76 lines
2.1 KiB
GLSL
76 lines
2.1 KiB
GLSL
/**
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* @file objectSkinV.glsl
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* $LicenseInfo:firstyear=2007&license=viewerlgpl$
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* Second Life Viewer Source Code
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* Copyright (C) 2007, Linden Research, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation;
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* version 2.1 of the License only.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
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* $/LicenseInfo$
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*/
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#define FLT_MAX 3.402823466e+38
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ATTRIBUTE vec4 weight4;
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uniform mat3x4 matrixPalette[52];
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uniform float maxWeight;
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mat4 getObjectSkinnedTransform()
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{
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int i;
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vec4 w = fract(weight4);
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vec4 index = floor(weight4);
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index = min(index, vec4(maxWeight));
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index = max(index, vec4( 0.0));
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float sum = (w.x+w.y+w.z+w.w);
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if(sum > 0.0)
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w*=1.0/sum;
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else
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w=vec4(FLT_MAX);
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int i1 = int(index.x);
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int i2 = int(index.y);
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int i3 = int(index.z);
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int i4 = int(index.w);
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mat3 mat = mat3(matrixPalette[i1])*w.x;
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mat += mat3(matrixPalette[i2])*w.y;
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mat += mat3(matrixPalette[i3])*w.z;
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mat += mat3(matrixPalette[i4])*w.w;
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vec3 trans = vec3(matrixPalette[i1][0].w,matrixPalette[i1][1].w,matrixPalette[i1][2].w)*w.x;
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trans += vec3(matrixPalette[i2][0].w,matrixPalette[i2][1].w,matrixPalette[i2][2].w)*w.y;
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trans += vec3(matrixPalette[i3][0].w,matrixPalette[i3][1].w,matrixPalette[i3][2].w)*w.z;
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trans += vec3(matrixPalette[i4][0].w,matrixPalette[i4][1].w,matrixPalette[i4][2].w)*w.w;
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mat4 ret;
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ret[0] = vec4(mat[0], 0);
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ret[1] = vec4(mat[1], 0);
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ret[2] = vec4(mat[2], 0);
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ret[3] = vec4(trans, 1.0);
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return ret;
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}
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