VP_Flood.cg

/*
Guodong Rong

VP_Flood.cg
The vertex program for JFA

Copyright (c) 2005-2006 
School of Computing
National University of Singapore
All Rights Reserved.
*/

void main(float4 position  : POSITION,

		  out float4 oPosition        : POSITION,
		  out float4 oNeighborCoord01 : TEXCOORD0,
		  out float4 oNeighborCoord23 : TEXCOORD1,
		  out float4 oNeighborCoord56 : TEXCOORD2,
		  out float4 oNeighborCoord78 : TEXCOORD3,

	 	  uniform float4x4 cameraModelViewProj : state.matrix.mvp,
		  uniform float2 size,
		  uniform int steplength)
{
	float4 pos4;

	oPosition = mul(cameraModelViewProj, position);

	pos4 = float4(position.xy, position.xy);

	oNeighborCoord01 = pos4 + float4(-steplength, -steplength, 0, -steplength);
	oNeighborCoord23 = pos4 + float4(steplength, -steplength, -steplength, 0);
	oNeighborCoord56 = pos4 + float4(steplength, 0, -steplength, steplength);
	oNeighborCoord78 = pos4 + float4(0, steplength, steplength, steplength);
} // main