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virtualx-engine/servers/rendering/renderer_rd/shaders/volumetric_fog_process.glsl
Hendrik Brucker 1da732af35 Fix volumetric fog in combination with spotlights
2021-12-08 22:17:09 +01:00

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#[compute]
#version 450
#VERSION_DEFINES
/* Do not use subgroups here, seems there is not much advantage and causes glitches
#if defined(has_GL_KHR_shader_subgroup_ballot) && defined(has_GL_KHR_shader_subgroup_arithmetic)
#extension GL_KHR_shader_subgroup_ballot: enable
#extension GL_KHR_shader_subgroup_arithmetic: enable
#define USE_SUBGROUPS
#endif
*/
#ifdef MODE_DENSITY
layout(local_size_x = 4, local_size_y = 4, local_size_z = 4) in;
#else
layout(local_size_x = 8, local_size_y = 8, local_size_z = 1) in;
#endif
#include "cluster_data_inc.glsl"
#include "light_data_inc.glsl"
#define M_PI 3.14159265359
#define DENSITY_SCALE 1024.0
layout(set = 0, binding = 1) uniform texture2D shadow_atlas;
layout(set = 0, binding = 2) uniform texture2D directional_shadow_atlas;
layout(set = 0, binding = 3, std430) restrict readonly buffer OmniLights {
LightData data[];
}
omni_lights;
layout(set = 0, binding = 4, std430) restrict readonly buffer SpotLights {
LightData data[];
}
spot_lights;
layout(set = 0, binding = 5, std140) uniform DirectionalLights {
DirectionalLightData data[MAX_DIRECTIONAL_LIGHT_DATA_STRUCTS];
}
directional_lights;
layout(set = 0, binding = 6, std430) buffer restrict readonly ClusterBuffer {
uint data[];
}
cluster_buffer;
layout(set = 0, binding = 7) uniform sampler linear_sampler;
#ifdef MODE_DENSITY
layout(rgba16f, set = 0, binding = 8) uniform restrict writeonly image3D density_map;
layout(rgba16f, set = 0, binding = 9) uniform restrict readonly image3D fog_map; //unused
#endif
#ifdef MODE_FOG
layout(rgba16f, set = 0, binding = 8) uniform restrict readonly image3D density_map;
layout(rgba16f, set = 0, binding = 9) uniform restrict writeonly image3D fog_map;
#endif
#ifdef MODE_COPY
layout(rgba16f, set = 0, binding = 8) uniform restrict readonly image3D source_map;
layout(rgba16f, set = 0, binding = 9) uniform restrict writeonly image3D dest_map;
#endif
#ifdef MODE_FILTER
layout(rgba16f, set = 0, binding = 8) uniform restrict readonly image3D source_map;
layout(rgba16f, set = 0, binding = 9) uniform restrict writeonly image3D dest_map;
#endif
layout(set = 0, binding = 10) uniform sampler shadow_sampler;
#define MAX_VOXEL_GI_INSTANCES 8
struct VoxelGIData {
mat4 xform;
vec3 bounds;
float dynamic_range;
float bias;
float normal_bias;
bool blend_ambient;
uint texture_slot;
float anisotropy_strength;
float ambient_occlusion;
float ambient_occlusion_size;
uint mipmaps;
};
layout(set = 0, binding = 11, std140) uniform VoxelGIs {
VoxelGIData data[MAX_VOXEL_GI_INSTANCES];
}
voxel_gi_instances;
layout(set = 0, binding = 12) uniform texture3D voxel_gi_textures[MAX_VOXEL_GI_INSTANCES];
layout(set = 0, binding = 13) uniform sampler linear_sampler_with_mipmaps;
#ifdef ENABLE_SDFGI
// SDFGI Integration on set 1
#define SDFGI_MAX_CASCADES 8
struct SDFVoxelGICascadeData {
