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virtualx-engine/servers/rendering/renderer_rd/shaders/particles.glsl

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GLSL
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#[compute]
#version 450
#VERSION_DEFINES
layout(local_size_x = 64, local_size_y = 1, local_size_z = 1) in;
#define SDF_MAX_LENGTH 16384.0
/* SET 0: GLOBAL DATA */
#include "samplers_inc.glsl"
layout(set = 0, binding = 2, std430) restrict readonly buffer GlobalShaderUniformData {
vec4 data[];
}
global_shader_uniforms;
/* Set 1: FRAME AND PARTICLE DATA */
// a frame history is kept for trail deterministic behavior
#define MAX_ATTRACTORS 32
#define ATTRACTOR_TYPE_SPHERE 0
#define ATTRACTOR_TYPE_BOX 1
#define ATTRACTOR_TYPE_VECTOR_FIELD 2
struct Attractor {
mat4 transform;
vec3 extents; //exents or radius
uint type;
uint texture_index; //texture index for vector field
float strength;
float attenuation;
float directionality;
};
#define MAX_COLLIDERS 32
#define COLLIDER_TYPE_SPHERE 0
#define COLLIDER_TYPE_BOX 1
#define COLLIDER_TYPE_SDF 2
#define COLLIDER_TYPE_HEIGHT_FIELD 3
#define COLLIDER_TYPE_2D_SDF 4
struct Collider {
mat4 transform;
vec3 extents; //exents or radius
uint type;
uint texture_index; //texture index for vector field
float scale;
uint pad[2];
};
struct FrameParams {
bool emitting;
float system_phase;
float prev_system_phase;
uint cycle;
float explosiveness;
float randomness;
float time;
float delta;
uint frame;
float amount_ratio;
uint pad1;
uint pad2;
uint random_seed;
uint attractor_count;
uint collider_count;
float particle_size;
mat4 emission_transform;
vec3 emitter_velocity;
float interp_to_end;
Attractor attractors[MAX_ATTRACTORS];
Collider colliders[MAX_COLLIDERS];
};
layout(set = 1, binding = 0, std430) restrict buffer FrameHistory {
FrameParams data[];
}
frame_history;
#define PARTICLE_FLAG_ACTIVE uint(1)
#define PARTICLE_FLAG_STARTED uint(2)
#define PARTICLE_FLAG_TRAILED uint(4)
#define PARTICLE_FRAME_MASK uint(0xFFFF)
#define PARTICLE_FRAME_SHIFT uint(16)
struct ParticleData {
mat4 xform;
vec3 velocity;
uint flags;
vec4 color;
vec4 custom;
#ifdef USERDATA1_USED
vec4 userdata1;
#endif
#ifdef USERDATA2_USED
vec4 userdata2;
#endif
#ifdef USERDATA3_USED
vec4 userdata3;
#endif
#ifdef USERDATA4_USED
vec4 userdata4;
#endif
#ifdef USERDATA5_USED
vec4 userdata5;
#endif
#ifdef USERDATA6_USED
vec4 userdata6;
#endif
};
layout(set = 1, binding = 1, std430) restrict buffer Particles {
ParticleData data[];
}
particles;
#define EMISSION_FLAG_HAS_POSITION 1
#define EMISSION_FLAG_HAS_ROTATION_SCALE 2
#define EMISSION_FLAG_HAS_VELOCITY 4
#define EMISSION_FLAG_HAS_COLOR 8
#define EMISSION_FLAG_HAS_CUSTOM 16
struct ParticleEmission {
mat4 xform;
vec3 velocity;
uint flags;
vec4 color;
vec4 custom;
};
layout(set = 1, binding = 2, std430) restrict buffer SourceEmission {
int particle_count;
uint pad0;
uint pad1;
uint pad2;
ParticleEmission data[];
}
src_particles;
layout(set = 1, binding = 3, std430) restrict buffer DestEmission {
int particle_count;
int particle_max;
uint pad1;
uint pad2;
ParticleEmission data[];
}
dst_particles;
/* SET 2: COLLIDER/ATTRACTOR TEXTURES */
#define MAX_3D_TEXTURES 7
layout(set = 2, binding = 0) uniform texture3D sdf_vec_textures[MAX_3D_TEXTURES];
layout(set = 2, binding = 1) uniform texture2D height_field_texture;
/* SET 3: MATERIAL */
#ifdef MATERIAL_UNIFORMS_USED
layout(set = 3, binding = 0, std140) uniform MaterialUniforms{
#MATERIAL_UNIFORMS
