SRGB_test.cpp revision 6a5d35dd5cd8710c6c9f100076e62ffbdb0b868b
1/* 2 * Copyright 2013 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#define LOG_TAG "SRGB_test" 18//#define LOG_NDEBUG 0 19 20#include "GLTest.h" 21 22#include <gui/CpuConsumer.h> 23#include <gui/Surface.h> 24#include <gui/SurfaceComposerClient.h> 25 26#include <EGL/egl.h> 27#include <EGL/eglext.h> 28#include <GLES3/gl3.h> 29 30#include <android/native_window.h> 31 32#include <gtest/gtest.h> 33 34namespace android { 35 36class SRGBTest : public ::testing::Test { 37protected: 38 // Class constants 39 enum { 40 DISPLAY_WIDTH = 512, 41 DISPLAY_HEIGHT = 512, 42 PIXEL_SIZE = 4, // bytes or components 43 DISPLAY_SIZE = DISPLAY_WIDTH * DISPLAY_HEIGHT * PIXEL_SIZE, 44 ALPHA_VALUE = 223, // should be in [0, 255] 45 TOLERANCE = 1, 46 }; 47 static const char SHOW_DEBUG_STRING[]; 48 49 SRGBTest() : 50 mInputSurface(), mCpuConsumer(), mLockedBuffer(), 51 mEglDisplay(EGL_NO_DISPLAY), mEglConfig(), 52 mEglContext(EGL_NO_CONTEXT), mEglSurface(EGL_NO_SURFACE), 53 mComposerClient(), mSurfaceControl(), mOutputSurface() { 54 } 55 56 virtual ~SRGBTest() { 57 if (mEglDisplay != EGL_NO_DISPLAY) { 58 if (mEglSurface != EGL_NO_SURFACE) { 59 eglDestroySurface(mEglDisplay, mEglSurface); 60 } 61 if (mEglContext != EGL_NO_CONTEXT) { 62 eglDestroyContext(mEglDisplay, mEglContext); 63 } 64 eglMakeCurrent(mEglDisplay, EGL_NO_SURFACE, EGL_NO_SURFACE, 65 EGL_NO_CONTEXT); 66 eglTerminate(mEglDisplay); 67 } 68 } 69 70 virtual void SetUp() { 71 mBufferQueue = new BufferQueue(); 72 ASSERT_EQ(NO_ERROR, mBufferQueue->setDefaultBufferSize( 73 DISPLAY_WIDTH, DISPLAY_HEIGHT)); 74 mCpuConsumer = new CpuConsumer(mBufferQueue, 1); 75 String8 name("CpuConsumer_for_SRGBTest"); 76 mCpuConsumer->setName(name); 77 mInputSurface = new Surface(mBufferQueue); 78 79 ASSERT_NO_FATAL_FAILURE(createEGLSurface(mInputSurface.get())); 80 ASSERT_NO_FATAL_FAILURE(createDebugSurface()); 81 } 82 83 virtual void TearDown() { 84 ASSERT_NO_FATAL_FAILURE(copyToDebugSurface()); 85 ASSERT_EQ(NO_ERROR, mCpuConsumer->unlockBuffer(mLockedBuffer)); 86 } 87 88 static float linearToSRGB(float l) { 89 if (l <= 0.0031308f) { 90 return l * 12.92f; 91 } else { 92 return 1.055f * pow(l, (1 / 2.4f)) - 0.055f; 93 } 94 } 95 96 static float srgbToLinear(float s) { 97 if (s <= 0.04045) { 98 return s / 12.92f; 99 } else { 100 return pow(((s + 0.055f) / 1.055f), 2.4f); 101 } 102 } 103 104 static uint8_t srgbToLinear(uint8_t u) { 105 float f = u / 255.0f; 106 return static_cast<uint8_t>(srgbToLinear(f) * 255.0f + 0.5f); 107 } 108 109 void fillTexture(bool writeAsSRGB) { 110 uint8_t* textureData = new uint8_t[DISPLAY_SIZE]; 111 112 for (int y = 0; y < DISPLAY_HEIGHT; ++y) { 113 for (int x = 0; x < DISPLAY_WIDTH; ++x) { 114 float realValue = static_cast<float>(x) / (DISPLAY_WIDTH - 1); 115 realValue *= ALPHA_VALUE / 255.0f; // Premultiply by alpha 116 if (writeAsSRGB) { 117 realValue = linearToSRGB(realValue); 118 } 119 120 int offset = (y * DISPLAY_WIDTH + x) * PIXEL_SIZE; 