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://ogre.sourceforge.net/
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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 |
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26 | #include "OgreGLHardwareOcclusionQuery.h"
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27 | #include "OgreException.h"
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28 |
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29 |
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30 | namespace Ogre {
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31 |
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32 | /**
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33 | * This is a class that is the base class of the query class for
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34 | * hardware occlusion testing.
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35 | *
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36 | * @author Lee Sandberg email: lee@abcmedia.se
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37 | *
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38 | * Updated on 12/7/2004 by Chris McGuirk
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39 | * - Implemented ARB_occlusion_query
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40 | */
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41 |
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42 | /**
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43 | * Default object constructor
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44 | *
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45 | */
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46 | GLHardwareOcclusionQuery::GLHardwareOcclusionQuery()
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47 | {
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48 | mPixelCount = 0;
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49 | mSkipCounter = 0;
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50 | mSkipInterval = 0;
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51 |
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52 | // Check for hardware occlusion support
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53 | // This is a hack to see if hw occlusion is supported. pointer is 0 if it's not supported.
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54 | //if (glGenQueriesARB_ptr != 0)
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55 | if (glGenOcclusionQueriesNV_ptr != 0)
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56 | {
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57 | mHasOcclusionSupport = true;
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58 | }
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59 | else
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60 | {
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61 | mHasOcclusionSupport = false;
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62 | }
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63 |
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64 | if(mHasOcclusionSupport)
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65 | {
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66 | //glGenQueriesARB_ptr(1, &mQueryID );
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67 | glGenOcclusionQueriesNV_ptr(1, &mQueryID);
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68 | }
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69 | }
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70 |
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71 | /**
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72 | * Object destructor
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73 | */
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74 | GLHardwareOcclusionQuery::~GLHardwareOcclusionQuery()
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75 | {
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76 | if( mHasOcclusionSupport )
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77 | {
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78 | //glDeleteQueriesARB_ptr(1, &mQueryID);
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79 | glDeleteOcclusionQueriesNV_ptr(1, &mQueryID);
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80 | }
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81 | }
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82 |
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83 | //------------------------------------------------------------------
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84 | // Occlusion query functions (see base class documentation for this)
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85 | //--
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86 | void GLHardwareOcclusionQuery::beginOcclusionQuery()
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87 | {
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88 | // Make it fail silently if hardware occlusion isn't supported
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89 | if(mHasOcclusionSupport)
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90 | {
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91 | // Counter starts at 0 again at mSkipInterval
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92 | #ifndef GTP_VISIBILITY_MODIFIED_OGRE
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93 | if(mSkipCounter == mSkipInterval)
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94 | #else
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95 | if (mSkipCounter >= mSkipInterval) // otherwise no query ever issued if mSkipInterval = 0 !
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96 | #endif // GTP_VISIBILITY_MODIFIED_OGRE
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97 | {
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98 | mSkipCounter = 0;
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99 | }
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100 |
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101 | if (mSkipCounter == 0)
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102 | {
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103 | //glBeginQueryARB_ptr(GL_SAMPLES_PASSED_ARB, mQueryID);
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104 | glBeginOcclusionQueryNV_ptr(mQueryID);
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105 | }
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106 | }
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107 | }
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108 |
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109 | void GLHardwareOcclusionQuery::endOcclusionQuery()
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110 | {
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111 | // Make it fail silently if hardware occlusion isn't supported
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112 | if(mHasOcclusionSupport)
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113 | {
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114 | if( mSkipCounter == 0)
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115 | {
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116 | //glEndQueryARB_ptr(GL_SAMPLES_PASSED_ARB);
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117 | glEndOcclusionQueryNV_ptr();
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118 | }
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119 |
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120 | mSkipCounter++;
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121 | }
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122 | }
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123 |
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124 | //------------------------------------------------------------------
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125 | // OpenGL dosn't use the flag paramter.
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126 | //------------------------------------------------------------------
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127 | bool GLHardwareOcclusionQuery::pullOcclusionQuery( unsigned int* NumOfFragments, const HW_OCCLUSIONQUERY flag )
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128 | {
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129 | if( mHasOcclusionSupport ) // Make it fail silently if hardware occlusion isn't supported
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130 | {
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131 | //glGetQueryObjectuivARB_ptr(mQueryID, GL_QUERY_RESULT_ARB, NumOfFragments);
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132 | glGetOcclusionQueryuivNV_ptr(mQueryID, GL_PIXEL_COUNT_NV, NumOfFragments);
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133 | }
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134 | else
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135 | {
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136 | *NumOfFragments = 100000; // Fails quitlly -> every object tested is visable.
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137 | }
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138 |
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139 | mPixelCount = *NumOfFragments;
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140 |
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141 | return true;
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142 | }
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143 |
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144 | #ifdef GTP_VISIBILITY_MODIFIED_OGRE
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145 | //------------------------------------------------------------------
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146 | bool GLHardwareOcclusionQuery::pullOcclusionQuery( unsigned int * NumOfFragments, const bool waitForResult, const HW_OCCLUSIONQUERY flag)
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147 | {
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148 | unsigned int isAvailable = GL_TRUE;
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149 |
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150 | if (mHasOcclusionSupport)
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151 | {
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152 | if (!waitForResult)
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153 | {
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154 | // use nv queries rather that arb because they are faster (no flush)
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155 | //glGetQueryivARB_ptr(mQueryID, GL_QUERY_RESULT_AVAILABLE_ARB, &isAvailable);
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156 | glGetOcclusionQueryuivNV_ptr(mQueryID, GL_PIXEL_COUNT_AVAILABLE_NV, &isAvailable);
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157 | }
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158 |
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159 | if (isAvailable == GL_TRUE)
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160 | {
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161 | //glGetQueryObjectuivARB_ptr(mQueryID, GL_QUERY_RESULT_ARB, NumOfFragments);
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162 | glGetOcclusionQueryuivNV_ptr(mQueryID, GL_PIXEL_COUNT_NV, NumOfFragments);
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163 | }
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164 | }
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165 | else
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166 | {
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167 | // In case hardware occlusion isn't supported, every object is set visible.
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168 | *NumOfFragments = 100000;
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169 | }
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170 |
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171 | mPixelCount = *NumOfFragments;
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172 |
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173 | return isAvailable == GL_TRUE;
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174 | }
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175 |
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176 | #endif // GTP_VIBILITY_MODIFIED_OGRE
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177 | }
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