} material;
#endif
layout(push_constant, std430) uniform Params {
float lifetime;
bool clear;
uint total_particles;
uint trail_size;
bool use_fractional_delta;
bool sub_emitter_mode;
bool can_emit;
bool trail_pass;
}
params;
uint hash(uint x) {
x = ((x >> uint(16)) ^ x) * uint(0x45d9f3b);
x = ((x >> uint(16)) ^ x) * uint(0x45d9f3b);
x = (x >> uint(16)) ^ x;
return x;
}
bool emit_subparticle(mat4 p_xform, vec3 p_velocity, vec4 p_color, vec4 p_custom, uint p_flags) {
if (!params.can_emit) {
return false;
}
bool valid = false;
int dst_index = atomicAdd(dst_particles.particle_count, 1);
if (dst_index >= dst_particles.particle_max) {
atomicAdd(dst_particles.particle_count, -1);
return false;
}
dst_particles.data[dst_index].xform = p_xform;
dst_particles.data[dst_index].velocity = p_velocity;
dst_particles.data[dst_index].color = p_color;
dst_particles.data[dst_index].custom = p_custom;
dst_particles.data[dst_index].flags = p_flags;
return true;
}
vec3 safe_normalize(vec3 direction) {
const float EPSILON = 0.001;
if (length(direction) < EPSILON) {
return vec3(0.0);
}
return normalize(direction);
}
#GLOBALS
void main() {
uint particle = gl_GlobalInvocationID.x;
if (params.trail_size > 1) {
if (params.trail_pass) {
if (particle >= params.total_particles * (params.trail_size - 1)) {
return;
}
particle += (particle / (params.trail_size - 1)) + 1;
} else {
if (particle >= params.total_particles) {
return;
}
particle *= params.trail_size;
}
}
if (particle >= params.total_particles * params.trail_size) {
return; //discard
}
uint index = particle / params.trail_size;
uint frame = (particle % params.trail_size);
#define FRAME frame_history.data[frame]
#define PARTICLE particles.data[particle]
bool apply_forces = true;
bool apply_velocity = true;
float local_delta = FRAME.delta;
float mass = 1.0;
bool restart = false;
bool restart_position = false;
bool restart_rotation_scale = false;
bool restart_velocity = false;
bool restart_color = false;
bool restart_custom = false;
if (params.clear) {
PARTICLE.color = vec4(1.0);
PARTICLE.custom = vec4(0.0);
PARTICLE.velocity = vec3(0.0);
PARTICLE.flags = 0;
PARTICLE.xform = mat4(
vec4(1.0, 0.0, 0.0, 0.0),
vec4(0.0, 1.0, 0.0, 0.0),
vec4(0.0, 0.0, 1.0, 0.0),
vec4(0.0, 0.0, 0.0, 1.0));
}
//clear started flag if set
if (params.trail_pass) {
//trail started
uint src_idx = index * params.trail_size;
if (bool(particles.data[src_idx].flags & PARTICLE_FLAG_STARTED)) {
//save start conditions for trails
PARTICLE.color = particles.data[src_idx].color;
PARTICLE.custom = particles.data[src_idx].custom;
PARTICLE.velocity = particles.data[src_idx].velocity;
PARTICLE.flags = PARTICLE_FLAG_TRAILED | ((frame_history.data[0].frame & PARTICLE_FRAME_MASK) << PARTICLE_FRAME_SHIFT); //mark it as trailed, save in which frame it will start
PARTICLE.xform = particles.data[src_idx].xform;
#ifdef USERDATA1_USED
PARTICLE.userdata1 = particles.data[src_idx].userdata1;
#endif
#ifdef USERDATA2_USED
PARTICLE.userdata2 = particles.data[src_idx].userdata2;
#endif
#ifdef USERDATA3_USED
PARTICLE.userdata3 = particles.data[src_idx].userdata3;
#endif
#ifdef USERDATA4_USED
PARTICLE.userdata4 = particles.data[src_idx].userdata4;
#endif
#ifdef USERDATA5_USED
PARTICLE.userdata5 = particles.data[src_idx].userdata5;
#endif
#ifdef USERDATA6_USED
PARTICLE.userdata6 = particles.data[src_idx].userdata6;
#endif
}
if (!bool(particles.data[src_idx].flags & PARTICLE_FLAG_ACTIVE)) {
// Disable the entire trail if the parent is no longer active.
