godot/servers/visual/rasterizer_rd/shaders/giprobe.glsl

809 lines
20 KiB
GLSL

[compute]
#version 450
VERSION_DEFINES
#ifdef MODE_DYNAMIC
layout(local_size_x = 8, local_size_y = 8, local_size_z = 1) in;
#else
layout(local_size_x = 64, local_size_y = 1, local_size_z = 1) in;
#endif
#ifndef MODE_DYNAMIC
#define NO_CHILDREN 0xFFFFFFFF
#define GREY_VEC vec3(0.33333,0.33333,0.33333)
struct CellChildren {
uint children[8];
};
layout(set=0,binding=1,std430) buffer CellChildrenBuffer {
CellChildren data[];
} cell_children;
struct CellData {
uint position; // xyz 10 bits
uint albedo; //rgb albedo
uint emission; //rgb normalized with e as multiplier
uint normal; //RGB normal encoded
};
layout(set=0,binding=2,std430) buffer CellDataBuffer {
CellData data[];
} cell_data;
#endif // MODE DYNAMIC
#define LIGHT_TYPE_DIRECTIONAL 0
#define LIGHT_TYPE_OMNI 1
#define LIGHT_TYPE_SPOT 2
#if defined(MODE_COMPUTE_LIGHT) || defined(MODE_DYNAMIC_LIGHTING)
struct Light {
uint type;
float energy;
float radius;
float attenuation;
vec3 color;
float spot_angle_radians;
vec3 position;
float spot_attenuation;
vec3 direction;
bool has_shadow;
};
layout(set=0,binding=3,std140) uniform Lights {
Light data[MAX_LIGHTS];
} lights;
#endif // MODE COMPUTE LIGHT
#ifdef MODE_SECOND_BOUNCE
layout (set=0,binding=5) uniform texture3D color_texture;
#ifdef MODE_ANISOTROPIC
layout (set=0,binding=7) uniform texture3D aniso_pos_texture;
layout (set=0,binding=8) uniform texture3D aniso_neg_texture;
#endif // MODE ANISOTROPIC
#endif // MODE_SECOND_BOUNCE
#ifndef MODE_DYNAMIC
layout(push_constant, binding = 0, std430) uniform Params {
ivec3 limits;
uint stack_size;
float emission_scale;
float propagation;
float dynamic_range;
uint light_count;
uint cell_offset;
uint cell_count;
float aniso_strength;
uint pad;
} params;
layout(set=0,binding=4,std430) buffer Outputs {
vec4 data[];
} outputs;
#endif // MODE DYNAMIC
layout (set=0,binding=9) uniform texture3D texture_sdf;
layout (set=0,binding=10) uniform sampler texture_sampler;
#ifdef MODE_WRITE_TEXTURE
layout (rgba8,set=0,binding=5) uniform restrict writeonly image3D color_tex;
#ifdef MODE_ANISOTROPIC
layout (r16ui,set=0,binding=6) uniform restrict writeonly uimage3D aniso_pos_tex;
layout (r16ui,set=0,binding=7) uniform restrict writeonly uimage3D aniso_neg_tex;
#endif
#endif
#ifdef MODE_DYNAMIC
layout(push_constant, binding = 0, std430) uniform Params {
ivec3 limits;
uint light_count;
ivec3 x_dir;
float z_base;
ivec3 y_dir;
float z_sign;
ivec3 z_dir;
float pos_multiplier;
ivec2 rect_pos;
ivec2 rect_size;
ivec2 prev_rect_ofs;
ivec2 prev_rect_size;
bool flip_x;
bool flip_y;
float dynamic_range;
bool keep_downsample_color;
} params;
#ifdef MODE_DYNAMIC_LIGHTING
layout (rgba8,set=0,binding=5) uniform restrict readonly image2D source_albedo;
layout (rgba8,set=0,binding=6) uniform restrict readonly image2D source_normal;