121 for (int c = 0; c < 3; ++c) { 122 uint8_t intValue = static_cast<uint8_t>( 123 realValue * 255.0f + 0.5f); 124 textureData[offset + c] = intValue; 125 } 126 textureData[offset + 3] = ALPHA_VALUE; 127 } 128 } 129 130 glTexImage2D(GL_TEXTURE_2D, 0, writeAsSRGB ? GL_SRGB8_ALPHA8 : GL_RGBA8, 131 DISPLAY_WIDTH, DISPLAY_HEIGHT, 0, GL_RGBA, GL_UNSIGNED_BYTE, 132 textureData); 133 ASSERT_EQ(GL_NO_ERROR, glGetError()); 134 135 delete[] textureData; 136 } 137 138 void initShaders() { 139 static const char vertexSource[] = 140 "attribute vec4 vPosition;\n" 141 "varying vec2 texCoords;\n" 142 "void main() {\n" 143 " texCoords = 0.5 * (vPosition.xy + vec2(1.0, 1.0));\n" 144 " gl_Position = vPosition;\n" 145 "}\n"; 146 147 static const char fragmentSource[] = 148 "precision mediump float;\n" 149 "uniform sampler2D texSampler;\n" 150 "varying vec2 texCoords;\n" 151 "void main() {\n" 152 " gl_FragColor = texture2D(texSampler, texCoords);\n" 153 "}\n"; 154 155 GLuint program; 156 { 157 SCOPED_TRACE("Creating shader program"); 158 ASSERT_NO_FATAL_FAILURE(GLTest::createProgram( 159 vertexSource, fragmentSource, &program)); 160 } 161 162 GLint positionHandle = glGetAttribLocation(program, "vPosition"); 163 ASSERT_EQ(GL_NO_ERROR, glGetError()); 164 ASSERT_NE(-1, positionHandle); 165 166 GLint samplerHandle = glGetUniformLocation(program, "texSampler"); 167 ASSERT_EQ(GL_NO_ERROR, glGetError()); 168 ASSERT_NE(-1, samplerHandle); 169 170 static const GLfloat vertices[] = { 171 -1.0f, 1.0f, 172 -1.0f, -1.0f, 173 1.0f, -1.0f, 174 1.0f, 1.0f, 175 }; 176 177 glVertexAttribPointer(positionHandle, 2, GL_FLOAT, GL_FALSE, 0, vertices); 178 ASSERT_EQ(GL_NO_ERROR, glGetError()); 179 glEnableVertexAttribArray(positionHandle); 180 ASSERT_EQ(GL_NO_ERROR, glGetError()); 181 182 glUseProgram(program); 183 ASSERT_EQ(GL_NO_ERROR, glGetError()); 184 glUniform1i(samplerHandle, 0); 185 ASSERT_EQ(GL_NO_ERROR, glGetError()); 186 187 GLuint textureHandle; 188 glGenTextures(1, &textureHandle); 189 ASSERT_EQ(GL_NO_ERROR, glGetError()); 190 glBindTexture(GL_TEXTURE_2D, textureHandle); 191 ASSERT_EQ(GL_NO_ERROR, glGetError()); 192 193 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); 194 ASSERT_EQ(GL_NO_ERROR, glGetError()); 195 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); 196 ASSERT_EQ(GL_NO_ERROR, glGetError()); 197 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); 198 ASSERT_EQ(GL_NO_ERROR, glGetError()); 199 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); 200 ASSERT_EQ(GL_NO_ERROR, glGetError()); 201 } 202 203 void drawTexture(bool asSRGB, GLint x, GLint y, GLsizei width, 204 GLsizei height) { 205 ASSERT_NO_FATAL_FAILURE(fillTexture(asSRGB)); 206 glViewport(x, y, width, height); 207 ASSERT_EQ(GL_NO_ERROR, glGetError()); 208 glDrawArrays(GL_TRIANGLE_FAN, 0, 4); 209 ASSERT_EQ(GL_NO_ERROR, glGetError()); 210 } 211 212 void checkLockedBuffer(PixelFormat format) { 213 ASSERT_EQ(mLockedBuffer.format, format); 214 ASSERT_EQ(mLockedBuffer.width, DISPLAY_WIDTH); 