xash3d-fwgs/ref/vk/shaders/denoiser.comp

#version 460

#include "noise.glsl"
#include "utils.glsl"
#include "color_spaces.glsl"

#define GLSL
#include "ray_interop.h"
#undef GLSL

layout(local_size_x = 8, local_size_y = 8, local_size_z = 1) in;

layout(set = 0, binding = 0, rgba16f) uniform image2D out_dest;

layout(set = 0, binding = 1, rgba8) uniform readonly image2D base_color_a;

layout(set = 0, binding = 2, rgba16f) uniform readonly image2D light_poly_diffuse;
layout(set = 0, binding = 3, rgba16f) uniform readonly image2D light_poly_specular;

layout(set = 0, binding = 4, rgba16f) uniform readonly image2D light_point_diffuse;
layout(set = 0, binding = 5, rgba16f) uniform readonly image2D light_point_specular;
layout(set = 0, binding = 6, rgba16f) uniform readonly image2D emissive;

layout(set = 0, binding = 7, rgba32f) uniform readonly image2D position_t;
layout(set = 0, binding = 8, rgba16f) uniform readonly image2D normals_gs;
layout(set = 0, binding = 10, rgba32f) uniform readonly image2D geometry_prev_position;

layout(set = 0, binding = 11) uniform UBO { UniformBuffer ubo; } ubo;

layout(set = 0, binding = 12, rgba16f) uniform readonly image2D indirect_diffuse;
layout(set = 0, binding = 13, rgba16f) uniform readonly image2D indirect_specular;

layout(set = 0, binding = 14, rgba16f) uniform image2D out_temporal_diffuse;
layout(set = 0, binding = 15, rgba16f) uniform image2D prev_temporal_diffuse;

layout(set = 0, binding = 16, rgba16f) uniform image2D out_temporal_specular;
layout(set = 0, binding = 17, rgba16f) uniform image2D prev_temporal_specular;

//#define DEBUG_NOISE
#ifdef DEBUG_NOISE
layout(set = 0, binding = 18) uniform sampler3D blue_noise_texture;
#include "bluenoise.glsl"
#endif

//layout(set = 0, binding = 19) uniform sampler2D textures[MAX_TEXTURES];
//layout(set = 0, binding = 18, rgba8) uniform readonly image2D material_rmxx;


const int INDIRECT_SCALE = 2;

// Blatantly copypasted from https://www.shadertoy.com/view/XsGfWV
vec3 aces_tonemap(vec3 color){
	mat3 m1 = mat3(
		0.59719, 0.07600, 0.02840,
		0.35458, 0.90834, 0.13383,
		0.04823, 0.01566, 0.83777
	);
	mat3 m2 = mat3(
		1.60475, -0.10208, -0.00327,
		-0.53108,  1.10813, -0.07276,
		-0.07367, -0.00605,  1.07602
	);
	vec3 v = m1 * color;
	vec3 a = v * (v + 0.0245786) - 0.000090537;
	vec3 b = v * (0.983729 * v + 0.4329510) + 0.238081;
	//return pow(clamp(m2 * (a / b), 0.0, 1.0), vec3(1.0 / 2.2));
	return clamp(m2 * (a / b), 0.0, 1.0);
}

vec3 reinhard(vec3 color){
	return color / (color + 1.0);
}

vec3 reinhard02(vec3 c, vec3 Cwhite2) {
	return c * (1. + c / Cwhite2) / (1. + c);
}

float normpdf2(in float x2, in float sigma) { return 0.39894*exp(-0.5*x2/(sigma*sigma))/sigma; }
float normpdf(in float x, in float sigma) { return normpdf2(x*x, sigma); }

void readNormals(ivec2 uv, out vec3 geometry_normal, out vec3 shading_normal) {
	const vec4 n = imageLoad(normals_gs, uv);
	geometry_normal = normalDecode(n.xy);
	shading_normal = normalDecode(n.zw);
}

struct Components {
	vec3 direct_diffuse, direct_specular, indirect_diffuse, indirect_specular;
};