layout (rgba8,set=0,binding=7) uniform restrict readonly image2D source_orm;
//layout (set=0,binding=8) uniform texture2D source_depth;
layout (rgba16f,set=0,binding=11) uniform restrict image2D emission;
layout (r32f,set=0,binding=12) uniform restrict image2D depth;
#endif
#ifdef MODE_DYNAMIC_SHRINK
layout (rgba16f,set=0,binding=5) uniform restrict readonly image2D source_light;
layout (r32f,set=0,binding=6) uniform restrict readonly image2D source_depth;
#ifdef MODE_DYNAMIC_SHRINK_WRITE
layout (rgba16f,set=0,binding=7) uniform restrict writeonly image2D light;
layout (r32f,set=0,binding=8) uniform restrict writeonly image2D depth;
#endif // MODE_DYNAMIC_SHRINK_WRITE
#ifdef MODE_DYNAMIC_SHRINK_PLOT
layout (rgba8,set=0,binding=11) uniform restrict image3D color_texture;
#ifdef MODE_ANISOTROPIC
layout (r16ui,set=0,binding=12) uniform restrict writeonly uimage3D aniso_pos_texture;
layout (r16ui,set=0,binding=13) uniform restrict writeonly uimage3D aniso_neg_texture;
#endif // MODE ANISOTROPIC
#endif //MODE_DYNAMIC_SHRINK_PLOT
#endif // MODE_DYNAMIC_SHRINK
//layout (rgba8,set=0,binding=5) uniform restrict writeonly image3D color_tex;
#endif // MODE DYNAMIC
#if defined(MODE_COMPUTE_LIGHT) || defined(MODE_DYNAMIC_LIGHTING)
float raymarch(float distance,float distance_adv,vec3 from,vec3 direction) {
vec3 cell_size = 1.0 / vec3(params.limits);
while (distance > 0.0) { //use this to avoid precision errors
float advance = texture(sampler3D(texture_sdf,texture_sampler),from * cell_size).r * 255.0 - 1.0;
if (advance<0.0) {
break;
}
advance = max(distance_adv, advance - mod(advance, distance_adv)); //should always advance in multiples of distance_adv
from += direction * advance;
distance -= advance;
}
return max(0.0,distance);
}
bool compute_light_vector(uint light, vec3 pos,out float attenuation, out vec3 light_pos) {
if (lights.data[light].type==LIGHT_TYPE_DIRECTIONAL) {
light_pos = pos - lights.data[light].direction * length(vec3(params.limits));
attenuation = 1.0;
} else {
light_pos = lights.data[light].position;
float distance = length(pos - light_pos);
if (distance >= lights.data[light].radius) {
return false;
}
attenuation = pow( clamp( 1.0 - distance / lights.data[light].radius, 0.0001, 1.0), lights.data[light].attenuation );
if (lights.data[light].type==LIGHT_TYPE_SPOT) {
vec3 rel = normalize(pos - light_pos);
float angle = acos(dot(rel,lights.data[light].direction));
if (angle > lights.data[light].spot_angle_radians) {
return false;
}
float d = clamp(angle / lights.data[light].spot_angle_radians, 0, 1);
attenuation *= pow(1.0 - d, lights.data[light].spot_attenuation);
}
}
return true;
}
float get_normal_advance(vec3 p_normal) {
vec3 normal = p_normal;
vec3 unorm = abs(normal);
if ((unorm.x >= unorm.y) && (unorm.x >= unorm.z)) {
// x code
unorm = normal.x > 0.0 ? vec3(1.0, 0.0, 0.0) : vec3(-1.0, 0.0, 0.0);
