blob: c5d7a6326fd923310f091b370b61d5feebd68559 [file] [log] [blame]
// 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 "main.h"
#include "testbase.h"
#include "utils.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; 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