplayHeight; |
| 99 | |
| 100 | public FireflyRenderer(Context context) { |
| 101 | mContext = context; |
| 102 | |
| 103 | // First, build the vertex, texture and index buffers |
| 104 | ByteBuffer vbb = ByteBuffer.allocateDirect(mVertices.length * 4); // Float => 4 bytes |
| 105 | vbb.order(ByteOrder.nativeOrder()); |
| 106 | mVertexBuffer = vbb.asFloatBuffer(); |
| 107 | mVertexBuffer.put(mVertices); |
| 108 | mVertexBuffer.position(0); |
| 109 | |
| 110 | ByteBuffer ibb = ByteBuffer.allocateDirect(mIndices.length * 2); // Short => 2 bytes |
| 111 | ibb.order(ByteOrder.nativeOrder()); |
| 112 | mIndexBuffer = ibb.asShortBuffer(); |
| 113 | mIndexBuffer.put(mIndices); |
| 114 | mIndexBuffer.position(0); |
| 115 | |
| 116 | ByteBuffer tbb = ByteBuffer.allocateDirect(mTextCoords.length * 4); |
| 117 | tbb.order(ByteOrder.nativeOrder()); |
| 118 | mTextureBuffer = tbb.asFloatBuffer(); |
| 119 | mTextureBuffer.put(mTextCoords); |
| 120 | mTextureBuffer.position(0); |
| 121 | |
| 122 | mFireflies = new Firefly[NUM_FIREFLIES]; |
| 123 | for (int i = 0; i < NUM_FIREFLIES; i++) { |
| 124 | mFireflies[i] = new Firefly(); |
| 125 | } |
| 126 | } |
| 127 | |
| 128 | /** |
| 129 | * Starts rendering fireflies on the given surface. |
| 130 | * Must be called from the UI-thread. |
| 131 | */ |
| 132 | public void start(SurfaceTexture surface, int width, int height) { |
| 133 | mSurface = surface; |
| 134 | mDisplayWidth = width; |
| 135 | mDisplayHeight = height; |
| 136 | |
| 137 | mFireflyRenderThread = new FireflyRenderThread(); |
| 138 | mFireflyRenderThread.start(); |
| 139 | } |
| 140 | |
| 141 | /** |
| 142 | * Stops rendering fireflies. |
| 143 | * Must be called from the UI-thread. |
| 144 | */ |
| 145 | public void stop() { |
| 146 | if (mFireflyRenderThread != null) { |
| 147 | mFireflyRenderThread.finish(); |
| 148 | try { |
| 149 | mFireflyRenderThread.join(); |
| 150 | } catch (InterruptedException e) { |
| 151 | Log.e(LOG_TAG, "Couldn't wait for FireflyRenderThread."); |
| 152 | } |
| 153 | mFireflyRenderThread = null; |
| 154 | } |
| 155 | } |
| 156 | |
| 157 | private class FireflyRenderThread extends Thread { |
| 158 | EGL10 mEgl; |
| 159 | EGLDisplay mEglDisplay; |
| 160 | EGLConfig mEglConfig; |
| 161 | EGLContext mEglContext; |
| 162 | EGLSurface mEglSurface; |
| 163 | GL10 mGL; |
| 164 | |
| 165 | // Holding the handle to the texture |
| 166 | int mTextureId; |
| 167 | |
| 168 | // Read/written by multiple threads |
| 169 | volatile boolean mFinished; |
| 170 | |
| 171 | @Override |
| 172 | public void run() { |
| 173 | if (!initGL()) { |
| 174 | Log.e(LOG_TAG, "Failed to initialize OpenGL."); |
| 175 | return; |
| 176 | } |
| 177 | loadStarTexture(); |
| 178 | |
| 179 | mGL.glClearColor(0.0f, 0.0f, 0.0f, 1.0f); |
| 180 | |
| 181 | mGL.glViewport(0, 0, mDisplayWidth, mDisplayHeight); |
| 182 | |
| 183 | // make adjustments for screen ratio |