} else if ((unorm.y > unorm.x) && (unorm.y >= unorm.z)) {
// y code
unorm = normal.y > 0.0 ? vec3(0.0, 1.0, 0.0) : vec3(0.0, -1.0, 0.0);
} else if ((unorm.z > unorm.x) && (unorm.z > unorm.y)) {
// z code
unorm = normal.z > 0.0 ? vec3(0.0, 0.0, 1.0) : vec3(0.0, 0.0, -1.0);
} else {
// oh-no we messed up code
// has to be
unorm = vec3(1.0, 0.0, 0.0);
}
return 1.0 / dot(normal,unorm);
}
void clip_segment(vec4 plane, vec3 begin, inout vec3 end) {
vec3 segment = begin - end;
float den = dot(plane.xyz,segment);
//printf("den is %i\n",den);
if (den < 0.0001) {
return;
}
float dist = (dot(plane.xyz,begin) - plane.w) / den;
if (dist < 0.0001 || dist > 1.0001) {
return;
}
end = begin + segment * -dist;
}
bool compute_light_at_pos(uint index, vec3 pos, vec3 normal, inout vec3 light, inout vec3 light_dir) {
float attenuation;
vec3 light_pos;
if (!compute_light_vector(index,pos,attenuation,light_pos)) {
return false;
}
light_dir = normalize(pos - light_pos);
if (attenuation < 0.01 || (length(normal) > 0.2 && dot(normal,light_dir)>=0)) {
return false; //not facing the light, or attenuation is near zero
}
if (lights.data[index].has_shadow) {
float distance_adv = get_normal_advance(light_dir);
vec3 to = pos;
to-= sign(light_dir)*0.45; //go near the edge towards the light direction to avoid self occlusion
//clip
clip_segment(mix(vec4(-1.0,0.0,0.0,0.0),vec4(1.0,0.0,0.0,float(params.limits.x-1)),bvec4(light_dir.x < 0.0)),to,light_pos);
clip_segment(mix(vec4(0.0,-1.0,0.0,0.0),vec4(0.0,1.0,0.0,float(params.limits.y-1)),bvec4(light_dir.y < 0.0)),to,light_pos);
clip_segment(mix(vec4(0.0,0.0,-1.0,0.0),vec4(0.0,0.0,1.0,float(params.limits.z-1)),bvec4(light_dir.z < 0.0)),to,light_pos);
float distance = length(to-light_pos);
if (distance < 0.1) {
return false; // hit
}
distance += distance_adv - mod(distance, distance_adv); //make it reach the center of the box always
light_pos = to - light_dir * distance;
//from -= sign(light_dir)*0.45; //go near the edge towards the light direction to avoid self occlusion
float dist = raymarch(distance,distance_adv,light_pos,light_dir);
if (dist > distance_adv) {
return false;
}
}
light = lights.data[index].color * attenuation * lights.data[index].energy;
return true;
}
#endif // MODE COMPUTE LIGHT
void main() {
#ifndef MODE_DYNAMIC
uint cell_index = gl_GlobalInvocationID.x;;
if (cell_index >= params.cell_count) {
return;
}
cell_index += params.cell_offset;
uvec3 posu = uvec3(cell_data.data[cell_index].position&0x7FF,(cell_data.data[cell_index].position>>11)&0x3FF,cell_data.data[cell_index].position>>21);
vec4 albedo = unpackUnorm4x8(cell_data.data[cell_index].albedo);
#endif
/////////////////COMPUTE LIGHT///////////////////////////////
#ifdef MODE_COMPUTE_LIGHT
vec3 pos = vec3(posu) + vec3(0.5);
