/xbmc/screensavers/rsxs-0.9/src/euphoria/wisp.cc
C++ | 277 lines | 229 code | 17 blank | 31 comment | 29 complexity | 4a7f81f8564894817ed5ef58739dacf5 MD5 | raw file
1/* 2 * Really Slick XScreenSavers 3 * Copyright (C) 2002-2006 Michael Chapman 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License version 2 as 7 * published by the Free Software Foundation. 8 * 9 * This program is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, write to the Free Software 16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 17 * 18 ***************************************************************************** 19 * 20 * This is a Linux port of the Really Slick Screensavers, 21 * Copyright (C) 2002 Terence M. Welsh, available from www.reallyslick.com 22 */ 23#include <common.hh> 24 25#include <euphoria.hh> 26#include <wisp.hh> 27 28Wisp::Wisp() { 29 float recHalfDens = 1.0f / (float(Hack::density) * 0.5f); 30 31 _vertex.resize( Hack::density + 1, Hack::density + 1); 32 _intensity.resize(Hack::density + 1, Hack::density + 1); 33 _gridPos.resize( Hack::density + 1, Hack::density + 1); 34 35 for (unsigned int i = 0; i <= Hack::density; ++i) 36 for (unsigned int j = 0; j <= Hack::density; ++j) { 37 Vector v( 38 float(i) * recHalfDens - 1.0f, 39 float(j) * recHalfDens - 1.0f, 40 0.0f 41 ); 42 v.z() = v.lengthSquared(); 43 _gridPos(i, j) = v; 44 } 45 46 // initialize constants 47 for (unsigned int i = 0; i < NUMCONSTS; ++i) { 48 _c[i] = Common::randomFloat(2.0f) - 1.0f; 49 _cr[i] = Common::randomFloat(M_PI * 2.0f); 50 _cv[i] = Common::randomFloat(Hack::speed * 0.03f) + 51 (Hack::speed * 0.001f); 52 } 53 54 // pick color 55 _HSL.set( 56 Common::randomFloat(1.0f), 57 0.1f + Common::randomFloat(0.9f), 58 1.0f 59 ); 60 _hueSpeed = Common::randomFloat(0.1f) - 0.05f; 61 _saturationSpeed = Common::randomFloat(0.04f) + 0.001f; 62} 63 64void Wisp::update() { 65 // visibility constants 66 static float viscon1 = Hack::visibility * 0.01f; 67 static float viscon2 = 1.0f / viscon1; 68 69 // update constants 70 for (unsigned int i = 0; i < NUMCONSTS; ++i) { 71 _cr[i] += _cv[i] * Common::elapsedSecs; 72 if (_cr[i] > M_PI * 2.0f) 73 _cr[i] -= M_PI * 2.0f; 74 _c[i] = std::cos(_cr[i]); 75 } 76 77 // update vertex positions 78 for (unsigned int i = 0; i <= Hack::density; ++i) 79 for (unsigned int j = 0; j <= Hack::density; ++j) 80 _vertex(i, j).set( 81 _gridPos(i, j).x() * _gridPos(i, j).x() * 82 _gridPos(i, j).y() * _c[0] + 83 _gridPos(i, j).z() * _c[1] + 0.5f * _c[2], 84 _gridPos(i, j).y() * _gridPos(i, j).y() * 85 _gridPos(i, j).z() * _c[3] + 86 _gridPos(i, j).x() * _c[4] + 0.5f * _c[5], 87 _gridPos(i, j).z() * _gridPos(i, j).z() * 88 _gridPos(i, j).x() * _c[6] + 89 _gridPos(i, j).y() * _c[7] + _c[8] 90 ); 91 92 // update vertex normals for most of mesh 93 for (unsigned int i = 1; i < Hack::density; ++i) 94 for (unsigned int j = 1; j < Hack::density; ++j) { 95 Vector up(_vertex(i, j + 1) - _vertex(i, j - 1)); 96 Vector right(_vertex(i + 1, j) - _vertex(i - 1, j)); 97 up.normalize(); 98 right.normalize(); 99 Vector crossVec(Vector::cross(right, up)); 100 // Use depth component of normal to compute intensity 101 // This way only edges of wisp are bright 102 _intensity(i, j) = Common::clamp( 103 viscon2 * (viscon1 - std::abs(crossVec.z())), 104 0.0f, 1.0f 105 ); 106 } 107 108 // update color 109 float h = _HSL.h() + _hueSpeed * Common::elapsedSecs; 110 if (h < 0.0f) h += 1.0f; 111 if (h > 1.0f) h -= 1.0f; 112 float s = _HSL.s() + _saturationSpeed * Common::elapsedSecs; 113 if (s <= 0.1f) { 114 s = 0.1f; 115 _saturationSpeed = -_saturationSpeed; 116 } 117 if (s >= 1.0f) { 118 s = 1.0f; 119 _saturationSpeed = -_saturationSpeed; 120 } 121 _HSL.h() = h; 122 _HSL.s() = s; 123 _RGB = _HSL; 124} 125 126void Wisp::draw() const { 127 glPushMatrix(); 128 129 if (Hack::wireframe) { 130 for (unsigned