1 files changed, 276 insertions, 0 deletions
diff --git a/examples/opengl/hellowindow/hellowindow.cpp b/examples/opengl/hellowindow/hellowindow.cpp
new file mode 100644
index 0000000000..10d9d346a6
--- /dev/null
+++ b/examples/opengl/hellowindow/hellowindow.cpp
@@ -0,0 +1,276 @@
+#include "hellowindow.h"
+
+#include <QOpenGLContext>
+
+#include <QTimer>
+
+#include <qmath.h>
+
+Renderer::Renderer(const QSurfaceFormat &format, Renderer *share)
+    : m_initialized(false)
+    , m_format(format)
+{
+    m_context = new QOpenGLContext(this);
+    m_context->setFormat(format);
+    if (share)
+        m_context->setShareContext(share->m_context);
+    m_context->create();
+}
+
+HelloWindow::HelloWindow(Renderer *renderer)
+    : m_colorIndex(0)
+    , m_renderer(renderer)
+{
+    setSurfaceType(QWindow::OpenGLSurface);
+    setWindowFlags(Qt::Window | Qt::WindowTitleHint | Qt::WindowMinMaxButtonsHint | Qt::WindowCloseButtonHint);
+
+    setGeometry(QRect(10, 10, 640, 480));
+
+    setFormat(renderer->format());
+
+    create();
+
+    QTimer *timer = new QTimer(this);
+    connect(timer, SIGNAL(timeout()), this, SLOT(render()));
+    timer->start(10);
+
+    connect(this, SIGNAL(needRender(QSurface *, const QColor &, const QSize &)),
+            renderer, SLOT(render(QSurface *, const QColor &, const QSize &)));
+
+    updateColor();
+}
+
+void HelloWindow::mousePressEvent(QMouseEvent *)
+{
+    updateColor();
+}
+
+void HelloWindow::render()
+{
+    emit needRender(this, m_color, size());
+}
+
+void HelloWindow::updateColor()
+{
+    QColor colors[] =
+    {
+        QColor(100, 255, 0),
+        QColor(0, 100, 255)
+    };
+
+    m_color = colors[m_colorIndex];
+
+    m_colorIndex++;
+    if (m_colorIndex >= int(sizeof(colors) / sizeof(colors[0])))
+        m_colorIndex = 0;
+}
+
+void Renderer::render(QSurface *surface, const QColor &color, const QSize &viewSize)
+{
+    if (!m_context->makeCurrent(surface))
+        return;
+
+    if (!m_initialized) {
+        initialize();
+        m_initialized = true;
+    }
+
+    glViewport(0, 0, viewSize.width(), viewSize.height());
+
+    glClearColor(0.1f, 0.1f, 0.2f, 1.0f);
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+    glFrontFace(GL_CW);
+    glCullFace(GL_FRONT);
+    glEnable(GL_CULL_FACE);
+    glEnable(GL_DEPTH_TEST);
+
+    QMatrix4x4 modelview;
+    modelview.rotate(m_fAngle, 0.0f, 1.0f, 0.0f);
+    modelview.rotate(m_fAngle, 1.0f, 0.0f, 0.0f);
+    modelview.rotate(m_fAngle, 0.0f, 0.0f, 1.0f);
+    modelview.translate(0.0f, -0.2f, 0.0f);
+
+    m_program->bind();
+    m_program->setUniformValue(matrixUniform, modelview);
+    m_program->setUniformValue(colorUniform, color);
+    paintQtLogo();
+    m_program->release();
+
+    glDisable(GL_DEPTH_TEST);
+    glDisable(GL_CULL_FACE);
+
+    m_context->swapBuffers(surface);
+
+    m_fAngle += 1.0f;
+}
+
+void Renderer::paintQtLogo()
+{
+    m_program->enableAttributeArray(normalAttr);
+    m_program->enableAttributeArray(vertexAttr);
+    m_program->setAttributeArray(vertexAttr, vertices.constData());
+    m_program->setAttributeArray(normalAttr, normals.constData());
+    glDrawArrays(GL_TRIANGLES, 0, vertices.size());
+    m_program->disableAttributeArray(normalAttr);
+    m_program->disableAttributeArray(vertexAttr);
+}
+
+void Renderer::initialize()
+{
+    glClearColor(0.1f, 0.1f, 0.2f, 1.0f);
+
+    QOpenGLShader *vshader = new QOpenGLShader(QOpenGLShader::Vertex, this);
+    const char *vsrc =
+        "attribute highp vec4 vertex;\n"
+        "attribute mediump vec3 normal;\n"
+        "uniform mediump mat4 matrix;\n"
+        "uniform lowp vec4 sourceColor;\n"
+        "varying mediump vec4 color;\n"
+        "void main(void)\n"
+        "{\n"
+        "    vec3 toLight = normalize(vec3(0.0, 0.3, 1.0));\n"
+        "    float angle = max(dot(normal, toLight), 0.0);\n"
+        "    vec3 col = sourceColor.rgb;\n"
