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388 lines
11 KiB
388 lines
11 KiB
/*==LICENSE==* |
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CyanWorlds.com Engine - MMOG client, server and tools |
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Copyright (C) 2011 Cyan Worlds, Inc. |
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This program is free software: you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation, either version 3 of the License, or |
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(at your option) any later version. |
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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You should have received a copy of the GNU General Public License |
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along with this program. If not, see <http://www.gnu.org/licenses/>. |
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Additional permissions under GNU GPL version 3 section 7 |
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If you modify this Program, or any covered work, by linking or |
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combining it with any of RAD Game Tools Bink SDK, Autodesk 3ds Max SDK, |
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NVIDIA PhysX SDK, Microsoft DirectX SDK, OpenSSL library, Independent |
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JPEG Group JPEG library, Microsoft Windows Media SDK, or Apple QuickTime SDK |
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(or a modified version of those libraries), |
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containing parts covered by the terms of the Bink SDK EULA, 3ds Max EULA, |
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PhysX SDK EULA, DirectX SDK EULA, OpenSSL and SSLeay licenses, IJG |
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JPEG Library README, Windows Media SDK EULA, or QuickTime SDK EULA, the |
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licensors of this Program grant you additional |
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permission to convey the resulting work. Corresponding Source for a |
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non-source form of such a combination shall include the source code for |
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the parts of OpenSSL and IJG JPEG Library used as well as that of the covered |
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work. |
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You can contact Cyan Worlds, Inc. by email legal@cyan.com |
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or by snail mail at: |
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Cyan Worlds, Inc. |
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14617 N Newport Hwy |
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Mead, WA 99021 |
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*==LICENSE==*/ |
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#include "hsTypes.h" |
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#include "plPipeline.h" |
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#include "plTweak.h" |
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#include "hsFastMath.h" |
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#include "plPerspDirSlave.h" |
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#include <float.h> |
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void plPerspDirSlave::Init() |
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{ |
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plShadowSlave::Init(); |
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fFlags |= kCastInCameraSpace; |
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} |
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hsPoint3 plPerspDirSlave::IProject(const hsMatrix44& world2NDC, const hsPoint3& pos, hsScalar w) const |
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{ |
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hsPoint3 retVal; |
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retVal.fX = world2NDC.fMap[0][0] * pos.fX |
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+ world2NDC.fMap[0][1] * pos.fY |
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+ world2NDC.fMap[0][2] * pos.fZ |
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+ world2NDC.fMap[0][3] * w; |
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retVal.fY = world2NDC.fMap[1][0] * pos.fX |
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+ world2NDC.fMap[1][1] * pos.fY |
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+ world2NDC.fMap[1][2] * pos.fZ |
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+ world2NDC.fMap[1][3] * w; |
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retVal.fZ = world2NDC.fMap[2][0] * pos.fX |
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+ world2NDC.fMap[2][1] * pos.fY |
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+ world2NDC.fMap[2][2] * pos.fZ |
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+ world2NDC.fMap[2][3] * w; |
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hsScalar invW = 1.f / ( |
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world2NDC.fMap[3][0] * pos.fX |
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+ world2NDC.fMap[3][1] * pos.fY |
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+ world2NDC.fMap[3][2] * pos.fZ |
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+ world2NDC.fMap[3][3] * w); |
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retVal *= invW; |
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return retVal; |
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} |
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hsBounds3Ext plPerspDirSlave::IGetPerspCasterBound(const hsMatrix44& world2NDC) const |
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{ |
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hsPoint3 corners[8]; |
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fCasterWorldBounds.GetCorners(corners); |
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hsPoint3 perspCorners[8]; |
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int i; |
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for( i = 0; i < 8; i++ ) |
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{ |
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perspCorners[i] = IProject(world2NDC, corners[i]); |
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if( perspCorners[i].fX < -1.f ) |
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perspCorners[i].fX = -1.f; |
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else if( perspCorners[i].fX > 1.f ) |
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perspCorners[i].fX = 1.f; |
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if( perspCorners[i].fY < -1.f ) |
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perspCorners[i].fY = -1.f; |
