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1 /**************************************************************************** |
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2 ** |
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3 ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). |
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4 ** All rights reserved. |
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5 ** Contact: Nokia Corporation (qt-info@nokia.com) |
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6 ** |
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7 ** This file is part of the examples of the Qt Toolkit. |
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8 ** |
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9 ** $QT_BEGIN_LICENSE:LGPL$ |
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10 ** No Commercial Usage |
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11 ** This file contains pre-release code and may not be distributed. |
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12 ** You may use this file in accordance with the terms and conditions |
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13 ** contained in the Technology Preview License Agreement accompanying |
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14 ** this package. |
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15 ** |
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16 ** GNU Lesser General Public License Usage |
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17 ** Alternatively, this file may be used under the terms of the GNU Lesser |
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18 ** General Public License version 2.1 as published by the Free Software |
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19 ** Foundation and appearing in the file LICENSE.LGPL included in the |
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20 ** packaging of this file. Please review the following information to |
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21 ** ensure the GNU Lesser General Public License version 2.1 requirements |
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22 ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. |
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23 ** |
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24 ** In addition, as a special exception, Nokia gives you certain additional |
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25 ** rights. These rights are described in the Nokia Qt LGPL Exception |
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26 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. |
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27 ** |
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28 ** If you have questions regarding the use of this file, please contact |
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29 ** Nokia at qt-info@nokia.com. |
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30 ** |
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31 ** |
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32 ** |
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33 ** |
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34 ** |
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35 ** |
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36 ** |
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37 ** |
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38 ** $QT_END_LICENSE$ |
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39 ** |
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40 ****************************************************************************/ |
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41 |
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42 #include <QtGui> |
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43 #include <QtOpenGL> |
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44 |
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45 #include "glwidget.h" |
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46 |
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47 GLWidget::GLWidget(QWidget *parent, QGLWidget *shareWidget) |
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48 : QGLWidget(parent, shareWidget) |
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49 { |
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50 clearColor = Qt::black; |
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51 xRot = 0; |
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52 yRot = 0; |
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53 zRot = 0; |
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54 #ifdef QT_OPENGL_ES_2 |
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55 program = 0; |
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56 #endif |
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57 } |
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58 |
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59 GLWidget::~GLWidget() |
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60 { |
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61 } |
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62 |
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63 QSize GLWidget::minimumSizeHint() const |
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64 { |
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65 return QSize(50, 50); |
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66 } |
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67 |
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68 QSize GLWidget::sizeHint() const |
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69 { |
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70 return QSize(200, 200); |
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71 } |
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72 |
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73 void GLWidget::rotateBy(int xAngle, int yAngle, int zAngle) |
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74 { |
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75 xRot += xAngle; |
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76 yRot += yAngle; |
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77 zRot += zAngle; |
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78 updateGL(); |
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79 } |
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80 |
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81 void GLWidget::setClearColor(const QColor &color) |
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82 { |
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83 clearColor = color; |
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84 updateGL(); |
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85 } |
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86 |
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87 void GLWidget::initializeGL() |
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88 { |
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89 makeObject(); |
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90 |
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91 glEnable(GL_DEPTH_TEST); |
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92 glEnable(GL_CULL_FACE); |
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93 #ifndef QT_OPENGL_ES_2 |
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94 glEnable(GL_TEXTURE_2D); |
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95 #endif |
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96 |
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97 #ifdef QT_OPENGL_ES_2 |
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98 |
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99 #define PROGRAM_VERTEX_ATTRIBUTE 0 |
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100 #define PROGRAM_TEXCOORD_ATTRIBUTE 1 |
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101 |
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102 QGLShader *vshader = new QGLShader(QGLShader::VertexShader, this); |
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103 const char *vsrc = |
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104 "attribute highp vec4 vertex;\n" |
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105 "attribute mediump vec4 texCoord;\n" |
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106 "varying mediump vec4 texc;\n" |
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107 "uniform mediump mat4 matrix;\n" |
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108 "void main(void)\n" |
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109 "{\n" |
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110 " gl_Position = matrix * vertex;\n" |
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111 " texc = texCoord;\n" |
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112 "}\n"; |
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113 vshader->compile(vsrc); |
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114 |
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115 QGLShader *fshader = new QGLShader(QGLShader::FragmentShader, this); |
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116 const char *fsrc = |
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117 "uniform sampler2D texture;\n" |
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118 "varying mediump vec4 texc;\n" |
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119 "void main(void)\n" |
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120 "{\n" |
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121 " gl_FragColor = texture2D(texture, texc.st);\n" |
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122 "}\n"; |
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123 fshader->compile(fsrc); |
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124 |
