!!ARBvp1.0

ATTRIB	normal  = vertex.normal;
ATTRIB	tangent = vertex.attrib[0];

PARAM	mvp[4]  = {state.matrix.mvp};
PARAM	camera  = program.env[0];
PARAM	light   = program.env[1];

TEMP	bitangent, vdir, ldir, temp;

# Transform vertex
DP4	result.position.x, mvp[0], vertex.position;
DP4	result.position.y, mvp[1], vertex.position;
DP4	result.position.z, mvp[2], vertex.position;
DP4	result.position.w, mvp[3], vertex.position;

# B = (N x T) * T.w
XPD	bitangent, normal, tangent;
MUL	bitangent, bitangent, tangent.w;

# Calculate normalized V and L
ADD	vdir, camera, -vertex.position;
ADD	ldir, light, -vertex.position;
DP3	temp.x, vdir, vdir;
DP3	temp.y, ldir, ldir;
RSQ	temp.x, temp.x;
RSQ	temp.y, temp.y;
MUL	vdir, vdir, temp.x;
MUL	ldir, ldir, temp.y;

# Transform into tangent space
DP3	result.texcoord[1].x, tangent, vdir;
DP3	result.texcoord[1].y, bitangent, vdir;
DP3	result.texcoord[1].z, normal, vdir;
DP3	result.texcoord[2].x, tangent, ldir;
DP3	result.texcoord[2].y, bitangent, ldir;
DP3	result.texcoord[2].z, normal, ldir;
END