vec3 position;
float to_probe;
ivec3 probe_world_offset;
float to_cell; // 1/bounds * grid_size
};
layout(set = 1, binding = 0, std140) uniform SDFGI {
vec3 grid_size;
uint max_cascades;
bool use_occlusion;
int probe_axis_size;
float probe_to_uvw;
float normal_bias;
vec3 lightprobe_tex_pixel_size;
float energy;
vec3 lightprobe_uv_offset;
float y_mult;
vec3 occlusion_clamp;
uint pad3;
vec3 occlusion_renormalize;
uint pad4;
vec3 cascade_probe_size;
uint pad5;
SDFVoxelGICascadeData cascades[SDFGI_MAX_CASCADES];
}
sdfgi;
layout(set = 1, binding = 1) uniform texture2DArray sdfgi_ambient_texture;
layout(set = 1, binding = 2) uniform texture3D sdfgi_occlusion_texture;
#endif //SDFGI
layout(set = 0, binding = 14, std140) uniform Params {
vec2 fog_frustum_size_begin;
vec2 fog_frustum_size_end;
float fog_frustum_end;
float ambient_inject;
float z_far;
int filter_axis;
vec3 ambient_color;
float sky_contribution;
ivec3 fog_volume_size;
uint directional_light_count;
vec3 base_emission;
float base_density;
vec3 base_scattering;
float phase_g;
float detail_spread;
float gi_inject;
uint max_voxel_gi_instances;
uint cluster_type_size;
vec2 screen_size;
uint cluster_shift;
uint cluster_width;
uint max_cluster_element_count_div_32;
bool use_temporal_reprojection;
uint temporal_frame;
float temporal_blend;
mat3x4 cam_rotation;
mat4 to_prev_view;
mat3 radiance_inverse_xform;
}
params;
#ifndef MODE_COPY
layout(set = 0, binding = 15) uniform texture3D prev_density_texture;
#ifdef MOLTENVK_USED
layout(set = 0, binding = 16) buffer density_only_map_buffer {
uint density_only_map[];
};
layout(set = 0, binding = 17) buffer light_only_map_buffer {
uint light_only_map[];
};
layout(set = 0, binding = 18) buffer emissive_only_map_buffer {
uint emissive_only_map[];
};
#else
layout(r32ui, set = 0, binding = 16) uniform uimage3D density_only_map;
layout(r32ui, set = 0, binding = 17) uniform uimage3D light_only_map;
layout(r32ui, set = 0, binding = 18) uniform uimage3D emissive_only_map;
#endif
#ifdef USE_RADIANCE_CUBEMAP_ARRAY
layout(set = 0, binding = 19) uniform textureCubeArray sky_texture;
#else
layout(set = 0, binding = 19) uniform textureCube sky_texture;
#endif
#endif // MODE_COPY
float get_depth_at_pos(float cell_depth_size, int z) {
float d = float(z) * cell_depth_size + cell_depth_size * 0.5; //center of voxels
d = pow(d, params.detail_spread);
return params.fog_frustum_end * d;
}
vec3 hash3f(uvec3 x) {
x = ((x >> 16) ^ x) * 0x45d9f3b;
x = ((x >> 16) ^ x) * 0x45d9f3b;
x = (x >> 16) ^ x;
return vec3(x & 0xFFFFF) / vec3(float(0xFFFFF));
}
float get_omni_attenuation(float dist, float inv_range, float decay) {
float nd = dist * inv_range;
nd *= nd;
nd *= nd; // nd^4
nd = max(1.0 - nd, 0.0);
nd *= nd; // nd^2
return nd * pow(max(dist, 0.0001), -decay);
}
void cluster_get_item_range(uint p_offset, out uint item_min, out uint item_max, out uint item_from, out uint item_to) {
uint item_min_max = cluster_buffer.data[p_offset];
item_min = item_min_max & 0xFFFF;
item_max = item_min_max >> 16;
;
item_from = item_min >> 5;
