#ifdef SHADER_MODEL // make safe to include in resource file to enforce dependency
#if SHADER_MODEL >= 0x400

#ifndef PS_SCALE_FACTOR
#define PS_SCALE_FACTOR 1
#endif

struct VS_INPUT
{
	float4 p : POSITION;
	float2 t : TEXCOORD0;
};

struct VS_OUTPUT
{
	float4 p : SV_Position;
	float2 t : TEXCOORD0;
};

Texture2D Texture;
SamplerState TextureSampler;

float4 sample_c(float2 uv)
{
	return Texture.Sample(TextureSampler, uv);
}

struct PS_INPUT
{
	float4 p : SV_Position;
	float2 t : TEXCOORD0;
};

struct PS_OUTPUT
{
	float4 c : SV_Target0;
};

#elif SHADER_MODEL <= 0x300

struct VS_INPUT
{
	float4 p : POSITION;
	float2 t : TEXCOORD0;
};

struct VS_OUTPUT
{
	float4 p : POSITION;
	float2 t : TEXCOORD0;
};

struct PS_INPUT
{
#if SHADER_MODEL < 0x300
	float4 p : TEXCOORD1;
#else
	float4 p : VPOS;
#endif
	float2 t : TEXCOORD0;
};

struct PS_OUTPUT
{
	float4 c : COLOR;
};

sampler Texture : register(s0);

float4 sample_c(float2 uv)
{
	return tex2D(Texture, uv);
}

#endif

VS_OUTPUT vs_main(VS_INPUT input)
{
	VS_OUTPUT output;

	output.p = input.p;
	output.t = input.t;

	return output;
}

PS_OUTPUT ps_main0(PS_INPUT input)
{
	PS_OUTPUT output;
	
	output.c = sample_c(input.t);

	return output;
}

PS_OUTPUT ps_main7(PS_INPUT input)
{
	PS_OUTPUT output;
	
	float4 c = sample_c(input.t);
	
	c.a = dot(c.rgb, float3(0.299, 0.587, 0.114));

	output.c = c;

	return output;
}

float4 ps_crt(PS_INPUT input, int i)
{
	float4 mask[4] = 
	{
		float4(1, 0, 0, 0), 
		float4(0, 1, 0, 0), 
		float4(0, 0, 1, 0), 
		float4(1, 1, 1, 0)
	};
	
	return sample_c(input.t) * saturate(mask[i] + 0.5f);
}

float4 ps_scanlines(PS_INPUT input, int i)
{
	float4 mask[2] =
	{
		float4(1, 1, 1, 0),
		float4(0, 0, 0, 0)
	};

	return sample_c(input.t) * saturate(mask[i] + 0.5f);
}

#if SHADER_MODEL >= 0x400

uint ps_main1(PS_INPUT input) : SV_Target0
{
	float4 c = sample_c(input.t);

	c.a *= 256.0f / 127; // hm, 0.5 won't give us 1.0 if we just multiply with 2

	uint4 i = c * float4(0x001f, 0x03e0, 0x7c00, 0x8000);

	return (i.x & 0x001f) | (i.y & 0x03e0) | (i.z & 0x7c00) | (i.w & 0x8000);	
}

PS_OUTPUT ps_main2(PS_INPUT input)
{
	PS_OUTPUT output;
	
	clip(sample_c(input.t).a - 127.5f / 255); // >= 0x80 pass
	
	output.c = 0;

	return output;
}

PS_OUTPUT ps_main3(PS_INPUT input)
{
	PS_OUTPUT output;
	
	clip(127.5f / 255 - sample_c(input.t).a); // < 0x80 pass (== 0x80 should not pass)
	
	output.c = 0;

	return output;
}

PS_OUTPUT ps_main4(PS_INPUT input)
{
	PS_OUTPUT output;
	
	output.c = fmod(sample_c(input.t) * 255 + 0.5f, 256) / 255;

