// Copyright (c) 2010 The Chromium OS Authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. #include <memory> #include "base/logging.h" #include "main.h" #include "testbase.h" namespace glbench { class ReadPixelTest : public TestBase { public: ReadPixelTest() : pixels_(NULL) {} virtual ~ReadPixelTest() {} virtual bool TestFunc(uint64_t iterations); virtual bool Run(); virtual const char* Name() const { return "pixel_read"; } virtual bool IsDrawTest() const { return false; } virtual const char* Unit() const { return "mpixels_sec"; } private: void* pixels_; DISALLOW_COPY_AND_ASSIGN(ReadPixelTest); }; bool ReadPixelTest::TestFunc(uint64_t iterations) { glReadPixels(0, 0, g_width, g_height, GL_RGBA, GL_UNSIGNED_BYTE, pixels_); CHECK(glGetError() == 0); for (uint64_t i = 0; i < iterations - 1; i++) glReadPixels(0, 0, g_width, g_height, GL_RGBA, GL_UNSIGNED_BYTE, pixels_); return true; } bool ReadPixelTest::Run() { // One GL_RGBA pixel takes 4 bytes. const int row_size = g_width * 4; // Default GL_PACK_ALIGNMENT is 4, round up pixel row size to multiple of 4. // This is a no-op because row_size is already divisible by 4. // One is added so that we can test reads into unaligned location. std::unique_ptr<char[]> buf(new char[((row_size + 3) & ~3) * g_height + 1]); pixels_ = buf.get(); RunTest(this, "pixel_read", g_width * g_height, g_width, g_height, true); // Reducing GL_PACK_ALIGNMENT can only make rows smaller. No need to // reallocate the buffer. glPixelStorei(GL_PACK_ALIGNMENT, 1); RunTest(this, "pixel_read_2", g_width * g_height, g_width, g_height, true); pixels_ = static_cast<void*>(buf.get() + 1); RunTest(this, "pixel_read_3", g_width * g_height, g_width, g_height, true); return true; } TestBase* GetReadPixelTest() { return new ReadPixelTest; } } // namespace glbench