394 lines
9.3 KiB
GLSL
394 lines
9.3 KiB
GLSL
#[compute]
|
|
|
|
#version 450
|
|
|
|
VERSION_DEFINES
|
|
|
|
layout(local_size_x = 64, local_size_y = 1, local_size_z = 1) in;
|
|
|
|
#define SAMPLER_NEAREST_CLAMP 0
|
|
#define SAMPLER_LINEAR_CLAMP 1
|
|
#define SAMPLER_NEAREST_WITH_MIPMAPS_CLAMP 2
|
|
#define SAMPLER_LINEAR_WITH_MIPMAPS_CLAMP 3
|
|
#define SAMPLER_NEAREST_WITH_MIPMAPS_ANISOTROPIC_CLAMP 4
|
|
#define SAMPLER_LINEAR_WITH_MIPMAPS_ANISOTROPIC_CLAMP 5
|
|
#define SAMPLER_NEAREST_REPEAT 6
|
|
#define SAMPLER_LINEAR_REPEAT 7
|
|
#define SAMPLER_NEAREST_WITH_MIPMAPS_REPEAT 8
|
|
#define SAMPLER_LINEAR_WITH_MIPMAPS_REPEAT 9
|
|
#define SAMPLER_NEAREST_WITH_MIPMAPS_ANISOTROPIC_REPEAT 10
|
|
#define SAMPLER_LINEAR_WITH_MIPMAPS_ANISOTROPIC_REPEAT 11
|
|
|
|
/* SET 0: GLOBAL DATA */
|
|
|
|
layout(set = 0, binding = 1) uniform sampler material_samplers[12];
|
|
|
|
layout(set = 0, binding = 2, std430) restrict readonly buffer GlobalVariableData {
|
|
vec4 data[];
|
|
}
|
|
global_variables;
|
|
|
|
/* Set 1: FRAME AND PARTICLE DATA */
|
|
|
|
// a frame history is kept for trail deterministic behavior
|
|
struct FrameParams {
|
|
bool emitting;
|
|
float system_phase;
|
|
float prev_system_phase;
|
|
uint cycle;
|
|
|
|
float explosiveness;
|
|
float randomness;
|
|
float time;
|
|
float delta;
|
|
|
|
uint random_seed;
|
|
uint pad[3];
|
|
|
|
mat4 emission_transform;
|
|
};
|
|
|
|
layout(set = 1, binding = 0, std430) restrict buffer FrameHistory {
|
|
FrameParams data[];
|
|
}
|
|
frame_history;
|
|
|
|
struct ParticleData {
|
|
mat4 xform;
|
|
vec3 velocity;
|
|
bool is_active;
|
|
vec4 color;
|
|
vec4 custom;
|
|
};
|
|
|
|
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 volatile coherent buffer SourceEmission {
|
|
int particle_count;
|
|
uint pad0;
|
|
uint pad1;
|
|
uint pad2;
|
|
ParticleEmission data[];
|
|
}
|
|
src_particles;
|
|
|
|
layout(set = 1, binding = 3, std430) restrict volatile coherent buffer DestEmission {
|
|
int particle_count;
|
|
int particle_max;
|
|
uint pad1;
|
|
uint pad2;
|
|
ParticleEmission data[];
|
|
}
|
|
dst_particles;
|
|
|
|
/* SET 2: MATERIAL */
|
|
|
|
#ifdef USE_MATERIAL_UNIFORMS
|
|
layout(set = 2, binding = 0, std140) uniform MaterialUniforms{
|
|
/* clang-format off */
|
|
MATERIAL_UNIFORMS
|
|
/* clang-format on */
|
|
} material;
|
|
#endif
|
|
|
|
layout(push_constant, binding = 0, std430) uniform Params {
|
|
float lifetime;
|
|
bool clear;
|
|
uint total_particles;
|
|
uint trail_size;
|
|
bool use_fractional_delta;
|
|
bool sub_emitter_mode;
|
|
bool can_emit;
|
|
uint pad;
|
|
}
|
|
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_particle(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;
|
|
}
|
|
/*
|
|
valid = true;
|
|
|
|
int attempts = 256; // never trust compute
|
|
while(attempts-- > 0) {
|
|
dst_index = dst_particles.particle_count;
|
|
if (dst_index == dst_particles.particle_max) {
|
|
