obs-StreamFX/data/effects/mip-mapper.effect

uniform matrix4 ViewProj;

uniform texture2d image;
uniform float2 imageTexel;
uniform int layer;

sampler_state textureSampler {
	Filter    = Point;
	AddressU  = Clamp;
	AddressV  = Clamp;
};

struct VertDataIn {
	float4 pos : POSITION;
	float2 uv  : TEXCOORD0;
};

struct VertDataOut {
	float4 pos : POSITION;
	float2 uv  : TEXCOORD0;
};

VertDataOut VSDefault(VertDataIn v_in)
{
	VertDataOut vert_out;
	vert_out.pos = mul(float4(v_in.pos.xyz, 1.0), ViewProj);
	vert_out.uv  = v_in.uv;
	return vert_out;
}

float4 PSAverage(VertDataOut v_in) : TARGET
{
	float4 rgba = 0;
	for (float x = -1; x <= 1; x++) {
		for (float y = -1; y <= 1; y++) {
			rgba += image.Sample(textureSampler, v_in.uv + vec2(x,y) * imageTexel + imageTexel);
		}
	}
	return rgba / 9.0;
}

technique Draw
{
	pass
	{
		vertex_shader = VSDefault(v_in);
		pixel_shader  = PSAverage(v_in);
	}
}