item_to = (item_max == 0) ? 0 : ((item_max - 1) >> 5) + 1; //side effect of how it is stored, as item_max 0 means no elements
}
uint cluster_get_range_clip_mask(uint i, uint z_min, uint z_max) {
int local_min = clamp(int(z_min) - int(i) * 32, 0, 31);
int mask_width = min(int(z_max) - int(z_min), 32 - local_min);
return bitfieldInsert(uint(0), uint(0xFFFFFFFF), local_min, mask_width);
}
float henyey_greenstein(float cos_theta, float g) {
const float k = 0.0795774715459; // 1 / (4 * PI)
return k * (1.0 - g * g) / (pow(1.0 + g * g - 2.0 * g * cos_theta, 1.5));
}
#define TEMPORAL_FRAMES 16
const vec3 halton_map[TEMPORAL_FRAMES] = vec3[](
vec3(0.5, 0.33333333, 0.2),
vec3(0.25, 0.66666667, 0.4),
vec3(0.75, 0.11111111, 0.6),
vec3(0.125, 0.44444444, 0.8),
vec3(0.625, 0.77777778, 0.04),
vec3(0.375, 0.22222222, 0.24),
vec3(0.875, 0.55555556, 0.44),
vec3(0.0625, 0.88888889, 0.64),
vec3(0.5625, 0.03703704, 0.84),
vec3(0.3125, 0.37037037, 0.08),
vec3(0.8125, 0.7037037, 0.28),
vec3(0.1875, 0.14814815, 0.48),
vec3(0.6875, 0.48148148, 0.68),
vec3(0.4375, 0.81481481, 0.88),
vec3(0.9375, 0.25925926, 0.12),
vec3(0.03125, 0.59259259, 0.32));
void main() {
vec3 fog_cell_size = 1.0 / vec3(params.fog_volume_size);
#ifdef MODE_DENSITY
ivec3 pos = ivec3(gl_GlobalInvocationID.xyz);
if (any(greaterThanEqual(pos, params.fog_volume_size))) {
return; //do not compute
}
#ifdef MOLTENVK_USED
uint lpos = pos.z * params.fog_volume_size.x * params.fog_volume_size.y + pos.y * params.fog_volume_size.x + pos.x;
#endif
vec3 posf = vec3(pos);
//posf += mix(vec3(0.0),vec3(1.0),0.3) * hash3f(uvec3(pos)) * 2.0 - 1.0;
vec3 fog_unit_pos = posf * fog_cell_size + fog_cell_size * 0.5; //center of voxels
uvec2 screen_pos = uvec2(fog_unit_pos.xy * params.screen_size);
uvec2 cluster_pos = screen_pos >> params.cluster_shift;
uint cluster_offset = (params.cluster_width * cluster_pos.y + cluster_pos.x) * (params.max_cluster_element_count_div_32 + 32);
//positions in screen are too spread apart, no hopes for optimizing with subgroups
fog_unit_pos.z = pow(fog_unit_pos.z, params.detail_spread);
vec3 view_pos;
view_pos.xy = (fog_unit_pos.xy * 2.0 - 1.0) * mix(params.fog_frustum_size_begin, params.fog_frustum_size_end, vec2(fog_unit_pos.z));
view_pos.z = -params.fog_frustum_end * fog_unit_pos.z;
view_pos.y = -view_pos.y;
vec4 reprojected_density = vec4(0.0);
float reproject_amount = 0.0;
if (params.use_temporal_reprojection) {
vec3 prev_view = (params.to_prev_view * vec4(view_pos, 1.0)).xyz;
//undo transform into prev view
prev_view.y = -prev_view.y;
//z back to unit size
prev_view.z /= -params.fog_frustum_end;
//xy back to unit size
prev_view.xy /= mix(params.fog_frustum_size_begin, params.fog_frustum_size_end, vec2(prev_view.z));
prev_view.xy = prev_view.xy * 0.5 + 0.5;
//z back to unspread value
prev_view.z = pow(prev_view.z, 1.0 / params.detail_spread);
if (all(greaterThan(prev_view, vec3(0.0))) && all(lessThan(prev_view, vec3(1.0)))) {
//reprojectinon fits
reprojected_density = textureLod(sampler3D(prev_density_texture, linear_sampler), prev_view, 0.0);
reproject_amount = params.temporal_blend;
// Since we can reproject, now we must jitter the current view pos.
