235 lines
6.2 KiB
C
235 lines
6.2 KiB
C
#include "particle.h"
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#include "stb_ds.h"
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#include "render.h"
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#include "particle.sglsl.h"
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#include "2dphysics.h"
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#include "log.h"
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#include "simplex.h"
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#include "pthread.h"
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#include "math.h"
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#define SCHED_IMPLEMENTATION
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#include "sched.h"
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static emitter **emitters;
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static sg_shader par_shader;
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static sg_pipeline par_pipe;
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static sg_bindings par_bind;
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static int draw_count;
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#define MAX_PARTICLES 1000000
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struct scheduler sched;
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void *mem;
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struct par_vert {
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HMM_Vec2 pos;
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float angle;
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HMM_Vec2 scale;
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struct rgba color;
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};
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typedef struct par_vert par_vert;
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void particle_init()
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{
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sched_size needed;
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scheduler_init(&sched, &needed, 1, NULL);
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mem = calloc(needed, 1);
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scheduler_start(&sched,mem);
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par_shader = sg_make_shader(particle_shader_desc(sg_query_backend()));
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par_pipe = sg_make_pipeline(&(sg_pipeline_desc){
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.shader = par_shader,
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.layout = {
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.attrs = {
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[1].format = SG_VERTEXFORMAT_FLOAT2,
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[2].format = SG_VERTEXFORMAT_FLOAT,
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[3].format = SG_VERTEXFORMAT_FLOAT2,
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[4].format = SG_VERTEXFORMAT_UBYTE4N,
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[0].format = SG_VERTEXFORMAT_FLOAT2,
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[0].buffer_index = 1
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},
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.buffers[0].step_func = SG_VERTEXSTEP_PER_INSTANCE,
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},
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.primitive_type = SG_PRIMITIVETYPE_TRIANGLE_STRIP,
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.label = "particle pipeline",
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.cull_mode = SG_CULLMODE_BACK,
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.colors[0].blend = blend_trans,
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.depth = {
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.write_enabled = true,
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.compare = SG_COMPAREFUNC_LESS_EQUAL
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}
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});
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par_bind.vertex_buffers[0] = sg_make_buffer(&(sg_buffer_desc){
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.size = sizeof(par_vert)*MAX_PARTICLES,
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.type = SG_BUFFERTYPE_VERTEXBUFFER,
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.usage = SG_USAGE_STREAM,
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.label = "particle buffer"
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});
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float circleverts[8] = {
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0,0,
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0,1,
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1,0,
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1,1,
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};
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par_bind.vertex_buffers[1] = sg_make_buffer(&(sg_buffer_desc){
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.data = (sg_range){.ptr = circleverts, .size = sizeof(float)*8},
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.usage = SG_USAGE_IMMUTABLE
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});
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par_bind.fs.samplers[0] = sg_make_sampler(&(sg_sampler_desc){});
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}
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emitter *make_emitter() {
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emitter *e = calloc(sizeof(*e),1);
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e->max = 20;
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arrsetcap(e->particles, e->max);
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for (int i = 0; i < arrlen(e->particles); i++)
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e->particles[i].life = 0;
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e->life = 10;
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e->tte = lerp(e->explosiveness, e->life/e->max, 0);
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sampler_add(&e->color, 0, (HMM_Vec4){1,1,1,1});
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e->scale = 1;
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e->speed = 20;
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e->texture = texture_from_file("glass_chunk2.gif");
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arrpush(emitters,e);
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return e;
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}
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void emitter_free(emitter *e)
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{
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YughWarn("kill emitter");
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arrfree(e->particles);
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for (int i = arrlen(emitters)-1; i >= 0; i--)
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if (emitters[i] == e) {
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arrdelswap(emitters,i);
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break;
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}
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}
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void start_emitter(emitter *e) { e->on = 1; }
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void stop_emitter(emitter *e) { e->on = 0; }
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/* Variate a value around variance. Variance between 0 and 1. */
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float variate(float val, float variance)
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{
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return val + val*(frand(variance)-(variance/2));
