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#include "physics.h"
#include "game.h"
extern Game game;
static inline bool PhysicsEnabled(const Entity* e) {
return EntityAllocated(e) && (e->flags & ENTITY_PHYSICS_ACTIVE);
}
static inline bool IsColliding(const Rectangle* a, const Rectangle* b) {
bool collisionX = (a->x <= b->x && a->x + a->width > b->x)
|| (b->x <= a->x && b->x + b->width > a->x);
bool collisionY = (a->y <= b->y && a->y + a->height > b->y)
|| (b->y <= a->y && b->y + b->height > a->y);
return collisionX && collisionY;
}
static inline Rectangle GetPhysicsColliderGlobal(const Entity* e) {
Rectangle physicsColliderGlobal = e->physicsCollider;
physicsColliderGlobal.x += e->position.x;
physicsColliderGlobal.y += e->position.y;
return physicsColliderGlobal;
}
void MoveAndSlide(Entity* e, float deltaTime) {
Vector2 velocity = e->velocity;
Rectangle physicsCollider = GetPhysicsColliderGlobal(e);
physicsCollider.x += e->velocity.x * deltaTime;
for (int i = 0; i < MAX_ENTITY_COUNT; i++) {
Entity* c = &game.entities[i];
if(!PhysicsEnabled(c) || SameEntity(c, e)) continue;
Rectangle otherCollider = GetPhysicsColliderGlobal(c);
if(IsColliding(&physicsCollider, &otherCollider)) {
if (velocity.x > 0) {
physicsCollider.x = otherCollider.x - physicsCollider.width;
} else {
physicsCollider.x = otherCollider.x + otherCollider.width;
}
}
}
physicsCollider.y += e->velocity.y * deltaTime;
for (int i = 0; i < MAX_ENTITY_COUNT; i++) {
Entity* c = &game.entities[i];
if(!PhysicsEnabled(c) || SameEntity(c, e)) continue;
Rectangle otherCollider = GetPhysicsColliderGlobal(c);
if(IsColliding(&physicsCollider, &otherCollider)) {
if (velocity.y > 0) {
physicsCollider.y = otherCollider.y - physicsCollider.height;
} else {
physicsCollider.y = otherCollider.y + otherCollider.height;
}
}
}
e->position.x = physicsCollider.x;
e->position.y = physicsCollider.y;
}
#ifdef BEATEMUP_DEBUG
void DebugHighlights(const Entity* e) {
if (!PhysicsEnabled(e))
return;
Rectangle dstRect = GetPhysicsColliderGlobal(e);
DrawRectangle(dstRect.x, dstRect.y, dstRect.width, dstRect.height, e->physicsColliderColor);
}
#endif
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