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/**
* @file llskinningutil.cpp
* @brief Functions for mesh object skinning
* @author vir@lindenlab.com
*
* $LicenseInfo:firstyear=2015&license=viewerlgpl$
* Second Life Viewer Source Code
* Copyright (C) 2015, Linden Research, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License only.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
* $/LicenseInfo$
*/
#include "llviewerprecompiledheaders.h"
#include "llskinningutil.h"
#include "llvoavatar.h"
#include "llviewercontrol.h"
#include "llmeshrepository.h"
// static
void LLSkinningUtil::initClass()
{
}
// static
U32 LLSkinningUtil::getMaxJointCount()
{
U32 result = LL_MAX_JOINTS_PER_MESH_OBJECT;
return result;
}
// static
U32 LLSkinningUtil::getMeshJointCount(const LLMeshSkinInfo *skin)
{
return llmin((U32)getMaxJointCount(), (U32)skin->mJointNames.size());
}
// static
void LLSkinningUtil::scrubInvalidJoints(LLVOAvatar *avatar, LLMeshSkinInfo* skin)
{
if (skin->mInvalidJointsScrubbed)
{
return;
}
for (U32 j = 0; j < skin->mJointNames.size(); ++j)
{
// Fix invalid names to "mPelvis". Currently meshes with
// invalid names will be blocked on upload, so this is just
// needed for handling of any legacy bad data.
if (!avatar->getJoint(skin->mJointNames[j]))
{
skin->mJointNames[j] = "mPelvis";
}
}
skin->mInvalidJointsScrubbed = true;
}
// static
void LLSkinningUtil::initSkinningMatrixPalette(
LLMatrix4* mat,
S32 count,
const LLMeshSkinInfo* skin,
LLVOAvatar *avatar)
{
for (U32 j = 0; j < count; ++j)
{
LLJoint *joint = NULL;
if (skin->mJointNums[j] == -1)
{
joint = avatar->getJoint(skin->mJointNames[j]);
if (joint)
{
skin->mJointNums[j] = joint->getJointNum();
}
}
else
{
joint = avatar->getJoint(skin->mJointNums[j]);
}
if (joint)
{
#define MAT_USE_SSE
#ifdef MAT_USE_SSE
LLMatrix4a bind, world, res;
bind.loadu(skin->mInvBindMatrix[j]);
world.loadu(joint->getWorldMatrix());
matMul(bind,world,res);
memcpy(mat[j].mMatrix,res.mMatrix,16*sizeof(float));
#else
mat[j] = skin->mInvBindMatrix[j];
mat[j] *= joint->getWorldMatrix();
#endif
}
else
{
mat[j] = skin->mInvBindMatrix[j];
// This shouldn't happen - in mesh upload, skinned
// rendering should be disabled unless all joints are
// valid. In other cases of skinned rendering, invalid
// joints should already have been removed during scrubInvalidJoints().
LL_WARNS_ONCE("Avatar") << "Rigged to invalid joint name " << skin->mJointNames[j] << LL_ENDL;
}
}
}
// static
void LLSkinningUtil::checkSkinWeights(LLVector4a* weights, U32 num_vertices, const LLMeshSkinInfo* skin)
{
#ifndef LL_RELEASE_FOR_DOWNLOAD
const S32 max_joints = skin->mJointNames.size();
for (U32 j=0; j<num_vertices; j++)
{
F32 *w = weights[j].getF32ptr();
F32 wsum = 0.0;
for (U32 k=0; k<4; ++k)
{
S32 i = llfloor(w[k]);
llassert(i>=0);
llassert(i<max_joints);
wsum += w[k]-i;
}
llassert(wsum > 0.0f);
}
#endif
}
// static
void LLSkinningUtil::getPerVertexSkinMatrix(
F32* weights,
LLMatrix4a* mat,
bool handle_bad_scale,
LLMatrix4a& final_mat,
U32 max_joints)
{
bool valid_weights = true;
final_mat.clear();
S32 idx[4];
LLVector4 wght;
F32 scale = 0.f;
for (U32 k = 0; k < 4; k++)
{
F32 w = weights[k];
// BENTO potential optimizations
// - Do clamping in unpackVolumeFaces() (once instead of every time)
// - int vs floor: if we know w is
// >= 0.0, we can use int instead of floorf; the latter
// allegedly has a lot of overhead due to ieeefp error
// checking which we should not need.
idx[k] = llclamp((S32) floorf(w), (S32)0, (S32)max_joints-1);
wght[k] = w - floorf(w);
scale += wght[k];
}
if (handle_bad_scale && scale <= 0.f)
{
wght = LLVector4(1.0f, 0.0f, 0.0f, 0.0f);
valid_weights = false;
}
else
{
// This is enforced in unpackVolumeFaces()
llassert(scale>0.f);
wght *= 1.f/scale;
}
for (U32 k = 0; k < 4; k++)
{
F32 w = wght[k];
LLMatrix4a src;
src.setMul(mat[idx[k]], w);
final_mat.add(src);
}
// SL-366 - with weight validation/cleanup code, it should no longer be
// possible to hit the bad scale case.
llassert(valid_weights);
}
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