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 <memory> 6 7 #include "base/logging.h" 8 9 #include "main.h" 10 #include "testbase.h" 11 12 13 namespace glbench { 14 15 16 class ReadPixelTest : public TestBase { 17 public: 18 ReadPixelTest() : pixels_(NULL) {} 19 virtual ~ReadPixelTest() {} 20 virtual bool TestFunc(uint64_t iterations); 21 virtual bool Run(); 22 virtual const char* Name() const { return "pixel_read"; } 23 virtual bool IsDrawTest() const { return false; } 24 virtual const char* Unit() const { return "mpixels_sec"; } 25 26 private: 27 void* pixels_; 28 DISALLOW_COPY_AND_ASSIGN(ReadPixelTest); 29 }; 30 31 32 bool ReadPixelTest::TestFunc(uint64_t iterations) { 33 glReadPixels(0, 0, g_width, g_height, GL_RGBA, GL_UNSIGNED_BYTE, pixels_); 34 CHECK(glGetError() == 0); 35 for (uint64_t i = 0; i < iterations - 1; i++) 36 glReadPixels(0, 0, g_width, g_height, GL_RGBA, GL_UNSIGNED_BYTE, pixels_); 37 return true; 38 } 39 40 41 bool ReadPixelTest::Run() { 42 // One GL_RGBA pixel takes 4 bytes. 43 const int row_size = g_width * 4; 44 // Default GL_PACK_ALIGNMENT is 4, round up pixel row size to multiple of 4. 45 // This is a no-op because row_size is already divisible by 4. 46 // One is added so that we can test reads into unaligned location. 47 std::unique_ptr<char[]> buf(new char[((row_size + 3) & ~3) * g_height + 1]); 48 pixels_ = buf.get(); 49 RunTest(this, "pixel_read", g_width * g_height, g_width, g_height, true); 50 51 // Reducing GL_PACK_ALIGNMENT can only make rows smaller. No need to 52 // reallocate the buffer. 53 glPixelStorei(GL_PACK_ALIGNMENT, 1); 54 RunTest(this, "pixel_read_2", g_width * g_height, g_width, g_height, true); 55 56 pixels_ = static_cast<void*>(buf.get() + 1); 57 RunTest(this, "pixel_read_3", g_width * g_height, g_width, g_height, true); 58 59 return true; 60 } 61 62 63 TestBase* GetReadPixelTest() { 64 return new ReadPixelTest; 65 } 66 67 68 } // namespace glbench 69
