!!ARBvp1.0

# Vertex program use for applying shadow textures.  2D texture coordinates
# are generated from vertex coordinates using the s and t texture planes.
# A second texture is used as a mask to keep shadows from showing on the
# wrong side of the object.

ATTRIB iPos          = vertex.position;
ATTRIB iTex0         = vertex.texcoord[0];
PARAM  mvp[4]        = { state.matrix.mvp };
PARAM  lightDir      = program.env[0];
PARAM  texgen_s      = program.env[10];
PARAM  texgen_t      = program.env[11];
PARAM  halfW         = { 0, 0, 0, 0.5 };
OUTPUT oPos          = result.position;
OUTPUT oTex0         = result.texcoord[0];
OUTPUT oTex1         = result.texcoord[1];

TEMP   t;

# Transform the vertex by the modelview matrix
DP4   oPos.x, mvp[0], iPos;
DP4   oPos.y, mvp[1], iPos;
DP4   oPos.z, mvp[2], iPos;
DP4   oPos.w, mvp[3], iPos;

# Generate texture coordinates
DP4   oTex0.x, texgen_s, iPos;
DP4   oTex0.y, texgen_t, iPos;

# Generate 1D coordinates for the 'mask' texture
ADD   t, lightDir, halfW;
DP4   oTex1.x, t, iPos;
MOV   oTex1.y, halfW.x;

END

