lighting vp.txt

it is a visual c++ file

!!ARBvp1.0
# Vertex Program for simple lighting

# Parameters
PARAM mvp[4]		= { state.matrix.mvp };		#modelview projection matrix
PARAM modelview[4]	= { state.matrix.modelview };			#modelview matrix
PARAM iTModelview[4]= { state.matrix.modelview.invtrans };	#inverse transpose modelview matrix

PARAM globalAmbient = state.lightmodel.ambient;	#global ambient level
PARAM lightAmbient	= state.light[1].ambient;	#light ambient color
PARAM lightDiffuse	= state.light[1].diffuse;	#light diffuse color
PARAM lightSpecular	= state.light[1].specular;	#light specular color
PARAM lightPosition = state.light[1].position;	#light position

PARAM shininess		= state.material.shininess;	#shininess
PARAM materialSpecular=state.material.specular;	#material specular color

# Per vertex inputs
ATTRIB iPos			= vertex.position;			#position
ATTRIB iNorm		= vertex.normal;			#normal
ATTRIB iCol0		= vertex.color;				#primary color

# Temporaries
TEMP eyeSpacePosition;	#eye space vertex position

TEMP lightVector;		#light vector(eye space)
TEMP normLightVector;	#Normalized light vector(eye space)
TEMP eyeVector;			#eye space eye vector
TEMP normEyeVector;		#Normalized eye vector(eye space)
TEMP halfVector;		#half vector(eye space)
TEMP normHalfVector;	#Normalized half vector(eye space)
TEMP eyeSpaceNormal;	#eye space normal

TEMP dots;				#dot products for lighting
TEMP tempColor;			#Used to calculate final color
TEMP tempSpecular;		#Used to calculate specular color

# Outputs
OUTPUT oPos			= result.position;			#position
OUTPUT oCol0		= result.color;				#primary color




# project to clip coords
DP4 oPos.x, mvp[0], iPos;
DP4 oPos.y, mvp[1], iPos;
DP4 oPos.z, mvp[2], iPos;
DP4 oPos.w, mvp[3], iPos;



#Convert position to eye space
DP4 eyeSpacePosition.x, modelview[0], iPos;
DP4 eyeSpacePosition.y, modelview[1], iPos;
DP4 eyeSpacePosition.z, modelview[2], iPos;
DP4 eyeSpacePosition.w, modelview[3], iPos;

#Calculate eye vector (-eye space position)
MOV eyeVector, -eyeSpacePosition;

#Normalize eye vector
DP3 normEyeVector.w, eyeVector, eyeVector;
RSQ normEyeVector.w, normEyeVector.w;
MUL normEyeVector.xyz, normEyeVector.w, eyeVector;





#Calculate light vector
SUB lightVector, lightPosition, eyeSpacePosition;

#Normalize light vector
DP3 normLightVector.w, lightVector, lightVector;
RSQ normLightVector.w, normLightVector.w;
MUL normLightVector.xyz, normLightVector.w, lightVector;





#Calculate half vector
ADD halfVector, normLightVector, normEyeVector;

#Normalize half vector
DP3 normHalfVector.w, halfVector, halfVector;
RSQ normHalfVector.w, normHalfVector.w;
MUL normHalfVector.xyz, normHalfVector.w, halfVector;





#Convert normal to eye space
DP3 eyeSpaceNormal.x, iTModelview[0], iNorm;
DP3 eyeSpaceNormal.y, iTModelview[1], iNorm;
DP3 eyeSpaceNormal.z, iTModelview[2], iNorm;


#Fill in light dot products
#dots.x=l dot n
DP3 dots.x, normLightVector, eyeSpaceNormal;

#dots.y=h dot n
DP3 dots.y, normHalfVector, eyeSpaceNormal;

#dots.w=shininess
MOV dots.w, shininess.x;

#Calculate lighting coefficients
LIT dots, dots;


#Accumulate final color
#tempColor=col0*(lDotN*diffuse+ambient+globalAmbient)
MAD tempColor, dots.y, lightDiffuse, lightAmbient;
ADD tempColor, tempColor, globalAmbient;
MUL tempColor, tempColor, iCol0;

#tempSpecular=lDotH*lightSpecular*materialSpecular
MUL tempSpecular, dots.z, lightSpecular;
MUL tempSpecular, tempSpecular, materialSpecular;

#tempColor+=tempSpecular
ADD tempColor, tempColor, tempSpecular;

#Output as color
MOV oCol0, tempColor;

END