| 184 | mGL.glMatrixMode(GL10.GL_PROJECTION); |
nxpandroid | 281eb92 | 2016-08-25 20:27:46 +0530 | [diff] [blame] | 185 | mGL.glLoadIdentity(); |
nxpandroid | 64fd68c | 2015-09-23 16:45:15 +0530 | [diff] [blame] | 186 | mGL.glFrustumf(-mDisplayWidth, mDisplayWidth, mDisplayHeight, -mDisplayHeight, NEAR_CLIPPING_PLANE, FAR_CLIPPING_PLANE); |
| 187 | |
| 188 | // Switch back to modelview |
| 189 | mGL.glMatrixMode(GL10.GL_MODELVIEW); |
| 190 | mGL.glLoadIdentity(); |
| 191 | |
| 192 | mGL.glHint(GL10.GL_PERSPECTIVE_CORRECTION_HINT, GL10.GL_NICEST); |
| 193 | mGL.glDepthMask(true); |
| 194 | |
| 195 | |
| 196 | for (Firefly firefly : mFireflies) { |
| 197 | firefly.reset(); |
| 198 | } |
| 199 | |
| 200 | for (int i = 0; i < 3; i++) { |
| 201 | // Call eglSwapBuffers 3 times - this will allocate the necessary |
| 202 | // buffers, and make sure the animation looks smooth from the start. |
| 203 | mGL.glClear(GL10.GL_COLOR_BUFFER_BIT); |
| 204 | if (!mEgl.eglSwapBuffers(mEglDisplay, mEglSurface)) { |
| 205 | Log.e(LOG_TAG, "Could not swap buffers"); |
| 206 | mFinished = true; |
| 207 | } |
| 208 | } |
| 209 | |
| 210 | long startTime = System.currentTimeMillis(); |
| 211 | |
| 212 | while (!mFinished) { |
| 213 | long timeElapsedMs = System.currentTimeMillis() - startTime; |
| 214 | startTime = System.currentTimeMillis(); |
| 215 | |
| 216 | checkCurrent(); |
| 217 | |
| 218 | mGL.glClear(GL10.GL_COLOR_BUFFER_BIT); |
| 219 | mGL.glLoadIdentity(); |
| 220 | |
| 221 | mGL.glEnable(GL10.GL_TEXTURE_2D); |
| 222 | mGL.glEnable(GL10.GL_BLEND); |
| 223 | mGL.glBlendFunc(GL10.GL_SRC_ALPHA, GL10.GL_ONE); |
| 224 | |
| 225 | for (Firefly firefly : mFireflies) { |
| 226 | firefly.updatePositionAndScale(timeElapsedMs); |
| 227 | firefly.draw(mGL); |
| 228 | } |
| 229 | |
| 230 | if (!mEgl.eglSwapBuffers(mEglDisplay, mEglSurface)) { |
| 231 | Log.e(LOG_TAG, "Could not swap buffers"); |
| 232 | mFinished = true; |
| 233 | } |
| 234 | |
| 235 | long elapsed = System.currentTimeMillis() - startTime; |
| 236 | try { |
| 237 | Thread.sleep(Math.max(30 - elapsed, 0)); |
| 238 | } catch (InterruptedException e) { |
| 239 | |
| 240 | } |
| 241 | } |
| 242 | finishGL(); |
| 243 | } |
| 244 | |
| 245 | public void finish() { |
| 246 | mFinished = true; |
| 247 | } |
| 248 | |
| 249 | void loadStarTexture() { |
| 250 | int[] textureIds = new int[1]; |
| 251 | mGL.glGenTextures(1, textureIds, 0); |
| 252 | mTextureId = textureIds[0]; |
| 253 | |
| 254 | InputStream in = null; |
| 255 | try { |
| 256 | // Remember that both texture dimensions must be a power of 2! |
| 257 | in = mContext.getAssets().open("star.png"); |
| 258 | |
| 259 | Bitmap bitmap = BitmapFactory.decodeStream(in); |
| 260 | mGL.glBindTexture(GL10.GL_TEXTURE_2D, mTextureId); |
| 261 | |
| 262 | mGL.glTexParameterx(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MIN_FILTER, GL10.GL_LINEAR); |