vec3 emission = vec3(uvec3(cell_data.data[cell_index].emission & 0x1ff,(cell_data.data[cell_index].emission >> 9) & 0x1ff,(cell_data.data[cell_index].emission >> 18) & 0x1ff)) * pow(2.0, float(cell_data.data[cell_index].emission >> 27) - 15.0 - 9.0);
vec3 normal = unpackSnorm4x8(cell_data.data[cell_index].normal).xyz;
#ifdef MODE_ANISOTROPIC
vec3 accum[6]=vec3[](vec3(0.0),vec3(0.0),vec3(0.0),vec3(0.0),vec3(0.0),vec3(0.0));
const vec3 accum_dirs[6]=vec3[](vec3(1.0,0.0,0.0),vec3(-1.0,0.0,0.0),vec3(0.0,1.0,0.0),vec3(0.0,-1.0,0.0),vec3(0.0,0.0,1.0),vec3(0.0,0.0,-1.0));
#else
vec3 accum = vec3(0.0);
#endif
for(uint i=0;i<params.light_count;i++) {
vec3 light;
vec3 light_dir;
if (!compute_light_at_pos(i,pos,normal.xyz,light,light_dir)) {
continue;
}
light*= albedo.rgb;
#ifdef MODE_ANISOTROPIC
for(uint j=0;j<6;j++) {
accum[j]+=max(0.0,dot(accum_dirs[j],-light_dir))*light;
}
#else
if (length(normal) > 0.2) {
accum+=max(0.0,dot(normal,-light_dir))*light;
} else {
//all directions
accum+=light;
}
#endif
}
#ifdef MODE_ANISOTROPIC
for(uint i=0;i<6;i++) {
vec3 light = accum[i];
if (length(normal) > 0.2) {
light += max(0.0,dot(accum_dirs[i],-normal)) * emission;
} else {
light += emission;
}
outputs.data[cell_index*6+i] = vec4(light,0.0);
}
#else
outputs.data[cell_index]=vec4(accum + emission,0.0);
#endif
#endif //MODE_COMPUTE_LIGHT
/////////////////SECOND BOUNCE///////////////////////////////
#ifdef MODE_SECOND_BOUNCE
vec3 pos = vec3(posu) + vec3(0.5);
ivec3 ipos = ivec3(posu);
vec4 normal = unpackSnorm4x8(cell_data.data[cell_index].normal);
#ifdef MODE_ANISOTROPIC
vec3 accum[6];
const vec3 accum_dirs[6]=vec3[](vec3(1.0,0.0,0.0),vec3(-1.0,0.0,0.0),vec3(0.0,1.0,0.0),vec3(0.0,-1.0,0.0),vec3(0.0,0.0,1.0),vec3(0.0,0.0,-1.0));
/*vec3 src_color = texelFetch(sampler3D(color_texture,texture_sampler),ipos,0).rgb * params.dynamic_range;
vec3 src_aniso_pos = texelFetch(sampler3D(aniso_pos_texture,texture_sampler),ipos,0).rgb;
vec3 src_anisp_neg = texelFetch(sampler3D(anisp_neg_texture,texture_sampler),ipos,0).rgb;
accum[0]=src_col * src_aniso_pos.x;
accum[1]=src_col * src_aniso_neg.x;
accum[2]=src_col * src_aniso_pos.y;
accum[3]=src_col * src_aniso_neg.y;
accum[4]=src_col * src_aniso_pos.z;
accum[5]=src_col * src_aniso_neg.z;*/
accum[0] = outputs.data[cell_index*6+0].rgb;
accum[1] = outputs.data[cell_index*6+1].rgb;
accum[2] = outputs.data[cell_index*6+2].rgb;
accum[3] = outputs.data[cell_index*6+3].rgb;
accum[4] = outputs.data[cell_index*6+4].rgb;
accum[5] = outputs.data[cell_index*6+5].rgb;
#else
vec3 accum = outputs.data[cell_index].rgb;
#endif
if (length(normal.xyz) > 0.2) {
vec3 v0 = abs(normal.z) < 0.999 ? vec3(0.0, 0.0, 1.0) : vec3(0.0, 1.0, 0.0);
vec3 tangent = normalize(cross(v0, normal.xyz));
vec3 bitangent = normalize(cross(tangent, normal.xyz));
mat3 normal_mat = mat3(tangent, bitangent, normal.xyz);
#define MAX_CONE_DIRS 6
vec3 cone_dirs[MAX_CONE_DIRS] = vec3[](
vec3(0.0, 0.0, 1.0),