PARTICLE.flags = 0;
return;
}
if (bool(PARTICLE.flags & PARTICLE_FLAG_TRAILED) && ((PARTICLE.flags >> PARTICLE_FRAME_SHIFT) == (FRAME.frame & PARTICLE_FRAME_MASK))) { //check this is trailed and see if it should start now
// we just assume that this is the first frame of the particle, the rest is deterministic
PARTICLE.flags = PARTICLE_FLAG_ACTIVE | (particles.data[src_idx].flags & (PARTICLE_FRAME_MASK << PARTICLE_FRAME_SHIFT));
return; //- this appears like it should be correct, but it seems not to be.. wonder why.
}
} else {
PARTICLE.flags &= ~PARTICLE_FLAG_STARTED;
}
bool collided = false;
vec3 collision_normal = vec3(0.0);
float collision_depth = 0.0;
vec3 attractor_force = vec3(0.0);
#if !defined(DISABLE_VELOCITY)
if (bool(PARTICLE.flags & PARTICLE_FLAG_ACTIVE)) {
PARTICLE.xform[3].xyz += PARTICLE.velocity * local_delta;
}
#endif
if (!params.trail_pass && params.sub_emitter_mode) {
if (!bool(PARTICLE.flags & PARTICLE_FLAG_ACTIVE)) {
int src_index = atomicAdd(src_particles.particle_count, -1) - 1;
if (src_index >= 0) {
PARTICLE.flags = (PARTICLE_FLAG_ACTIVE | PARTICLE_FLAG_STARTED | (FRAME.cycle << PARTICLE_FRAME_SHIFT));
restart = true;
if (bool(src_particles.data[src_index].flags & EMISSION_FLAG_HAS_POSITION)) {
PARTICLE.xform[3] = src_particles.data[src_index].xform[3];
} else {
PARTICLE.xform[3] = vec4(0, 0, 0, 1);
restart_position = true;
}
if (bool(src_particles.data[src_index].flags & EMISSION_FLAG_HAS_ROTATION_SCALE)) {
PARTICLE.xform[0] = src_particles.data[src_index].xform[0];
PARTICLE.xform[1] = src_particles.data[src_index].xform[1];
PARTICLE.xform[2] = src_particles.data[src_index].xform[2];
} else {
PARTICLE.xform[0] = vec4(1, 0, 0, 0);
PARTICLE.xform[1] = vec4(0, 1, 0, 0);
PARTICLE.xform[2] = vec4(0, 0, 1, 0);
restart_rotation_scale = true;
}
if (bool(src_particles.data[src_index].flags & EMISSION_FLAG_HAS_VELOCITY)) {
PARTICLE.velocity = src_particles.data[src_index].velocity;
} else {
PARTICLE.velocity = vec3(0);
restart_velocity = true;
}
if (bool(src_particles.data[src_index].flags & EMISSION_FLAG_HAS_COLOR)) {
PARTICLE.color = src_particles.data[src_index].color;
} else {
PARTICLE.color = vec4(1);
restart_color = true;
}
if (bool(src_particles.data[src_index].flags & EMISSION_FLAG_HAS_CUSTOM)) {
PARTICLE.custom = src_particles.data[src_index].custom;
} else {
PARTICLE.custom = vec4(0);
restart_custom = true;
}
}
}
} else if (FRAME.emitting) {
float restart_phase = float(index) / float(params.total_particles);
if (FRAME.randomness > 0.0) {
uint seed = FRAME.cycle;
if (restart_phase >= FRAME.system_phase) {
seed -= uint(1);
}
seed *= uint(params.total_particles);
seed += uint(index);
float random = float(hash(seed) % uint(65536)) / 65536.0;
restart_phase += FRAME.randomness * random * 1.0 / float(params.total_particles);
}