Components blurSamples(const ivec2 res, const ivec2 pix) {
	Components c;
	c.direct_diffuse = c.direct_specular = c.indirect_diffuse = c.indirect_specular = vec3(0.);

	const vec4 center_pos = imageLoad(position_t, pix);

	const int DIRECT_DIFFUSE_KERNEL = 3;
	const int INDIRECT_DIFFUSE_KERNEL = 5;
	const int SPECULAR_KERNEL = 2;
	const int KERNEL_SIZE = max(max(DIRECT_DIFFUSE_KERNEL, INDIRECT_DIFFUSE_KERNEL), SPECULAR_KERNEL);

	const float direct_diffuse_sigma = DIRECT_DIFFUSE_KERNEL / 2.;
	const float indirect_diffuse_sigma = INDIRECT_DIFFUSE_KERNEL / 2.;
	const float specular_sigma = SPECULAR_KERNEL / 2.;

	float direct_diffuse_total = 0.;
	float indirect_diffuse_total = 0.;
	float specular_total = 0.;

	const ivec2 res_scaled = res / INDIRECT_SCALE;
	for (int x = -KERNEL_SIZE; x <= KERNEL_SIZE; ++x)
		for (int y = -KERNEL_SIZE; y <= KERNEL_SIZE; ++y) {
			const ivec2 p = pix + ivec2(x, y);
			if (any(greaterThanEqual(p, res)) || any(lessThan(p, ivec2(0)))) {
				continue;
			}

			vec3 sample_geometry_normal, sample_shading_normal;
			readNormals(p, sample_geometry_normal, sample_shading_normal);

			float scale = 1.f;
			// FIXME also filter by depth, (kusok index?), etc
			//scale *= smoothstep(.9, 1., dot(sample_geometry_normal, geometry_normal));

			const vec4 sample_pos = imageLoad(position_t, p);
			// FIXME what are these magic numbers?
			scale *= smoothstep(center_pos.w * 4. / 100., 0., distance(center_pos.xyz, sample_pos.xyz));

			if ( scale <= 0. )
				continue;

			if (all(lessThan(abs(ivec2(x, y)), ivec2(DIRECT_DIFFUSE_KERNEL))))
			{
				const float direct_diffuse_scale = scale * normpdf(x, direct_diffuse_sigma) * normpdf(y, direct_diffuse_sigma);
				direct_diffuse_total += direct_diffuse_scale;

				c.direct_diffuse += imageLoad(light_point_diffuse, p).rgb * direct_diffuse_scale;
				c.direct_diffuse += imageLoad(light_poly_diffuse, p).rgb * direct_diffuse_scale;
			}

			if (all(lessThan(abs(ivec2(x, y)), ivec2(INDIRECT_DIFFUSE_KERNEL))))
			{
				const ivec2 pscaled = pix / INDIRECT_SCALE + ivec2(x, y);

				if (all(lessThan(pscaled, res_scaled)) && all(greaterThanEqual(pscaled, ivec2(0)))) {
					const float indirect_diffuse_scale = scale * normpdf(x, indirect_diffuse_sigma) * normpdf(y, indirect_diffuse_sigma);
					indirect_diffuse_total += indirect_diffuse_scale;

					c.indirect_diffuse += imageLoad(indirect_diffuse, pscaled).rgb * indirect_diffuse_scale;
				}
			}

			if (all(lessThan(abs(ivec2(x, y)), ivec2(SPECULAR_KERNEL))))
			{
				const float specular_scale = scale * normpdf(x, specular_sigma) * normpdf(y, specular_sigma);
				specular_total += specular_scale;

				c.direct_specular += imageLoad(light_poly_specular, p).rgb * specular_scale;
				c.direct_specular += imageLoad(light_point_specular, p).rgb * specular_scale;

				c.indirect_specular += imageLoad(indirect_specular, p / INDIRECT_SCALE).rgb * specular_scale;
			}
		}

	if (direct_diffuse_total > 0.)
		c.direct_diffuse /= direct_diffuse_total;

	if (indirect_diffuse_total > 0.)
		c.indirect_diffuse *= indirect_diffuse_total;

	if (specular_total > 0.) {
		c.direct_specular *= specular_total;
		c.indirect_specular *= specular_total;
	}

	return c;
}

void main() {
	ivec2 res = ivec2(imageSize(base_color_a));
	ivec2 pix = ivec2(gl_GlobalInvocationID);

