1 | /*
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2 | -----------------------------------------------------------------------------
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3 | This source file is part of OGRE
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4 | (Object-oriented Graphics Rendering Engine)
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5 | For the latest info, see http://www.ogre3d.org/
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6 |
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7 | Copyright (c) 2000-2005 The OGRE Team
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8 | Also see acknowledgements in Readme.html
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9 |
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10 | This program is free software; you can redistribute it and/or modify it under
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11 | the terms of the GNU Lesser General Public License as published by the Free Software
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12 | Foundation; either version 2 of the License, or (at your option) any later
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13 | version.
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14 |
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15 | This program is distributed in the hope that it will be useful, but WITHOUT
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16 | ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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17 | FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
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18 |
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19 | You should have received a copy of the GNU Lesser General Public License along with
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20 | this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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21 | Place - Suite 330, Boston, MA 02111-1307, USA, or go to
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22 | http://www.gnu.org/copyleft/lesser.txt.
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23 | -----------------------------------------------------------------------------
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24 | */
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25 | #include "OgreStableHeaders.h"
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26 | #include "OgreColourValue.h"
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27 |
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28 | namespace Ogre {
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29 |
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30 | const ColourValue ColourValue::ZERO = ColourValue(0.0,0.0,0.0,0.0);
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31 | const ColourValue ColourValue::Black = ColourValue(0.0,0.0,0.0);
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32 | const ColourValue ColourValue::White = ColourValue(1.0,1.0,1.0);
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33 | const ColourValue ColourValue::Red = ColourValue(1.0,0.0,0.0);
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34 | const ColourValue ColourValue::Green = ColourValue(0.0,1.0,0.0);
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35 | const ColourValue ColourValue::Blue = ColourValue(0.0,0.0,1.0);
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36 |
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37 | //---------------------------------------------------------------------
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38 | #if OGRE_ENDIAN == OGRE_ENDIAN_BIG
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39 | ABGR ColourValue::getAsABGR(void) const
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40 | #else
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41 | RGBA ColourValue::getAsRGBA(void) const
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42 | #endif
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43 | {
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44 | uint8 val8;
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45 | uint32 val32 = 0;
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46 |
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47 | // Convert to 32bit pattern
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48 | // (RGBA = 8888)
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49 |
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50 | // Red
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51 | val8 = static_cast<uint8>(r * 255);
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52 | val32 = val8 << 24;
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53 |
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54 | // Green
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55 | val8 = static_cast<uint8>(g * 255);
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56 | val32 += val8 << 16;
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57 |
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58 | // Blue
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59 | val8 = static_cast<uint8>(b * 255);
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60 | val32 += val8 << 8;
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61 |
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62 | // Alpha
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63 | val8 = static_cast<uint8>(a * 255);
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64 | val32 += val8;
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65 |
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66 | return val32;
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67 | }
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68 | //---------------------------------------------------------------------
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69 | #if OGRE_ENDIAN == OGRE_ENDIAN_BIG
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70 | BGRA ColourValue::getAsBGRA(void) const
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71 | #else
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72 | ARGB ColourValue::getAsARGB(void) const
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73 | #endif
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74 | {
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75 | uint8 val8;
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76 | uint32 val32 = 0;
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77 |
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78 | // Convert to 32bit pattern
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79 | // (ARGB = 8888)
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80 |
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81 | // Alpha
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82 | val8 = static_cast<uint8>(a * 255);
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83 | val32 = val8 << 24;
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84 |
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85 | // Red
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86 | val8 = static_cast<uint8>(r * 255);
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87 | val32 += val8 << 16;
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88 |
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89 | // Green
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90 | val8 = static_cast<uint8>(g * 255);
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91 | val32 += val8 << 8;
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92 |
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93 | // Blue
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94 | val8 = static_cast<uint8>(b * 255);
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95 | val32 += val8;
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96 |
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97 |
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98 | return val32;
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99 | }
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100 | //---------------------------------------------------------------------
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101 | #if OGRE_ENDIAN == OGRE_ENDIAN_BIG
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102 | ARGB ColourValue::getAsARGB(void) const
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103 | #else
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104 | BGRA ColourValue::getAsBGRA(void) const
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105 | #endif
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106 | {
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107 | uint8 val8;
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108 | uint32 val32 = 0;
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109 |
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110 | // Convert to 32bit pattern
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111 | // (ARGB = 8888)
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112 |
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113 | // Blue
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114 | val8 = static_cast<uint8>(b * 255);
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115 | val32 = val8 << 24;
