pcsx2/plugins/GSdx/res/merge.fx

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

Texture2D Texture;
SamplerState Sampler;

cbuffer cb0
{
	float4 BGColor;
};

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

float4 ps_main0(PS_INPUT input) : SV_Target0
{
	float4 c = Texture.Sample(Sampler, input.t);
	c.a *= 2.0f;
	return c;
}

float4 ps_main1(PS_INPUT input) : SV_Target0
{
	float4 c = Texture.Sample(Sampler, input.t);
	c.a = BGColor.a;
	return c;
}
#endif