	if (any(greaterThanEqual(pix, res))) {
		return;
	}

	if (ubo.ubo.debug_display_only == DEBUG_DISPLAY_DISABLED) {
		// no-op, just continue
	} else if (ubo.ubo.debug_display_only == DEBUG_DISPLAY_BASECOLOR) {
		imageStore(out_dest, pix, vec4(LINEARtoSRGB(imageLoad(base_color_a, pix).rgb), 0.)); return;
		return;
	} else if (ubo.ubo.debug_display_only == DEBUG_DISPLAY_BASEALPHA) {
		imageStore(out_dest, pix, imageLoad(base_color_a, pix).aaaa); return;
		return;
	} else if (ubo.ubo.debug_display_only == DEBUG_DISPLAY_EMISSIVE) {
		imageStore(out_dest, pix, vec4(LINEARtoSRGB(imageLoad(emissive, pix).rgb), 0.)); return;
		return;
	} else if (ubo.ubo.debug_display_only == DEBUG_DISPLAY_NSHADE) {
		vec3 geometry_normal, shading_normal;
		readNormals(pix, geometry_normal, shading_normal);
		imageStore(out_dest, pix, vec4(.5 + shading_normal * .5, 0.));
		return;
	} else if (ubo.ubo.debug_display_only == DEBUG_DISPLAY_NGEOM) {
		vec3 geometry_normal, shading_normal;
		readNormals(pix, geometry_normal, shading_normal);
		imageStore(out_dest, pix, vec4(.5 + geometry_normal * .5, 0.));
		return;
	}

#ifdef DEBUG_NOISE
	imageStore(out_dest, pix, blueNoise(ivec3(pix.xy, ubo.ubo.frame_counter))); return;
#endif

	const Components c = blurSamples(res, pix);

	vec3 colour = vec3(0.);
	{
		// TODO: need to extract reprojecting from this shader because reprojected stuff need svgf denoising pass after it
		const vec3 origin = (ubo.ubo.inv_view * vec4(0., 0., 0., 1.)).xyz;
		const vec3 position = imageLoad(position_t, pix).xyz;
		const float depth = length(origin - position);
		const vec3 prev_position = imageLoad(geometry_prev_position, pix).rgb;
		const vec4 clip_space = inverse(ubo.ubo.prev_inv_proj) * vec4((inverse(ubo.ubo.prev_inv_view) * vec4(prev_position, 1.)).xyz, 1.);
		const vec2 reproj_uv = clip_space.xy / clip_space.w;
		const ivec2 reproj_pix = ivec2((reproj_uv * 0.5 + vec2(0.5)) * vec2(res));
		const vec3 prev_origin = (ubo.ubo.prev_inv_view * vec4(0., 0., 0., 1.)).xyz;
		const float depth_nessesary = length(prev_position - prev_origin);
		const float depth_treshold = 0.01 * clip_space.w;

		float better_depth_offset = depth_treshold;
		vec3 diffuse = c.direct_diffuse + c.indirect_diffuse;
		vec3 specular = c.direct_specular + c.indirect_specular;
		vec3 history_diffuse = diffuse;
		vec3 history_specular = specular;
		const int TEMPORAL_KERNEL = 1; // lifekilled says it should be fixed
		for(int x = -TEMPORAL_KERNEL; x <=TEMPORAL_KERNEL; x++) {
			for(int y = -TEMPORAL_KERNEL; y <=TEMPORAL_KERNEL; y++) {
				const ivec2 p = reproj_pix + ivec2(x, y);
				if (any(greaterThanEqual(p, res)) || any(lessThan(p, ivec2(0)))) {
					continue;
				}
				const vec4 history_diffuse_depth = imageLoad( prev_temporal_diffuse, reproj_pix );
				const vec4 history_specular_sample = imageLoad( prev_temporal_specular, reproj_pix );

				const float history_depth = history_diffuse_depth.w;
				const float depth_offset = abs(history_depth - depth_nessesary);
				if ( depth_offset < better_depth_offset ) {
					better_depth_offset = depth_offset;
					history_diffuse = history_diffuse_depth.rgb;
					history_specular = history_specular_sample.rgb;
				}
			}
		}
		if (better_depth_offset < depth_treshold) {
			diffuse = mix(diffuse, history_diffuse, 0.8);
			specular = mix(specular, history_specular, 0.3);
		}

		imageStore(out_temporal_diffuse, pix, vec4(diffuse, depth));
		imageStore(out_temporal_specular, pix, vec4(specular, 0./*unused*/));
		colour = diffuse + specular;
	}

	if (ubo.ubo.debug_display_only != DEBUG_DISPLAY_LIGHTING) {
		const vec4 base_color_a = SRGBtoLINEAR(imageLoad(base_color_a, pix));
		colour *= base_color_a.rgb;
	}
	colour += imageLoad(emissive, pix).rgb;
	colour = LINEARtoSRGB(colour);

	imageStore(out_dest, pix, vec4(colour, 0./*unused*/));
}