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/********************************************************************************
* FaceTrackNoIR This program is a private project of the some enthusiastic *
* gamers from Holland, who don't like to pay much for *
* head-tracking. *
* *
* Copyright (C) 2010 Wim Vriend (Developing) *
* Ron Hendriks (Researching and Testing) *
* *
* Homepage *
* *
* This program is free software; you can redistribute it and/or modify it *
* under the terms of the GNU General Public License as published by the *
* Free Software Foundation; either version 3 of the License, or (at your *
* option) any later version. *
* *
* This program is distributed in the hope that it will be useful, but *
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY *
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for *
* more details. *
* *
* Adopted this widget from the 'textures' sample of the Nokia Qt toolkit. *
* *
* You should have received a copy of the GNU General Public License along *
* with this program; if not, see <http://www.gnu.org/licenses/>. *
*********************************************************************************/
#include <QtGui>
#include <QtOpenGL>
#include "glwidget.h"
GLWidget::GLWidget(QWidget *parent, QGLWidget *shareWidget)
: QGLWidget(parent, shareWidget)
{
clearColor = Qt::black;
xRot = 0;
yRot = 0;
zRot = 0;
#ifdef QT_OPENGL_ES_2
program = 0;
#endif
}
GLWidget::~GLWidget()
{
}
QSize GLWidget::minimumSizeHint() const
{
return QSize(60, 60);
}
QSize GLWidget::sizeHint() const
{
return QSize(90, 90);
}
void GLWidget::rotateBy(int xAngle, int yAngle, int zAngle)
{
xRot = xAngle;
yRot = yAngle;
zRot = zAngle;
updateGL();
}
void GLWidget::setClearColor(const QColor &color)
{
clearColor = color;
updateGL();
}
void GLWidget::initializeGL()
{
makeObject();
glEnable(GL_DEPTH_TEST);
glEnable(GL_CULL_FACE);
#ifndef QT_OPENGL_ES_2
glEnable(GL_TEXTURE_2D);
#endif
#ifdef QT_OPENGL_ES_2
#define PROGRAM_VERTEX_ATTRIBUTE 0
#define PROGRAM_TEXCOORD_ATTRIBUTE 1
QGLShader *vshader = new QGLShader(QGLShader::Vertex, this);
const char *vsrc =
"attribute highp vec4 vertex;\n"
"attribute mediump vec4 texCoord;\n"
"varying mediump vec4 texc;\n"
"uniform mediump mat4 matrix;\n"
"void main(void)\n"
"{\n"
" gl_Position = matrix * vertex;\n"
" texc = texCoord;\n"
"}\n";
vshader->compileSourceCode(vsrc);
QGLShader *fshader = new QGLShader(QGLShader::Fragment, this);
const char *fsrc =
"uniform sampler2D texture;\n"
"varying mediump vec4 texc;\n"
"void main(void)\n"
"{\n"
" gl_FragColor = texture2D(texture, texc.st);\n"
"}\n";
fshader->compileSourceCode(fsrc);
program = new QGLShaderProgram(this);
program->addShader(vshader);
program->addShader(fshader);
program->bindAttributeLocation("vertex", PROGRAM_VERTEX_ATTRIBUTE);
program->bindAttributeLocation("texCoord", PROGRAM_TEXCOORD_ATTRIBUTE);
program->link();
program->bind();
program->setUniformValue("texture", 0);
#endif
}
void GLWidget::paintGL()
{
qglClearColor(clearColor);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
#if !defined(QT_OPENGL_ES_2)
glLoadIdentity();
glTranslatef(0.0f, 0.0f, -10.0f);
glRotatef(xRot, 1.0f, 0.0f, 0.0f);
glRotatef(yRot, 0.0f, 1.0f, 0.0f);
glRotatef(-1.0f * zRot, 0.0f, 0.0f, 1.0f);
glVertexPointer(3, GL_FLOAT, 0, vertices.constData());
glTexCoordPointer(2, GL_FLOAT, 0, texCoords.constData());
glEnableClientState(GL_VERTEX_ARRAY);
glEnableClientState(GL_TEXTURE_COORD_ARRAY);
#else
QMatrix4x4 m;
m.ortho(-0.5f, +0.5f, +0.5f, -0.5f, 4.0f, 15.0f);
m.translate(0.0f, 0.0f, -10.0f);
m.rotate(xRot / 16.0f, 1.0f, 0.0f, 0.0f);
m.rotate(yRot / 16.0f, 0.0f, 1.0f, 0.0f);
m.rotate(zRot / 16.0f, 0.0f, 0.0f, 1.0f);
program->setUniformValue("matrix", m);
program->enableAttributeArray(PROGRAM_VERTEX_ATTRIBUTE);
program->enableAttributeArray(PROGRAM_TEXCOORD_ATTRIBUTE);
program->setAttributeArray
(PROGRAM_VERTEX_ATTRIBUTE, vertices.constData());
program->setAttributeArray
(PROGRAM_TEXCOORD_ATTRIBUTE, texCoords.constData());
#endif
for (int i = 0; i < 6; ++i) {
glBindTexture(GL_TEXTURE_2D, textures[i]);
glDrawArrays(GL_TRIANGLE_FAN, i * 4, 4);
}
}
void GLWidget::resizeGL(int width, int height)
{
int side = qMin(width, height);
glViewport((width - side) / 2, (height - side) / 2, side, side);
#if !defined(QT_OPENGL_ES_2)
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
#ifndef QT_OPENGL_ES
glOrtho(-0.5, +0.5, +0.5, -0.5, 4.0, 15.0);
#else
glOrthof(-0.5, +0.5, +0.5, -0.5, 4.0, 15.0);
#endif
glMatrixMode(GL_MODELVIEW);
#endif
}
void GLWidget::makeObject()
{
static const int coords[6][4][3] = {
{ { +1, -1, -1 }, { -1, -1, -1 }, { -1, +1, -1 }, { +1, +1, -1 } },
{ { +1, +1, -1 }, { -1, +1, -1 }, { -1, +1, +1 }, { +1, +1, +1 } },
{ { +1, -1, +1 }, { +1, -1, -1 }, { +1, +1, -1 }, { +1, +1, +1 } },
{ { -1, -1, -1 }, { -1, -1, +1 }, { -1, +1, +1 }, { -1, +1, -1 } },
{ { +1, -1, +1 }, { -1, -1, +1 }, { -1, -1, -1 }, { +1, -1, -1 } },
{ { -1, -1, +1 }, { +1, -1, +1 }, { +1, +1, +1 }, { -1, +1, +1 } }
};
for (int j=0; j < 6; ++j) {
textures[j] = bindTexture
(QPixmap(QString(":/images/side%1.png").arg(j + 1)), GL_TEXTURE_2D);
}
for (int i = 0; i < 6; ++i) {
for (int j = 0; j < 4; ++j) {
texCoords.append
(QVector2D(j == 0 || j == 3, j == 0 || j == 1));
vertices.append
(QVector3D(0.4 * coords[i][j][0], 0.4 * coords[i][j][1],
0.02 * coords[i][j][2]));
}
}
}
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