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// 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);
}
}
}
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