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 | namespace Ogre {
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30 |
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31 | bool GLHardwareOcclusionQuery::sUseArbQueries = false;
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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 | mHasOcclusionSupportARB = (glGenQueriesARB_ptr != 0);
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55 | mHasOcclusionSupportNV = (glGenOcclusionQueriesNV_ptr != 0);
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56 |
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57 | if (sUseArbQueries && mHasOcclusionSupportARB)
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58 | glGenQueriesARB_ptr(1, &mQueryID );
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59 | else if (!sUseArbQueries && mHasOcclusionSupportNV)
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60 | glGenOcclusionQueriesNV_ptr(1, &mQueryID);
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61 | }
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62 |
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63 | /**
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64 | * Object destructor
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65 | */
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66 | GLHardwareOcclusionQuery::~GLHardwareOcclusionQuery()
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67 | {
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68 | if (sUseArbQueries && mHasOcclusionSupportARB)
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69 | glDeleteQueriesARB_ptr(1, &mQueryID);
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70 | else if (!sUseArbQueries && mHasOcclusionSupportNV)
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71 | glDeleteOcclusionQueriesNV_ptr(1, &mQueryID);
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72 | }
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73 |
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74 | //------------------------------------------------------------------
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75 | // Occlusion query functions (see base class documentation for this)
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76 | //--
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77 | void GLHardwareOcclusionQuery::beginOcclusionQuery()
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78 | {
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79 | //if (mSkipCounter >= mSkipInterval) // otherwise no query ever issued if mSkipInterval = 0 !
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80 | // mSkipCounter = 0; if (mSkipCounter != 0) return;
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81 |
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82 | if (sUseArbQueries && mHasOcclusionSupportARB)
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83 | glBeginQueryARB_ptr(GL_SAMPLES_PASSED_ARB, mQueryID);
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84 | else if (!sUseArbQueries && mHasOcclusionSupportNV)
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85 | glBeginOcclusionQueryNV_ptr(mQueryID);
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86 | }
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87 |
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88 | void GLHardwareOcclusionQuery::endOcclusionQuery()
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89 | {
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90 | //if( mSkipCounter != 0) return;
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91 | if (sUseArbQueries && mHasOcclusionSupportARB)
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92 | glEndQueryARB_ptr(GL_SAMPLES_PASSED_ARB);
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93 | else if (!sUseArbQueries && mHasOcclusionSupportNV)
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94 | glEndOcclusionQueryNV_ptr();
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95 | // mSkipCounter++;
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96 | }
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97 |
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98 | bool GLHardwareOcclusionQuery::pullOcclusionQuery( unsigned int* NumOfFragments, const HW_OCCLUSIONQUERY flag )
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99 | {
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100 | if (sUseArbQueries && mHasOcclusionSupportARB)
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101 | glGetQueryObjectuivARB_ptr(mQueryID, GL_QUERY_RESULT_ARB, NumOfFragments);
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102 | else if (!sUseArbQueries && mHasOcclusionSupportNV)
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103 | glGetOcclusionQueryuivNV_ptr(mQueryID, GL_PIXEL_COUNT_NV, NumOfFragments);
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104 | else
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105 | *NumOfFragments = 100000; // Fails quietly
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106 |
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107 | mPixelCount = *NumOfFragments;
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108 |
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109 | return true;
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110 | }
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111 |
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112 | #ifdef GTP_VISIBILITY_MODIFIED_OGRE
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113 | //------------------------------------------------------------------
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114 | bool GLHardwareOcclusionQuery::pullOcclusionQuery(unsigned int * NumOfFragments,
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115 | const bool waitForResult,
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116 | const HW_OCCLUSIONQUERY flag)
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117 | {
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118 | if (sUseArbQueries && mHasOcclusionSupportARB)
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119 | {
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120 | int isAvailable = GL_TRUE;
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121 |
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122 | if (!waitForResult)
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123 | glGetQueryivARB_ptr(mQueryID, GL_QUERY_RESULT_AVAILABLE_ARB, &isAvailable);
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124 |
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125 | if (isAvailable == GL_TRUE)
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126 | glGetQueryObjectuivARB_ptr(mQueryID, GL_QUERY_RESULT_ARB, NumOfFragments);
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127 |
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128 | mPixelCount = *NumOfFragments;
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129 |
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130 | return isAvailable == GL_TRUE;
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131 | }
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132 | else if (!sUseArbQueries && mHasOcclusionSupportNV)
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133 | {
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134 | unsigned int isAvailable = GL_TRUE;
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135 |
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136 | if (!waitForResult)
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137 | glGetOcclusionQueryuivNV_ptr(mQueryID, GL_PIXEL_COUNT_AVAILABLE_NV, &isAvailable);
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138 |
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139 | if (isAvailable == GL_TRUE)
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140 | glGetOcclusionQueryuivNV_ptr(mQueryID, GL_PIXEL_COUNT_NV, NumOfFragments);
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141 |
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142 | mPixelCount = *NumOfFragments;
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143 |
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144 | return isAvailable == GL_TRUE;
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145 | }
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146 |
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147 | // In case hardware occlusion isn't supported, every object is set visible.
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148 | *NumOfFragments = 100000;
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149 | mPixelCount = *NumOfFragments;
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150 |
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151 | return GL_TRUE;
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152 | }
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153 |
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154 | #endif // GTP_VIBILITY_MODIFIED_OGRE
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155 | }
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