#ifdef SHADER_MODEL // make safe to include in resource file to enforce dependency

#ifndef PS_SCALE_FACTOR
#define PS_SCALE_FACTOR 1
#endif

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

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

cbuffer cb0 : register(b0)
{
	float4 u_source_rect;
	float4 u_target_rect;
	float2 u_source_size;
	float2 u_target_size;
	float2 u_target_resolution;
	float2 u_rcp_target_resolution; // 1 / u_target_resolution
	float2 u_source_resolution;
	float2 u_rcp_source_resolution; // 1 / u_source_resolution
	float u_time;
	float3 cb0_pad0;
};

Texture2D Texture;
SamplerState TextureSampler;

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

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

struct PS_OUTPUT
{
	float4 c : SV_Target0;
};

VS_OUTPUT vs_main(VS_INPUT input)
{
	VS_OUTPUT output;

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

	return output;
}

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

	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);
}

PS_OUTPUT ps_filter_scanlines(PS_INPUT input)
{
	PS_OUTPUT output;
	
	uint4 p = (uint4)input.p;

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

	return output;
}

PS_OUTPUT ps_filter_diagonal(PS_INPUT input)
{
	PS_OUTPUT output;

	uint4 p = (uint4)input.p;

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

	return output;
}

PS_OUTPUT ps_filter_triangular(PS_INPUT input)
{
	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_filter_complex(PS_INPUT input) // triangular
{
	PS_OUTPUT output;

	float2 texdim, halfpixel; 
	Texture.GetDimensions(texdim.x, texdim.y); 
	if (ddy(input.t.y) * input.t.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;
}

#endif