llviewerjointmesh_vec.cpp

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//-----------------------------------------------------------------------------
// Header Files
//-----------------------------------------------------------------------------
#include "llviewerprecompiledheaders.h"

#include "llviewerjointmesh.h"

#include "llface.h"
#include "llpolymesh.h"
#include "llv4math.h"
#include "llv4matrix3.h"
#include "llv4matrix4.h"

// Generic vectorized code, uses compiler defaults, works well for Altivec
// on PowerPC.

// static
void LLViewerJointMesh::updateGeometryVectorized(LLFace *face, LLPolyMesh *mesh)
{
        static LLV4Matrix4      sJointMat[32];
        LLDynamicArray<LLJointRenderData*>& joint_data = mesh->getReferenceMesh()->mJointRenderData;
        S32 j, joint_num, joint_end = joint_data.count();
        LLV4Vector3 pivot;

        //upload joint pivots/matrices
        for(j = joint_num = 0; joint_num < joint_end ; ++joint_num )
        {
                LLSkinJoint *sj;
                const LLMatrix4 *       wm = joint_data[joint_num]->mWorldMatrix;
                if (NULL == (sj = joint_data[joint_num]->mSkinJoint))
                {
                                sj = joint_data[++joint_num]->mSkinJoint;
                                ((LLV4Matrix3)(sJointMat[j] = *wm)).multiply(sj->mRootToParentJointSkinOffset, pivot);
                                sJointMat[j++].translate(pivot);
                                wm = joint_data[joint_num]->mWorldMatrix;
                }
                ((LLV4Matrix3)(sJointMat[j] = *wm)).multiply(sj->mRootToJointSkinOffset, pivot);
                sJointMat[j++].translate(pivot);
        }

        F32                                     weight          = F32_MAX;
        LLV4Matrix4                     blend_mat;

        LLStrider<LLVector3> o_vertices;
        LLStrider<LLVector3> o_normals;

        LLVertexBuffer *buffer = face->mVertexBuffer;
        buffer->getVertexStrider(o_vertices,  mesh->mFaceVertexOffset);
        buffer->getNormalStrider(o_normals,   mesh->mFaceVertexOffset);

        const F32*                      weights                 = mesh->getWeights();
        const LLVector3*        coords                  = mesh->getCoords();
        const LLVector3*        normals                 = mesh->getNormals();
        for (U32 index = 0, index_end = mesh->getNumVertices(); index < index_end; ++index)
        {
                if( weight != weights[index])
                {
                        S32 joint = llfloor(weight = weights[index]);
                        blend_mat.lerp(sJointMat[joint], sJointMat[joint+1], weight - joint);
                }
                blend_mat.multiply(coords[index], o_vertices[index]);
                ((LLV4Matrix3)blend_mat).multiply(normals[index], o_normals[index]);
        }
}

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