215 ASSERT_EQ(mLockedBuffer.height, DISPLAY_HEIGHT); 216 } 217 218 static bool withinTolerance(int a, int b) { 219 int diff = a - b; 220 return diff >= 0 ? diff <= TOLERANCE : -diff <= TOLERANCE; 221 } 222 223 // Primary producer and consumer 224 sp<BufferQueue> mBufferQueue; 225 sp<Surface> mInputSurface; 226 sp<CpuConsumer> mCpuConsumer; 227 CpuConsumer::LockedBuffer mLockedBuffer; 228 229 EGLDisplay mEglDisplay; 230 EGLConfig mEglConfig; 231 EGLContext mEglContext; 232 EGLSurface mEglSurface; 233 234 // Auxiliary display output 235 sp<SurfaceComposerClient> mComposerClient; 236 sp<SurfaceControl> mSurfaceControl; 237 sp<Surface> mOutputSurface; 238 239private: 240 void createEGLSurface(Surface* inputSurface) { 241 mEglDisplay = eglGetDisplay(EGL_DEFAULT_DISPLAY); 242 ASSERT_EQ(EGL_SUCCESS, eglGetError()); 243 ASSERT_NE(EGL_NO_DISPLAY, mEglDisplay); 244 245 EXPECT_TRUE(eglInitialize(mEglDisplay, NULL, NULL)); 246 ASSERT_EQ(EGL_SUCCESS, eglGetError()); 247 248 static const EGLint configAttribs[] = { 249 EGL_SURFACE_TYPE, EGL_WINDOW_BIT, 250 EGL_RENDERABLE_TYPE, EGL_OPENGL_ES3_BIT_KHR, 251 EGL_RED_SIZE, 8, 252 EGL_GREEN_SIZE, 8, 253 EGL_BLUE_SIZE, 8, 254 EGL_ALPHA_SIZE, 8, 255 EGL_NONE }; 256 257 EGLint numConfigs = 0; 258 EXPECT_TRUE(eglChooseConfig(mEglDisplay, configAttribs, &mEglConfig, 1, 259 &numConfigs)); 260 ASSERT_EQ(EGL_SUCCESS, eglGetError()); 261 262 static const EGLint contextAttribs[] = { 263 EGL_CONTEXT_CLIENT_VERSION, 3, 264 EGL_NONE } ; 265 266 mEglContext = eglCreateContext(mEglDisplay, mEglConfig, EGL_NO_CONTEXT, 267 contextAttribs); 268 ASSERT_EQ(EGL_SUCCESS, eglGetError()); 269 ASSERT_NE(EGL_NO_CONTEXT, mEglContext); 270 271 mEglSurface = eglCreateWindowSurface(mEglDisplay, mEglConfig, 272 inputSurface, NULL); 273 ASSERT_EQ(EGL_SUCCESS, eglGetError()); 274 ASSERT_NE(EGL_NO_SURFACE, mEglSurface); 275 276 EXPECT_TRUE(eglMakeCurrent(mEglDisplay, mEglSurface, mEglSurface, 277 mEglContext)); 278 ASSERT_EQ(EGL_SUCCESS, eglGetError()); 279 } 280 281 void createDebugSurface() { 282 if (getenv(SHOW_DEBUG_STRING) == NULL) return; 283 284 mComposerClient = new SurfaceComposerClient; 285 ASSERT_EQ(NO_ERROR, mComposerClient->initCheck()); 286 287 mSurfaceControl = mComposerClient->createSurface( 288 String8("SRGBTest Surface"), DISPLAY_WIDTH, DISPLAY_HEIGHT, 289 PIXEL_FORMAT_RGBA_8888); 290 291 ASSERT_TRUE(mSurfaceControl != NULL); 292 ASSERT_TRUE(mSurfaceControl->isValid()); 293 294 SurfaceComposerClient::openGlobalTransaction(); 295 ASSERT_EQ(NO_ERROR, mSurfaceControl->setLayer(0x7FFFFFFF)); 296 ASSERT_EQ(NO_ERROR, mSurfaceControl->show()); 297 SurfaceComposerClient::closeGlobalTransaction(); 298 299 ANativeWindow_Buffer outBuffer; 300 ARect inOutDirtyBounds; 301 mOutputSurface = mSurfaceControl->getSurface(); 302 mOutputSurface->lock(&outBuffer, &inOutDirtyBounds); 303 uint8_t* bytePointer = reinterpret_cast<uint8_t*>(outBuffer.bits); 304 for (int y = 0; y < outBuffer.height; ++y) { 305 int rowOffset = y * outBuffer.stride; // pixels 