nevrax.org : docs

00001 
+00007 /* Copyright, 2000, 2001 Nevrax Ltd.
+00008  *
+00009  * This file is part of NEVRAX NEL.
+00010  * NEVRAX NEL is free software; you can redistribute it and/or modify
+00011  * it under the terms of the GNU General Public License as published by
+00012  * the Free Software Foundation; either version 2, or (at your option)
+00013  * any later version.
+00014 
+00015  * NEVRAX NEL is distributed in the hope that it will be useful, but
+00016  * WITHOUT ANY WARRANTY; without even the implied warranty of
+00017  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+00018  * General Public License for more details.
+00019 
+00020  * You should have received a copy of the GNU General Public License
+00021  * along with NEVRAX NEL; see the file COPYING. If not, write to the
+00022  * Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+00023  * MA 02111-1307, USA.
+00024  */
+00025 
+00026 #include "std3d.h"
+00027 
+00028 #include "nel/misc/common.h"
+00029 #include "3d/motion_blur.h"
+00030 #include "3d/driver.h"
+00031 #include "3d/texture.h"
+00032 #include "3d/texture_blank.h"
+00033 #include "3d/material.h"
+00034 
+00035 
+00036 namespace NL3D {
+00037 
+00038 
+00039 CMotionBlur::CMotionBlur() : _Tex(NULL), _X(0), _Y(0), _W(0), _H(0)
+00040 {
+00041 }
+00042 
+00043 
+00044 
+00045 void CMotionBlur::startMotionBlur(uint x, uint y, uint width, uint height)
+00046 {
+00047         nlassert(width > 0 && height > 0) ;
+00048         _X = x ;
+00049         _Y = y ;
+00050         _W = width ;
+00051         _H = height ;
+00052         _Tex = new CTextureBlank ;
+00053         _Tex->resize(NLMISC::raiseToNextPowerOf2(width), NLMISC::raiseToNextPowerOf2(height)) ;
+00054 }
+00055 
+00056 void CMotionBlur::releaseMotionBlur()
+00057 {
+00058         _Tex = NULL ;
+00059         _X = _Y = _W = _H = 0 ;
+00060 }
+00061 
+00062 void CMotionBlur::performMotionBlur(IDriver *driver, float motionBlurAmount)
+00063 {
+00064         nlassert(_Tex) ;  //start motion blur has not been called !!
+00065         nlassert(driver) ;
+00066         nlassert(motionBlurAmount >= 0.f && motionBlurAmount <= 1.f) ;
+00067         
+00068         static CVertexBuffer  vb ;
+00069         vb.setVertexFormat(CVertexBuffer::PositionFlag | CVertexBuffer::TexCoord0Flag ) ;
+00070         vb.setNumVertices(4) ;
+00071 
+00072         uint32 width, height ;
+00073         driver->getWindowSize(width, height) ;
+00074 
+00075         float widthRatio = _W / (float) NLMISC::raiseToNextPowerOf2 (_W) ;
+00076         float heightRatio = _H / (float) NLMISC::raiseToNextPowerOf2 (_H) ;
+00077 
+00078         driver->setFrustum(0, (float) width, 0, (float) height, -1, 1, false) ;
+00079 
+00080         for (uint sn = 0 ; sn < 2 ; ++sn)
+00081         {
+00082                 vb.setTexCoord(0, sn, CUV(0, 0)) ; 
+00083                 vb.setTexCoord(1, sn, CUV(widthRatio, 0)) ; 
+00084                 vb.setTexCoord(2, sn, CUV(widthRatio, heightRatio)) ; 
+00085                 vb.setTexCoord(3, sn, CUV(0, heightRatio)) ; 
+00086         }
+00087 
+00088 
+00089         static CMaterial mbMat ;
+00090         static bool matSetup = false ; // set to true when mbMat has Been setup
+00091         if (!matSetup)
+00092         {
+00093                 mbMat.setBlend(true) ;
+00094                 mbMat.setBlendFunc(CMaterial::srcalpha, CMaterial::invsrcalpha) ;       
+00095                 mbMat.setZWrite(false) ;
+00096                 mbMat.setZFunc(CMaterial::always) ;     
+00097                 // stage 0          
+00098                 mbMat.setTexture(0, _Tex) ;
+00099                 mbMat.texEnvOpRGB(0, CMaterial::Replace );
+00100 
+00101                 mbMat.texEnvArg0Alpha(0, CMaterial::Diffuse, CMaterial::SrcAlpha);
+00102                 mbMat.texEnvOpAlpha(0, CMaterial::Replace);
+00103                 
+00104                 mbMat.setDoubleSided(true) ;
+00105                 matSetup = true ;
+00106         }
+00107 
+00108 
+00109         mbMat.setColor(CRGBA(255, 255, 255, (uint8) (255.f * motionBlurAmount) ) ) ;            
+00110 
+00111 
+00112         vb.setVertexCoord(0, CVector((float) _X, 0, 0) ) ;
+00113         vb.setVertexCoord(1, CVector((float) (_X + _W), 0 ,0) ) ;
+00114         vb.setVertexCoord(2, CVector((float) (_X + _W), 0, (float) (_Y + _H) ) );
+00115         vb.setVertexCoord(3, CVector(0 , 0, (float) (_Y + _H) ) ) ;
+00116 
+00117         driver->setupViewMatrix(CMatrix::Identity) ;
+00118         driver->setupModelMatrix(CMatrix::Identity) ;
+00119         
+00120 
+00121         driver->activeVertexBuffer(vb) ;
+00122         driver->renderQuads(mbMat, 0, 1) ;
+00123 
+00124         // blit back frame buffer to save this frame
+00125 
+00126 
+00127 
+00128         driver->copyFrameBufferToTexture(_Tex, 0, 0, 0, _X, _Y, _W, _H) ;
+00129         
+00130 
+00131 }
+00132 
+00133 
+00134 } // NL3D
+
motion_blur.cpp
