qt5base-lts/examples/opengl/hellowindow/hellowindow.cpp
Samuel Rødal 528cb10d53 Made hellowindow example respect the expose event.
The expose event is sent when the window can start rendering.

Change-Id: Ifdfb01a107e3bf665fb7be65802cdaabea4c5a34
Reviewed-by: Laszlo Agocs <laszlo.p.agocs@nokia.com>
2012-04-20 08:14:22 +02:00

324 lines
9.3 KiB
C++

/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
** the names of its contributors may be used to endorse or promote
** products derived from this software without specific prior written
** permission.
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "hellowindow.h"
#include <QOpenGLContext>
#include <QTimer>
#include <qmath.h>
Renderer::Renderer(const QSurfaceFormat &format, Renderer *share, QScreen *screen)
: m_initialized(false)
, m_format(format)
{
m_context = new QOpenGLContext(this);
if (screen)
m_context->setScreen(screen);
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::WindowSystemMenuHint | Qt::WindowTitleHint | Qt::WindowMinMaxButtonsHint | Qt::WindowCloseButtonHint);
setGeometry(QRect(10, 10, 640, 480));
setFormat(renderer->format());
create();
connect(this, SIGNAL(needRender(QSurface *, const QColor &, const QSize &)),
renderer, SLOT(render(QSurface *, const QColor &, const QSize &)));
updateColor();
}
void HelloWindow::exposeEvent(QExposeEvent *event)
{
render();
QTimer *timer = new QTimer(this);
connect(timer, SIGNAL(timeout()), this, SLOT(render()));
timer->start(10);
}
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;
}