VP_DrawSitesOQ.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 float  oConverged	  : TEXCOORD0,
//		  out float4 test		  : TEXCOORD1,

	 	  uniform float4x4 cameraModelViewProj : state.matrix.mvp,
	 	  uniform samplerRECT siteTex      : TEXUNIT0,
	 	  uniform samplerRECT processedTex : TEXUNIT1,
		  uniform float2 size)
{
	int i, j;
	float4 pos, target_pos, stored_pos;
	float2 posRECT, error;
	
	pos = mul(cameraModelViewProj, position);
	posRECT = position;

	target_pos = texRECT(siteTex, posRECT);
	target_pos.xy /= target_pos.w;

	stored_pos = texRECT(processedTex, int2(target_pos)+float2(0.5, 0.5));	
	
	error = int2(target_pos.xy)-int2(stored_pos.xy);
	
	float threshold = 0.5;
	
	if (abs(error.x)<threshold && abs(error.y)<threshold)
		oConverged = 1.0;
	else
		oConverged = 0.0;
	
	oPosition = pos;
	
//	test = float4(target_pos.xy, stored_pos.xy);
} // main