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else if( perspCorners[i].fY > 1.f ) |
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perspCorners[i].fY = 1.f; |
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if( perspCorners[i].fZ < 0 ) |
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perspCorners[i].Set(0.f, 0.f, 0.f); |
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} |
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hsBounds3Ext bnd; |
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bnd.MakeEmpty(); |
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for( i = 0; i < 8; i++ ) |
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bnd.Union(&perspCorners[i]); |
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return bnd; |
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} |
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bool plPerspDirSlave::SetupViewTransform(plPipeline* pipe) |
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{ |
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plViewTransform pipeView = pipe->GetViewTransform(); |
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plConst(hsScalar) kYon(100.f); |
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plConst(hsScalar) kHither(30.f); |
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pipeView.SetHither(kHither); |
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pipeView.SetYon(kYon); |
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hsMatrix44 cam2NDC = pipeView.GetCameraToNDC(); |
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hsMatrix44 world2NDC = cam2NDC * pipeView.GetWorldToCamera(); |
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fLightDir = fLightToWorld.GetAxis(hsMatrix44::kUp); |
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hsVector3 worldLiDir = fLightDir; |
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hsPoint3 pWorldLiDir(worldLiDir.fX, worldLiDir.fY, worldLiDir.fZ); |
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hsPoint3 perspLiPos = IProject(world2NDC, pWorldLiDir, 0); |
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hsBool reverseZ = fLightDir.InnerProduct(pipe->GetViewDirWorld()) > 0; |
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SetFlag(kReverseZ, reverseZ); |
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SetFlag(kReverseCull, reverseZ); |
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hsPoint3 lookAt; |
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plConst(hsBool) kUsePerspCenter(true); |
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plConst(hsBool) kUseFrustCenter(true); |
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if( kUsePerspCenter ) |
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{ |
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hsPoint3 lookAtCam = pipeView.GetWorldToCamera() * fCasterWorldBounds.GetCenter(); |
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hsPoint3 lookAtNDC = IProject(pipeView.GetCameraToNDC(), lookAtCam); |
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lookAt = IProject(world2NDC, fCasterWorldBounds.GetCenter()); |
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} |
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else if( kUseFrustCenter ) |
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{ |
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plConst(hsScalar) kDist(50.f); |
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hsPoint3 camFrustCenter(0.f, 0.f, kDist); |
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lookAt = IProject(cam2NDC, camFrustCenter); |
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} |
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else |
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{ |
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hsBounds3Ext ndcBnd(IGetPerspCasterBound(world2NDC)); |
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lookAt = ndcBnd.GetCenter(); |
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} |
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hsMatrix44 camNDC2Li; |
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hsMatrix44 li2CamNDC; |
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IComputeCamNDCToLight(perspLiPos, lookAt, camNDC2Li, li2CamNDC); |
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hsScalar minZ, maxZ; |
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hsScalar cotX, cotY; |
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plConst(hsBool) kFixedPersp(true); |
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if( !kFixedPersp ) |
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{ |
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hsBounds3Ext bnd(IGetPerspCasterBound(camNDC2Li * world2NDC)); |
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hsBounds3Ext bnd2(IGetPerspCasterBound(world2NDC)); |
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bnd2.Transform(&camNDC2Li); |
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plConst(hsBool) kUseBnd2(false); |
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if( kUseBnd2 ) |
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bnd = bnd2; |
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minZ = bnd.GetMins().fZ; |
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maxZ = bnd.GetMaxs().fZ; // THIS IS WRONG |
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// EAP |
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// This is my hack to get the Nexus age working. The real problem |
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// is probably data-side. I take full responsibility for this |
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// hack-around breaking the entire system, loosing data, causing |
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// unauthorized credit card transactions, etc. |
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if (_isnan(bnd.GetMins().fX) || _isnan(bnd.GetMins().fY)) |
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return false; |
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if (_isnan(bnd.GetMaxs().fX) || _isnan(bnd.GetMaxs().fY)) |
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return false; |
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// THIS IS EVEN MORE WRONG |
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plConst(hsBool) kFakeDepth(false); |
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if( kFakeDepth ) |
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{ |
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plConst(hsScalar) kMin(1.f); |
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plConst(hsScalar) kMax(30.f); |
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minZ = kMin; |
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maxZ = kMax; |
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} |
