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// Copyright (c) 2012 The Chromium 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 <GLES2/gl2.h>
#include <GLES2/gl2ext.h>
#include <GLES2/gl2extchromium.h>
#include "base/bind.h"
#include "base/message_loop/message_loop.h"
#include "base/run_loop.h"
#include "gpu/command_buffer/tests/gl_manager.h"
#include "gpu/command_buffer/tests/gl_test_utils.h"
#include "testing/gmock/include/gmock/gmock.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace gpu {
class GLReadbackTest : public testing::Test {
protected:
virtual void SetUp() {
gl_.Initialize(GLManager::Options());
}
virtual void TearDown() {
gl_.Destroy();
}
static void WaitForQueryCallback(int q, base::Closure cb) {
unsigned int done = 0;
glGetQueryObjectuivEXT(q, GL_QUERY_RESULT_AVAILABLE_EXT, &done);
if (done) {
cb.Run();
} else {
base::MessageLoop::current()->PostDelayedTask(
FROM_HERE,
base::Bind(&WaitForQueryCallback, q, cb),
base::TimeDelta::FromMilliseconds(3));
}
}
void WaitForQuery(int q) {
base::RunLoop run_loop;
WaitForQueryCallback(q, run_loop.QuitClosure());
run_loop.Run();
}
GLManager gl_;
};
TEST_F(GLReadbackTest, ReadPixelsWithPBOAndQuery) {
const GLint kBytesPerPixel = 4;
const GLint kWidth = 2;
const GLint kHeight = 2;
GLuint b, q;
glClearColor(0.0, 0.0, 1.0, 1.0);
glClear(GL_COLOR_BUFFER_BIT);
glGenBuffers(1, &b);
glGenQueriesEXT(1, &q);
glBindBuffer(GL_PIXEL_PACK_TRANSFER_BUFFER_CHROMIUM, b);
glBufferData(GL_PIXEL_PACK_TRANSFER_BUFFER_CHROMIUM,
kWidth * kHeight * kBytesPerPixel,
NULL,
GL_STREAM_READ);
glBeginQueryEXT(GL_ASYNC_PIXEL_PACK_COMPLETED_CHROMIUM, q);
glReadPixels(0, 0, kWidth, kHeight, GL_RGBA, GL_UNSIGNED_BYTE, 0);
glEndQueryEXT(GL_ASYNC_PIXEL_PACK_COMPLETED_CHROMIUM);
glFlush();
WaitForQuery(q);
// TODO(hubbe): Check that glMapBufferCHROMIUM does not block here.
unsigned char *data = static_cast<unsigned char *>(
glMapBufferCHROMIUM(
GL_PIXEL_PACK_TRANSFER_BUFFER_CHROMIUM,
GL_READ_ONLY));
EXPECT_TRUE(data);
EXPECT_EQ(data[0], 0); // red
EXPECT_EQ(data[1], 0); // green
EXPECT_EQ(data[2], 255); // blue
glUnmapBufferCHROMIUM(GL_PIXEL_PACK_TRANSFER_BUFFER_CHROMIUM);
glBindBuffer(GL_PIXEL_PACK_TRANSFER_BUFFER_CHROMIUM, 0);
glDeleteBuffers(1, &b);
glDeleteQueriesEXT(1, &q);
GLTestHelper::CheckGLError("no errors", __LINE__);
}
} // namespace gpu
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