	return output;
}

PS_OUTPUT ps_main5(PS_INPUT input) // scanlines
{
	PS_OUTPUT output;
	
	uint4 p = (uint4)input.p;

	output.c = ps_scanlines(input, p.y % 2);

	return output;
}

PS_OUTPUT ps_main6(PS_INPUT input) // diagonal
{
	PS_OUTPUT output;

	uint4 p = (uint4)input.p;

	output.c = ps_crt(input, (p.x + (p.y % 3)) % 3);

	return output;
}

PS_OUTPUT ps_main8(PS_INPUT input) // triangular
{
	PS_OUTPUT output;

	uint4 p = (uint4)input.p;

	// output.c = ps_crt(input, ((p.x + (p.y & 1) * 3) >> 1) % 3); 
	output.c = ps_crt(input, ((p.x + ((p.y >> 1) & 1) * 3) >> 1) % 3);

	return output;
}

static const float PI = 3.14159265359f;
PS_OUTPUT ps_main9(PS_INPUT input) // triangular
{
	PS_OUTPUT output;

	float2 texdim, halfpixel; 
	Texture.GetDimensions(texdim.x, texdim.y); 
	if (ddy(input.t.y) * texdim.y > 0.5) 
		output.c = sample_c(input.t); 
	else
		output.c = (0.9 - 0.4 * cos(2 * PI * input.t.y * texdim.y)) * sample_c(float2(input.t.x, (floor(input.t.y * texdim.y) + 0.5) / texdim.y));

	return output;
}

// DUMMY SHADERS START
PS_OUTPUT ps_main10(PS_INPUT input)
{
	PS_OUTPUT output;

	output.c = input.p;

	return output;
}

PS_OUTPUT ps_main11(PS_INPUT input)
{
	PS_OUTPUT output;

	output.c = input.p;

	return output;
}

PS_OUTPUT ps_main12(PS_INPUT input)
{
	PS_OUTPUT output;

	output.c = input.p;

	return output;
}

PS_OUTPUT ps_main13(PS_INPUT input)
{
	PS_OUTPUT output;

	output.c = input.p;

	return output;
}

PS_OUTPUT ps_main14(PS_INPUT input)
{
	PS_OUTPUT output;

	output.c = input.p;

	return output;
}

PS_OUTPUT ps_main15(PS_INPUT input)
{
	PS_OUTPUT output;

	output.c = input.p;

	return output;
}

PS_OUTPUT ps_main16(PS_INPUT input)
{
	PS_OUTPUT output;

	output.c = input.p;

	return output;
}
// DUMMY SHADERS END

PS_OUTPUT ps_main17(PS_INPUT input)
{
	PS_OUTPUT output;

	// Potential speed optimization. There is a high probability that
	// game only want to extract a single channel (blue). It will allow
	// to remove most of the conditional operation and yield a +2/3 fps
	// boost on MGS3
	//
	// Hypothesis wrong in Prince of Persia ... Seriously WTF !
	//#define ONLY_BLUE;

	// Convert a RGBA texture into a 8 bits packed texture
	// Input column: 8x2 RGBA pixels
	// 0: 8 RGBA
	// 1: 8 RGBA
	// Output column: 16x4 Index pixels
	// 0: 8 R | 8 B
	// 1: 8 R | 8 B
	// 2: 8 G | 8 A
	// 3: 8 G | 8 A
	float c;

	uint2 sel = uint2(input.p.xy) % uint2(16u, 16u);
	int2  tb  = ((int2(input.p.xy) & ~int2(15, 3)) >> 1);

	int ty   = tb.y | (int(input.p.y) & 1);
	int txN  = tb.x | (int(input.p.x) & 7);
	int txH  = tb.x | ((int(input.p.x) + 4) & 7);

	txN *= PS_SCALE_FACTOR;
	txH *= PS_SCALE_FACTOR;
	ty  *= PS_SCALE_FACTOR;

