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#include <QtTest/QtTest>

#include <QtOpenGL/qgl.h>

#include <QtOpenGL/qglbuffer.h>

class tst_QGLBuffer : public QObject

{

    Q_OBJECT

public:

    tst_QGLBuffer() {}

    ~tst_QGLBuffer() {}

private slots:

    void vertexBuffer_data();

    void vertexBuffer();

    void indexBuffer_data();

    void indexBuffer();

    void bufferSharing();

private:

    void testBuffer(QGLBuffer::Type type);

};

void tst_QGLBuffer::vertexBuffer_data()

{

    QTest::addColumn<int>("usagePattern");

    QTest::newRow("StreamDraw") << int(QGLBuffer::StreamDraw);

    QTest::newRow("StaticDraw") << int(QGLBuffer::StaticDraw);

    QTest::newRow("DynamicDraw") << int(QGLBuffer::DynamicDraw);

}

void tst_QGLBuffer::vertexBuffer()

{

    testBuffer(QGLBuffer::VertexBuffer);

}

void tst_QGLBuffer::indexBuffer_data()

{

    vertexBuffer_data();

}

void tst_QGLBuffer::indexBuffer()

{

    testBuffer(QGLBuffer::IndexBuffer);

}

void tst_QGLBuffer::testBuffer(QGLBuffer::Type type)

{

    QFETCH(int, usagePattern);

    QGLWidget w;

    w.makeCurrent();

    // Create the local object, but not the buffer in the server.

    QGLBuffer buffer(type);

    QVERIFY(buffer.usagePattern() == QGLBuffer::StaticDraw);

    buffer.setUsagePattern(QGLBuffer::UsagePattern(usagePattern));

    // Check the initial state.

    QVERIFY(buffer.type() == type);

    QVERIFY(!buffer.isCreated());

    QVERIFY(buffer.bufferId() == 0);

    QVERIFY(buffer.usagePattern() == QGLBuffer::UsagePattern(usagePattern));

    QCOMPARE(buffer.size(), -1);

    // Should not be able to bind it yet because it isn't created.

    QVERIFY(!buffer.bind());

    // Create the buffer - if this fails, then assume that the

    // GL implementation does not support buffers at all.

    if (!buffer.create())

        QSKIP("Buffers are not supported on this platform", SkipAll);

    // Should now have a buffer id.

    QVERIFY(buffer.bufferId() != 0);

    // Bind the buffer and upload some data.

    QVERIFY(buffer.bind());

    static GLfloat const data[] = {1, 2, 3, 4, 5, 6, 7, 8, 9};

    buffer.allocate(data, sizeof(data));

    // Check the buffer size.

    QCOMPARE(buffer.size(), int(sizeof(data)));

    // Map the buffer and read back its contents.

    bool haveMap = false;

    GLfloat *mapped = reinterpret_cast<GLfloat *>

        (buffer.map(QGLBuffer::ReadOnly));

    if (mapped) {

        for (int index = 0; index < 9; ++index)

            QCOMPARE(mapped[index], data[index]);

        buffer.unmap();

        haveMap = true;

    } else {

        qWarning("QGLBuffer::map() is not supported on this platform");

    }

    // Read back the buffer contents using read().

    bool haveRead = false;

    GLfloat readdata[9];

    if (buffer.read(0, readdata, sizeof(readdata))) {

        for (int index = 0; index < 9; ++index)

            QCOMPARE(readdata[index], data[index]);

        haveRead = true;

    } else {

        qWarning("QGLBuffer::read() is not supported on this platform");

    }

    // Write some different data to a specific location and check it.

    static GLfloat const diffdata[] = {11, 12, 13};

    buffer.write(sizeof(GLfloat) * 3, diffdata, sizeof(diffdata));

    if (haveMap) {

        mapped = reinterpret_cast<GLfloat *>(buffer.map(QGLBuffer::ReadOnly));

        QVERIFY(mapped != 0);

        for (int index = 0; index < 9; ++index) {

            if (index >= 3 && index <= 5)

                QCOMPARE(mapped[index], diffdata[index - 3]);

            else

                QCOMPARE(mapped[index], data[index]);

        }

        buffer.unmap();

    }

    if (haveRead) {

        QVERIFY(buffer.read(0, readdata, sizeof(readdata)));

        for (int index = 0; index < 9; ++index) {

            if (index >= 3 && index <= 5)

                QCOMPARE(readdata[index], diffdata[index - 3]);

            else

                QCOMPARE(readdata[index], data[index]);

        }

    }

    // Write to the buffer using the return value from map.

    if (haveMap) {

        mapped = reinterpret_cast<GLfloat *>(buffer.map(QGLBuffer::WriteOnly));

        QVERIFY(mapped != 0);

        mapped[6] = 14;

        buffer.unmap();

        mapped = reinterpret_cast<GLfloat *>(buffer.map(QGLBuffer::ReadOnly));

        QVERIFY(mapped != 0);

        static GLfloat const diff2data[] = {11, 12, 13, 14};

        for (int index = 0; index < 9; ++index) {

            if (index >= 3 && index <= 6)

                QCOMPARE(mapped[index], diff2data[index - 3]);

            else

                QCOMPARE(mapped[index], data[index]);

        }

        buffer.unmap();

    }

    // Resize the buffer.

    buffer.allocate(sizeof(GLfloat) * 20);

    QCOMPARE(buffer.size(), int(sizeof(GLfloat) * 20));

    buffer.allocate(0, sizeof(GLfloat) * 32);

    QCOMPARE(buffer.size(), int(sizeof(GLfloat) * 32));

    // Release the buffer.

    buffer.release();

}

void tst_QGLBuffer::bufferSharing()

{

    QGLWidget *w1 = new QGLWidget();

    w1->makeCurrent();

    QGLWidget *w2 = new QGLWidget(0, w1);

    if (!w2->isSharing()) {

        delete w2;

        delete w1;

        QSKIP("Context sharing is not supported on this platform", SkipSingle);

    }

    // Bind the buffer in the first context and write some data to it.

    QGLBuffer buffer(QGLBuffer::VertexBuffer);

    if (!buffer.create())

        QSKIP("Buffers are not supported on this platform", SkipSingle);

    QVERIFY(buffer.isCreated());

    QVERIFY(buffer.bind());

    static GLfloat const data[] = {1, 2, 3, 4, 5, 6, 7, 8, 9};

    buffer.allocate(data, sizeof(data));

    QCOMPARE(buffer.size(), int(sizeof(data)));

    buffer.release();

    // Bind the buffer in the second context and read back the data.

    w2->makeCurrent();

    QVERIFY(buffer.bind());

    QCOMPARE(buffer.size(), int(sizeof(data)));

    GLfloat readdata[9];

    if (buffer.read(0, readdata, sizeof(readdata))) {

        for (int index = 0; index < 9; ++index)

            QCOMPARE(readdata[index], data[index]);

    }

    buffer.release();

    // Delete the first context.

    delete w1;

    // Make the second context current again because deleting the first

    // one will call doneCurrent() even though it wasn't current!

    w2->makeCurrent();

    // The buffer should still be valid in the second context.

    QVERIFY(buffer.bufferId() != 0);

    QVERIFY(buffer.isCreated());

    QVERIFY(buffer.bind());

    QCOMPARE(buffer.size(), int(sizeof(data)));

    buffer.release();

    // Delete the second context.

    delete w2;

    // The buffer should now be invalid.

    QVERIFY(buffer.bufferId() == 0);

    QVERIFY(!buffer.isCreated());

}

QTEST_MAIN(tst_QGLBuffer)

#include "tst_qglbuffer.moc"