int i = 1; i < Hack::density; ++i) { 131 glBegin(GL_LINE_STRIP); 132 for (unsigned int j = 0; j <= Hack::density; ++j) { 133 glColor3f( 134 _RGB.r() + _intensity(i, j) - 1.0f, 135 _RGB.g() + _intensity(i, j) - 1.0f, 136 _RGB.b() + _intensity(i, j) - 1.0f 137 ); 138 glTexCoord2d( 139 _gridPos(i, j).x() - _vertex(i, j).x(), 140 _gridPos(i, j).y() - _vertex(i, j).y() 141 ); 142 glVertex3fv(_vertex(i, j).get()); 143 } 144 glEnd(); 145 } 146 for (unsigned int j = 1; j < Hack::density; ++j) { 147 glBegin(GL_LINE_STRIP); 148 for (unsigned int i = 0; i <= Hack::density; ++i) { 149 glColor3f( 150 _RGB.r() + _intensity(i, j) - 1.0f, 151 _RGB.g() + _intensity(i, j) - 1.0f, 152 _RGB.b() + _intensity(i, j) - 1.0f 153 ); 154 glTexCoord2d( 155 _gridPos(i, j).x() - _vertex(i, j).x(), 156 _gridPos(i, j).y() - _vertex(i, j).y() 157 ); 158 glVertex3fv(_vertex(i, j).get()); 159 } 160 glEnd(); 161 } 162 } else { 163 for (unsigned int i = 0; i < Hack::density; ++i) { 164 glBegin(GL_TRIANGLE_STRIP); 165 for (unsigned int j = 0; j <= Hack::density; ++j) { 166 glColor3f( 167 _RGB.r() + _intensity(i + 1, j) - 1.0f, 168 _RGB.g() + _intensity(i + 1, j) - 1.0f, 169 _RGB.b() + _intensity(i + 1, j) - 1.0f 170 ); 171 glTexCoord2d( 172 _gridPos(i + 1, j).x() - _vertex(i + 1, j).x(), 173 _gridPos(i + 1, j).y() - _vertex(i + 1, j).y() 174 ); 175 glVertex3fv(_vertex(i + 1, j).get()); 176 glColor3f( 177 _RGB.r() + _intensity(i, j) - 1.0f, 178 _RGB.g() + _intensity(i, j) - 1.0f, 179 _RGB.b() + _intensity(i, j) - 1.0f 180 ); 181 glTexCoord2d( 182 _gridPos(i, j).x() - _vertex(i, j).x(), 183 _gridPos(i, j).y() - _vertex(i, j).y() 184 ); 185 glVertex3fv(_vertex(i, j).get()); 186 } 187 glEnd(); 188 } 189 } 190 191 glPopMatrix(); 192} 193 194void Wisp::drawAsBackground() const { 195 glPushMatrix(); 196 glTranslatef(_c[0] * 0.2f, _c[1] * 0.2f, 1.6f); 197 198 if (Hack::wireframe) { 199 for (unsigned int i = 1; i < Hack::density; ++i) { 200 glBegin(GL_LINE_STRIP); 201 for (unsigned int j = 0; j <= Hack::density; ++j) { 202 glColor3f( 203 _RGB.r() + _intensity(i, j) - 1.0f, 204 _RGB.g() + _intensity(i, j) - 1.0f, 205 _RGB.b() + _intensity(i, j) - 1.0f 206 ); 207 glTexCoord2d( 208 _gridPos(i, j).x() - _vertex(i, j).x(), 209 _gridPos(i, j).y() - _vertex(i, j).y() 210 ); 211 glVertex3f( 212 _gridPos(i, j).x(), 213 _gridPos(i, j).y(), 214 _intensity(i, j) 215 ); 216 } 217 glEnd(); 218 } 219 for (unsigned int j = 1; j < Hack::density; ++j) { 220 glBegin(GL_LINE_STRIP); 221 for (unsigned int i = 0; i <= Hack::density; ++i) { 222 glColor3f( 223 _RGB.r() + _intensity(i, j) - 1.0f, 224 _RGB.g() + _intensity(i, j) - 1.0f, 225 _RGB.b() + _intensity(i, j) - 1.0f 226 ); 227 glTexCoord2d( 228 _gridPos(i, j).x() - _vertex(i, j).x(), 229 _gridPos(i, j).y() - _vertex(i, j).y() 230 ); 231 glVertex3f( 232 _gridPos(i, j).x(), 233 _gridPos(i, j).y(), 234 _intensity(i, j) 235 ); 236 } 237 glEnd(); 238 } 239 } else { 240 for (unsigned int i = 0; i < Hack::density; ++i) { 241 glBegin(GL_TRIANGLE_STRIP); 242 for (unsigned int j = 0; j <= Hack::density; ++j) { 243 glColor3f( 244 _RGB.r() + _intensity(i + 1, j) - 1.0f, 245 _RGB.g() + _intensity(i + 1, j) - 1.0f, 246 _RGB.b() + _intensity(i + 1, j) - 1.0f 247 ); 248 glTexCoord2d( 249 _gridPos(i + 1, j).x() - _vertex(i + 1, j).x(), 250 _gridPos(i + 1, j).y() - _vertex(i + 1, j).y() 251 ); 252 glVertex3f( 253 _gridPos(i + 1, j).x(), 254 _gridPos(i + 1, j).y(), 255 _intensity(i + 1, j) 256 ); 257 glColor3f( 258 _RGB.r() + _intensity(i, j) - 1.0f, 259 _RGB.g() + _intensity(i, j) - 1.0f, 260 _RGB.b() + _intensity(i, j) - 1.0f 261 ); 262 glTexCoord2d( 263 _gridPos(i, j).x() - _vertex(i, j).x(), 264 _gridPos(i, j).y() - _vertex(i, j).y() 265 ); 266 glVertex3f( 267 _gridPos(i, j).x(), 268 _gridPos(i, j).y(), 269 _intensity(i, j) 270 ); 271 } 272 glEnd(); 273 } 274 } 275 276 glPopMatrix(); 277}