restart_phase *= (1.0 - FRAME.explosiveness);
if (FRAME.system_phase > FRAME.prev_system_phase) {
// restart_phase >= prev_system_phase is used so particles emit in the first frame they are processed
if (restart_phase >= FRAME.prev_system_phase && restart_phase < FRAME.system_phase) {
restart = true;
if (params.use_fractional_delta) {
local_delta = (FRAME.system_phase - restart_phase) * params.lifetime;
}
}
} else if (FRAME.delta > 0.0) {
if (restart_phase >= FRAME.prev_system_phase) {
restart = true;
if (params.use_fractional_delta) {
local_delta = (1.0 - restart_phase + FRAME.system_phase) * params.lifetime;
}
} else if (restart_phase < FRAME.system_phase) {
restart = true;
if (params.use_fractional_delta) {
local_delta = (FRAME.system_phase - restart_phase) * params.lifetime;
}
}
}
if (params.trail_pass) {
restart = false;
}
if (restart) {
PARTICLE.flags = FRAME.emitting ? (PARTICLE_FLAG_ACTIVE | PARTICLE_FLAG_STARTED | (FRAME.cycle << PARTICLE_FRAME_SHIFT)) : 0;
restart_position = true;
restart_rotation_scale = true;
restart_velocity = true;
restart_color = true;
restart_custom = true;
}
}
bool particle_active = bool(PARTICLE.flags & PARTICLE_FLAG_ACTIVE);
uint particle_number = (PARTICLE.flags >> PARTICLE_FRAME_SHIFT) * uint(params.total_particles) + index;
if (restart && particle_active) {
#CODE : START
}
if (particle_active) {
for (uint i = 0; i < FRAME.attractor_count; i++) {
vec3 dir;
float amount;
vec3 rel_vec = PARTICLE.xform[3].xyz - FRAME.attractors[i].transform[3].xyz;
vec3 local_pos = rel_vec * mat3(FRAME.attractors[i].transform);
switch (FRAME.attractors[i].type) {
case ATTRACTOR_TYPE_SPHERE: {
dir = safe_normalize(rel_vec);
float d = length(local_pos) / FRAME.attractors[i].extents.x;
if (d > 1.0) {
continue;
}
amount = max(0.0, 1.0 - d);
} break;
case ATTRACTOR_TYPE_BOX: {
dir = safe_normalize(rel_vec);
vec3 abs_pos = abs(local_pos / FRAME.attractors[i].extents);
float d = max(abs_pos.x, max(abs_pos.y, abs_pos.z));
if (d > 1.0) {
continue;
}
amount = max(0.0, 1.0 - d);
} break;
case ATTRACTOR_TYPE_VECTOR_FIELD: {
vec3 uvw_pos = (local_pos / FRAME.attractors[i].extents + 1.0) * 0.5;
if (any(lessThan(uvw_pos, vec3(0.0))) || any(greaterThan(uvw_pos, vec3(1.0)))) {
continue;
}
vec3 s = texture(sampler3D(sdf_vec_textures[FRAME.attractors[i].texture_index], SAMPLER_LINEAR_CLAMP), uvw_pos).xyz * -2.0 + 1.0;
dir = mat3(FRAME.attractors[i].transform) * safe_normalize(s); //revert direction
amount = length(s);
} break;
}
amount = pow(amount, FRAME.attractors[i].attenuation);
dir = safe_normalize(mix(dir, FRAME.attractors[i].transform[2].xyz, FRAME.attractors[i].directionality));
attractor_force -= amount * dir * FRAME.attractors[i].strength;
}
float particle_size = FRAME.particle_size;
#ifdef USE_COLLISION_SCALE