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}
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int emitter_spawn(emitter *e)
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{
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particle p;
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p.life = e->life;
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p.pos = (HMM_Vec4){e->t.pos.x,e->t.pos.y,0,0};
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float newan = e->t.rotation.Elements[0]+(2*HMM_PI*(frand(e->divergence)-(e->divergence/2)));
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HMM_Vec2 norm = HMM_V2Rotate((HMM_Vec2){0,1}, newan);
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p.v = HMM_MulV4F((HMM_Vec4){norm.x,norm.y,0,0}, variate(e->speed, e->variation));
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p.angle = 0;
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p.scale = variate(e->scale, e->scale_var);
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// p.av = 1;
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arrput(e->particles,p);
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return 1;
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}
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void emitter_emit(emitter *e, int count)
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{
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for (int i = 0; i < count; i++)
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emitter_spawn(e);
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}
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void emitters_step(double dt)
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{
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for (int i = 0; i < arrlen(emitters); i++)
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emitter_step(emitters[i], dt);
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}
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static struct par_vert pv[MAX_PARTICLES];
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void parallel_pv(emitter *e, struct scheduler *sched, struct sched_task_partition t, sched_uint thread_num)
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{
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for (int i=t.start; i < t.end; i++) {
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if (e->particles[i].time >= e->particles[i].life) continue;
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particle *p = &e->particles[i];
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pv[i].pos = p->pos.xy;
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pv[i].angle = p->angle;
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float s = p->scale;
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if (p->time < e->grow_for)
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s = lerp(p->time/e->grow_for, 0, p->scale);
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else if (p->time > (p->life - e->shrink_for))
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s = lerp((p->time-(p->life-e->shrink_for))/e->shrink_for, p->scale, 0);
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pv[i].scale = HMM_ScaleV2(tex_get_dimensions(e->texture), s);
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pv[i].color = vec2rgba(p->color);
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}
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}
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void emitters_draw()
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{
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if (arrlen(emitters) == 0) return;
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int draw_count = 0;
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for (int i = 0; i < arrlen(emitters); i++) {
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emitter *e = emitters[i];
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par_bind.fs.images[0] = e->texture->id;
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struct sched_task task;
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scheduler_add(&sched, &task, parallel_pv, e, arrlen(e->particles), arrlen(e->particles)/sched.threads_num);
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scheduler_join(&sched, &task);
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sg_append_buffer(par_bind.vertex_buffers[0], &(sg_range){.ptr=&pv, .size=sizeof(struct par_vert)*arrlen(e->particles)});
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draw_count += arrlen(e->particles);
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}
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sg_apply_pipeline(par_pipe);
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sg_apply_uniforms(SG_SHADERSTAGE_VS, 0, SG_RANGE_REF(projection));
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sg_apply_bindings(&par_bind);
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sg_draw(0, 4, draw_count);
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}
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static double dt;
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static HMM_Vec4 g_accel;
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void parallel_step(emitter *e, struct scheduler *shed, struct sched_task_partition t, sched_uint thread_num)
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{
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for (int i = t.end-1; i >=0; i--) {
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if (e->particles[i].time >= e->particles[i].life) continue;
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if (e->warp_mask & gravmask)
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e->particles[i].v = HMM_AddV4(e->particles[i].v, g_accel);
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e->particles[i].pos = HMM_AddV4(e->particles[i].pos, HMM_MulV4F(e->particles[i].v, dt));
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e->particles[i].angle += e->particles[i].av*dt;
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e->particles[i].time += dt;
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e->particles[i].color = sample_sampler(&e->color, e->particles[i].time/e->particles[i].life);
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e->particles[i].scale = e->scale;
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if (e->particles[i].time >= e->particles[i].life)
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arrdelswap(e->particles, i);
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else if (query_point(e->particles[i].pos.xy))
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arrdelswap(e->particles,i);
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}
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}
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void emitter_step(emitter *e, double mdt) {
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dt = mdt;
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g_accel = HMM_MulV4F((HMM_Vec4){cpSpaceGetGravity(space).x, cpSpaceGetGravity(space).y, 0, 0}, dt);
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if (arrlen(e->particles) == 0) return;
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struct sched_task task;
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scheduler_add(&sched, &task, parallel_step, e, arrlen(e->particles), arrlen(e->particles)/sched.threads_num);
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scheduler_join(&sched, &task);
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if (!e->on) return;
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e->tte-=dt;
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if (e->tte <= 0) {
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emitter_spawn(e);
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e->tte = lerp(e->explosiveness, e->life/e->max,0);
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}
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}
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