	// TODO investigate texture gather
	float4 cN = Texture.Load(int3(txN, ty, 0));
	float4 cH = Texture.Load(int3(txH, ty, 0));


	if ((sel.y & 4u) == 0u)
	{
#ifdef ONLY_BLUE
		c = cN.b;
#else
		// Column 0 and 2
		if ((sel.y & 3u) < 2u)
		{
			// First 2 lines of the col
			if (sel.x < 8u)
				c = cN.r;
			else
				c = cN.b;
		}
		else
		{
			if (sel.x < 8u)
				c = cH.g;
			else
				c = cH.a;
		}
#endif
	}
	else
	{
#ifdef ONLY_BLUE
		c = cH.b;
#else
		// Column 1 and 3
		if ((sel.y & 3u) < 2u)
		{
			// First 2 lines of the col
			if (sel.x < 8u)
				c = cH.r;
			else
				c = cH.b;
		}
		else
		{
			if (sel.x < 8u)
				c = cN.g;
			else
				c = cN.a;
		}
#endif
	}

	output.c = (float4)(c); // Divide by something here?

	return output;
}

#elif SHADER_MODEL <= 0x300

PS_OUTPUT ps_main1(PS_INPUT input)
{
	PS_OUTPUT output;
	
	float4 c = sample_c(input.t);
	
	c.a *= 128.0f / 255; // *= 0.5f is no good here, need to do this in order to get 0x80 for 1.0f (instead of 0x7f)
	
	output.c = c;

	return output;
}

PS_OUTPUT ps_main2(PS_INPUT input)
{
	PS_OUTPUT output;
	
	clip(sample_c(input.t).a - 255.0f / 255); // >= 0x80 pass
	
	output.c = 0;

	return output;
}

PS_OUTPUT ps_main3(PS_INPUT input)
{
	PS_OUTPUT output;
	
	clip(254.95f / 255 - sample_c(input.t).a); // < 0x80 pass (== 0x80 should not pass)
	
	output.c = 0;

	return output;
}

PS_OUTPUT ps_main4(PS_INPUT input)
{
	PS_OUTPUT output;
	
	output.c = 1;
	
	return output;
}

PS_OUTPUT ps_main5(PS_INPUT input) // scanlines
{
	PS_OUTPUT output;
	
	int4 p = (int4)input.p;

	output.c = ps_scanlines(input, p.y % 2);

	return output;
}

PS_OUTPUT ps_main6(PS_INPUT input) // diagonal
{
	PS_OUTPUT output;

	int4 p = (int4)input.p;

	output.c = ps_crt(input, (p.x + (p.y % 3)) % 3);

	return output;
}

PS_OUTPUT ps_main8(PS_INPUT input) // triangular
{
	PS_OUTPUT output;

	int4 p = (int4)input.p;

	// output.c = ps_crt(input, ((p.x + (p.y % 2) * 3) / 2) % 3);
	output.c = ps_crt(input, ((p.x + ((p.y / 2) % 2) * 3) / 2) % 3);

	return output;
}

static const float PI = 3.14159265359f;
PS_OUTPUT ps_main9(PS_INPUT input) // triangular
{
	PS_OUTPUT output;

	// Needs DX9 conversion
	/*float2 texdim, halfpixel; 
	Texture.GetDimensions(texdim.x, texdim.y); 
	if (ddy(input.t.y) * texdim.y > 0.5) 
		output.c = sample_c(input.t); 
	else
		output.c = (0.5 - 0.5 * cos(2 * PI * input.t.y * texdim.y)) * sample_c(float2(input.t.x, (floor(input.t.y * texdim.y) + 0.5) / texdim.y));
*/

	// replacement shader
	int4 p = (int4)input.p;
	output.c = ps_crt(input, ((p.x + ((p.y / 2) % 2) * 3) / 2) % 3);

	return output;
}

#endif
#endif