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#include "glwidget.h"
#include <QPainter>
#include <QPaintEngine>
#include <math.h>
#include "bubble.h"
const int bubbleNum = 8;
GLWidget::GLWidget(QWidget *parent)
: QGLWidget(parent)
{
qtLogo = true;
frames = 0;
setAttribute(Qt::WA_PaintOnScreen);
setAttribute(Qt::WA_NoSystemBackground);
setAutoBufferSwap(false);
m_showBubbles = true;
#ifndef Q_WS_QWS
setMinimumSize(300, 250);
#endif
}
GLWidget::~GLWidget()
{
}
void GLWidget::setScaling(int scale) {
if (scale > 50)
m_fScale = 1 + qreal(scale -50) / 50 * 0.5;
else if (scale < 50)
m_fScale = 1- (qreal(50 - scale) / 50 * 1/2);
else
m_fScale = 1;
}
void GLWidget::setLogo() {
qtLogo = true;
}
void GLWidget::setTexture() {
qtLogo = false;
}
void GLWidget::showBubbles(bool bubbles)
{
m_showBubbles = bubbles;
}
void GLWidget::paintQtLogo()
{
program1.enableAttributeArray(normalAttr1);
program1.enableAttributeArray(vertexAttr1);
program1.setAttributeArray(vertexAttr1, vertices.constData());
program1.setAttributeArray(normalAttr1, normals.constData());
glDrawArrays(GL_TRIANGLES, 0, vertices.size());
program1.disableAttributeArray(normalAttr1);
program1.disableAttributeArray(vertexAttr1);
}
void GLWidget::paintTexturedCube()
{
glBindTexture(GL_TEXTURE_2D, m_uiTexture);
GLfloat afVertices[] = {
-0.5, 0.5, 0.5, 0.5,-0.5,0.5,-0.5,-0.5,0.5,
0.5, -0.5, 0.5, -0.5,0.5,0.5,0.5,0.5,0.5,
-0.5, -0.5, -0.5, 0.5,-0.5,-0.5,-0.5,0.5,-0.5,
0.5, 0.5, -0.5, -0.5,0.5,-0.5,0.5,-0.5,-0.5,
0.5, -0.5, -0.5, 0.5,-0.5,0.5,0.5,0.5,-0.5,
0.5, 0.5, 0.5, 0.5,0.5,-0.5,0.5,-0.5,0.5,
-0.5, 0.5, -0.5, -0.5,-0.5,0.5,-0.5,-0.5,-0.5,
-0.5, -0.5, 0.5, -0.5,0.5,-0.5,-0.5,0.5,0.5,
0.5, 0.5, -0.5, -0.5, 0.5, 0.5, -0.5, 0.5, -0.5,
-0.5, 0.5, 0.5, 0.5, 0.5, -0.5, 0.5, 0.5, 0.5,
-0.5, -0.5, -0.5, -0.5, -0.5, 0.5, 0.5, -0.5, -0.5,
0.5, -0.5, 0.5, 0.5, -0.5, -0.5, -0.5, -0.5, 0.5
};
program2.setAttributeArray(vertexAttr2, afVertices, 3);
GLfloat afTexCoord[] = {
0.0f,0.0f, 1.0f,1.0f, 1.0f,0.0f,
1.0f,1.0f, 0.0f,0.0f, 0.0f,1.0f,
1.0f,1.0f, 1.0f,0.0f, 0.0f,1.0f,
0.0f,0.0f, 0.0f,1.0f, 1.0f,0.0f,
1.0f,1.0f, 1.0f,0.0f, 0.0f,1.0f,
0.0f,0.0f, 0.0f,1.0f, 1.0f,0.0f,
0.0f,0.0f, 1.0f,1.0f, 1.0f,0.0f,
1.0f,1.0f, 0.0f,0.0f, 0.0f,1.0f,
0.0f,1.0f, 1.0f,0.0f, 1.0f,1.0f,
1.0f,0.0f, 0.0f,1.0f, 0.0f,0.0f,
1.0f,0.0f, 1.0f,1.0f, 0.0f,0.0f,
0.0f,1.0f, 0.0f,0.0f, 1.0f,1.0f
};
program2.setAttributeArray(texCoordAttr2, afTexCoord, 2);
GLfloat afNormals[] = {
0,0,-1, 0,0,-1, 0,0,-1,
0,0,-1, 0,0,-1, 0,0,-1,
0,0,1, 0,0,1, 0,0,1,
0,0,1, 0,0,1, 0,0,1,
-1,0,0, -1,0,0, -1,0,0,
-1,0,0, -1,0,0, -1,0,0,
1,0,0, 1,0,0, 1,0,0,
1,0,0, 1,0,0, 1,0,0,
0,-1,0, 0,-1,0, 0,-1,0,
0,-1,0, 0,-1,0, 0,-1,0,
0,1,0, 0,1,0, 0,1,0,
0,1,0, 0,1,0, 0,1,0
};
program2.setAttributeArray(normalAttr2, afNormals, 3);
program2.setUniformValue(textureUniform2, 0); // use texture unit 0
program2.enableAttributeArray(vertexAttr2);
program2.enableAttributeArray(normalAttr2);
program2.enableAttributeArray(texCoordAttr2);
glDrawArrays(GL_TRIANGLES, 0, 36);
program2.disableAttributeArray(vertexAttr2);
program2.disableAttributeArray(normalAttr2);
program2.disableAttributeArray(texCoordAttr2);
}
void GLWidget::initializeGL ()
{
glClearColor(0.1f, 0.1f, 0.2f, 1.0f);
glGenTextures(1, &m_uiTexture);
m_uiTexture = bindTexture(QImage(":/qt.png"));
QGLShader *vshader1 = new QGLShader(QGLShader::Vertex, this);
const char *vsrc1 =
"attribute highp vec4 vertex;\n"
"attribute mediump vec3 normal;\n"
"uniform mediump mat4 matrix;\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 = vec3(0.40, 1.0, 0.0);\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";
vshader1->compileSourceCode(vsrc1);
QGLShader *fshader1 = new QGLShader(QGLShader::Fragment, this);
const char *fsrc1 =
"varying mediump vec4 color;\n"
"void main(void)\n"
"{\n"
" gl_FragColor = color;\n"
"}\n";
fshader1->compileSourceCode(fsrc1);