// This is done here because cells that can't reproject should not jitter.
fog_unit_pos = posf * fog_cell_size + fog_cell_size * halton_map[params.temporal_frame]; //center of voxels, offset by halton table
screen_pos = uvec2(fog_unit_pos.xy * params.screen_size);
cluster_pos = screen_pos >> params.cluster_shift;
cluster_offset = (params.cluster_width * cluster_pos.y + cluster_pos.x) * (params.max_cluster_element_count_div_32 + 32);
//positions in screen are too spread apart, no hopes for optimizing with subgroups
fog_unit_pos.z = pow(fog_unit_pos.z, params.detail_spread);
view_pos.xy = (fog_unit_pos.xy * 2.0 - 1.0) * mix(params.fog_frustum_size_begin, params.fog_frustum_size_end, vec2(fog_unit_pos.z));
view_pos.z = -params.fog_frustum_end * fog_unit_pos.z;
view_pos.y = -view_pos.y;
}
}
uint cluster_z = uint(clamp((abs(view_pos.z) / params.z_far) * 32.0, 0.0, 31.0));
vec3 total_light = vec3(0.0);
float total_density = params.base_density;
#ifdef MOLTENVK_USED
uint local_density = density_only_map[lpos];
#else
uint local_density = imageLoad(density_only_map, pos).x;
#endif
total_density += float(int(local_density)) / DENSITY_SCALE;
total_density = max(0.0, total_density);
#ifdef MOLTENVK_USED
uint scattering_u = light_only_map[lpos];
#else
uint scattering_u = imageLoad(light_only_map, pos).x;
#endif
vec3 scattering = vec3(scattering_u >> 21, (scattering_u << 11) >> 21, scattering_u % 1024) / vec3(2047.0, 2047.0, 1023.0);
scattering += params.base_scattering * params.base_density;
#ifdef MOLTENVK_USED
uint emission_u = emissive_only_map[lpos];
#else
uint emission_u = imageLoad(emissive_only_map, pos).x;
#endif
vec3 emission = vec3(emission_u >> 21, (emission_u << 11) >> 21, emission_u % 1024) / vec3(511.0, 511.0, 255.0);
emission += params.base_emission * params.base_density;
float cell_depth_size = abs(view_pos.z - get_depth_at_pos(fog_cell_size.z, pos.z + 1));
//compute directional lights
if (total_density > 0.001) {
for (uint i = 0; i < params.directional_light_count; i++) {
vec3 shadow_attenuation = vec3(1.0);
if (directional_lights.data[i].shadow_enabled) {
float depth_z = -view_pos.z;
vec4 pssm_coord;
vec3 shadow_color = directional_lights.data[i].shadow_color1.rgb;
vec3 light_dir = directional_lights.data[i].direction;
vec4 v = vec4(view_pos, 1.0);
float z_range;
if (depth_z < directional_lights.data[i].shadow_split_offsets.x) {
pssm_coord = (directional_lights.data[i].shadow_matrix1 * v);
pssm_coord /= pssm_coord.w;
z_range = directional_lights.data[i].shadow_z_range.x;
} else if (depth_z < directional_lights.data[i].shadow_split_offsets.y) {
pssm_coord = (directional_lights.data[i].shadow_matrix2 * v);
pssm_coord /= pssm_coord.w;
z_range = directional_lights.data[i].shadow_z_range.y;
} else if (depth_z < directional_lights.data[i].shadow_split_offsets.z) {
pssm_coord = (directional_lights.data[i].shadow_matrix3 * v);
pssm_coord /= pssm_coord.w;
z_range = directional_lights.data[i].shadow_z_range.z;
} else {
pssm_coord = (directional_lights.data[i].shadow_matrix4 * v);
pssm_coord /= pssm_coord.w;
