129 lines
4.6 KiB
C
129 lines
4.6 KiB
C
#define BECS_MAX_ENTITIES 100000
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#define BECS_MAX_COMPONENTS 4
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#define BECS_IMPLEMENTATION
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#include "../../becs.h"
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#include <stdlib.h>
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#include <stdio.h>
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#include "external/raylib/src/raylib.h"
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// Component structs
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typedef struct {
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float x, y;
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} Position;
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typedef struct {
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float vx, vy;
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} Velocity;
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typedef struct {
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float ax, ay;
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} Acceleration;
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typedef struct {
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float radius;
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float lifetime;
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} ParticleData;
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// Function to spawn a particle
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void SpawnParticle(BECS_ECS *ecs, BECS_ComponentID posID, BECS_ComponentID velID, BECS_ComponentID accID, BECS_ComponentID dataID, float x, float y) {
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BECS_Entity entity = BECS_EntityCreate(ecs);
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if (entity == BECS_NULL_ENTITY) return;
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Position *pos = (Position *)BECS_ComponentAdd(ecs, entity, posID);
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pos->x = x;
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pos->y = y;
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Velocity *vel = (Velocity *)BECS_ComponentAdd(ecs, entity, velID);
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vel->vx = GetRandomValue(-100, 100);
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vel->vy = GetRandomValue(-200, -50);
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Acceleration *acc = (Acceleration *)BECS_ComponentAdd(ecs, entity, accID);
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acc->ax = 0.0f;
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acc->ay = 100.0f; // Gravity
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ParticleData *data = (ParticleData *)BECS_ComponentAdd(ecs, entity, dataID);
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data->radius = 5.0f;
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data->lifetime = 2.0f;
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}
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int main(void) {
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// Initialize ECS
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size_t componentSizes[4] = {sizeof(Position), sizeof(Velocity), sizeof(Acceleration), sizeof(ParticleData)};
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size_t memSize = BECS_GetMinMemoryArenaSize(componentSizes, 4);
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printf("%lu\n", memSize);
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char *memory = (char *)malloc(memSize);
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BECS_ECS ecs = BECS_InitECS(memory, memSize);
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// Register components
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BECS_ComponentID posID = BECS_ComponentRegister(&ecs, sizeof(Position), BECS_MAX_ENTITIES);
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BECS_ComponentID velID = BECS_ComponentRegister(&ecs, sizeof(Velocity), BECS_MAX_ENTITIES);
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BECS_ComponentID accID = BECS_ComponentRegister(&ecs, sizeof(Acceleration), BECS_MAX_ENTITIES);
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BECS_ComponentID dataID = BECS_ComponentRegister(&ecs, sizeof(ParticleData), BECS_MAX_ENTITIES);
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InitWindow(1600, 800, "2D Particle System with BECS");
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while (!WindowShouldClose()) {
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float dt = GetFrameTime();
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// Update lifetimes and despawn
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for (BECS_Entity entity = 0; entity < BECS_MAX_ENTITIES; entity++) {
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if (!BECS_IsEntityAlive(&ecs, entity)) continue;
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if (BECS_ComponentHas(&ecs, entity, dataID)) {
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ParticleData *data = (ParticleData *)BECS_ComponentGet(&ecs, entity, dataID);
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data->lifetime -= dt;
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if (data->lifetime <= 0.0f) {
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BECS_EntityDestroy(&ecs, entity);
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}
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}
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}
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// Spawn particle on mouse click
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if (IsMouseButtonDown(MOUSE_LEFT_BUTTON)) {
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Vector2 mousePos = GetMousePosition();
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for (uint32_t i = 0; i < 10; i++)
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{
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SpawnParticle(&ecs, posID, velID, accID, dataID, mousePos.x, mousePos.y);
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}
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}
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// Physics system: update position and velocity
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for (BECS_Entity entity = 0; entity < BECS_MAX_ENTITIES; entity++) {
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if (!BECS_IsEntityAlive(&ecs, entity)) continue;
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if (BECS_ComponentHas(&ecs, entity, posID) &&
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BECS_ComponentHas(&ecs, entity, velID) &&
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BECS_ComponentHas(&ecs, entity, accID)) {
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Position *pos = (Position *)BECS_ComponentGet(&ecs, entity, posID);
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Velocity *vel = (Velocity *)BECS_ComponentGet(&ecs, entity, velID);
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Acceleration *acc = (Acceleration *)BECS_ComponentGet(&ecs, entity, accID);
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vel->vx += acc->ax * dt;
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vel->vy += acc->ay * dt;
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pos->x += vel->vx * dt;
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pos->y += vel->vy * dt;
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}
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}
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BeginDrawing();
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ClearBackground(BLACK);
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// Render system: draw particles
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for (BECS_Entity entity = 0; entity < BECS_MAX_ENTITIES; entity++) {
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if (!BECS_IsEntityAlive(&ecs, entity)) continue;
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if (BECS_ComponentHas(&ecs, entity, posID) && BECS_ComponentHas(&ecs, entity, dataID)) {
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Position *pos = (Position *)BECS_ComponentGet(&ecs, entity, posID);
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ParticleData *data = (ParticleData *)BECS_ComponentGet(&ecs, entity, dataID);
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float alpha = data->lifetime / 2.0f;
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Color color = {255, 255, 255, (unsigned char)(alpha * 255)};
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DrawCircle((int)pos->x, (int)pos->y, data->radius, color);
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}
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}
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DrawText(TextFormat("Particles: %u", ecs.entityCount), 10, 10, 20, WHITE);
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EndDrawing();
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}
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CloseWindow();
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free(memory);
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return 0;
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}
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