float4x4 matWorldViewProj;
float4x4 matWorld;
float4x4 matViewProj;
float4x4 matView;
float4x4 matProj;
float4 vecViewPos;
float4 vecViewDir;
float4 vecViewPort;

texture bmp_camera_bmap;
texture bmp_depth_bmap;

sampler CameraSampler = sampler_state 
{ 
	Texture = <bmp_camera_bmap>; 
	AddressU  = border; 
	AddressV  = border; 
}; 

sampler DepthSampler = sampler_state 
{ 
	Texture = <bmp_depth_bmap>; 
	AddressU  = Clamp; 
	AddressV  = Clamp; 
}; 

// Vertex Shader: 
void ReflectVS( 
in float4 InPos    : POSITION, 
in float3 InNormal : NORMAL, 
in float2 InTex    : TEXCOORD0, 

out float2 OutTex   : TEXCOORD0, 
out float3 OutNormal: TEXCOORD1,
out float3 wPos     : TEXCOORD2,
out float4 OutPos   : TEXCOORD3,
out float4 pPos     : POSITION

) 
{ 
	pPos = mul(InPos, matWorldViewProj);
	OutPos = pPos;
	
	OutNormal = normalize(mul(InNormal, matWorld));
	
	OutTex = InTex; 
	
	wPos = mul(InPos, matWorld);
} 

float2 calc_ScreenPos(float4 pPos)
{
	return (float2(pPos.x,-pPos.y)/pPos.w+vecViewPort.zw)*0.5+0.5;
}

// Pixel Shader: 
void ReflectPS( 
in float2 Tex    : TEXCOORD0, 
in float3 Normal : TEXCOORD1,
in float3 wPos   : TEXCOORD2,
in float4 pPos   : TEXCOORD3,

out float4 COL : COLOR0
)
{ 
	Normal = normalize(Normal);
	float3 View = normalize(vecViewPos.xyz - wPos);
	
	float3 R = -reflect(View, Normal);
	float3 sR = mul(R, matView);
	sR = R;
	
	float2 sTex = calc_ScreenPos(pPos);
	
	//--------------//
	const float srel = vecViewPort.y/vecViewPort.x;
	
	//	float2 PomOffDir=sR.xy*0.05;//*vecViewPort.zw;
	//	//	PomOffDir = sR.xy/-sR.z*0.1;
	//	PomOffDir.y *= -1.f;
	//	PomOffDir.y *= srel;
	
	//	float PomOff=IntersectionTest(DepthSampler, sTex, PomOffDir, 0.0f);
	//	sTex+=PomOffDir*PomOff;

	float3 screenPos = float3(sTex.xy, pPos.w);
	screenPos.xy = mul(float4(wPos, 1), matView).xy;
	screenPos = wPos;
	
	float3 screenDir = sR;

	//	screenDir.y *= -1.f;
	screenDir = normalize(screenDir);
	//	screenDir.xy /= abs(screenDir.z);

	const int step_count = 32;
	const float init_step_size = 20.f;
	
	int halve_again = 0;
	float step_size = init_step_size;
	float depth;
	float2 sUV;

	float3 oldPos = screenPos;
	float3 newPos = screenPos + screenDir * step_size;

	for(int i=0; i<step_count; ++i)
	{
		sUV = calc_ScreenPos(mul(float4(newPos, 1.f), matViewProj));
		depth = tex2Dlod(DepthSampler, float4(sUV,0,0)).x;
		
		if(dot(vecViewDir, newPos-vecViewPos.xyz) < depth)
		//		if(newPos.z < depth)
		{
			oldPos = newPos;
			
			if(halve_again)
			step_size *= 0.5f;
			halve_again = 0;
			
			newPos += screenDir * step_size;
		}
		else
		{
			step_size *= 0.5f;
			newPos = oldPos + screenDir * step_size;
			//			step_size *= 0.5f;
			halve_again = 1;
		}
	}

	sUV = calc_ScreenPos(mul(float4(newPos, 1.f), matViewProj));
	depth = tex2Dlod(DepthSampler, float4(sUV,0,0)).x;

	//	if(dot(vecViewDir, newPos-vecViewPos.xyz) < depth)
	//	if(newPos.z < depth)
	if(step_size == init_step_size)
	{
		COL = 0;
		return;	
	}
	//--------------//
	
	COL = tex2D(CameraSampler, sUV);
	
	//	COL.rgb = dot(vecViewDir, wPos-vecViewPos.xyz)*0.01f;
	//	COL = tex2D(CameraSampler, calc_ScreenPos(mul(float4(newPos, 1.f), matProj)));
	//	COL = tex2D(CameraSampler, calc_ScreenPos(mul(float4(screenPos, 1.f), matProj)));
	//		COL = tex2D(CameraSampler, sTex);
	//	COL = tex2D(DepthSampler, sTex).x*0.0005;
	//		COL = float4(sR.xy, 0, 1);
	//		COL.rgb = screenDir.z;
	//		COL.rgb = sR.z;
	//		COL.rgb = mul(float4(R,0), matViewProj).z;
	//		COL.rgb = abs(screenDir);
	//COL.rgb = mul(R, matView).z;
	//COL.rgb=mul(float4(wPos, 1), matView).y;
	//COL.rgb=pPos.w*0.01f;
	COL.a = 1;
} 

technique ReflectTechnique 
{ 
	pass P0 
	{ 
		VertexShader = compile vs_3_0 ReflectVS(); 
		PixelShader  = compile ps_3_0 ReflectPS(); 
	} 
}