z_range = directional_lights.data[i].shadow_z_range.w;
}
float depth = texture(sampler2D(directional_shadow_atlas, linear_sampler), pssm_coord.xy).r;
float shadow = exp(min(0.0, (depth - pssm_coord.z)) * z_range * directional_lights.data[i].shadow_volumetric_fog_fade);
shadow = mix(shadow, 1.0, smoothstep(directional_lights.data[i].fade_from, directional_lights.data[i].fade_to, view_pos.z)); //done with negative values for performance
shadow_attenuation = mix(shadow_color, vec3(1.0), shadow);
}
total_light += shadow_attenuation * directional_lights.data[i].color * directional_lights.data[i].energy * henyey_greenstein(dot(normalize(view_pos), normalize(directional_lights.data[i].direction)), params.phase_g);
}
// Compute light from sky
if (params.ambient_inject > 0.0) {
vec3 isotropic = vec3(0.0);
vec3 anisotropic = vec3(0.0);
if (params.sky_contribution > 0.0) {
float mip_bias = 2.0 + total_density * (MAX_SKY_LOD - 2.0); // Not physically based, but looks nice
vec3 scatter_direction = (params.radiance_inverse_xform * normalize(view_pos)) * sign(params.phase_g);
#ifdef USE_RADIANCE_CUBEMAP_ARRAY
isotropic = texture(samplerCubeArray(sky_texture, linear_sampler_with_mipmaps), vec4(0.0, 1.0, 0.0, mip_bias)).rgb;
anisotropic = texture(samplerCubeArray(sky_texture, linear_sampler_with_mipmaps), vec4(scatter_direction, mip_bias)).rgb;
#else
isotropic = textureLod(samplerCube(sky_texture, linear_sampler_with_mipmaps), vec3(0.0, 1.0, 0.0), mip_bias).rgb;
anisotropic = textureLod(samplerCube(sky_texture, linear_sampler_with_mipmaps), vec3(scatter_direction), mip_bias).rgb;
#endif //USE_RADIANCE_CUBEMAP_ARRAY
}
total_light += mix(params.ambient_color, mix(isotropic, anisotropic, abs(params.phase_g)), params.sky_contribution) * params.ambient_inject;
}
//compute lights from cluster
{ //omni lights
uint cluster_omni_offset = cluster_offset;
uint item_min;
uint item_max;
uint item_from;
uint item_to;
cluster_get_item_range(cluster_omni_offset + params.max_cluster_element_count_div_32 + cluster_z, item_min, item_max, item_from, item_to);
#ifdef USE_SUBGROUPS
item_from = subgroupBroadcastFirst(subgroupMin(item_from));
item_to = subgroupBroadcastFirst(subgroupMax(item_to));
#endif
for (uint i = item_from; i < item_to; i++) {
uint mask = cluster_buffer.data[cluster_omni_offset + i];
mask &= cluster_get_range_clip_mask(i, item_min, item_max);
#ifdef USE_SUBGROUPS
uint merged_mask = subgroupBroadcastFirst(subgroupOr(mask));
#else
uint merged_mask = mask;
#endif
while (merged_mask != 0) {
uint bit = findMSB(merged_mask);
merged_mask &= ~(1 << bit);
#ifdef USE_SUBGROUPS
if (((1 << bit) & mask) == 0) { //do not process if not originally here
continue;
}
#endif
uint light_index = 32 * i + bit;
//if (!bool(omni_omni_lights.data[light_index].mask & draw_call.layer_mask)) {
// continue; //not masked
//}
vec3 light_pos = omni_lights.data[light_index].position;
float d = distance(omni_lights.data[light_index].position, view_pos);
float shadow_attenuation = 1.0;
if (d * omni_lights.data[light_index].inv_radius < 1.0) {
