[1] | 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) 2000-2006 Torus Knot Software Ltd |
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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 | You may alternatively use this source under the terms of a specific version of |
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| 25 | the OGRE Unrestricted License provided you have obtained such a license from |
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| 26 | Torus Knot Software Ltd. |
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| 27 | ----------------------------------------------------------------------------- |
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| 28 | */ |
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| 29 | |
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| 30 | #include "OgreGLHardwareOcclusionQuery.h" |
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| 31 | #include "OgreException.h" |
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| 32 | |
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| 33 | namespace Ogre { |
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| 34 | |
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| 35 | /** |
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| 36 | * This is a class that is the base class of the query class for |
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| 37 | * hardware occlusion testing. |
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| 38 | * |
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| 39 | * @author Lee Sandberg email: lee@abcmedia.se |
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| 40 | * |
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| 41 | * Updated on 12/7/2004 by Chris McGuirk |
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| 42 | * - Implemented ARB_occlusion_query |
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| 43 | * Updated on 13/9/2005 by Tuan Kuranes email: tuan.kuranes@free.fr |
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| 44 | */ |
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| 45 | //------------------------------------------------------------------ |
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| 46 | /** |
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| 47 | * Default object constructor |
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| 48 | * |
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| 49 | */ |
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| 50 | GLHardwareOcclusionQuery::GLHardwareOcclusionQuery() |
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| 51 | { |
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| 52 | // Check for hardware occlusion support |
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| 53 | if(GLEW_VERSION_1_5 || GLEW_ARB_occlusion_query) |
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| 54 | { |
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| 55 | glGenQueriesARB(1, &mQueryID ); |
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| 56 | } |
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| 57 | else if (GLEW_NV_occlusion_query) |
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| 58 | { |
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| 59 | glGenOcclusionQueriesNV(1, &mQueryID); |
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| 60 | } |
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| 61 | else |
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| 62 | { |
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| 63 | OGRE_EXCEPT( Exception::ERR_INTERNAL_ERROR, |
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| 64 | "Cannot allocate a Hardware query. This video card doesn't supports it, sorry.", |
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| 65 | "GLHardwareOcclusionQuery::GLHardwareOcclusionQuery" ); |
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| 66 | } |
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| 67 | |
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| 68 | } |
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| 69 | //------------------------------------------------------------------ |
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| 70 | /** |
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| 71 | * Object destructor |
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| 72 | */ |
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| 73 | GLHardwareOcclusionQuery::~GLHardwareOcclusionQuery() |
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| 74 | { |
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| 75 | if(GLEW_VERSION_1_5 || GLEW_ARB_occlusion_query) |
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| 76 | { |
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| 77 | glDeleteQueriesARB(1, &mQueryID); |
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| 78 | } |
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| 79 | else if (GLEW_NV_occlusion_query) |
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| 80 | { |
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| 81 | glDeleteOcclusionQueriesNV(1, &mQueryID); |
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| 82 | } |
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| 83 | } |
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| 84 | //------------------------------------------------------------------ |
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| 85 | void GLHardwareOcclusionQuery::beginOcclusionQuery() |
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| 86 | { |
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| 87 | if(GLEW_VERSION_1_5 || GLEW_ARB_occlusion_query) |
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| 88 | { |
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| 89 | glBeginQueryARB(GL_SAMPLES_PASSED_ARB, mQueryID); |
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| 90 | } |
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| 91 | else if (GLEW_NV_occlusion_query) |
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| 92 | { |
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| 93 | glBeginOcclusionQueryNV(mQueryID); |
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| 94 | } |
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| 95 | } |
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| 96 | //------------------------------------------------------------------ |
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| 97 | void GLHardwareOcclusionQuery::endOcclusionQuery() |
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| 98 | { |
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| 99 | if(GLEW_VERSION_1_5 || GLEW_ARB_occlusion_query) |
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| 100 | { |
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| 101 | glEndQueryARB(GL_SAMPLES_PASSED_ARB); |
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| 102 | } |
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| 103 | else if (GLEW_NV_occlusion_query) |
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| 104 | { |
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| 105 | glEndOcclusionQueryNV(); |
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| 106 | } |
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| 107 | |
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| 108 | } |
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| 109 | //------------------------------------------------------------------ |
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| 110 | bool GLHardwareOcclusionQuery::pullOcclusionQuery( unsigned int* NumOfFragments ) |
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| 111 | { |
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| 112 | if(GLEW_VERSION_1_5 || GLEW_ARB_occlusion_query) |
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| 113 | { |
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| 114 | glGetQueryObjectuivARB(mQueryID, GL_QUERY_RESULT_ARB, (GLuint*)NumOfFragments); |
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| 115 | mPixelCount = *NumOfFragments; |
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| 116 | return true; |
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| 117 | } |
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| 118 | else if (GLEW_NV_occlusion_query) |
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| 119 | { |
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| 120 | glGetOcclusionQueryuivNV(mQueryID, GL_PIXEL_COUNT_NV, (GLuint*)NumOfFragments); |
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| 121 | mPixelCount = *NumOfFragments; |
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| 122 | return true; |
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| 123 | } |
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| 124 | |
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| 125 | return false; |
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| 126 | } |
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| 127 | //------------------------------------------------------------------ |
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| 128 | bool GLHardwareOcclusionQuery::isStillOutstanding(void) |
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| 129 | { |
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| 130 | GLuint available; |
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| 131 | |
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| 132 | if(GLEW_VERSION_1_5 || GLEW_ARB_occlusion_query) |
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| 133 | { |
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| 134 | glGetQueryObjectuivARB(mQueryID, GL_QUERY_RESULT_AVAILABLE_ARB, &available); |
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| 135 | } |
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| 136 | else if (GLEW_NV_occlusion_query) |
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| 137 | { |
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| 138 | glGetOcclusionQueryuivNV(mQueryID, GL_PIXEL_COUNT_AVAILABLE_NV, &available); |
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| 139 | } |
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| 140 | |
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| 141 | // GL_TRUE means a wait would occur |
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| 142 | return !(available == GL_TRUE); |
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| 143 | } |
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| 144 | |
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| 145 | } |
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| 146 | |
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| 147 | |
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