306 for (int x = 0; x < outBuffer.width; ++x) { 307 int colOffset = (rowOffset + x) * PIXEL_SIZE; // bytes 308 for (int c = 0; c < PIXEL_SIZE; ++c) { 309 int offset = colOffset + c; 310 bytePointer[offset] = ((c + 1) * 56) - 1; 311 } 312 } 313 } 314 mOutputSurface->unlockAndPost(); 315 } 316 317 void copyToDebugSurface() { 318 if (!mOutputSurface.get()) return; 319 320 size_t bufferSize = mLockedBuffer.height * mLockedBuffer.stride * 321 PIXEL_SIZE; 322 323 ANativeWindow_Buffer outBuffer; 324 ARect outBufferBounds; 325 mOutputSurface->lock(&outBuffer, &outBufferBounds); 326 ASSERT_EQ(mLockedBuffer.width, outBuffer.width); 327 ASSERT_EQ(mLockedBuffer.height, outBuffer.height); 328 ASSERT_EQ(mLockedBuffer.stride, outBuffer.stride); 329 330 if (mLockedBuffer.format == outBuffer.format) { 331 memcpy(outBuffer.bits, mLockedBuffer.data, bufferSize); 332 } else { 333 ASSERT_EQ(mLockedBuffer.format, PIXEL_FORMAT_sRGB_A_8888); 334 ASSERT_EQ(outBuffer.format, PIXEL_FORMAT_RGBA_8888); 335 uint8_t* outPointer = reinterpret_cast<uint8_t*>(outBuffer.bits); 336 for (int y = 0; y < outBuffer.height; ++y) { 337 int rowOffset = y * outBuffer.stride; // pixels 338 for (int x = 0; x < outBuffer.width; ++x) { 339 int colOffset = (rowOffset + x) * PIXEL_SIZE; // bytes 340 341 // RGB are converted 342 for (int c = 0; c < (PIXEL_SIZE - 1); ++c) { 343 outPointer[colOffset + c] = srgbToLinear( 344 mLockedBuffer.data[colOffset + c]); 345 } 346 347 // Alpha isn't converted 348 outPointer[colOffset + 3] = 349 mLockedBuffer.data[colOffset + 3]; 350 } 351 } 352 } 353 mOutputSurface->unlockAndPost(); 354 355 int sleepSeconds = atoi(getenv(SHOW_DEBUG_STRING)); 356 sleep(sleepSeconds); 357 } 358}; 359 360const char SRGBTest::SHOW_DEBUG_STRING[] = "DEBUG_OUTPUT_SECONDS"; 361 362TEST_F(SRGBTest, GLRenderFromSRGBTexture) { 363 ASSERT_NO_FATAL_FAILURE(initShaders()); 364 365 // The RGB texture is displayed in the top half 366 ASSERT_NO_FATAL_FAILURE(drawTexture(false, 0, DISPLAY_HEIGHT / 2, 367 DISPLAY_WIDTH, DISPLAY_HEIGHT / 2)); 368 369 // The SRGB texture is displayed in the bottom half 370 ASSERT_NO_FATAL_FAILURE(drawTexture(true, 0, 0, 371 DISPLAY_WIDTH, DISPLAY_HEIGHT / 2)); 372 373 eglSwapBuffers(mEglDisplay, mEglSurface); 374 ASSERT_EQ(EGL_SUCCESS, eglGetError()); 375 376 // Lock 377 ASSERT_EQ(NO_ERROR, mCpuConsumer->lockNextBuffer(&mLockedBuffer)); 378 ASSERT_NO_FATAL_FAILURE(checkLockedBuffer(PIXEL_FORMAT_RGBA_8888)); 379 380 // Compare a pixel in the middle of each texture 381 int midSRGBOffset = (DISPLAY_HEIGHT / 4) * mLockedBuffer.stride * 382 PIXEL_SIZE; 383 int midRGBOffset = midSRGBOffset * 3; 384 midRGBOffset += (DISPLAY_WIDTH / 2) * PIXEL_SIZE; 385 midSRGBOffset += (DISPLAY_WIDTH / 2) * PIXEL_SIZE; 386 for (int c = 0; c < PIXEL_SIZE; ++c) { 387 int expectedValue = mLockedBuffer.data[midRGBOffset + c]; 388 int actualValue = mLockedBuffer.data[midSRGBOffset + c]; 389 ASSERT_PRED2(withinTolerance, expectedValue, actualValue); 390 } 391 392 // mLockedBuffer is unlocked