float attenuation = get_omni_attenuation(d, omni_lights.data[light_index].inv_radius, omni_lights.data[light_index].attenuation);
vec3 light = omni_lights.data[light_index].color;
if (omni_lights.data[light_index].shadow_enabled) {
//has shadow
vec4 uv_rect = omni_lights.data[light_index].atlas_rect;
vec2 flip_offset = omni_lights.data[light_index].direction.xy;
vec3 local_vert = (omni_lights.data[light_index].shadow_matrix * vec4(view_pos, 1.0)).xyz;
float shadow_len = length(local_vert); //need to remember shadow len from here
vec3 shadow_sample = normalize(local_vert);
if (shadow_sample.z >= 0.0) {
uv_rect.xy += flip_offset;
}
shadow_sample.z = 1.0 + abs(shadow_sample.z);
vec3 pos = vec3(shadow_sample.xy / shadow_sample.z, shadow_len - omni_lights.data[light_index].shadow_bias);
pos.z *= omni_lights.data[light_index].inv_radius;
pos.xy = pos.xy * 0.5 + 0.5;
pos.xy = uv_rect.xy + pos.xy * uv_rect.zw;
float depth = texture(sampler2D(shadow_atlas, linear_sampler), pos.xy).r;
shadow_attenuation = exp(min(0.0, (depth - pos.z)) / omni_lights.data[light_index].inv_radius * omni_lights.data[light_index].shadow_volumetric_fog_fade);
}
total_light += light * attenuation * shadow_attenuation * henyey_greenstein(dot(normalize(light_pos - view_pos), normalize(view_pos)), params.phase_g);
}
}
}
}
{ //spot lights
uint cluster_spot_offset = cluster_offset + params.cluster_type_size;
uint item_min;
uint item_max;
uint item_from;
uint item_to;
cluster_get_item_range(cluster_spot_offset + params.max_cluster_element_count_div_32 + cluster_z, item_min, item_max, item_from, item_to);
#ifdef USE_SUBGROUPS
item_from = subgroupBroadcastFirst(subgroupMin(item_from));
item_to = subgroupBroadcastFirst(subgroupMax(item_to));
#endif
for (uint i = item_from; i < item_to; i++) {
uint mask = cluster_buffer.data[cluster_spot_offset + i];
mask &= cluster_get_range_clip_mask(i, item_min, item_max);
#ifdef USE_SUBGROUPS
uint merged_mask = subgroupBroadcastFirst(subgroupOr(mask));
#else
uint merged_mask = mask;
#endif
while (merged_mask != 0) {
uint bit = findMSB(merged_mask);
merged_mask &= ~(1 << bit);
#ifdef USE_SUBGROUPS
if (((1 << bit) & mask) == 0) { //do not process if not originally here
continue;
}
#endif
//if (!bool(omni_lights.data[light_index].mask & draw_call.layer_mask)) {
// continue; //not masked
//}
uint light_index = 32 * i + bit;
vec3 light_pos = spot_lights.data[light_index].position;
vec3 light_rel_vec = spot_lights.data[light_index].position - view_pos;
float d = length(light_rel_vec);
float shadow_attenuation = 1.0;
if (d * spot_lights.data[light_index].inv_radius < 1.0) {
float attenuation = get_omni_attenuation(d, spot_lights.data[light_index].inv_radius, spot_lights.data[light_index].attenuation);
vec3 spot_dir = spot_lights.data[light_index].direction;
float scos = max(dot(-normalize(light_rel_vec), spot_dir), spot_lights.data[light_index].cone_angle);
float spot_rim = max(0.0001, (1.0 - scos) / (1.0 - spot_lights.data[light_index].cone_angle));
attenuation *= 1.0 - pow(spot_rim, spot_lights.data[light_index].cone_attenuation);
