Adding ECS

CMakeLists.txt

@@ -15,6 +15,11 @@ set(SOURCES
   src/vector2d.c
   src/linked_list.c
   src/texture_manager.c
+  src/ecs/ecs.c
+  src/ecs/transform_component.c
+  src/ecs/sprite_component.c
+  src/ecs/animation_system.c
+  src/ecs/player_system.c
 )
 
 # fx-CG-50-only assets

src/ecs/animation_system.c

@@ -0,0 +1,111 @@
+#include <gint/kmalloc.h>
+#include "animation_system.h"
+#include "../game.h"
+
+// Args : size_t nb_frames, size_t actual_frame, float frame_delay_ms, bool play, bool loop, bool reverse
+void animation_system_init(component_t *component, va_list args)
+{
+    animation_system_data_t *system_data = component->component_data.animation_system_data;
+
+    system_data->sprite_component_data = get_component(component->entity, SPRITE_COMPONENT)->component_data.sprite_component_data;
+
+    system_data->nb_frames = va_arg(args, size_t);
+    system_data->actual_frame_nb= va_arg(args, size_t);
+    system_data->frame_delay_ms = (float)va_arg(args, double);
+    system_data->play = (bool)va_arg(args, int);
+    system_data->loop = (bool)va_arg(args, int);
+    system_data->reverse = (bool)va_arg(args, int);
+
+    system_data->frame_timer_ms = 0;
+
+    linked_list_init(&system_data->frames, sizeof(rect_t), NULL);
+
+    animation_system_create_frames_clips(system_data);
+}
+
+void animation_system_update(component_t *component)
+{
+    animation_system_data_t *system_data = component->component_data.animation_system_data;
+
+    if(system_data->play)
+    {
+        system_data->frame_timer_ms += (float)game.delta_time_ms;
+
+        if(system_data->frame_timer_ms >= system_data->frame_delay_ms)
+        {
+            system_data->frame_timer_ms = 0;
+
+            if(system_data->reverse)
+            {
+                if(system_data->actual_frame->prev)
+                {
+                    system_data->actual_frame = system_data->actual_frame->prev;
+                    system_data->actual_frame_nb--;
+                }
+                else if(!system_data->loop)
+                {
+                    system_data->play = false;
+                }
+                else
+                {
+                    system_data->actual_frame = system_data->frames.last;
+                    system_data->actual_frame_nb = system_data->frames.size - 1;
+                }
+            }
+            else
+            {
+                if(system_data->actual_frame->next)
+                {
+                    system_data->actual_frame = system_data->actual_frame->next;
+                    system_data->actual_frame_nb++;
+                }
+                else if(!system_data->loop)
+                {
+                    system_data->play = false;
+                }
+                else
+                {
+                    system_data->actual_frame = system_data->frames.first;
+                    system_data->actual_frame_nb = 0;
+                }
+            }
+        }
+
+        system_data->sprite_component_data->srcR = *(rect_t *)system_data->actual_frame->data;
+    }
+}
+
+inline void animation_system_destroy(component_t *component)
+{
+    linked_list_clear(&component->component_data.animation_system_data->frames);
+    kfree(component->component_data.animation_system_data);
+}
+
+void animation_system_create_frames_clips(animation_system_data_t *system_data)
+{
+    linked_list_clear(&system_data->frames);
+
+    rect_t *sprite_srcR = &system_data->sprite_component_data->srcR;
+
+    for(size_t actual_frame_nb = 0; actual_frame_nb < system_data->nb_frames; actual_frame_nb++)
+    {
+        elem_t *frame = elem_create(&system_data->frames);
+
+        ((rect_t *)frame->data)->x = sprite_srcR->w * (float)actual_frame_nb;
+        ((rect_t *)frame->data)->y = 0;
+        ((rect_t *)frame->data)->w = sprite_srcR->w;
+        ((rect_t *)frame->data)->h = sprite_srcR->h;
+
+        linked_list_push_back_elem(&system_data->frames, frame);
+    }
+
+    system_data->actual_frame = linked_list_get_elem(&system_data->frames, system_data->actual_frame_nb);
+}
+
+inline void animation_system_change_animation(animation_system_data_t *system_data, const char *name, size_t nb_frames)
+{
+    system_data->nb_frames = nb_frames;
+    sprite_component_set_texture(system_data->sprite_component_data, name);
+    animation_system_create_frames_clips(system_data);
+    system_data->sprite_component_data->srcR = *(rect_t *)system_data->actual_frame->data;
+}