in TearDown so we can copy data from it to 393 // the debug surface if necessary 394} 395 396TEST_F(SRGBTest, RenderToSRGBSurface) { 397 ASSERT_NO_FATAL_FAILURE(initShaders()); 398 399 // By default, the first buffer we write into will be RGB 400 401 // Render an RGB texture across the whole surface 402 ASSERT_NO_FATAL_FAILURE(drawTexture(false, 0, 0, 403 DISPLAY_WIDTH, DISPLAY_HEIGHT)); 404 eglSwapBuffers(mEglDisplay, mEglSurface); 405 ASSERT_EQ(EGL_SUCCESS, eglGetError()); 406 407 // Lock 408 ASSERT_EQ(NO_ERROR, mCpuConsumer->lockNextBuffer(&mLockedBuffer)); 409 ASSERT_NO_FATAL_FAILURE(checkLockedBuffer(PIXEL_FORMAT_RGBA_8888)); 410 411 // Save the values of the middle pixel for later comparison against SRGB 412 uint8_t values[PIXEL_SIZE] = {}; 413 int middleOffset = (DISPLAY_HEIGHT / 2) * mLockedBuffer.stride * 414 PIXEL_SIZE; 415 middleOffset += (DISPLAY_WIDTH / 2) * PIXEL_SIZE; 416 for (int c = 0; c < PIXEL_SIZE; ++c) { 417 values[c] = mLockedBuffer.data[middleOffset + c]; 418 } 419 420 // Unlock 421 ASSERT_EQ(NO_ERROR, mCpuConsumer->unlockBuffer(mLockedBuffer)); 422 423 // Switch to SRGB window surface 424#define EGL_GL_COLORSPACE_KHR EGL_VG_COLORSPACE 425#define EGL_GL_COLORSPACE_SRGB_KHR EGL_VG_COLORSPACE_sRGB 426 427 static const int srgbAttribs[] = { 428 EGL_GL_COLORSPACE_KHR, EGL_GL_COLORSPACE_SRGB_KHR, 429 EGL_NONE, 430 }; 431 432 EXPECT_TRUE(eglMakeCurrent(mEglDisplay, EGL_NO_SURFACE, EGL_NO_SURFACE, 433 mEglContext)); 434 ASSERT_EQ(EGL_SUCCESS, eglGetError()); 435 436 EXPECT_TRUE(eglDestroySurface(mEglDisplay, mEglSurface)); 437 ASSERT_EQ(EGL_SUCCESS, eglGetError()); 438 439 mEglSurface = eglCreateWindowSurface(mEglDisplay, mEglConfig, 440 mInputSurface.get(), srgbAttribs); 441 ASSERT_EQ(EGL_SUCCESS, eglGetError()); 442 ASSERT_NE(EGL_NO_SURFACE, mEglSurface); 443 444 EXPECT_TRUE(eglMakeCurrent(mEglDisplay, mEglSurface, mEglSurface, 445 mEglContext)); 446 ASSERT_EQ(EGL_SUCCESS, eglGetError()); 447 448 // Render the texture again 449 ASSERT_NO_FATAL_FAILURE(drawTexture(false, 0, 0, 450 DISPLAY_WIDTH, DISPLAY_HEIGHT)); 451 eglSwapBuffers(mEglDisplay, mEglSurface); 452 ASSERT_EQ(EGL_SUCCESS, eglGetError()); 453 454 // Lock 455 ASSERT_EQ(NO_ERROR, mCpuConsumer->lockNextBuffer(&mLockedBuffer)); 456 457 // Make sure we actually got the SRGB buffer on the consumer side 458 ASSERT_NO_FATAL_FAILURE(checkLockedBuffer(PIXEL_FORMAT_sRGB_A_8888)); 459 460 // Verify that the stored value is the same, accounting for RGB/SRGB 461 for (int c = 0; c < PIXEL_SIZE; ++c) { 462 // The alpha value should be equivalent before linear->SRGB 463 float rgbAsSRGB = (c == 3) ? values[c] / 255.0f : 464 linearToSRGB(values[c] / 255.0f); 465 int expectedValue = rgbAsSRGB * 255.0f + 0.5f; 466 int actualValue = mLockedBuffer.data[middleOffset + c]; 467 ASSERT_PRED2(withinTolerance, expectedValue, actualValue); 468 } 469 470 // mLockedBuffer is unlocked in TearDown so we can copy data from it to 471 // the debug surface if necessary 472} 473 474} // namespace android 475