vec3(0.866025, 0.0, 0.5),
vec3(0.267617, 0.823639, 0.5),
vec3(-0.700629, 0.509037, 0.5),
vec3(-0.700629, -0.509037, 0.5),
vec3(0.267617, -0.823639, 0.5));
float cone_weights[MAX_CONE_DIRS] = float[](0.25, 0.15, 0.15, 0.15, 0.15, 0.15);
float tan_half_angle = 0.577;
for (int i = 0; i < MAX_CONE_DIRS; i++) {
vec3 direction = normal_mat * cone_dirs[i];
vec4 color = vec4(0.0);
{
float dist = 1.5;
float max_distance = length(vec3(params.limits));
vec3 cell_size = 1.0 / vec3(params.limits);
#ifdef MODE_ANISOTROPIC
vec3 aniso_normal = mix(direction,normal.xyz,params.aniso_strength);
#endif
while (dist < max_distance && color.a < 0.95) {
float diameter = max(1.0, 2.0 * tan_half_angle * dist);
vec3 uvw_pos = (pos + dist * direction) * cell_size;
float half_diameter = diameter * 0.5;
//check if outside, then break
//if ( any(greaterThan(abs(uvw_pos - 0.5),vec3(0.5f + half_diameter * cell_size)) ) ) {
// break;
//}
float log2_diameter = log2(diameter);
vec4 scolor = textureLod(sampler3D(color_texture,texture_sampler), uvw_pos, log2_diameter);
#ifdef MODE_ANISOTROPIC
vec3 aniso_neg = textureLod(sampler3D(aniso_neg_texture,texture_sampler), uvw_pos, log2_diameter).rgb;
vec3 aniso_pos = textureLod(sampler3D(aniso_pos_texture,texture_sampler), uvw_pos, log2_diameter).rgb;
scolor.rgb*=dot(max(vec3(0.0),(aniso_normal * aniso_pos)),vec3(1.0)) + dot(max(vec3(0.0),(-aniso_normal * aniso_neg)),vec3(1.0));
#endif
float a = (1.0 - color.a);
color += a * scolor;
dist += half_diameter;
}
}
color *= cone_weights[i] * vec4(albedo.rgb,1.0) * params.dynamic_range; //restore range
#ifdef MODE_ANISOTROPIC
for(uint j=0;j<6;j++) {
accum[j]+=max(0.0,dot(accum_dirs[j],direction))*color.rgb;
}
#else
accum+=color.rgb;
#endif
}
}
#ifdef MODE_ANISOTROPIC
outputs.data[cell_index*6+0]=vec4(accum[0],0.0);
outputs.data[cell_index*6+1]=vec4(accum[1],0.0);
outputs.data[cell_index*6+2]=vec4(accum[2],0.0);
outputs.data[cell_index*6+3]=vec4(accum[3],0.0);
outputs.data[cell_index*6+4]=vec4(accum[4],0.0);
outputs.data[cell_index*6+5]=vec4(accum[5],0.0);
#else
outputs.data[cell_index]=vec4(accum,0.0);
#endif
#endif // MODE_SECOND_BOUNCE
/////////////////UPDATE MIPMAPS///////////////////////////////
#ifdef MODE_UPDATE_MIPMAPS
{
#ifdef MODE_ANISOTROPIC
vec3 light_accum[6] = vec3[](vec3(0.0),vec3(0.0),vec3(0.0),vec3(0.0),vec3(0.0),vec3(0.0));
#else
vec3 light_accum = vec3(0.0);
#endif
float count = 0.0;
for(uint i=0;i<8;i++) {
uint child_index = cell_children.data[cell_index].children[i];
if (child_index==NO_CHILDREN) {
continue;
}
#ifdef MODE_ANISOTROPIC
light_accum[0] += outputs.data[child_index*6+0].rgb;
light_accum[1] += outputs.data[child_index*6+1].rgb;
light_accum[2] += outputs.data[child_index*6+2].rgb;
light_accum[3] += outputs.data[child_index*6+3].rgb;
light_accum[4] += outputs.data[child_index*6+4].rgb;
light_accum[5] += outputs.data[child_index*6+5].rgb;