vec3 light = spot_lights.data[light_index].color;
if (spot_lights.data[light_index].shadow_enabled) {
//has shadow
vec4 uv_rect = spot_lights.data[light_index].atlas_rect;
vec2 flip_offset = spot_lights.data[light_index].direction.xy;
vec3 local_vert = (spot_lights.data[light_index].shadow_matrix * vec4(view_pos, 1.0)).xyz;
float shadow_len = length(local_vert); //need to remember shadow len from here
vec3 shadow_sample = normalize(local_vert);
if (shadow_sample.z >= 0.0) {
uv_rect.xy += flip_offset;
}
shadow_sample.z = 1.0 + abs(shadow_sample.z);
vec3 pos = vec3(shadow_sample.xy / shadow_sample.z, shadow_len - spot_lights.data[light_index].shadow_bias);
pos.z *= spot_lights.data[light_index].inv_radius;
pos.xy = pos.xy * 0.5 + 0.5;
pos.xy = uv_rect.xy + pos.xy * uv_rect.zw;
float depth = texture(sampler2D(shadow_atlas, linear_sampler), pos.xy).r;
shadow_attenuation = exp(min(0.0, (depth - pos.z)) / spot_lights.data[light_index].inv_radius * spot_lights.data[light_index].shadow_volumetric_fog_fade);
}
total_light += light * attenuation * shadow_attenuation * henyey_greenstein(dot(normalize(light_rel_vec), normalize(view_pos)), params.phase_g);
}
}
}
}
vec3 world_pos = mat3(params.cam_rotation) * view_pos;
for (uint i = 0; i < params.max_voxel_gi_instances; i++) {
vec3 position = (voxel_gi_instances.data[i].xform * vec4(world_pos, 1.0)).xyz;
//this causes corrupted pixels, i have no idea why..
if (all(bvec2(all(greaterThanEqual(position, vec3(0.0))), all(lessThan(position, voxel_gi_instances.data[i].bounds))))) {
position /= voxel_gi_instances.data[i].bounds;
vec4 light = vec4(0.0);
for (uint j = 0; j < voxel_gi_instances.data[i].mipmaps; j++) {
vec4 slight = textureLod(sampler3D(voxel_gi_textures[i], linear_sampler_with_mipmaps), position, float(j));
float a = (1.0 - light.a);
light += a * slight;
}
light.rgb *= voxel_gi_instances.data[i].dynamic_range * params.gi_inject;
total_light += light.rgb;
}
}
//sdfgi
#ifdef ENABLE_SDFGI
{
float blend = -1.0;
vec3 ambient_total = vec3(0.0);
for (uint i = 0; i < sdfgi.max_cascades; i++) {
vec3 cascade_pos = (world_pos - sdfgi.cascades[i].position) * sdfgi.cascades[i].to_probe;
if (any(lessThan(cascade_pos, vec3(0.0))) || any(greaterThanEqual(cascade_pos, sdfgi.cascade_probe_size))) {
continue; //skip cascade
}
vec3 base_pos = floor(cascade_pos);
ivec3 probe_base_pos = ivec3(base_pos);
vec4 ambient_accum = vec4(0.0);
ivec3 tex_pos = ivec3(probe_base_pos.xy, int(i));
tex_pos.x += probe_base_pos.z * sdfgi.probe_axis_size;
for (uint j = 0; j < 8; j++) {
ivec3 offset = (ivec3(j) >> ivec3(0, 1, 2)) & ivec3(1, 1, 1);
ivec3 probe_posi = probe_base_pos;
probe_posi += offset;
// Compute weight
vec3 probe_pos = vec3(probe_posi);
vec3 probe_to_pos = cascade_pos - probe_pos;
vec3 trilinear = vec3(1.0) - abs(probe_to_pos);
float weight = trilinear.x * trilinear.y * trilinear.z;
// Compute lightprobe occlusion
if (sdfgi.use_occlusion) {
ivec3 occ_indexv = abs((sdfgi.cascades[i].probe_world_offset + probe_posi) & ivec3(1, 1, 1)) * ivec3(1, 2, 4);