+        "    color = vec4(col * 0.2 + col * 0.8 * angle, 1.0);\n"
+        "    color = clamp(color, 0.0, 1.0);\n"
+        "    gl_Position = matrix * vertex;\n"
+        "}\n";
+    vshader->compileSourceCode(vsrc);
+
+    QOpenGLShader *fshader = new QOpenGLShader(QOpenGLShader::Fragment, this);
+    const char *fsrc =
+        "varying mediump vec4 color;\n"
+        "void main(void)\n"
+        "{\n"
+        "    gl_FragColor = color;\n"
+        "}\n";
+    fshader->compileSourceCode(fsrc);
+
+    m_program = new QOpenGLShaderProgram;
+    m_program->addShader(vshader);
+    m_program->addShader(fshader);
+    m_program->link();
+
+    vertexAttr = m_program->attributeLocation("vertex");
+    normalAttr = m_program->attributeLocation("normal");
+    matrixUniform = m_program->uniformLocation("matrix");
+    colorUniform = m_program->uniformLocation("sourceColor");
+
+    m_fAngle = 0;
+    createGeometry();
+}
+
+void Renderer::createGeometry()
+{
+    vertices.clear();
+    normals.clear();
+
+    qreal x1 = +0.06f;
+    qreal y1 = -0.14f;
+    qreal x2 = +0.14f;
+    qreal y2 = -0.06f;
+    qreal x3 = +0.08f;
+    qreal y3 = +0.00f;
+    qreal x4 = +0.30f;
+    qreal y4 = +0.22f;
+
+    quad(x1, y1, x2, y2, y2, x2, y1, x1);
+    quad(x3, y3, x4, y4, y4, x4, y3, x3);
+
+    extrude(x1, y1, x2, y2);
+    extrude(x2, y2, y2, x2);
+    extrude(y2, x2, y1, x1);
+    extrude(y1, x1, x1, y1);
+    extrude(x3, y3, x4, y4);
+    extrude(x4, y4, y4, x4);
+    extrude(y4, x4, y3, x3);
+
+    const qreal Pi = 3.14159f;
+    const int NumSectors = 100;
+
+    for (int i = 0; i < NumSectors; ++i) {
+        qreal angle1 = (i * 2 * Pi) / NumSectors;
+        qreal x5 = 0.30 * qSin(angle1);
+        qreal y5 = 0.30 * qCos(angle1);
+        qreal x6 = 0.20 * qSin(angle1);
+        qreal y6 = 0.20 * qCos(angle1);
+
+        qreal angle2 = ((i + 1) * 2 * Pi) / NumSectors;
+        qreal x7 = 0.20 * qSin(angle2);
+        qreal y7 = 0.20 * qCos(angle2);
+        qreal x8 = 0.30 * qSin(angle2);
+        qreal y8 = 0.30 * qCos(angle2);
+
+        quad(x5, y5, x6, y6, x7, y7, x8, y8);
+
+        extrude(x6, y6, x7, y7);
+        extrude(x8, y8, x5, y5);
+    }
+
+    for (int i = 0;i < vertices.size();i++)
+        vertices[i] *= 2.0f;
+}
+
+void Renderer::quad(qreal x1, qreal y1, qreal x2, qreal y2, qreal x3, qreal y3, qreal x4, qreal y4)
+{
+    vertices << QVector3D(x1, y1, -0.05f);
+    vertices << QVector3D(x2, y2, -0.05f);
+    vertices << QVector3D(x4, y4, -0.05f);
+
+    vertices << QVector3D(x3, y3, -0.05f);
+    vertices << QVector3D(x4, y4, -0.05f);
+    vertices << QVector3D(x2, y2, -0.05f);
+
+    QVector3D n = QVector3D::normal
+        (QVector3D(x2 - x1, y2 - y1, 0.0f), QVector3D(x4 - x1, y4 - y1, 0.0f));
+
+    normals << n;
+    normals << n;
+    normals << n;
+
+    normals << n;
+    normals << n;
+    normals << n;
+
+    vertices << QVector3D(x4, y4, 0.05f);
+    vertices << QVector3D(x2, y2, 0.05f);
+    vertices << QVector3D(x1, y1, 0.05f);
+
+    vertices << QVector3D(x2, y2, 0.05f);
+    vertices << QVector3D(x4, y4, 0.05f);
+    vertices << QVector3D(x3, y3, 0.05f);
+
+    n = QVector3D::normal
+        (QVector3D(x2 - x4, y2 - y4, 0.0f), QVector3D(x1 - x4, y1 - y4, 0.0f));
+
+    normals << n;
+    normals << n;
+    normals << n;
+
+    normals << n;
+    normals << n;
+    normals << n;
+}
+
+void Renderer::extrude(qreal x1, qreal y1, qreal x2, qreal y2)
+{
+    vertices << QVector3D(x1, y1, +0.05f);
+    vertices << QVector3D(x2, y2, +0.05f);
+    vertices << QVector3D(x1, y1, -0.05f);
+
+    vertices << QVector3D(x2, y2, -0.05f);
+    vertices << QVector3D(x1, y1, -0.05f);
+    vertices << QVector3D(x2, y2, +0.05f);
+
+    QVector3D n = QVector3D::normal
+        (QVector3D(x2 - x1, y2 - y1, 0.0f), QVector3D(0.0f, 0.0f, -0.1f));
+
+    normals << n;
+    normals << n;
+    normals << n;
+
+    normals << n;
+    normals << n;
+    normals << n;
+}