| 263 | mGL.glTexParameterx(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MAG_FILTER, GL10.GL_LINEAR); |
| 264 | |
| 265 | GLUtils.texImage2D(GL10.GL_TEXTURE_2D, 0, bitmap, 0); |
| 266 | |
| 267 | bitmap.recycle(); |
| 268 | |
| 269 | } catch (IOException e) { |
| 270 | Log.e(LOG_TAG, "IOException opening assets."); |
| 271 | } finally { |
| 272 | if (in != null) { |
| 273 | try { |
| 274 | in.close(); |
| 275 | } catch (IOException e) { } |
| 276 | } |
| 277 | } |
| 278 | } |
| 279 | |
| 280 | private void checkCurrent() { |
| 281 | if (!mEglContext.equals(mEgl.eglGetCurrentContext()) || |
| 282 | !mEglSurface.equals(mEgl.eglGetCurrentSurface(EGL10.EGL_DRAW))) { |
| 283 | if (!mEgl.eglMakeCurrent(mEglDisplay, mEglSurface, mEglSurface, mEglContext)) { |
| 284 | throw new RuntimeException("eglMakeCurrent failed " |
| 285 | + GLUtils.getEGLErrorString(mEgl.eglGetError())); |
| 286 | } |
| 287 | } |
| 288 | } |
| 289 | |
| 290 | boolean initGL() { |
| 291 | // Initialize openGL engine |
| 292 | mEgl = (EGL10) EGLContext.getEGL(); |
| 293 | |
| 294 | mEglDisplay = mEgl.eglGetDisplay(EGL10.EGL_DEFAULT_DISPLAY); |
| 295 | if (mEglDisplay == EGL10.EGL_NO_DISPLAY) { |
| 296 | Log.e(LOG_TAG, "eglGetDisplay failed " + |
| 297 | GLUtils.getEGLErrorString(mEgl.eglGetError())); |
| 298 | return false; |
| 299 | } |
| 300 | |
| 301 | int[] version = new int[2]; |
| 302 | if (!mEgl.eglInitialize(mEglDisplay, version)) { |
| 303 | Log.e(LOG_TAG, "eglInitialize failed " + |
| 304 | GLUtils.getEGLErrorString(mEgl.eglGetError())); |
| 305 | return false; |
| 306 | } |
| 307 | |
| 308 | mEglConfig = chooseEglConfig(); |
| 309 | if (mEglConfig == null) { |
| 310 | Log.e(LOG_TAG, "eglConfig not initialized."); |
| 311 | return false; |
| 312 | } |
| 313 | |
| 314 | mEglContext = mEgl.eglCreateContext(mEglDisplay, mEglConfig, EGL10.EGL_NO_CONTEXT, null); |
| 315 | |
| 316 | mEglSurface = mEgl.eglCreateWindowSurface(mEglDisplay, mEglConfig, mSurface, null); |
| 317 | |
| 318 | if (mEglSurface == null || mEglSurface == EGL10.EGL_NO_SURFACE) { |
| 319 | int error = mEgl.eglGetError(); |
| 320 | Log.e(LOG_TAG,"createWindowSurface returned error " + Integer.toString(error)); |
| 321 | return false; |
| 322 | } |
| 323 | |
| 324 | if (!mEgl.eglMakeCurrent(mEglDisplay, mEglSurface, mEglSurface, mEglContext)) { |
| 325 | Log.e(LOG_TAG, "eglMakeCurrent failed " + |
| 326 | GLUtils.getEGLErrorString(mEgl.eglGetError())); |
| 327 | return false; |
| 328 | } |
| 329 | |
| 330 | mGL = (GL10) mEglContext.getGL(); |
| 331 | |
| 332 | return true; |
| 333 | } |
| 334 | |
| 335 | private void finishGL() { |
| 336 | if (mEgl == null || mEglDisplay == null) { |
| 337 | // Nothing to free |
| 338 | return; |
| 339 | } |
| 340 | // Unbind the current surface and context from the display |
| 341 | mEgl.eglMakeCurrent(mEglDisplay, EGL10.EGL_NO_SURFACE, EGL10.EGL_NO_SURFACE, |
| 342 | EGL10.EGL_NO_CONTEXT); |
| 343 | |
| 344 | if (mEglSurface != null) { |