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125 program = new QGLShaderProgram(this); |
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126 program->addShader(vshader); |
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127 program->addShader(fshader); |
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128 program->bindAttributeLocation("vertex", PROGRAM_VERTEX_ATTRIBUTE); |
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129 program->bindAttributeLocation("texCoord", PROGRAM_TEXCOORD_ATTRIBUTE); |
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130 program->link(); |
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131 |
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132 program->enable(); |
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133 program->setUniformValue("texture", 0); |
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134 |
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135 #endif |
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136 } |
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137 |
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138 void GLWidget::paintGL() |
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139 { |
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140 qglClearColor(clearColor); |
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141 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); |
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142 |
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143 #if !defined(QT_OPENGL_ES_2) |
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144 |
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145 glLoadIdentity(); |
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146 glTranslatef(0.0f, 0.0f, -10.0f); |
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147 glRotatef(xRot / 16.0f, 1.0f, 0.0f, 0.0f); |
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148 glRotatef(yRot / 16.0f, 0.0f, 1.0f, 0.0f); |
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149 glRotatef(zRot / 16.0f, 0.0f, 0.0f, 1.0f); |
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150 |
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151 glVertexPointer(3, GL_FLOAT, 0, vertices.constData()); |
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152 glTexCoordPointer(2, GL_FLOAT, 0, texCoords.constData()); |
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153 glEnableClientState(GL_VERTEX_ARRAY); |
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154 glEnableClientState(GL_TEXTURE_COORD_ARRAY); |
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155 |
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156 #else |
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157 |
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158 QMatrix4x4 m; |
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159 m.ortho(-0.5f, +0.5f, +0.5f, -0.5f, 4.0f, 15.0f); |
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160 m.translate(0.0f, 0.0f, -10.0f); |
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161 m.rotate(xRot / 16.0f, 1.0f, 0.0f, 0.0f); |
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162 m.rotate(yRot / 16.0f, 0.0f, 1.0f, 0.0f); |
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163 m.rotate(zRot / 16.0f, 0.0f, 0.0f, 1.0f); |
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164 |
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165 program->setUniformValue("matrix", m); |
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166 program->setAttributeArray |
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167 (PROGRAM_VERTEX_ATTRIBUTE, vertices.constData()); |
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168 program->setAttributeArray |
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169 (PROGRAM_TEXCOORD_ATTRIBUTE, texCoords.constData()); |
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170 |
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171 #endif |
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172 |
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173 for (int i = 0; i < 6; ++i) { |
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174 glBindTexture(GL_TEXTURE_2D, textures[i]); |
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175 glDrawArrays(GL_TRIANGLE_FAN, i * 4, 4); |
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176 } |
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177 } |
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178 |
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179 void GLWidget::resizeGL(int width, int height) |
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180 { |
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181 int side = qMin(width, height); |
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182 glViewport((width - side) / 2, (height - side) / 2, side, side); |
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183 |
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184 #if !defined(QT_OPENGL_ES_2) |
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185 glMatrixMode(GL_PROJECTION); |
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186 glLoadIdentity(); |
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187 #ifndef QT_OPENGL_ES |
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188 glOrtho(-0.5, +0.5, +0.5, -0.5, 4.0, 15.0); |
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189 #else |
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190 glOrthof(-0.5, +0.5, +0.5, -0.5, 4.0, 15.0); |
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191 #endif |
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192 glMatrixMode(GL_MODELVIEW); |
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193 #endif |
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194 } |
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195 |
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196 void GLWidget::mousePressEvent(QMouseEvent *event) |
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197 { |
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198 lastPos = event->pos(); |
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199 } |
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200 |
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201 void GLWidget::mouseMoveEvent(QMouseEvent *event) |
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202 { |
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203 int dx = event->x() - lastPos.x(); |
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204 int dy = event->y() - lastPos.y(); |
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205 |
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206 if (event->buttons() & Qt::LeftButton) { |
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207 rotateBy(8 * dy, 8 * dx, 0); |
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208 } else if (event->buttons() & Qt::RightButton) { |
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209 rotateBy(8 * dy, 0, 8 * dx); |
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210 } |
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211 lastPos = event->pos(); |
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212 } |
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213 |
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214 void GLWidget::mouseReleaseEvent(QMouseEvent * /* event */) |
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215 { |
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216 emit clicked(); |
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217 } |
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218 |
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219 void GLWidget::makeObject() |
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220 { |
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221 static const int coords[6][4][3] = { |
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222 { { +1, -1, -1 }, { -1, -1, -1 }, { -1, +1, -1 }, { +1, +1, -1 } }, |
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223 { { +1, +1, -1 }, { -1, +1, -1 }, { -1, +1, +1 }, { +1, +1, +1 } }, |
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224 { { +1, -1, +1 }, { +1, -1, -1 }, { +1, +1, -1 }, { +1, +1, +1 } }, |
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225 { { -1, -1, -1 }, { -1, -1, +1 }, { -1, +1, +1 }, { -1, +1, -1 } }, |
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226 { { +1, -1, +1 }, { -1, -1, +1 }, { -1, -1, -1 }, { +1, -1, -1 } }, |
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227 { { -1, -1, +1 }, { +1, -1, +1 }, { +1, +1, +1 }, { -1, +1, +1 } } |
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228 }; |
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229 |
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230 for (int j=0; j < 6; ++j) { |
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231 textures[j] = bindTexture |
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232 (QPixmap(QString(":/images/side%1.png").arg(j + 1)), GL_TEXTURE_2D); |
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233 } |
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234 |
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235 for (int i = 0; i < 6; ++i) { |
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236 for (int j = 0; j < 4; ++j) { |
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237 texCoords.append |
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238 (QVector2D(j == 0 || j == 3, j == 0 || j == 1)); |
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239 vertices.append |
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240 (QVector3D(0.2 * coords[i][j][0], 0.2 * coords[i][j][1], |
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241 0.2 * coords[i][j][2])); |
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242 } |
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243 } |
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244 } |