#else
light_accum += outputs.data[child_index].rgb;
#endif
count+=1.0;
}
float divisor = mix(8.0,count,params.propagation);
#ifdef MODE_ANISOTROPIC
outputs.data[cell_index*6+0]=vec4(light_accum[0] / divisor,0.0);
outputs.data[cell_index*6+1]=vec4(light_accum[1] / divisor,0.0);
outputs.data[cell_index*6+2]=vec4(light_accum[2] / divisor,0.0);
outputs.data[cell_index*6+3]=vec4(light_accum[3] / divisor,0.0);
outputs.data[cell_index*6+4]=vec4(light_accum[4] / divisor,0.0);
outputs.data[cell_index*6+5]=vec4(light_accum[5] / divisor,0.0);
#else
outputs.data[cell_index]=vec4(light_accum / divisor,0.0);
#endif
}
#endif
///////////////////WRITE TEXTURE/////////////////////////////
#ifdef MODE_WRITE_TEXTURE
{
#ifdef MODE_ANISOTROPIC
vec3 accum_total = vec3(0.0);
accum_total += outputs.data[cell_index*6+0].rgb;
accum_total += outputs.data[cell_index*6+1].rgb;
accum_total += outputs.data[cell_index*6+2].rgb;
accum_total += outputs.data[cell_index*6+3].rgb;
accum_total += outputs.data[cell_index*6+4].rgb;
accum_total += outputs.data[cell_index*6+5].rgb;
float accum_total_energy = max(dot(accum_total,GREY_VEC),0.00001);
vec3 iso_positive = vec3(dot(outputs.data[cell_index*6+0].rgb,GREY_VEC),dot(outputs.data[cell_index*6+2].rgb,GREY_VEC),dot(outputs.data[cell_index*6+4].rgb,GREY_VEC))/vec3(accum_total_energy);
vec3 iso_negative = vec3(dot(outputs.data[cell_index*6+1].rgb,GREY_VEC),dot(outputs.data[cell_index*6+3].rgb,GREY_VEC),dot(outputs.data[cell_index*6+5].rgb,GREY_VEC))/vec3(accum_total_energy);
{
uint aniso_pos = uint(clamp(iso_positive.b * 31.0,0.0,31.0));
aniso_pos |= uint(clamp(iso_positive.g * 63.0,0.0,63.0))<<5;
aniso_pos |= uint(clamp(iso_positive.r * 31.0,0.0,31.0))<<11;
imageStore(aniso_pos_tex,ivec3(posu),uvec4(aniso_pos));
}
{
uint aniso_neg = uint(clamp(iso_negative.b * 31.0,0.0,31.0));
aniso_neg |= uint(clamp(iso_negative.g * 63.0,0.0,63.0))<<5;
aniso_neg |= uint(clamp(iso_negative.r * 31.0,0.0,31.0))<<11;
imageStore(aniso_neg_tex,ivec3(posu),uvec4(aniso_neg));
}
imageStore(color_tex,ivec3(posu),vec4(accum_total / params.dynamic_range ,albedo.a));
#else
imageStore(color_tex,ivec3(posu),vec4(outputs.data[cell_index].rgb / params.dynamic_range,albedo.a));
#endif
}
#endif
///////////////////DYNAMIC LIGHTING/////////////////////////////
#ifdef MODE_DYNAMIC
ivec2 pos_xy = ivec2(gl_GlobalInvocationID.xy);
if (any(greaterThanEqual(pos_xy,params.rect_size))) {
return; //out of bounds
}
ivec2 uv_xy = pos_xy;
if (params.flip_x) {
uv_xy.x = params.rect_size.x - pos_xy.x - 1;
}
if (params.flip_y) {
uv_xy.y = params.rect_size.y - pos_xy.y - 1;
}
#ifdef MODE_DYNAMIC_LIGHTING
{
float z = params.z_base + imageLoad(depth,uv_xy).x * params.z_sign;
ivec3 pos = params.x_dir * (params.rect_pos.x + pos_xy.x) + params.y_dir * (params.rect_pos.y + pos_xy.y) + abs(params.z_dir) * int(z);
vec3 normal = imageLoad(source_normal,uv_xy).xyz * 2.0 - 1.0;
