Improved openGL and ImGUI implementation

include/particle.h

@@ -0,0 +1,69 @@
+#ifndef PARTICLE_H
+#define PARTICLE_H
+
+#include <stdlib.h>
+
+#define G_CONSTANT 9.807f
+
+typedef struct {
+	float x, y, z;
+} Vec3;
+
+typedef struct {
+	float r, g, b, a;
+} Color;
+
+typedef struct {
+	Vec3 position;
+	Vec3 velocity;
+	Color color;
+
+	float life;
+} Particle;
+
+// INFO: This adds adder to out, basicaly out + adder
+void vec_add(Vec3 &out, Vec3 adder) {
+	out.x += adder.x;
+	out.y += adder.y;
+	out.z += adder.z;
+}
+
+Particle particle_init(Vec3 position, Color color) {
+	Particle p;
+	p.position = position;
+	p.color = color;
+	p.velocity = {0.0f, 0.0f, 0.0f};
+
+	p.life = 10;
+	return p;
+}
+
+int particle_update(Particle *particles, unsigned long long size, float time) {
+	int alive_count = 0;
+	for (unsigned long long i = 0; i < size; i++) {
+		Particle p = particles[i];
+		if (p.life == 0) {
+			particles[i].position = {0.0f, 0.0f, 0.0f};                        // Start at center
+			particles[i].velocity = {(rand() % 100 - 50) / 50.0f, 5.0f, 0.0f}; // Random spray up
+			particles[i].life = 2.0f;                                          // Give it 2 seconds of life
+			continue;
+		}
+
+		p.velocity.y += (G_CONSTANT * time);
+
+		p.position.x += p.velocity.x * time;
+		p.position.y += p.velocity.y * time;
+		p.position.z += p.velocity.z * time;
+
+		vec_add(p.position, (p.velocity));
+
+        if (p.life > 0) p.life -= time;
+
+		particles[i] = p;
+		alive_count++;
+	}
+
+	return alive_count;
+}
+
+#endif // PARTICLE_H