1 files changed, 167 insertions, 0 deletions
diff --git a/tests/manual/examples/opengl/qopenglwindow/background_renderer.cpp b/tests/manual/examples/opengl/qopenglwindow/background_renderer.cpp
new file mode 100644
index 0000000000..5939894dfe
--- /dev/null
+++ b/tests/manual/examples/opengl/qopenglwindow/background_renderer.cpp
@@ -0,0 +1,167 @@
+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#include "background_renderer.h"
+
+#include <qmath.h>
+#include <QFileInfo>
+#include <QTime>
+
+#include <QOpenGLShaderProgram>
+#include <QOpenGLContext>
+#include <QOpenGLFunctions>
+
+#include <math.h>
+
+static const char vertex_shader[] =
+    "attribute highp vec3 vertexCoord;"
+    "void main() {"
+    "   gl_Position = vec4(vertexCoord,1.0);"
+    "}";
+
+static const char fragment_shader[] =
+    "void main() {"
+    "   gl_FragColor = vec4(0.0,1.0,0.0,1.0);"
+    "}";
+
+static const float vertices[] = { -1, -1, 0,
+                                  -1,  1, 0,
+                                  1, -1, 0,
+                                  1,  1, 0 };
+
+FragmentToy::FragmentToy(const QString &fragmentSource, QObject *parent)
+    : QObject(parent)
+    , m_recompile_shaders(true)
+{
+    if (QFile::exists(fragmentSource)) {
+        QFileInfo info(fragmentSource);
+        m_fragment_file_last_modified = info.lastModified();
+        m_fragment_file = fragmentSource;
+#if QT_CONFIG(filesystemwatcher)
+        m_watcher.addPath(info.canonicalPath());
+        QObject::connect(&m_watcher, &QFileSystemWatcher::directoryChanged, this, &FragmentToy::fileChanged);
+#endif
+    }
+}
+
+FragmentToy::~FragmentToy()
+    = default;
+
+void FragmentToy::draw(const QSize &windowSize)
+{
+    if (!m_program)
+        initializeOpenGLFunctions();
+
+    glDisable(GL_STENCIL_TEST);
+    glDisable(GL_DEPTH_TEST);
+
+    glClearColor(0, 0, 0, 1);
+    glClear(GL_COLOR_BUFFER_BIT);
+    if (!m_vao.isCreated())
+        m_vao.create();
+
+    QOpenGLVertexArrayObject::Binder binder(&m_vao);
+
+    if (!m_vertex_buffer.isCreated()) {
+        m_vertex_buffer.create();
+        m_vertex_buffer.bind();
+        m_vertex_buffer.allocate(vertices, sizeof(vertices));
+        m_vertex_buffer.release();
+    }
+
+    if (!m_program) {
+        m_program.reset(new QOpenGLShaderProgram);
+        m_program->create();
+        m_vertex_shader.reset(new QOpenGLShader(QOpenGLShader::Vertex));
+        if (!m_vertex_shader->compileSourceCode(vertex_shader)) {
+            qWarning() << "Failed to compile the vertex shader:" << m_vertex_shader->log();
+        }
+        if (!m_program->addShader(m_vertex_shader.get())) {
+            qWarning() << "Failed to add vertex shader to program:" << m_program->log();
+        }
+    }
+
+    if (!m_fragment_shader && m_recompile_shaders) {
+        QByteArray data;
+        if (m_fragment_file.size()) {
+            QFile file(m_fragment_file);
+            if (file.open(QIODevice::ReadOnly)) {
+                data = file.readAll();
+            } else {
+                qWarning() << "Failed to load input file, falling back to default";
+                data = QByteArray::fromRawData(fragment_shader, sizeof(fragment_shader));
+            }
+        } else {
+            QFile qrcFile(":/background.frag");
+            if (qrcFile.open(QIODevice::ReadOnly))
+                data = qrcFile.readAll();
+            else
+                data = QByteArray::fromRawData(fragment_shader, sizeof(fragment_shader));
+        }
+        if (data.size()) {
+            m_fragment_shader.reset(new QOpenGLShader(QOpenGLShader::Fragment));
+            if (!m_fragment_shader->compileSourceCode(data)) {
+                qWarning() << "Failed to compile fragment shader:" << m_fragment_shader->log();
+                m_fragment_shader.reset(nullptr);
+            }
+        } else {
+            qWarning() << "Unknown error, no fragment shader";
+        }
+
+        if (m_fragment_shader) {
+            if (!m_program->addShader(m_fragment_shader.get())) {
+                qWarning() << "Failed to add fragment shader to program:" << m_program->log();
+            }
+        }
+    }
+
+    if (m_recompile_shaders) {
+        m_recompile_shaders = false;
+
+        if (m_program->link()) {
+            m_vertex_coord_pos = m_program->attributeLocation("vertexCoord");
+        } else {
+            qWarning() << "Failed to link shader program" << m_program->log();
+        }
+
+    }
+
+    if (!m_program->isLinked())
+        return;
+
+    m_program->bind();
+
+    m_vertex_buffer.bind();
+    m_program->setAttributeBuffer("vertexCoord", GL_FLOAT, 0, 3, 0);
+    m_program->enableAttributeArray("vertexCoord");
+    m_vertex_buffer.release();
+
+    m_program->setUniformValue("currentTime", (uint) QDateTime::currentMSecsSinceEpoch());
+    m_program->setUniformValue("windowSize", windowSize);
+
+    QOpenGLContext::currentContext()->functions()->glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
+
+    m_program->release();
+}
+
+void FragmentToy::fileChanged(const QString &path)
+{
+    Q_UNUSED(path);
+    if (QFile::exists(m_fragment_file)) {
+        QFileInfo fragment_source(m_fragment_file);
+        if (fragment_source.lastModified() > m_fragment_file_last_modified) {
+            m_fragment_file_last_modified = fragment_source.lastModified();
+            m_recompile_shaders = true;
+            if (m_program) {
+                m_program->removeShader(m_fragment_shader.get());
+                m_fragment_shader.reset(nullptr);
+            }
+        }
+    } else {
+        m_recompile_shaders = true;
+        if (m_program) {
+            m_program->removeShader(m_fragment_shader.get());
+            m_fragment_shader.reset(nullptr);
+        }
+    }
+}