matrix/shaders/wgsl/blur1D.wgsl

[[block]] struct Config {
	bloomStrength : f32;
	direction : vec2<f32>;
};

[[group(0), binding(0)]] var<uniform> config : Config;
[[group(0), binding(1)]] var nearestSampler : sampler;
[[group(0), binding(2)]] var tex : texture_2d<f32>;
[[group(0), binding(3)]] var outputTex : texture_storage_2d<rgba8unorm, write>;

struct ComputeInput {
	[[builtin(global_invocation_id)]] id : vec3<u32>;
};

[[stage(compute), workgroup_size(32, 1, 1)]] fn computeMain(input : ComputeInput) {

	var coord = vec2<i32>(input.id.xy);
	var outputSize = textureDimensions(outputTex);

	if (coord.x >= outputSize.x) {
		return;
	}

	var uv = (vec2<f32>(coord) + 0.5) / vec2<f32>(outputSize);
	var offset = config.direction / vec2<f32>(outputSize);
	var sum = vec4<f32>(0.0);

	sum = sum + textureSampleLevel( tex, nearestSampler, uv + offset *  3.0, 0.0 ) * 0.006;
	sum = sum + textureSampleLevel( tex, nearestSampler, uv + offset *  2.0, 0.0 ) * 0.061;
	sum = sum + textureSampleLevel( tex, nearestSampler, uv + offset *  1.0, 0.0 ) * 0.242;
	sum = sum + textureSampleLevel( tex, nearestSampler, uv + offset *  0.0, 0.0 ) * 0.383;
	sum = sum + textureSampleLevel( tex, nearestSampler, uv + offset * -1.0, 0.0 ) * 0.242;
	sum = sum + textureSampleLevel( tex, nearestSampler, uv + offset * -2.0, 0.0 ) * 0.061;
	sum = sum + textureSampleLevel( tex, nearestSampler, uv + offset * -3.0, 0.0 ) * 0.006;

	textureStore(outputTex, coord, sum * config.bloomStrength);
}