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
13namespace glbench {
14
15
16class 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
32bool 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
41bool 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
63TestBase* GetReadPixelTest() {
64  return new ReadPixelTest;
65}
66
67
68} // namespace glbench
69