particle_size *= dot(vec3(length(PARTICLE.xform[0].xyz), length(PARTICLE.xform[1].xyz), length(PARTICLE.xform[2].xyz)), vec3(0.33333333333));
#endif
if (FRAME.collider_count == 1 && FRAME.colliders[0].type == COLLIDER_TYPE_2D_SDF) {
//2D collision
vec2 pos = PARTICLE.xform[3].xy;
vec4 to_sdf_x = FRAME.colliders[0].transform[0];
vec4 to_sdf_y = FRAME.colliders[0].transform[1];
vec2 sdf_pos = vec2(dot(vec4(pos, 0, 1), to_sdf_x), dot(vec4(pos, 0, 1), to_sdf_y));
vec4 sdf_to_screen = vec4(FRAME.colliders[0].extents, FRAME.colliders[0].scale);
vec2 uv_pos = sdf_pos * sdf_to_screen.xy + sdf_to_screen.zw;
if (all(greaterThan(uv_pos, vec2(0.0))) && all(lessThan(uv_pos, vec2(1.0)))) {
vec2 pos2 = pos + vec2(0, particle_size);
vec2 sdf_pos2 = vec2(dot(vec4(pos2, 0, 1), to_sdf_x), dot(vec4(pos2, 0, 1), to_sdf_y));
float sdf_particle_size = distance(sdf_pos, sdf_pos2);
float d = texture(sampler2D(height_field_texture, SAMPLER_LINEAR_CLAMP), uv_pos).r * SDF_MAX_LENGTH;
d -= sdf_particle_size;
if (d < 0.0) {
const float EPSILON = 0.001;
vec2 n = normalize(vec2(
texture(sampler2D(height_field_texture, SAMPLER_LINEAR_CLAMP), uv_pos + vec2(EPSILON, 0.0)).r - texture(sampler2D(height_field_texture, SAMPLER_LINEAR_CLAMP), uv_pos - vec2(EPSILON, 0.0)).r,
texture(sampler2D(height_field_texture, SAMPLER_LINEAR_CLAMP), uv_pos + vec2(0.0, EPSILON)).r - texture(sampler2D(height_field_texture, SAMPLER_LINEAR_CLAMP), uv_pos - vec2(0.0, EPSILON)).r));
collided = true;
sdf_pos2 = sdf_pos + n * d;
pos2 = vec2(dot(vec4(sdf_pos2, 0, 1), FRAME.colliders[0].transform[2]), dot(vec4(sdf_pos2, 0, 1), FRAME.colliders[0].transform[3]));
n = pos - pos2;
collision_normal = normalize(vec3(n, 0.0));
collision_depth = length(n);
}
}
} else {
for (uint i = 0; i < FRAME.collider_count; i++) {
vec3 normal;
float depth;
bool col = false;
vec3 rel_vec = PARTICLE.xform[3].xyz - FRAME.colliders[i].transform[3].xyz;
vec3 local_pos = rel_vec * mat3(FRAME.colliders[i].transform);
// Allowing for a small epsilon to allow particle just touching colliders to count as collided
const float EPSILON = 0.001;
switch (FRAME.colliders[i].type) {
case COLLIDER_TYPE_SPHERE: {
float d = length(rel_vec) - (particle_size + FRAME.colliders[i].extents.x);
if (d <= EPSILON) {
col = true;
depth = -d;
normal = normalize(rel_vec);
}
} break;
case COLLIDER_TYPE_BOX: {
vec3 abs_pos = abs(local_pos);
vec3 sgn_pos = sign(local_pos);
if (any(greaterThan(abs_pos, FRAME.colliders[i].extents))) {
//point outside box
vec3 closest = min(abs_pos, FRAME.colliders[i].extents);
vec3 rel = abs_pos - closest;
depth = length(rel) - particle_size;
if (depth <= EPSILON) {
col = true;
normal = mat3(FRAME.colliders[i].transform) * (normalize(rel) * sgn_pos);
depth = -depth;
}
} else {
//point inside box
vec3 axis_len = FRAME.colliders[i].extents - abs_pos;
// there has to be a faster way to do this?