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plConst(hsScalar) kMinMinZ(1.f); |
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if( minZ < kMinMinZ ) |
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minZ = kMinMinZ; |
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if( -bnd.GetMins().fX > bnd.GetMaxs().fX ) |
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{ |
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hsAssert(bnd.GetMins().fX < 0, "Empty shadow caster bounds?"); |
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cotX = -minZ / bnd.GetMins().fX; |
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} |
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else |
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{ |
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hsAssert(bnd.GetMaxs().fX > 0, "Empty shadow caster bounds?"); |
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cotX = minZ / bnd.GetMaxs().fX; |
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} |
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if( -bnd.GetMins().fY > bnd.GetMaxs().fY ) |
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{ |
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hsAssert(bnd.GetMins().fY < 0, "Empty shadow caster bounds?"); |
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cotY = -minZ / bnd.GetMins().fY; |
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} |
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else |
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{ |
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hsAssert(bnd.GetMaxs().fY > 0, "Empty shadow caster bounds?"); |
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cotY = minZ / bnd.GetMaxs().fY; |
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} |
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} |
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else |
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{ |
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plConst(hsScalar) kHi(1.f); |
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hsBounds3Ext bnd; |
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const hsPoint3 lo(-1.f, -1.f, 0.f); |
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const hsPoint3 hi(1.f, 1.f, kHi); |
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bnd.MakeEmpty(); |
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bnd.Union(&lo); |
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bnd.Union(&hi); |
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bnd.Transform(&camNDC2Li); |
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minZ = bnd.GetMins().fZ; |
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maxZ = bnd.GetMaxs().fZ; // THIS IS WRONG |
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// EAP |
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// This is my hack to get the Nexus age working. The real problem |
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// is probably data-side. I take full responsibility for this |
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// hack-around breaking the entire system, loosing data, causing |
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// unauthorized credit card transactions, etc. |
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if (_isnan(bnd.GetMins().fX) || _isnan(bnd.GetMins().fY)) |
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return false; |
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if (_isnan(bnd.GetMaxs().fX) || _isnan(bnd.GetMaxs().fY)) |
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return false; |
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plConst(hsScalar) kMinMinZ(1.f); |
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if( minZ < kMinMinZ ) |
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minZ = kMinMinZ; |
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if( -bnd.GetMins().fX > bnd.GetMaxs().fX ) |
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{ |
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hsAssert(bnd.GetMins().fX < 0, "Empty shadow caster bounds?"); |
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cotX = -minZ / bnd.GetMins().fX; |
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} |
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else |
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{ |
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hsAssert(bnd.GetMaxs().fX > 0, "Empty shadow caster bounds?"); |
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cotX = minZ / bnd.GetMaxs().fX; |
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} |
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if( -bnd.GetMins().fY > bnd.GetMaxs().fY ) |
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{ |
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hsAssert(bnd.GetMins().fY < 0, "Empty shadow caster bounds?"); |
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cotY = -minZ / bnd.GetMins().fY; |
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} |
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else |
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{ |
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hsAssert(bnd.GetMaxs().fY > 0, "Empty shadow caster bounds?"); |
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cotY = minZ / bnd.GetMaxs().fY; |
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} |
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} |
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hsMatrix44 proj; |
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proj.Reset(); |
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proj.NotIdentity(); |
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// LightToTexture |
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// First the LightToTexture, which uses the above pretty much as is. |
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// Note the remapping to range [0.5..width-0.5] etc. Also, the perspective |
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// divide is by the 3rd output (not the fourth), so we make the 3rd |
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// output be W (instead of Z). |
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// This also means that our translate goes into [i][2] instead of [i][3]. |
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proj.fMap[0][0] = cotX * 0.5f; |
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proj.fMap[0][2] = 0.5f * (1.f + 0.5f/fWidth); |
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proj.fMap[1][1] = -cotY * 0.5f; |
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proj.fMap[1][2] = 0.5f * (1.f + 0.5f/fHeight); |
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#if 1 // This computes correct Z, but we really just want W in 3rd component. HACKFISH |