normal = vec3(params.x_dir) * normal.x * mix(1.0,-1.0,params.flip_x) + vec3(params.y_dir) * normal.y * mix(1.0,-1.0,params.flip_y) - vec3(params.z_dir) * normal.z;
vec4 albedo = imageLoad(source_albedo,uv_xy);
//determine the position in space
vec3 accum = vec3(0.0);
for(uint i=0;i<params.light_count;i++) {
vec3 light;
vec3 light_dir;
if (!compute_light_at_pos(i,vec3(pos) * params.pos_multiplier,normal,light,light_dir)) {
continue;
}
light*= albedo.rgb;
accum+=max(0.0,dot(normal,-light_dir))*light;
}
accum+=imageLoad(emission,uv_xy).xyz;
imageStore(emission,uv_xy,vec4(accum,albedo.a));
imageStore(depth,uv_xy,vec4(z));
}
#endif // MODE DYNAMIC LIGHTING
#ifdef MODE_DYNAMIC_SHRINK
{
vec4 accum = vec4(0.0);
float accum_z = 0.0;
float count = 0.0;
for(int i=0;i<4;i++) {
ivec2 ofs = pos_xy*2 + ivec2(i&1,i>>1) - params.prev_rect_ofs;
if (any(lessThan(ofs,ivec2(0))) || any(greaterThanEqual(ofs,params.prev_rect_size))) {
continue;
}
if (params.flip_x) {
ofs.x = params.prev_rect_size.x - ofs.x - 1;
}
if (params.flip_y) {
ofs.y = params.prev_rect_size.y - ofs.y - 1;
}
vec4 light = imageLoad(source_light,ofs);
if (light.a==0.0) { //ignore empty
continue;
}
accum += light;
float z = imageLoad(source_depth,ofs).x;
accum_z += z*0.5; //shrink half too
count+=1.0;
}
accum/=4.0;
if (count==0.0) {
accum_z=0.0; //avoid nan
} else {
accum_z/=count;
}
#ifdef MODE_DYNAMIC_SHRINK_WRITE
imageStore(light,uv_xy,accum);
imageStore(depth,uv_xy,vec4(accum_z));
#endif
#ifdef MODE_DYNAMIC_SHRINK_PLOT
if (accum.a<0.001) {
return; //do not blit if alpha is too low
}
ivec3 pos = params.x_dir * (params.rect_pos.x + pos_xy.x) + params.y_dir * (params.rect_pos.y + pos_xy.y) + abs(params.z_dir) * int(accum_z);
float z_frac = fract(accum_z);
for(int i = 0; i< 2; i++) {
ivec3 pos3d = pos + abs(params.z_dir) * i;
if (any(lessThan(pos3d,ivec3(0))) || any(greaterThanEqual(pos3d,params.limits))) {
//skip if offlimits
continue;
}
vec4 color_blit = accum * (i==0 ? 1.0 - z_frac : z_frac );
vec4 color = imageLoad(color_texture,pos3d);
color.rgb *=params.dynamic_range;
#if 0
color.rgb = mix(color.rgb,color_blit.rgb,color_blit.a);
color.a+=color_blit.a;
#else
float sa = 1.0 - color_blit.a;
vec4 result;
result.a = color.a * sa + color_blit.a;
if (result.a==0.0) {
result = vec4(0.0);
} else {
result.rgb = (color.rgb * color.a * sa + color_blit.rgb * color_blit.a) / result.a;
color = result;
}
#endif
color.rgb /= params.dynamic_range;
imageStore(color_texture,pos3d,color);
//imageStore(color_texture,pos3d,vec4(1,1,1,1));
#ifdef MODE_ANISOTROPIC
//do not care about anisotropy for dynamic objects, just store full lit in all directions
imageStore(aniso_pos_texture,pos3d,uvec4(0xFFFF));
imageStore(aniso_neg_texture,pos3d,uvec4(0xFFFF));
#endif // ANISOTROPIC
}
#endif // MODE_DYNAMIC_SHRINK_PLOT
}
#endif
#endif // MODE DYNAMIC
}