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116 |
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117 | // Green
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118 | val8 = static_cast<uint8>(g * 255);
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119 | val32 += val8 << 16;
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120 |
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121 | // Red
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122 | val8 = static_cast<uint8>(r * 255);
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123 | val32 += val8 << 8;
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124 |
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125 | // Alpha
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126 | val8 = static_cast<uint8>(a * 255);
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127 | val32 += val8;
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128 |
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129 |
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130 | return val32;
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131 | }
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132 | //---------------------------------------------------------------------
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133 | #if OGRE_ENDIAN == OGRE_ENDIAN_BIG
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134 | RGBA ColourValue::getAsRGBA(void) const
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135 | #else
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136 | ABGR ColourValue::getAsABGR(void) const
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137 | #endif
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138 | {
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139 | uint8 val8;
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140 | uint32 val32 = 0;
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141 |
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142 | // Convert to 32bit pattern
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143 | // (ABRG = 8888)
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144 |
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145 | // Alpha
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146 | val8 = static_cast<uint8>(a * 255);
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147 | val32 = val8 << 24;
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148 |
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149 | // Blue
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150 | val8 = static_cast<uint8>(b * 255);
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151 | val32 += val8 << 16;
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152 |
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153 | // Green
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154 | val8 = static_cast<uint8>(g * 255);
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155 | val32 += val8 << 8;
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156 |
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157 | // Red
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158 | val8 = static_cast<uint8>(r * 255);
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159 | val32 += val8;
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160 |
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161 |
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162 | return val32;
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163 | }
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164 | //---------------------------------------------------------------------
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165 | #if OGRE_ENDIAN == OGRE_ENDIAN_BIG
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166 | void ColourValue::setAsABGR(const ABGR val)
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167 | #else
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168 | void ColourValue::setAsRGBA(const RGBA val)
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169 | #endif
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170 | {
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171 | uint32 val32 = val;
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172 |
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173 | // Convert from 32bit pattern
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174 | // (RGBA = 8888)
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175 |
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176 | // Red
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177 | r = static_cast<uint8>(val32 >> 24) / 255.0f;
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178 |
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179 | // Green
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180 | g = static_cast<uint8>(val32 >> 16) / 255.0f;
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181 |
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182 | // Blue
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183 | b = static_cast<uint8>(val32 >> 8) / 255.0f;
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184 |
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185 | // Alpha
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186 | a = static_cast<uint8>(val32) / 255.0f;
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187 | }
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188 | //---------------------------------------------------------------------
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189 | #if OGRE_ENDIAN == OGRE_ENDIAN_BIG
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190 | void ColourValue::setAsBGRA(const BGRA val)
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191 | #else
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192 | void ColourValue::setAsARGB(const ARGB val)
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193 | #endif
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194 | {
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195 | uint32 val32 = val;
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196 |
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197 | // Convert from 32bit pattern
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198 | // (ARGB = 8888)
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199 |
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200 | // Alpha
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201 | a = static_cast<uint8>(val32 >> 24) / 255.0f;
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202 |
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203 | // Red
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204 | r = static_cast<uint8>(val32 >> 16) / 255.0f;
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205 |
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206 | // Green
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207 | g = static_cast<uint8>(val32 >> 8) / 255.0f;
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208 |
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209 | // Blue
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210 | b = static_cast<uint8>(val32) / 255.0f;
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211 | }
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212 | //---------------------------------------------------------------------
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213 | #if OGRE_ENDIAN == OGRE_ENDIAN_BIG
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214 | void ColourValue::setAsARGB(const ARGB val)
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215 | #else
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216 | void ColourValue::setAsBGRA(const BGRA val)
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217 | #endif
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218 | {
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219 | uint32 val32 = val;
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220 |
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221 | // Convert from 32bit pattern
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222 | // (ARGB = 8888)
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223 |
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224 | // Blue
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225 | b = static_cast<uint8>(val32 >> 24) / 255.0f;
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226 |
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227 | // Green
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228 | g = static_cast<uint8>(val32 >> 16) / 255.0f;
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229 |
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230 | // Red
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231 | r = static_cast<uint8>(val32 >> 8) / 255.0f;
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232 |
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233 | // Alpha
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234 | a = static_cast<uint8>(val32) / 255.0f;
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235 | }
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236 | //---------------------------------------------------------------------
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237 | #if OGRE_ENDIAN == OGRE_ENDIAN_BIG
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238 | void ColourValue::setAsRGBA(const RGBA val)