program1.addShader(vshader1);
program1.addShader(fshader1);
program1.link();
vertexAttr1 = program1.attributeLocation("vertex");
normalAttr1 = program1.attributeLocation("normal");
matrixUniform1 = program1.uniformLocation("matrix");
QGLShader *vshader2 = new QGLShader(QGLShader::Vertex);
const char *vsrc2 =
"attribute highp vec4 vertex;\n"
"attribute highp vec4 texCoord;\n"
"attribute mediump vec3 normal;\n"
"uniform mediump mat4 matrix;\n"
"varying highp vec4 texc;\n"
"varying mediump float angle;\n"
"void main(void)\n"
"{\n"
" vec3 toLight = normalize(vec3(0.0, 0.3, 1.0));\n"
" angle = max(dot(normal, toLight), 0.0);\n"
" gl_Position = matrix * vertex;\n"
" texc = texCoord;\n"
"}\n";
vshader2->compileSourceCode(vsrc2);
QGLShader *fshader2 = new QGLShader(QGLShader::Fragment);
const char *fsrc2 =
"varying highp vec4 texc;\n"
"uniform sampler2D tex;\n"
"varying mediump float angle;\n"
"void main(void)\n"
"{\n"
" highp vec3 color = texture2D(tex, texc.st).rgb;\n"
" color = color * 0.2 + color * 0.8 * angle;\n"
" gl_FragColor = vec4(clamp(color, 0.0, 1.0), 1.0);\n"
"}\n";
fshader2->compileSourceCode(fsrc2);
program2.addShader(vshader2);
program2.addShader(fshader2);
program2.link();
vertexAttr2 = program2.attributeLocation("vertex");
normalAttr2 = program2.attributeLocation("normal");
texCoordAttr2 = program2.attributeLocation("texCoord");
matrixUniform2 = program2.uniformLocation("matrix");
textureUniform2 = program2.uniformLocation("tex");
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR );
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
m_fAngle = 0;
m_fScale = 1;
createGeometry();
createBubbles(bubbleNum - bubbles.count());
}
void GLWidget::paintGL()
{
createBubbles(bubbleNum - bubbles.count());
QPainter painter;
painter.begin(this);
painter.beginNativePainting();
glClearColor(0.1f, 0.1f, 0.2f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR );
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
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.scale(m_fScale);
modelview.translate(0.0f, -0.2f, 0.0f);
if (qtLogo) {
program1.bind();
program1.setUniformValue(matrixUniform1, modelview);
paintQtLogo();
program1.release();
} else {
program2.bind();
program1.setUniformValue(matrixUniform2, modelview);
paintTexturedCube();
program2.release();
}
glDisable(GL_DEPTH_TEST);
glDisable(GL_CULL_FACE);
painter.endNativePainting();
if (m_showBubbles)
foreach (Bubble *bubble, bubbles) {
bubble->drawBubble(&painter);
}
QString framesPerSecond;
framesPerSecond.setNum(frames /(time.elapsed() / 1000.0), 'f', 2);
painter.setPen(Qt::white);
painter.drawText(20, 40, framesPerSecond + " fps");
painter.end();
swapBuffers();
QMutableListIterator<Bubble*> iter(bubbles);
while (iter.hasNext()) {
Bubble *bubble = iter.next();
bubble->move(rect());
}
if (!(frames % 100)) {
time.start();
frames = 0;
}
m_fAngle += 1.0f;
frames ++;
}
void GLWidget::createBubbles(int number)
{
for (int i = 0; i < number; ++i) {
QPointF position(width()*(0.1 + (0.8*qrand()/(RAND_MAX+1.0))),
height()*(0.1 + (0.8*qrand()/(RAND_MAX+1.0))));
qreal radius = qMin(width(), height())*(0.0175 + 0.0875*qrand()/(RAND_MAX+1.0));
QPointF velocity(width()*0.0175*(-0.5 + qrand()/(RAND_MAX+1.0)),
height()*0.0175*(-0.5 + qrand()/(RAND_MAX+1.0)));
bubbles.append(new Bubble(position, radius, velocity));
}
}
void GLWidget::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 * sin(angle1);
qreal y5 = 0.30 * cos(angle1);
qreal x6 = 0.20 * sin(angle1);
qreal y6 = 0.20 * cos(angle1);
qreal angle2 = ((i + 1) * 2 * Pi) / NumSectors;
qreal x7 = 0.20 * sin(angle2);
qreal y7 = 0.20 * cos(angle2);
qreal x8 = 0.30 * sin(angle2);
qreal y8 = 0.30 * cos(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 GLWidget::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 GLWidget::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;
}