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| ** Copyright (C) 2016 The Qt Company Ltd. |
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| ** This file is part of the examples of the Qt Toolkit. |
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| ****************************************************************************/ |
| |
| #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); |
| } |
| } |
| } |