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239 | #else
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240 | void ColourValue::setAsABGR(const ABGR val)
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241 | #endif
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242 | {
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243 | uint32 val32 = val;
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244 |
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245 | // Convert from 32bit pattern
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246 | // (ABGR = 8888)
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247 |
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248 | // Alpha
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249 | a = static_cast<uint8>(val32 >> 24) / 255.0f;
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250 |
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251 | // Blue
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252 | b = static_cast<uint8>(val32 >> 16) / 255.0f;
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253 |
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254 | // Green
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255 | g = static_cast<uint8>(val32 >> 8) / 255.0f;
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256 |
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257 | // Red
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258 | r = static_cast<uint8>(val32) / 255.0f;
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259 | }
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260 | //---------------------------------------------------------------------
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261 | bool ColourValue::operator==(const ColourValue& rhs) const
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262 | {
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263 | return (r == rhs.r &&
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264 | g == rhs.g &&
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265 | b == rhs.b &&
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266 | a == rhs.a);
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267 | }
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268 | //---------------------------------------------------------------------
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269 | bool ColourValue::operator!=(const ColourValue& rhs) const
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270 | {
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271 | return !(*this == rhs);
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272 | }
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273 | //---------------------------------------------------------------------
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274 | void ColourValue::setHSB(Real hue, Real saturation, Real brightness)
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275 | {
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276 | // wrap hue
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277 | if (hue > 1.0f)
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278 | {
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279 | hue -= (int)hue;
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280 | }
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281 | else if (hue < 0.0f)
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282 | {
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283 | hue += (int)hue + 1;
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284 | }
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285 | // clamp saturation / brightness
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286 | saturation = std::min(saturation, (Real)1.0);
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287 | saturation = std::max(saturation, (Real)0.0);
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288 | brightness = std::min(brightness, (Real)1.0);
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289 | brightness = std::max(brightness, (Real)0.0);
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290 |
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291 | if (brightness == 0.0f)
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292 | {
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293 | // early exit, this has to be black
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294 | r = g = b = 0.0f;
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295 | return;
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296 | }
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297 |
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298 | if (saturation == 0.0f)
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299 | {
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300 | // early exit, this has to be grey
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301 |
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302 | r = g = b = brightness;
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303 | return;
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304 | }
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305 |
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306 |
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307 | Real hueDomain = hue * 6.0f;
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308 | if (hueDomain >= 6.0f)
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309 | {
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310 | // wrap around, and allow mathematical errors
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311 | hueDomain = 0.0f;
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312 | }
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313 | unsigned short domain = (unsigned short)hueDomain;
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314 | Real f1 = brightness * (1 - saturation);
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315 | Real f2 = brightness * (1 - saturation * (hueDomain - domain));
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316 | Real f3 = brightness * (1 - saturation * (1 - (hueDomain - domain)));
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317 |
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318 | switch (domain)
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319 | {
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320 | case 0:
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321 | // red domain; green ascends
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322 | r = brightness;
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323 | g = f3;
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324 | b = f1;
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325 | break;
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326 | case 1:
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327 | // yellow domain; red descends
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328 | r = f2;
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329 | g = brightness;
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330 | b = f1;
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331 | break;
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332 | case 2:
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333 | // green domain; blue ascends
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334 | r = f1;
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335 | g = brightness;
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336 | b = f3;
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337 | break;
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338 | case 3:
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339 | // cyan domain; green descends
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340 | r = f1;
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341 | g = f2;
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342 | b = brightness;
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343 | break;
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344 | case 4:
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345 | // blue domain; red ascends
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346 | r = f3;
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347 | g = f1;
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348 | b = brightness;
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349 | break;
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350 | case 5:
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351 | // magenta domain; blue descends
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352 | r = brightness;
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353 | g = f1;
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354 | b = f2;
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355 | break;
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356 | }
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357 |
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358 |
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359 | }
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360 |
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361 | }
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362 |
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