!!ARBvp1.0

#   NURBSurface.vsh

#

#  Created by Michael Larson on Tue Mar 11 2003.

#  Copyright (c) 2003 Apple Computer. All rights reserved.

#

# 

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ATTRIB  uBasis      = vertex.position;

ATTRIB  vBasis      = vertex.color;

ATTRIB  vTexcoord   = vertex.texcoord;

PARAM   negOne  = {-1.000000000000, -1.000000000000, -1.000000000000, -1.000000000000};

PARAM   zero    = {0.0000000000000, 0.0000000000000, 0.0000000000000, 1.0000000000000};

PARAM   one = {1.0000000000000, 1.0000000000000, 1.0000000000000, 1.0000000000000};

PARAM   ptOne   = {0.1000000000000, 0.1000000000000, 0.1000000000000, 0.1000000000000};

PARAM   ptTwo   = {0.2000000000000, 0.2000000000000, 0.2000000000000, 0.2000000000000};

PARAM   ptFive  = {0.5000000000000, 0.5000000000000, 0.5000000000000, 0.5000000000000};

# Position Control grid

PARAM   P00     = program.local[0];

PARAM   P01     = program.local[1];

PARAM   P02     = program.local[2];

PARAM   P03     = program.local[3];

PARAM   P10     = program.local[4];

PARAM   P11     = program.local[5];

PARAM   P12     = program.local[6];

PARAM   P13     = program.local[7];

PARAM   P20     = program.local[8];

PARAM   P21     = program.local[9];

PARAM   P22     = program.local[10];

PARAM   P23     = program.local[11];

PARAM   P30     = program.local[12];

PARAM   P31     = program.local[13];

PARAM   P32     = program.local[14];

PARAM   P33     = program.local[15];

TEMP    P;

TEMP    M0, M1, M2, M3;

###########################################################################################

# Row 0

MUL M0, uBasis.xxxx, vBasis.xxxx;   # Create 4 column basis funcitons from K[0]J[0..3]

MUL M1, uBasis.yyyy, vBasis.xxxx;

MUL M2, uBasis.zzzz, vBasis.xxxx;

MUL M3, uBasis.wwww, vBasis.xxxx;

MUL P, M0, P00;         # Start evaluating P from control points and basis functions

MAD P, M1, P01, P;          # Multiply and accumulate as we go

MAD P, M2, P02, P;

MAD P, M3, P03, P;

# Row 1

MUL M0, uBasis.xxxx, vBasis.yyyy;   # New row, notice change in vBasis to vBasis[1]

MUL M1, uBasis.yyyy, vBasis.yyyy;

MUL M2, uBasis.zzzz, vBasis.yyyy;

MUL M3, uBasis.wwww, vBasis.yyyy;

MAD P, M0, P10, P;

MAD P, M1, P11, P;

MAD P, M2, P12, P;

MAD P, M3, P13, P;

# Row 2

MUL M0, uBasis.xxxx, vBasis.zzzz;

MUL M1, uBasis.yyyy, vBasis.zzzz;

MUL M2, uBasis.zzzz, vBasis.zzzz;

MUL M3, uBasis.wwww, vBasis.zzzz;

MAD P, M0, P20, P;

MAD P, M1, P21, P;

MAD P, M2, P22, P;

MAD P, M3, P23, P;

# Row 3

MUL M0, uBasis.xxxx, vBasis.wwww;

MUL M1, uBasis.yyyy, vBasis.wwww;

MUL M2, uBasis.zzzz, vBasis.wwww;

MUL M3, uBasis.wwww, vBasis.wwww;

MAD P, M0, P30, P;

MAD P, M1, P31, P;

MAD P, M2, P32, P;

MAD P, M3, P33, P;

#SWZ    P, P, x,y,z,1;

# Transform the vertex by the modelview/projection matrix

DP4    result.position.x, state.matrix.mvp.row[0], P;

DP4    result.position.y, state.matrix.mvp.row[1], P;

DP4    result.position.z, state.matrix.mvp.row[2], P;

DP4    result.position.w, state.matrix.mvp.row[3], P;

MOV    result.texcoord, vTexcoord;

END