# Visualization Library

A lightweight C++ OpenGL middleware for 2D/3D graphics

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# D:/VL/BuildSystem/VL_DISTRO/Visualization_Library_SDK/src/vlGraphics/ProjViewTransfCallback.cpp

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    00001 /**************************************************************************************/
    00002 /*                                                                                    */
    00003 /*  Visualization Library                                                             */
    00004 /*  http://www.visualizationlibrary.org                                               */
    00005 /*                                                                                    */
    00006 /*  Copyright (c) 2005-2011, Michele Bosi                                             */
    00007 /*  All rights reserved.                                                              */
    00008 /*                                                                                    */
    00009 /*  Redistribution and use in source and binary forms, with or without modification,  */
    00010 /*  are permitted provided that the following conditions are met:                     */
    00011 /*                                                                                    */
    00012 /*  - Redistributions of source code must retain the above copyright notice, this     */
    00013 /*  list of conditions and the following disclaimer.                                  */
    00014 /*                                                                                    */
    00015 /*  - Redistributions in binary form must reproduce the above copyright notice, this  */
    00016 /*  list of conditions and the following disclaimer in the documentation and/or       */
    00017 /*  other materials provided with the distribution.                                   */
    00018 /*                                                                                    */
    00019 /*  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND   */
    00020 /*  ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED     */
    00021 /*  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE            */
    00022 /*  DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR  */
    00023 /*  ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES    */
    00024 /*  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;      */
    00025 /*  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON    */
    00026 /*  ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT           */
    00027 /*  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS     */
    00028 /*  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.                      */
    00029 /*                                                                                    */
    00030 /**************************************************************************************/
    00031
    00032 #include <vlGraphics/ProjViewTransfCallback.hpp>
    00033 #include <vlCore/Transform.hpp>
    00034 #include <vlGraphics/Camera.hpp>
    00035 #include <vlGraphics/GLSL.hpp>
    00036
    00037 using namespace vl;
    00038
    00039 //------------------------------------------------------------------------------
    00040 // ProjViewTransfCallbackStandard
    00041 //------------------------------------------------------------------------------
    00042 void ProjViewTransfCallback::updateMatrices(bool cam_changed, bool transf_changed, const GLSLProgram* glsl_program, const Camera* camera, const Transform* transform)
    00043 {
    00044   // Once you opt-in for using VL substitutes for matrix variables you should not use the GL fixed-function ones such as:
    00045   // gl_ModelViewMatrix, gl_ProjectionMatrix, gl_ModelViewProjectionMatrix and gl_NormalMatrix
    00046   // see http://www.opengl.org/registry/doc/GLSLangSpec.Full.1.10.59.pdf pag 45
    00047
    00048   // Also, don't use the fixed function pipeline if we don't have it!
    00049
    00050   bool use_fixed_function_matrices = Has_Fixed_Function_Pipeline;
    00051
    00052   // projection matrix
    00053   if ( cam_changed )
    00054   {
    00055     if ( glsl_program && glsl_program->vl_ProjectionMatrix() != -1 )
    00056     {
    00057       use_fixed_function_matrices = false;
    00058 #if VL_PIPELINE_PRECISION == 1
    00059       glUniformMatrix4fv( glsl_program->vl_ProjectionMatrix(), 1, GL_FALSE, camera->projectionMatrix().ptr() ); VL_CHECK_OGL();
    00060 #elif VL_PIPELINE_PRECISION == 2
    00061       glUniformMatrix4fv( glsl_program->vl_ProjectionMatrix(), 1, GL_FALSE, ((fmat4)camera->projectionMatrix()).ptr() ); VL_CHECK_OGL();
    00062 #endif
    00063     }
    00064
    00065     if ( use_fixed_function_matrices )
    00066     {
    00067       // this updates
    00068       glMatrixMode(GL_PROJECTION); VL_CHECK_OGL();
    00069       VL_glLoadMatrix( camera->projectionMatrix().ptr() ); VL_CHECK_OGL();
    00070     }
    00071   }
    00072
    00073   // model + view transform
    00074   if ( cam_changed || transf_changed )
    00075   {
    00076     // compute the modelview matrix to send to GL
    00077     mat4 modelview;
    00078     if ( transform )
    00079       modelview = camera->viewMatrix() * transform->worldMatrix();
    00080     else
    00081       modelview = camera->viewMatrix();
    00082
    00083     if ( glsl_program )
    00084     {
    00085       // update vl_ModelViewMatrix if used
    00086       if ( glsl_program->vl_ModelViewMatrix() != -1 )
    00087       {
    00088         use_fixed_function_matrices = false;
    00089 #if VL_PIPELINE_PRECISION == 1
    00090         glUniformMatrix4fv( glsl_program->vl_ModelViewMatrix(), 1, GL_FALSE, modelview.ptr() ); VL_CHECK_OGL();
    00091 #elif VL_PIPELINE_PRECISION == 2
    00092         glUniformMatrix4fv( glsl_program->vl_ModelViewMatrix(), 1, GL_FALSE, ((fmat4)modelview).ptr() ); VL_CHECK_OGL();
    00093 #endif
    00094       }
    00095
    00096       // update vl_ModelViewProjectionMatrix if used
    00097       if ( glsl_program->vl_ModelViewProjectionMatrix() != -1 )
    00098       {
    00099         use_fixed_function_matrices = false;
    00100 #if VL_PIPELINE_PRECISION == 1
    00101         glUniformMatrix4fv( glsl_program->vl_ModelViewProjectionMatrix(), 1, GL_FALSE, (camera->projectionMatrix() * modelview).ptr() ); VL_CHECK_OGL();
    00102 #elif VL_PIPELINE_PRECISION == 2
    00103         glUniformMatrix4fv( glsl_program->vl_ModelViewProjectionMatrix(), 1, GL_FALSE, ((fmat4)(camera->projectionMatrix() * modelview)).ptr() ); VL_CHECK_OGL();
    00104 #endif
    00105       }
    00106
    00107       // update vl_NormalMatrix if used
    00108       if ( glsl_program->vl_NormalMatrix() != -1 )
    00109       {
    00110         use_fixed_function_matrices = false;
    00111         // transpose of the inverse of the upper leftmost 3x3 of vl_ModelViewMatrix
    00112         mat4 normalmtx = modelview.as3x3();
    00113         normalmtx.invert();
    00114         normalmtx.transpose();
    00115 #if VL_PIPELINE_PRECISION == 1
    00116         glUniformMatrix4fv( glsl_program->vl_NormalMatrix(), 1, GL_FALSE, normalmtx.ptr() ); VL_CHECK_OGL();
    00117 #elif VL_PIPELINE_PRECISION == 2
    00118         glUniformMatrix4fv( glsl_program->vl_NormalMatrix(), 1, GL_FALSE, ((fmat4)normalmtx).ptr() ); VL_CHECK_OGL();
    00119 #endif
    00120       }
    00121     }
    00122
    00123     if( use_fixed_function_matrices )
    00124     {
    00125       glMatrixMode(GL_MODELVIEW); VL_CHECK_OGL();
    00126       VL_glLoadMatrix( modelview.ptr() ); VL_CHECK_OGL();
    00127     }
    00128   }
    00129 }
    00130 //------------------------------------------------------------------------------

Visualization Library v2011.09.1162 Reference Documentation
Copyright 2005-2011 Michele Bosi. All rights reserved.
Updated on Thu Jan 26 2012 00:43:41.
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