if (all(lessThan(axis_len.xx, axis_len.yz))) {
normal = vec3(1, 0, 0);
} else if (all(lessThan(axis_len.yy, axis_len.xz))) {
normal = vec3(0, 1, 0);
} else {
normal = vec3(0, 0, 1);
}
col = true;
depth = dot(normal * axis_len, vec3(1)) + particle_size;
normal = mat3(FRAME.colliders[i].transform) * (normal * sgn_pos);
}
} break;
case COLLIDER_TYPE_SDF: {
vec3 apos = abs(local_pos);
float extra_dist = 0.0;
if (any(greaterThan(apos, FRAME.colliders[i].extents))) { //outside
vec3 mpos = min(apos, FRAME.colliders[i].extents);
extra_dist = distance(mpos, apos);
}
if (extra_dist > particle_size) {
continue;
}
vec3 uvw_pos = (local_pos / FRAME.colliders[i].extents) * 0.5 + 0.5;
float s = texture(sampler3D(sdf_vec_textures[FRAME.colliders[i].texture_index], SAMPLER_LINEAR_CLAMP), uvw_pos).r;
s *= FRAME.colliders[i].scale;
s += extra_dist;
if (s <= particle_size + EPSILON) {
col = true;
depth = particle_size - s;
normal = mat3(FRAME.colliders[i].transform) *
normalize(
vec3(
texture(sampler3D(sdf_vec_textures[FRAME.colliders[i].texture_index], SAMPLER_LINEAR_CLAMP), uvw_pos + vec3(EPSILON, 0.0, 0.0)).r - texture(sampler3D(sdf_vec_textures[FRAME.colliders[i].texture_index], SAMPLER_LINEAR_CLAMP), uvw_pos - vec3(EPSILON, 0.0, 0.0)).r,
texture(sampler3D(sdf_vec_textures[FRAME.colliders[i].texture_index], SAMPLER_LINEAR_CLAMP), uvw_pos + vec3(0.0, EPSILON, 0.0)).r - texture(sampler3D(sdf_vec_textures[FRAME.colliders[i].texture_index], SAMPLER_LINEAR_CLAMP), uvw_pos - vec3(0.0, EPSILON, 0.0)).r,
texture(sampler3D(sdf_vec_textures[FRAME.colliders[i].texture_index], SAMPLER_LINEAR_CLAMP), uvw_pos + vec3(0.0, 0.0, EPSILON)).r - texture(sampler3D(sdf_vec_textures[FRAME.colliders[i].texture_index], SAMPLER_LINEAR_CLAMP), uvw_pos - vec3(0.0, 0.0, EPSILON)).r));
}
} break;
case COLLIDER_TYPE_HEIGHT_FIELD: {
vec3 local_pos_bottom = local_pos;
local_pos_bottom.y -= particle_size;
if (any(greaterThan(abs(local_pos_bottom), FRAME.colliders[i].extents))) {
continue;
}
const float DELTA = 1.0 / 8192.0;
vec3 uvw_pos = vec3(local_pos_bottom / FRAME.colliders[i].extents) * 0.5 + 0.5;
float y = texture(sampler2D(height_field_texture, SAMPLER_LINEAR_CLAMP), uvw_pos.xz).r;
if (y + EPSILON >= uvw_pos.y) {
//inside heightfield
vec3 pos1 = (vec3(uvw_pos.x, y, uvw_pos.z) * 2.0 - 1.0) * FRAME.colliders[i].extents;
vec3 pos2 = (vec3(uvw_pos.x + DELTA, texture(sampler2D(height_field_texture, SAMPLER_LINEAR_CLAMP), uvw_pos.xz + vec2(DELTA, 0)).r, uvw_pos.z) * 2.0 - 1.0) * FRAME.colliders[i].extents;
vec3 pos3 = (vec3(uvw_pos.x, texture(sampler2D(height_field_texture, SAMPLER_LINEAR_CLAMP), uvw_pos.xz + vec2(0, DELTA)).r, uvw_pos.z + DELTA) * 2.0 - 1.0) * FRAME.colliders[i].extents;
normal = normalize(cross(pos1 - pos2, pos1 - pos3));
float local_y = (vec3(local_pos / FRAME.colliders[i].extents) * 0.5 + 0.5).y;
col = true;
depth = dot(normal, pos1) - dot(normal, local_pos_bottom);
}
} break;
}
if (col) {
if (!collided) {
collided = true;
collision_normal = normal;
collision_depth = depth;
} else {
vec3 c = collision_normal * collision_depth;
c += normal * max(0.0, depth - dot(normal, c));
collision_normal = normalize(c);
collision_depth = length(c);
}
}
}
}
}
if (particle_active) {
#CODE : PROCESS
}
PARTICLE.flags &= ~PARTICLE_FLAG_ACTIVE;
if (particle_active) {
PARTICLE.flags |= PARTICLE_FLAG_ACTIVE;
}
}
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