1 files changed, 191 insertions, 0 deletions
diff --git a/tests/manual/examples/opengl/contextinfo/renderwindow.cpp b/tests/manual/examples/opengl/contextinfo/renderwindow.cpp
new file mode 100644
index 0000000000..64c0f47db9
--- /dev/null
+++ b/tests/manual/examples/opengl/contextinfo/renderwindow.cpp
@@ -0,0 +1,191 @@
+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#include "renderwindow.h"
+#include <QTimer>
+#include <QMatrix4x4>
+#include <QOpenGLContext>
+#include <QtOpenGL/QOpenGLShaderProgram>
+#include <QOpenGLFunctions>
+
+RenderWindow::RenderWindow(const QSurfaceFormat &format)
+    : m_context(nullptr),
+      m_initialized(false),
+      m_forceGLSL110(false),
+      m_angle(0.0f)
+{
+    setSurfaceType(QWindow::OpenGLSurface);
+    setFormat(format);
+    m_context = new QOpenGLContext(this);
+    m_context->setFormat(requestedFormat());
+    if (!m_context->create()) {
+        delete m_context;
+        m_context = nullptr;
+    }
+}
+
+void RenderWindow::exposeEvent(QExposeEvent *)
+{
+    if (isExposed())
+        render();
+}
+
+// ES needs the precision qualifiers.
+// On desktop GL QOpenGLShaderProgram inserts dummy defines for highp/mediump/lowp.
+static const char *vertexShaderSource110 =
+    "attribute highp vec4 posAttr;\n"
+    "attribute lowp vec4 colAttr;\n"
+    "varying lowp vec4 col;\n"
+    "uniform highp mat4 matrix;\n"
+    "void main() {\n"
+    "   col = colAttr;\n"
+    "   gl_Position = matrix * posAttr;\n"
+    "}\n";
+
+static const char *fragmentShaderSource110 =
+    "varying lowp vec4 col;\n"
+    "void main() {\n"
+    "   gl_FragColor = col;\n"
+    "}\n";
+
+static const char *vertexShaderSource =
+    "#version 150\n"
+    "in vec4 posAttr;\n"
+    "in vec4 colAttr;\n"
+    "out vec4 col;\n"
+    "uniform mat4 matrix;\n"
+    "void main() {\n"
+    "   col = colAttr;\n"
+    "   gl_Position = matrix * posAttr;\n"
+    "}\n";
+
+static const char *fragmentShaderSource =
+    "#version 150\n"
+    "in vec4 col;\n"
+    "out vec4 fragColor;\n"
+    "void main() {\n"
+    "   fragColor = col;\n"
+    "}\n";
+
+static GLfloat vertices[] = {
+    0.0f, 0.707f,
+    -0.5f, -0.5f,
+    0.5f, -0.5f
+};
+
+static GLfloat colors[] = {
+    1.0f, 0.0f, 0.0f,
+    0.0f, 1.0f, 0.0f,
+    0.0f, 0.0f, 1.0f
+};
+
+void RenderWindow::init()
+{
+    m_program = new QOpenGLShaderProgram(this);
+
+    QSurfaceFormat format = m_context->format();
+    bool useNewStyleShader = format.profile() == QSurfaceFormat::CoreProfile;
+    // Try to handle 3.0 & 3.1 that do not have the core/compatibility profile concept 3.2+ has.
+    // This may still fail since version 150 (3.2) is specified in the sources but it's worth a try.
+    if (format.renderableType() == QSurfaceFormat::OpenGL && format.majorVersion() == 3 && format.minorVersion() <= 1)
+        useNewStyleShader = !format.testOption(QSurfaceFormat::DeprecatedFunctions);
+    if (m_forceGLSL110)
+        useNewStyleShader = false;
+
+    const char *vsrc = useNewStyleShader ? vertexShaderSource : vertexShaderSource110;
+    const char *fsrc = useNewStyleShader ? fragmentShaderSource : fragmentShaderSource110;
+    qDebug("Using version %s shader", useNewStyleShader ? "150" : "110");
+
+    if (!m_program->addShaderFromSourceCode(QOpenGLShader::Vertex, vsrc)) {
+        emit error(m_program->log());
+        return;
+    }
+    if (!m_program->addShaderFromSourceCode(QOpenGLShader::Fragment, fsrc)) {
+        emit error(m_program->log());
+        return;
+    }
+    if (!m_program->link()) {
+        emit error(m_program->log());
+        return;
+    }
+
+    m_posAttr = m_program->attributeLocation("posAttr");
+    m_colAttr = m_program->attributeLocation("colAttr");
+    m_matrixUniform = m_program->uniformLocation("matrix");
+
+    m_vbo.create();
+    m_vbo.bind();
+    m_vbo.allocate(vertices, sizeof(vertices) + sizeof(colors));
+    m_vbo.write(sizeof(vertices), colors, sizeof(colors));
+    m_vbo.release();
+
+    QOpenGLVertexArrayObject::Binder vaoBinder(&m_vao);
+    if (m_vao.isCreated()) // have VAO support, use it
+        setupVertexAttribs();
+}
+
+void RenderWindow::setupVertexAttribs()
+{
+    m_vbo.bind();
+    m_program->setAttributeBuffer(m_posAttr, GL_FLOAT, 0, 2);
+    m_program->setAttributeBuffer(m_colAttr, GL_FLOAT, sizeof(vertices), 3);
+    m_program->enableAttributeArray(m_posAttr);
+    m_program->enableAttributeArray(m_colAttr);
+    m_vbo.release();
+}
+
+bool RenderWindow::event(QEvent *ev)
+{
+    if (ev->type() == QEvent::UpdateRequest)
+        render();
+    return QWindow::event(ev);
+}
+
+void RenderWindow::render()
+{
+    if (!m_context->makeCurrent(this)) {
+        emit error(tr("makeCurrent() failed"));
+        return;
+    }
+
+    QOpenGLFunctions *f = m_context->functions();
+    if (!m_initialized) {
+        m_initialized = true;
+        f->glEnable(GL_DEPTH_TEST);
+        f->glClearColor(0, 0, 0, 1);
+        init();
+        emit ready();
+    }
+
+    if (!m_vbo.isCreated()) // init() failed, don't bother with trying to render
+        return;
+
+    const qreal retinaScale = devicePixelRatio();
+    f->glViewport(0, 0, width() * retinaScale, height() * retinaScale);
+    f->glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+    m_program->bind();
+    QMatrix4x4 matrix;
+    matrix.perspective(60.0f, 4.0f / 3.0f, 0.1f, 100.0f);
+    matrix.translate(0.0f, 0.0f, -2.0f);
+    matrix.rotate(m_angle, 0.0f, 1.0f, 0.0f);
+    m_program->setUniformValue(m_matrixUniform, matrix);
+
+    if (m_vao.isCreated())
+        m_vao.bind();
+    else // no VAO support, set the vertex attribute arrays now
+        setupVertexAttribs();
+
+    f->glDrawArrays(GL_TRIANGLES, 0, 3);
+
+    m_vao.release();
+    m_program->release();
+
+    // swapInterval is 1 by default which means that swapBuffers() will (hopefully) block
+    // and wait for vsync.
+    m_context->swapBuffers(this);
+
+    m_angle += 1.0f;
+
+    requestUpdate();
+}