1 // Copyright (c) 2010 The Chromium OS Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #include "base/logging.h" 6 #include "base/memory/scoped_ptr.h" 7 8 #include "main.h" 9 #include "testbase.h" 10 11 12 namespace glbench { 13 14 15 class ReadPixelTest : public TestBase { 16 public: 17 ReadPixelTest() : pixels_(NULL) {} 18 virtual ~ReadPixelTest() {} 19 virtual bool TestFunc(uint64_t iterations); 20 virtual bool Run(); 21 virtual const char* Name() const { return "pixel_read"; } 22 virtual bool IsDrawTest() const { return false; } 23 virtual const char* Unit() const { return "mpixels_sec"; } 24 25 private: 26 void* pixels_; 27 DISALLOW_COPY_AND_ASSIGN(ReadPixelTest); 28 }; 29 30 31 bool ReadPixelTest::TestFunc(uint64_t iterations) { 32 glReadPixels(0, 0, g_width, g_height, GL_RGBA, GL_UNSIGNED_BYTE, pixels_); 33 CHECK(glGetError() == 0); 34 for (uint64_t i = 0; i < iterations - 1; i++) 35 glReadPixels(0, 0, g_width, g_height, GL_RGBA, GL_UNSIGNED_BYTE, pixels_); 36 return true; 37 } 38 39 40 bool ReadPixelTest::Run() { 41 // One GL_RGBA pixel takes 4 bytes. 42 const int row_size = g_width * 4; 43 // Default GL_PACK_ALIGNMENT is 4, round up pixel row size to multiple of 4. 44 // This is a no-op because row_size is already divisible by 4. 45 // One is added so that we can test reads into unaligned location. 46 scoped_ptr<char[]> buf(new char[((row_size + 3) & ~3) * g_height + 1]); 47 pixels_ = buf.get(); 48 RunTest(this, "pixel_read", g_width * g_height, g_width, g_height, true); 49 50 // Reducing GL_PACK_ALIGNMENT can only make rows smaller. No need to 51 // reallocate the buffer. 52 glPixelStorei(GL_PACK_ALIGNMENT, 1); 53 RunTest(this, "pixel_read_2", g_width * g_height, g_width, g_height, true); 54 55 pixels_ = static_cast<void*>(buf.get() + 1); 56 RunTest(this, "pixel_read_3", g_width * g_height, g_width, g_height, true); 57 58 return true; 59 } 60 61 62 TestBase* GetReadPixelTest() { 63 return new ReadPixelTest; 64 } 65 66 67 } // namespace glbench 68
