nel/src/3d/motion_blur.cpp

   1 // NeL - MMORPG Framework <http://dev.ryzom.com/projects/nel/>
   2 // Copyright (C) 2010  Winch Gate Property Limited
   3 //
   4 // This program is free software: you can redistribute it and/or modify
   5 // it under the terms of the GNU Affero General Public License as
   6 // published by the Free Software Foundation, either version 3 of the
   7 // License, or (at your option) any later version.
   8 //
   9 // This program is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU Affero General Public License for more details.
  13 //
  14 // You should have received a copy of the GNU Affero General Public License
  15 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16
  17 #include "std3d.h"
  18
  19 #include "nel/misc/common.h"
  20 #include "nel/3d/motion_blur.h"
  21 #include "nel/3d/driver.h"
  22 #include "nel/3d/texture.h"
  23 #include "nel/3d/texture_blank.h"
  24 #include "nel/3d/material.h"
  25
  26 #ifdef DEBUG_NEW
  27 #define new DEBUG_NEW
  28 #endif
  29
  30 namespace NL3D {
  31
  32
  33 CMotionBlur::CMotionBlur() : _Tex(NULL), _X(0), _Y(0), _W(0), _H(0)
  34 {
  35 }
  36
  37
  38
  39 void CMotionBlur::startMotionBlur(uint x, uint y, uint width, uint height)
  40 {
  41         nlassert(width > 0 && height > 0) ;
  42         _X = x ;
  43         _Y = y ;
  44         _W = width ;
  45         _H = height ;
  46         _Tex = new CTextureBlank ;
  47         _Tex->resize(NLMISC::raiseToNextPowerOf2(width), NLMISC::raiseToNextPowerOf2(height)) ;
  48 }
  49
  50 void CMotionBlur::releaseMotionBlur()
  51 {
  52         _Tex = NULL ;
  53         _X = _Y = _W = _H = 0 ;
  54 }
  55
  56 void CMotionBlur::performMotionBlur(IDriver *driver, float motionBlurAmount)
  57 {
  58         nlassert(_Tex) ;  //start motion blur has not been called !!
  59         nlassert(driver) ;
  60         nlassert(motionBlurAmount >= 0.f && motionBlurAmount <= 1.f) ;
  61
  62         static CVertexBuffer  vb ;
  63         vb.setVertexFormat(CVertexBuffer::PositionFlag | CVertexBuffer::TexCoord0Flag ) ;
  64         vb.setNumVertices(4) ;
  65
  66         uint32 width, height ;
  67         driver->getWindowSize(width, height) ;
  68
  69         float widthRatio = _W / (float) NLMISC::raiseToNextPowerOf2 (_W) ;
  70         float heightRatio = _H / (float) NLMISC::raiseToNextPowerOf2 (_H) ;
  71
  72         driver->setFrustum(0, (float) width, 0, (float) height, -1, 1, false) ;
  73
  74         static CMaterial mbMat ;
  75         {
  76                 CVertexBufferReadWrite vba;
  77                 vb.lock (vba);
  78                 for (uint sn = 0 ; sn < 2 ; ++sn)
  79                 {
  80                         vba.setTexCoord(0, sn, CUV(0, 0)) ;
  81                         vba.setTexCoord(1, sn, CUV(widthRatio, 0)) ;
  82                         vba.setTexCoord(2, sn, CUV(widthRatio, heightRatio)) ;
  83                         vba.setTexCoord(3, sn, CUV(0, heightRatio)) ;
  84                 }
  85
  86
  87                 static bool matSetup = false ; // set to true when mbMat has Been setup
  88                 if (!matSetup)
  89                 {
  90                         mbMat.setBlend(true) ;
  91                         mbMat.setBlendFunc(CMaterial::srcalpha, CMaterial::invsrcalpha) ;
  92                         mbMat.setZWrite(false) ;
  93                         mbMat.setZFunc(CMaterial::always) ;
  94                         // stage 0
  95                         mbMat.setTexture(0, _Tex) ;
  96                         mbMat.texEnvOpRGB(0, CMaterial::Replace );
  97
  98                         mbMat.texEnvArg0Alpha(0, CMaterial::Diffuse, CMaterial::SrcAlpha);
  99                         mbMat.texEnvOpAlpha(0, CMaterial::Replace);
 100
 101                         mbMat.setDoubleSided(true) ;
 102                         matSetup = true ;
 103                 }
 104
 105
 106                 mbMat.setColor(CRGBA(255, 255, 255, (uint8) (255.f * motionBlurAmount) ) ) ;
 107
 108
 109                 vba.setVertexCoord(0, CVector((float) _X, 0, 0) ) ;
 110                 vba.setVertexCoord(1, CVector((float) (_X + _W), 0 ,0) ) ;
 111                 vba.setVertexCoord(2, CVector((float) (_X + _W), 0, (float) (_Y + _H) ) );
 112                 vba.setVertexCoord(3, CVector(0 , 0, (float) (_Y + _H) ) ) ;
 113         }
 114
 115         driver->setupViewMatrix(CMatrix::Identity) ;
 116         driver->setupModelMatrix(CMatrix::Identity) ;
 117
 118
 119         driver->activeVertexBuffer(vb) ;
 120         driver->renderRawQuads(mbMat, 0, 1) ;
 121
 122         // blit back frame buffer to save this frame
 123
 124
 125
 126         // todo hulud : use the new render to texture interface
 127         // driver->copyFrameBufferToTexture(_Tex, 0, 0, 0, _X, _Y, _W, _H) ;
 128 }
 129
 130
 131 } // NL3D