src/ecs/animation_system.h

@@ -0,0 +1,34 @@
+#ifndef ANIMATION_SYSTEM_H
+#define ANIMATION_SYSTEM_H
+
+#include "ecs.h"
+#include "sprite_component.h"
+
+typedef struct animation_system_data_t {
+    sprite_component_data_t *sprite_component_data;
+
+    bool play :1;
+    bool loop :1;
+    bool reverse :1;
+
+    float frame_delay_ms;
+    float frame_timer_ms;
+
+    elem_t *actual_frame;
+    size_t actual_frame_nb;
+
+    size_t nb_frames;
+    linked_list_t frames;
+} animation_system_data_t;
+
+void animation_system_init(component_t *, va_list);
+
+void animation_system_update(component_t *);
+
+void animation_system_destroy(component_t *);
+
+void animation_system_create_frames_clips(animation_system_data_t *);
+
+void animation_system_change_animation(animation_system_data_t *, const char *, size_t);
+
+#endif // SPRITE_COMPONENT_H

src/ecs/components.h

@@ -0,0 +1,10 @@
+#ifndef COMPONENTS_H
+#define COMPONENTS_H
+
+#include "transform_component.h"
+#include "sprite_component.h"
+#include "animation_system.h"
+#include "player_system.h"
+// Add new components header file here
+
+#endif // COMPONENTS_H