| 345 | mEgl.eglDestroySurface(mEglDisplay, mEglSurface); |
| 346 | } |
| 347 | |
| 348 | if (mEglContext != null) { |
| 349 | mEgl.eglDestroyContext(mEglDisplay, mEglContext); |
| 350 | } |
| 351 | } |
| 352 | |
| 353 | private EGLConfig chooseEglConfig() { |
| 354 | int[] configsCount = new int[1]; |
| 355 | EGLConfig[] configs = new EGLConfig[1]; |
| 356 | if (!mEgl.eglChooseConfig(mEglDisplay, sEglConfig, configs, 1, configsCount)) { |
| 357 | throw new IllegalArgumentException("eglChooseConfig failed " + |
| 358 | GLUtils.getEGLErrorString(mEgl.eglGetError())); |
| 359 | } else if (configsCount[0] > 0) { |
| 360 | return configs[0]; |
| 361 | } |
| 362 | return null; |
| 363 | } |
| 364 | } |
| 365 | |
| 366 | private class Firefly { |
| 367 | static final float TEXTURE_HEIGHT = 30f; // TODO use measurement of texture size |
| 368 | static final float SPEED = .5f; |
| 369 | |
| 370 | float mX; // between -mDisplayHeight and mDisplayHeight |
| 371 | float mY; // between -mDisplayWidth and mDisplayWidth |
| 372 | float mZ; // between 0.0 (near) and 1.0 (far) |
| 373 | float mZ0; |
| 374 | float mT; |
| 375 | float mScale; |
| 376 | float mAlpha; |
| 377 | |
| 378 | public Firefly() { |
| 379 | } |
| 380 | |
| 381 | void reset() { |
| 382 | mX = (float) (Math.random() * mDisplayWidth) * 4 - 2 * mDisplayWidth; |
| 383 | mY = (float) (Math.random() * mDisplayHeight) * 4 - 2 * mDisplayHeight; |
| 384 | mZ0 = mZ = (float) (Math.random()) * 2 - 1; |
| 385 | mT = 0f; |
| 386 | mScale = 1.5f; |
| 387 | mAlpha = 0f; |
| 388 | } |
| 389 | |
| 390 | public void updatePositionAndScale(long timeElapsedMs) { |
| 391 | mT += timeElapsedMs; |
| 392 | mZ = mZ0 + mT/1000f * SPEED; |
| 393 | mAlpha = 1f-mZ; |
| 394 | if(mZ > 1.0) reset(); |
| 395 | } |
| 396 | |
| 397 | public void draw(GL10 gl) { |
| 398 | gl.glLoadIdentity(); |
| 399 | |
| 400 | // Counter clockwise winding |
| 401 | gl.glFrontFace(GL10.GL_CCW); |
| 402 | |
| 403 | gl.glEnableClientState(GL10.GL_VERTEX_ARRAY); |
| 404 | gl.glEnableClientState(GL10.GL_TEXTURE_COORD_ARRAY); |
| 405 | |
| 406 | gl.glVertexPointer(3, GL10.GL_FLOAT, 0, mVertexBuffer); |
| 407 | gl.glTexCoordPointer(2, GL10.GL_FLOAT, 0, mTextureBuffer); |
| 408 | |
| 409 | gl.glTranslatef(mX, mY, -NEAR_CLIPPING_PLANE-mZ*(FAR_CLIPPING_PLANE-NEAR_CLIPPING_PLANE)); |
| 410 | gl.glColor4f(1, 1, 1, mAlpha); |
| 411 | |
| 412 | // scale around center |
| 413 | gl.glTranslatef(TEXTURE_HEIGHT/2, TEXTURE_HEIGHT/2, 0); |
| 414 | gl.glScalef(mScale, mScale, 0); |
| 415 | gl.glTranslatef(-TEXTURE_HEIGHT/2, -TEXTURE_HEIGHT/2, 0); |
| 416 | |
| 417 | gl.glDrawElements(GL10.GL_TRIANGLES, mIndices.length, GL10.GL_UNSIGNED_SHORT, |
| 418 | mIndexBuffer); |
| 419 | |
| 420 | gl.glColor4f(1, 1, 1, 1); |
| 421 | gl.glDisableClientState(GL10.GL_TEXTURE_COORD_ARRAY); |
| 422 | gl.glDisableClientState(GL10.GL_VERTEX_ARRAY); |
| 423 | } |
| 424 | } |
| 425 | } |