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Documentation                       Search   mesh_blender.cpp Go to the documentation of this file. /* Copyright, 2000-2002 Nevrax Ltd. * * This file is part of NEVRAX NEL. * NEVRAX NEL is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2, or (at your option) * any later version. * NEVRAX NEL is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * You should have received a copy of the GNU General Public License * along with NEVRAX NEL; see the file COPYING. If not, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, * MA 02111-1307, USA. */ #include "std3d.h" #include "3d/mesh_blender.h" #include "3d/driver.h" #include "3d/fast_floor.h" namespace NL3D { // *************************************************************************** void CMeshBlender::prepareRenderForGlobalAlpha(CMaterial &material, IDriver *drv, float globalAlpha, uint8 globalAlphaInt, bool gaDisableZWrite) { // Disable ZWrite?? if(gaDisableZWrite) { // Backup and set new the zwrite _BkZWrite=material.getZWrite (); material.setZWrite (false); } // Backup blend _BkBlend=material.getBlend (); material.setBlend (true); // Backup opacity and blend _BkOpacity= material.getOpacity (); _BkSrcBlend= material.getSrcBlend(); _BkDstBlend= material.getDstBlend(); // 2 ways: if Blend Constant Color is supported or not. if(drv->supportBlendConstantColor()) { // Set opacity to 255 => If AlphaTest is used, AlphaTexture will be multiplied by 1. material.setOpacity ( 255 ); // set the Blend constant Alpha. drv->setBlendConstantColor( CRGBA(0,0,0, globalAlphaInt) ); // Active Blend with Blend Constant Alpha . material.setSrcBlend(CMaterial::blendConstantAlpha); // Don't set dest if we are in additive blend mode if ((_BkBlend == false) || (_BkDstBlend != CMaterial::one)) material.setDstBlend(CMaterial::blendConstantInvAlpha); // if material is Alpha Test, no-op. Keep same threshold, since Use Alpha of the BlendConstantColor // to do the alpha-blending. } // not supported, ugly way: modify Opacity, and alpha threshold else { // New opacity material.setOpacity (globalAlphaInt); // must ensure Std Blend. material.setSrcBlend(CMaterial::srcalpha); // Don't set dest if we are in additive blend mode if ((_BkBlend == false) || (_BkDstBlend != CMaterial::one)) material.setDstBlend(CMaterial::invsrcalpha); // if material is Alpha Test, must modulate AlphaTest limit to avoid Pop effects if(material.getAlphaTest()) { _BkAlphaTestThreshold= material.getAlphaTestThreshold(); material.setAlphaTestThreshold(_BkAlphaTestThreshold * globalAlpha); } } } // *************************************************************************** void CMeshBlender::restoreRender(CMaterial &material, IDriver *drv, bool gaDisableZWrite) { // Resetup backuped zwrite if(gaDisableZWrite) { material.setZWrite (_BkZWrite); } // Resetup backuped blend material.setBlend (_BkBlend); // Resetup backuped opacity and blend factors material.setOpacity (_BkOpacity); material.setSrcBlend(_BkSrcBlend); material.setDstBlend(_BkDstBlend); // 2 ways: if Blend Constant Color is supported or not. if(drv->supportBlendConstantColor()) { // nop } else { // Resetup backuped AlphaTest threshold if(material.getAlphaTest()) { material.setAlphaTestThreshold(_BkAlphaTestThreshold); } } } // *************************************************************************** void CMeshBlender::prepareRenderForGlobalAlphaCoarseMesh(CMaterial &material, IDriver *drv, NLMISC::CRGBA color, float globalAlpha, bool gaDisableZWrite) { // Don't need to bkup some values, because CoarseMesh. uint8 globalAlphaInt= (uint8)OptFastFloor(255 * globalAlpha); // Disable ZWrite?? if(gaDisableZWrite) material.setZWrite (false); // Enable blend material.setBlend (true); // bkup color and blend factors. _BkupColor= material.getColor(); _BkSrcBlend= material.getSrcBlend(); _BkDstBlend= material.getDstBlend(); // 2 ways: if Blend Constant Color is supported or not. if(drv->supportBlendConstantColor()) { // Set opacity to 255 => AlphaTexture will be multiplied by 1. color.A= 255; // change color material.setColor ( color ); // set the Blend constant Alpha. drv->setBlendConstantColor( CRGBA(0,0,0, globalAlphaInt) ); // Active Blend with Blend Constant Alpha . material.setSrcBlend(CMaterial::blendConstantAlpha); material.setDstBlend(CMaterial::blendConstantInvAlpha); } else { // Set current Alpha blend transparency (in color becausematerial is unlit) color.A= globalAlphaInt; // change color material.setColor ( color ); // Active Blend with Blend Constant Alpha . material.setSrcBlend(CMaterial::srcalpha); material.setDstBlend(CMaterial::invsrcalpha); // must modulate AlphaTest limit to avoid Pop effects material.setAlphaTestThreshold(0.5f * globalAlpha); } } // *************************************************************************** void CMeshBlender::restoreRenderCoarseMesh(CMaterial &material, IDriver *drv, bool gaDisableZWrite) { // Resetup backuped color and blend factors material.setColor ( _BkupColor ); material.setSrcBlend(_BkSrcBlend); material.setDstBlend(_BkDstBlend); // ReEnable ZWrite?? if(gaDisableZWrite) material.setZWrite (true); // Reset blend material.setBlend (false); // 2 ways: if Blend Constant Color is supported or not. if(drv->supportBlendConstantColor()) { // nop } else { // reset AlphaTest limit material.setAlphaTestThreshold(0.5f); } } } // NL3D