Fixed PhysicsSolver, added zoom, linear_damping

src/physics/PhysicsSolver.cpp

@@ -4,7 +4,7 @@
 
 #include <iostream>
 
-#define E 0.01
+#define E 0.03
 
 PhysicsSolver::PhysicsSolver(vec3 gravity) : gravity(gravity) {
 }
@@ -12,6 +12,7 @@ PhysicsSolver::PhysicsSolver(vec3 gravity) : gravity(gravity) {
 void PhysicsSolver::step(Chunks* chunks, Hitbox* hitbox, float delta, unsigned substeps, bool shifting) {
 	for (unsigned i = 0; i < substeps; i++){
 		float dt = delta / (float)substeps;
+		float linear_damping = hitbox->linear_damping;
 		vec3& pos = hitbox->position;
 		vec3& half = hitbox->halfsize;
 		vec3& vel = hitbox->velocity;
@@ -76,6 +77,7 @@ void PhysicsSolver::step(Chunks* chunks, Hitbox* hitbox, float delta, unsigned s
 		hitbox->grounded = false;
 		if (vel.y < 0.0){
 			for (int x = floor(pos.x-half.x+E); x <= floor(pos.x+half.x-E); x++){
+				bool broken = false;
 				for (int z = floor(pos.z-half.z+E); z <= floor(pos.z+half.z-E); z++){
 					int y = floor(pos.y-half.y-E);
 					if (chunks->isObstacle(x,y,z)){
@@ -85,9 +87,12 @@ void PhysicsSolver::step(Chunks* chunks, Hitbox* hitbox, float delta, unsigned s
 						vel.x *= max(0.0, 1.0 - dt * f);
 						vel.z *= max(0.0, 1.0 - dt * f);
 						hitbox->grounded = true;
+						broken = true;
 						break;
 					}
 				}
+				if (broken)
+					break;
 			}
 		}
 		if (vel.y > 0.0){
@@ -103,6 +108,9 @@ void PhysicsSolver::step(Chunks* chunks, Hitbox* hitbox, float delta, unsigned s
 			}
 		}
 
+		vel.x *= max(0.0, 1.0 - dt * linear_damping);
+		vel.z *= max(0.0, 1.0 - dt * linear_damping);
+
 		pos.x += vel.x * dt;
 		pos.y += vel.y * dt;
 		pos.z += vel.z * dt;