vec4 occ_mask = mix(vec4(0.0), vec4(1.0), equal(ivec4(occ_indexv.x | occ_indexv.y), ivec4(0, 1, 2, 3)));
vec3 occ_pos = clamp(cascade_pos, probe_pos - sdfgi.occlusion_clamp, probe_pos + sdfgi.occlusion_clamp) * sdfgi.probe_to_uvw;
occ_pos.z += float(i);
if (occ_indexv.z != 0) { //z bit is on, means index is >=4, so make it switch to the other half of textures
occ_pos.x += 1.0;
}
occ_pos *= sdfgi.occlusion_renormalize;
float occlusion = dot(textureLod(sampler3D(sdfgi_occlusion_texture, linear_sampler), occ_pos, 0.0), occ_mask);
weight *= max(occlusion, 0.01);
}
// Compute ambient texture position
ivec3 uvw = tex_pos;
uvw.xy += offset.xy;
uvw.x += offset.z * sdfgi.probe_axis_size;
vec3 ambient = texelFetch(sampler2DArray(sdfgi_ambient_texture, linear_sampler), uvw, 0).rgb;
ambient_accum.rgb += ambient * weight;
ambient_accum.a += weight;
}
if (ambient_accum.a > 0) {
ambient_accum.rgb /= ambient_accum.a;
}
ambient_total = ambient_accum.rgb;
break;
}
total_light += ambient_total * params.gi_inject;
}
#endif
}
vec4 final_density = vec4(total_light * scattering + emission, total_density);
final_density = mix(final_density, reprojected_density, reproject_amount);
imageStore(density_map, pos, final_density);
#ifdef MOLTENVK_USED
density_only_map[lpos] = 0;
light_only_map[lpos] = 0;
emissive_only_map[lpos] = 0;
#else
imageStore(density_only_map, pos, uvec4(0));
imageStore(light_only_map, pos, uvec4(0));
imageStore(emissive_only_map, pos, uvec4(0));
#endif
#endif
#ifdef MODE_FOG
ivec3 pos = ivec3(gl_GlobalInvocationID.xy, 0);
if (any(greaterThanEqual(pos, params.fog_volume_size))) {
return; //do not compute
}
vec4 fog_accum = vec4(0.0, 0.0, 0.0, 1.0);
float prev_z = 0.0;
for (int i = 0; i < params.fog_volume_size.z; i++) {
//compute fog position
ivec3 fog_pos = pos + ivec3(0, 0, i);
//get fog value
vec4 fog = imageLoad(density_map, fog_pos);
//get depth at cell pos
float z = get_depth_at_pos(fog_cell_size.z, i);
//get distance from previous pos
float d = abs(prev_z - z);
//compute transmittance using beer's law
float transmittance = exp(-d * fog.a);
fog_accum.rgb += ((fog.rgb - fog.rgb * transmittance) / max(fog.a, 0.00001)) * fog_accum.a;
fog_accum.a *= transmittance;
prev_z = z;
imageStore(fog_map, fog_pos, vec4(fog_accum.rgb, 1.0 - fog_accum.a));
}
#endif
#ifdef MODE_FILTER
ivec3 pos = ivec3(gl_GlobalInvocationID.xyz);
const float gauss[7] = float[](0.071303, 0.131514, 0.189879, 0.214607, 0.189879, 0.131514, 0.071303);
const ivec3 filter_dir[3] = ivec3[](ivec3(1, 0, 0), ivec3(0, 1, 0), ivec3(0, 0, 1));
ivec3 offset = filter_dir[params.filter_axis];
vec4 accum = vec4(0.0);
for (int i = -3; i <= 3; i++) {
accum += imageLoad(source_map, clamp(pos + offset * i, ivec3(0), params.fog_volume_size - ivec3(1))) * gauss[i + 3];
}
imageStore(dest_map, pos, accum);
#endif
#ifdef MODE_COPY
ivec3 pos = ivec3(gl_GlobalInvocationID.xyz);
if (any(greaterThanEqual(pos, params.fog_volume_size))) {
return; //do not compute
}
imageStore(dest_map, pos, imageLoad(source_map, pos));
#endif
}
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