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proj.fMap[2][2] = maxZ / (maxZ - minZ); |
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proj.fMap[2][3] = -minZ * maxZ / (maxZ - minZ); |
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#elif 1 |
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proj.fMap[2][2] = 1.f; |
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proj.fMap[2][3] = 0; |
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#endif |
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proj.fMap[3][2] = 1.f; |
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proj.fMap[3][3] = 0; |
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// fWorldToTexture = proj * camNDC2Li * pipeView.GetWorldToNDC(); |
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fWorldToTexture = proj * camNDC2Li * world2NDC; |
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fWorldToTexture.fMap[2][0] = fWorldToTexture.fMap[3][0]; |
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fWorldToTexture.fMap[2][1] = fWorldToTexture.fMap[3][1]; |
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fWorldToTexture.fMap[2][2] = fWorldToTexture.fMap[3][2]; |
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fWorldToTexture.fMap[2][3] = fWorldToTexture.fMap[3][3]; |
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// Now the LightToNDC. This one's a little trickier, because we want to compensate for |
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// having brought in the viewport to keep our border constant, so we can clamp the |
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// projected texture and not have the edges smear off to infinity. |
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cotX -= cotX / (fWidth * 0.5f); |
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cotY -= cotY / (fHeight * 0.5f); |
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hsScalar tanX = 1.f / cotX; |
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hsScalar tanY = 1.f / cotY; |
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fView.SetScreenSize((UInt16)fWidth, (UInt16)fHeight); |
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fView.SetCameraTransform(pipe->GetViewTransform().GetWorldToCamera(), pipe->GetViewTransform().GetCameraToWorld()); |
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fView.SetPerspective(true); |
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fView.SetViewPort(0, 0, (float)fWidth, (float)fHeight, false); |
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fView.SetView(hsPoint3(-tanX, -tanY, minZ), hsPoint3(tanX, tanY, maxZ)); |
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hsMatrix44 cam2Light = camNDC2Li * pipeView.GetCameraToNDC(); |
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fView.PostMultCameraToNDC(cam2Light); |
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fLightPos = fLightToWorld.GetTranslate(); |
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SetFlag(kPositional, false); |
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return true; |
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} |
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static inline hsVector3 CrossProd(const hsVector3& a, const hsPoint3& b) |
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{ |
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return hsVector3(a.fY*b.fZ - a.fZ*b.fY, a.fZ*b.fX - a.fX*b.fZ, a.fX*b.fY - a.fY*b.fX); |
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} |
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static inline void InverseOfPureRotTran(const hsMatrix44& src, hsMatrix44& inv) |
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{ |
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inv = src; |
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// We know this is a pure rotation and translation matrix, so |
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// we won't have to do a full inverse. Okay kids, don't try this |
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// at home. |
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inv.fMap[0][1] = src.fMap[1][0]; |
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inv.fMap[0][2] = src.fMap[2][0]; |
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inv.fMap[1][0] = src.fMap[0][1]; |
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inv.fMap[1][2] = src.fMap[2][1]; |
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inv.fMap[2][0] = src.fMap[0][2]; |
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inv.fMap[2][1] = src.fMap[1][2]; |
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hsPoint3 newTran(-src.fMap[0][3], -src.fMap[1][3], -src.fMap[2][3]); |
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inv.fMap[0][3] = newTran.InnerProduct((hsVector3*)&inv.fMap[0][0]); |
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inv.fMap[1][3] = newTran.InnerProduct((hsVector3*)&inv.fMap[1][0]); |
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inv.fMap[2][3] = newTran.InnerProduct((hsVector3*)&inv.fMap[2][0]); |
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} |
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void plPerspDirSlave::IComputeCamNDCToLight(const hsPoint3& from, const hsPoint3& at, hsMatrix44& camNDC2Li, hsMatrix44& li2CamNDC) |
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{ |
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hsVector3 atToFrom(&from, &at); |
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hsScalar distSq = atToFrom.MagnitudeSquared(); |
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atToFrom *= hsFastMath::InvSqrtAppr(distSq); |
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const hsScalar kMinMag = 0.5f; |
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hsVector3 up(0,0,1.f); |
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if( CrossProd(up, (at - from)).MagnitudeSquared() < kMinMag ) |
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{ |
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up.Set(0, 1.f, 0); |
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} |
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hsMatrix44 w2light; |
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w2light.MakeCamera(&from, &at, &up); |
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hsMatrix44 light2w; |
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InverseOfPureRotTran(w2light, light2w); |
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#ifdef CHECK_INVERSE |
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hsMatrix44 inv; |
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w2light.GetInverse(&inv); |
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#endif // CHECK_INVERSE |
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camNDC2Li = w2light; |
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li2CamNDC = light2w; |
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} |