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Implement manual particle emission and particle sub emitters.

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This commit is contained in:
reduz
2020-09-06 09:18:10 -03:00
parent ceed524936
commit d0bddf53c5
14 changed files with 871 additions and 317 deletions
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250
servers/rendering/rasterizer_rd/shaders/particles.glsl
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@@ -66,6 +66,38 @@ layout(set = 1, binding = 1, std430) restrict buffer Particles {
}
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
@@ -82,7 +114,9 @@ layout(push_constant, binding = 0, std430) uniform Params {
uint total_particles;
uint trail_size;
bool use_fractional_delta;
uint pad[3];
bool sub_emitter_mode;
bool can_emit;
uint pad;
}
params;
@@ -93,6 +127,51 @@ uint hash(uint 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
@@ -118,71 +197,19 @@ void main() {
float mass = 1.0;
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);
bool restart = false;
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
bool restart_position = false;
bool restart_rotation_scale = false;
bool restart_velocity = false;
bool restart_color = false;
bool restart_custom = false;
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;
}
#ifdef ENABLE_KEEP_DATA
if (params.clear) {
#else
if (params.clear || restart) {
#endif
PARTICLE.color = vec4(1.0);
PARTICLE.custom = vec4(0.0);
PARTICLE.velocity = vec3(0.0);
if (!restart) {
PARTICLE.is_active = false;
}
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),
@@ -190,6 +217,111 @@ void main() {
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 */