return false; //cant emit anymore
|
|
}
|
|
|
|
if (atomicCompSwap(dst_particles.particle_count, dst_index, dst_index +1 ) != dst_index) {
|
|
continue;
|
|
}
|
|
valid=true;
|
|
break;
|
|
}
|
|
|
|
barrier();
|
|
|
|
if (!valid) {
|
|
return false; //gave up (attempts exhausted)
|
|
}
|
|
*/
|
|
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;
|
|
}
|
|
|
|
/* clang-format off */
|
|
|
|
COMPUTE_SHADER_GLOBALS
|
|
|
|
/* clang-format on */
|
|
|
|
void main() {
|
|
uint particle = gl_GlobalInvocationID.x;
|
|
|
|
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.is_active = false;
|
|
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));
|
|
}
|
|
|
|
if (params.sub_emitter_mode) {
|
|
if (!PARTICLE.is_active) {
|
|
int src_index = atomicAdd(src_particles.particle_count, -1) - 1;
|
|
|
|
if (src_index >= 0) {
|
|
PARTICLE.is_active = true;
|
|
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;
|
|
}
|
|
}
|
|
}
|
|
|
|
uint current_cycle = FRAME.cycle;
|
|
|
|
if (FRAME.system_phase < restart_phase) {
|
|
current_cycle -= uint(1);
|
|
}
|
|
|
|
uint particle_number = current_cycle * uint(params.total_particles) + particle;
|
|
|
|
if (restart) {
|
|
PARTICLE.is_active = FRAME.emitting;
|
|
restart_position = true;
|
|
restart_rotation_scale = true;
|
|
restart_velocity = true;
|
|
restart_color = true;
|
|
restart_custom = true;
|
|
}
|
|
}
|
|
|
|
if (PARTICLE.is_active) {
|
|
/* clang-format off */
|
|
|
|
COMPUTE_SHADER_CODE
|
|
|
|
/* clang-format on */
|
|
}
|
|
|
|
#if !defined(DISABLE_VELOCITY)
|
|
|
|
if (PARTICLE.is_active) {
|
|
PARTICLE.xform[3].xyz += PARTICLE.velocity * local_delta;
|
|
}
|
|
#endif
|
|
|
|
#if 0
|
|
if (PARTICLE.is_active) {
|
|
//execute shader
|
|
|
|
|
|
|
|
|
|
//!defined(DISABLE_FORCE)
|
|
|
|
if (false) {
|
|
vec3 force = vec3(0.0);
|
|
for (int i = 0; i < attractor_count; i++) {
|
|
vec3 rel_vec = xform[3].xyz - attractors[i].pos;
|
|
float dist = length(rel_vec);
|
|
if (attractors[i].radius < dist)
|
|
continue;
|
|
if (attractors[i].eat_radius > 0.0 && attractors[i].eat_radius > dist) {
|
|
out_velocity_active.a = 0.0;
|
|
}
|
|
|
|
rel_vec = normalize(rel_vec);
|
|
|
|
float attenuation = pow(dist / attractors[i].radius, attractors[i].attenuation);
|
|
|
|
if (attractors[i].dir == vec3(0.0)) {
|
|
//towards center
|
|
force += attractors[i].strength * rel_vec * attenuation * mass;
|
|
} else {
|
|
force += attractors[i].strength * attractors[i].dir * attenuation * mass;
|
|
}
|
|
}
|
|
|
|
out_velocity_active.xyz += force * local_delta;
|
|
}
|
|
|
|
#if !defined(DISABLE_VELOCITY)
|
|
|
|
if (true) {
|
|
xform[3].xyz += out_velocity_active.xyz * local_delta;
|
|
}
|
|
#endif
|
|
} else {
|
|
xform = mat4(0.0);
|
|
}
|
|
|
|
|
|
xform = transpose(xform);
|
|
|
|
out_velocity_active.a = mix(0.0, 1.0, shader_active);
|
|
|
|
out_xform_1 = xform[0];
|
|
out_xform_2 = xform[1];
|
|
out_xform_3 = xform[2];
|
|
#endif
|
|
}
|