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#include <raylib.h>
#include <string.h>
#include "game.h"
#include "assets.h"
#include "stdio.h"
#include "player.h"
#include "background.h"
Game game;
static inline bool EntityAllocated(const Entity* e) {
return (e->flags & ENTITY_ALLOCATED);
}
static inline bool PhysicsEnabled(const Entity* e) {
return EntityAllocated(e) && (e->flags & ENTITY_PHYSICS_ACTIVE);
}
static inline bool ShouldDrawEntity(const Entity* e, DrawLayer layerDrawing) {
return EntityAllocated(e)
&& (e->flags & ENTITY_VISIBLE)
&& (layerDrawing == e->drawLayer);
}
static inline bool SameEntity(const Entity* a, const Entity* b) {
return a->id == b->id;
}
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;
}
static inline Rectangle GetDrawDestinationRectGlobal(const Entity* e) {
Rectangle destRectGlobal = e->destRect;
destRectGlobal.x += e->position.x;
destRectGlobal.y += e->position.y;
return destRectGlobal;
}
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;
}
void AddEntity(Entity* e) {
static int nextId = 0;
e->id = nextId++;
e->flags |= ENTITY_ALLOCATED;
for(int i = 0; i < MAX_ENTITY_COUNT; i++) {
if (!EntityAllocated(&game.entities[i])) {
game.entities[i] = *e;
break;
}
}
}
void InitGame() {
game.paused = false;
LoadAssets();
memset(game.entities, 0, sizeof(game.entities));
}
void UpdateEntity(Entity* e, float deltaTime) {
switch (e->type) {
case Player_Entity:
UpdatePlayer(e, deltaTime);
break;
case Background_Entity:
UpdateBackground(e, deltaTime);
break;
default:
break;
}
}
void UpdateGame(float deltaTime) {
#ifdef BEATEMUP_DEBUG
if (IsKeyPressed(KEY_D) && IsKeyDown(KEY_ENTER)) {
game.enableDebugOverlay = !game.enableDebugOverlay;
}
#endif
for (int i = 0; i < MAX_ENTITY_COUNT; i++) {
Entity* e = &game.entities[i];
if (EntityAllocated(e))
UpdateEntity(e, deltaTime);
}
}
#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
void DefaultDrawEntity(const Entity* e) {
Rectangle srcRect = {0, 0, e->texture.width, e->texture.height};
Vector2 origin = {0.0f, 0.0f};
float rotation = 0.0f;
Rectangle destRect = GetDrawDestinationRectGlobal(e);
DrawTexturePro(e->texture, srcRect, destRect, origin, rotation, WHITE);
}
void DrawEntity(const Entity* e) {
switch (e->type) {
default:
DefaultDrawEntity(e);
}
}
void DrawGame() {
BeginDrawing();
ClearBackground(RAYWHITE);
for (DrawLayer layer = Background_Layer; layer <= Foreground_Layer; layer++) {
for (int j = 0; j < MAX_ENTITY_COUNT; j++) {
Entity* currentEntity = &game.entities[j];
if (ShouldDrawEntity(currentEntity, layer))
DrawEntity(currentEntity);
}
}
#ifdef BEATEMUP_DEBUG
for (int i = 0; i < MAX_ENTITY_COUNT; i++) {
if (game.enableDebugOverlay)
DebugHighlights(&game.entities[i]);
}
#endif
EndDrawing();
}
void AddWall(float xpos, float ypos, float width, float height) {
Entity wall = {0};
wall.type = Wall_Entity;
wall.flags |= ENTITY_PHYSICS_ACTIVE;
wall.position = (Vector2) {xpos, ypos};
wall.physicsCollider = (Rectangle) {0, 0, width, height};
#ifdef BEATEMUP_DEBUG
wall.physicsColliderColor = BLUE;
#endif
AddEntity(&wall);
}
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