#include "shared.effect"

uniform texture2D InputA<
	bool automatic = true;
>;
uniform texture2D InputB<
	bool automatic = true;
>;

//------------------------------------------------------------------------------
// Technique: Draw
//------------------------------------------------------------------------------
// Parameters:
// - InputA: RGBA Texture

float4 PSDraw(VertexData vtx) : TARGET {
	return InputA.Sample(BlankSampler, vtx.uv);
};

technique Draw
{
	pass
	{
		vertex_shader = DefaultVertexShader(vtx);
		pixel_shader = PSDraw(vtx);
	};
};

//------------------------------------------------------------------------------
// Technique: Draw
//------------------------------------------------------------------------------
// Parameters:
// - InputA: RGBA Texture

float4 PSDrawPremultiplied(VertexData vtx) : TARGET {
	float4 rgba = InputA.Sample(BlankSampler, vtx.uv);
	rgba.rgb /= rgba.a > (1. / 1024.) ? rgba.a : 1.0;
	return rgba;
};

technique DrawPremultiplied
{
	pass
	{
		vertex_shader = DefaultVertexShader(vtx);
		pixel_shader = PSDrawPremultiplied(vtx);
	};
};

//------------------------------------------------------------------------------
// Technique: Restore Alpha
//------------------------------------------------------------------------------
// Parameters:
// - InputA: RGBX Texture
// - InputB: XXXA Texture

float4 PSRestoreAlpha(VertexData vtx) : TARGET {
	float4 rgbx = InputA.Sample(BlankSampler, vtx.uv);
	float4 xxxa = InputB.Sample(BlankSampler, vtx.uv);
	rgbx.a = xxxa.a;
	return rgbx;
};

technique RestoreAlpha
{
	pass
	{
		vertex_shader = DefaultVertexShader(vtx);
		pixel_shader = PSRestoreAlpha(vtx);
	};
};