src/ecs/ecs.c

@@ -0,0 +1,194 @@
+#include <gint/kmalloc.h>
+#include <stdarg.h>
+#include "ecs.h"
+#include "components.h"
+
+component_t *create_component(component_type_t component_type)
+{
+    component_t *component = kmalloc(sizeof(component_t), NULL);
+    component->component_type = component_type;
+
+    switch(component_type)
+    {
+      case TRANSFORM_COMPONENT:
+        component->component_init = transform_component_init;
+        component->component_update = transform_component_update;
+        component->component_draw = NULL;
+
+        component->component_data.transform_component_data = kmalloc(sizeof(transform_component_data_t), NULL);
+        if(!component->component_data.transform_component_data) return NULL;
+
+        component->component_deleter = transform_component_destroy;
+        break;
+
+      case SPRITE_COMPONENT:
+        component->component_init = sprite_component_init;
+        component->component_update = sprite_component_update;
+        component->component_draw = sprite_component_draw;
+
+        component->component_data.sprite_component_data = kmalloc(sizeof(sprite_component_data_t), NULL);
+        if(!component->component_data.sprite_component_data) return NULL;
+
+        component->component_deleter = sprite_component_destroy;
+        break;
+
+      case ANIMATION_SYSTEM:
+        component->component_init = animation_system_init;
+        component->component_update = animation_system_update;
+        component->component_draw = NULL;
+
+        component->component_data.animation_system_data = kmalloc(sizeof(animation_system_data_t), NULL);
+        if(!component->component_data.animation_system_data) return NULL;
+
+        component->component_deleter = animation_system_destroy;
+        break;
+
+      case PLAYER_SYSTEM:
+        component->component_init = player_system_init;
+        component->component_update = player_system_update;
+        component->component_draw = NULL;
+
+        component->component_data.player_system_data = kmalloc(sizeof(player_system_data_t), NULL);
+        if(!component->component_data.player_system_data) return NULL;
+
+        component->component_deleter = player_system_destroy;
+        break;
+
+      // Add new components attributions here
+
+      default:
+        return NULL;
+    }
+
+    return component;
+}
+
+inline void destroy_component(component_t *component)
+{
+    component->component_deleter(component);
+    kfree(component);
+}
+
+entity_t *create_entity(const char *name)
+{
+    entity_t *entity = kmalloc(sizeof(entity_t), NULL);
+    if(!entity) return NULL;
+
+    entity->name = name;
+    entity->draw_priority = 0;
+    linked_list_init(&entity->components, sizeof(component_t), (deleter_t)destroy_component);
+
+    return entity;
+}
+
+void add_component(entity_t *entity, component_t *component, ...)
+{
+    if(!component) return;
+
+    component->entity = entity;
+
+    va_list args, args_copy;
+    va_start(args, component);
+    va_copy(args_copy, args);
+
+    component->component_init(component, args_copy);
+
+    va_end(args_copy);
+    va_end(args);
+
+    linked_list_push_back(&entity->components, component);
+}
+
+// Only for this file
+// Arg : component_type_t component_type
+static inline bool condition_is_component_type(elem_t *elem, va_list args)
+{
+    return ((component_t *)elem->data)->component_type == va_arg(args, component_type_t);
+}
+
+inline component_t *get_component(entity_t *entity, component_type_t component_type)
+{
+    return linked_list_get_if(&entity->components, condition_is_component_type, component_type);
+}
+
+// Only for this file
+// No args
+static inline void action_update_component(elem_t *elem, va_list args __attribute__((unused)))
+{
+    component_t *component = elem->data;
+    component->component_update(component);
+}
+
+inline void update_entity(entity_t *entity)
+{
+    linked_list_for_each(&entity->components, action_update_component);
+}
+
+// Only for this file
+// No args
+static inline void action_draw_component(elem_t *elem, va_list args __attribute__((unused)))
+{
+    component_t *component = elem->data;
+    if(component->component_draw) component->component_draw(component);
+}
+
+inline void draw_entity(entity_t *entity)
+{
+    linked_list_for_each(&entity->components, action_draw_component);
+}
+
+inline void destroy_entity(entity_t *entity)
+{
+    linked_list_clear(&entity->components);
+    kfree(entity);
+}
+
+inline void entity_manager_init(entity_manager_t *entity_manager)
+{
+    linked_list_init(&entity_manager->entities, sizeof(entity_t), (deleter_t)destroy_entity);
+}
+
+inline entity_t *entity_manager_add_entity(entity_manager_t *entity_manager, const char *name)
+{
+    entity_t *entity = create_entity(name);
+    linked_list_push_back(&entity_manager->entities, entity);
+    return entity;
+}
+
+// Only for this file
+static inline void action_update_entity(elem_t *elem, va_list args __attribute__((unused)))
+{
+    update_entity(elem->data);
+}
+
+inline void entity_manager_update(entity_manager_t *entity_manager)
+{
+    linked_list_for_each(&entity_manager->entities, action_update_entity);
+}
+
+// Only for this file
+static inline void action_draw_entity(elem_t *elem, va_list args __attribute__((unused)))
+{
+    draw_entity(elem->data);
+}
+
+inline void entity_manager_draw(entity_manager_t *entity_manager)
+{
+    linked_list_for_each(&entity_manager->entities, action_draw_entity);
+}
+
+// Only for this file
+static inline bool condition_is_entity_name(elem_t *elem, va_list args)
+{
+    return ((entity_t *)elem->data)->name == va_arg(args, const char *);
+}
+
+inline void entity_manager_remove_entity(entity_manager_t *entity_manager, const char *name)
+{
+    linked_list_remove_if(&entity_manager->entities, condition_is_entity_name, name);
+}
+
+inline void entity_manager_clear(entity_manager_t *entity_manager)
+{
+    linked_list_clear(&entity_manager->entities);
+}

src/ecs/ecs.h

@@ -0,0 +1,84 @@
+#ifndef ECS_H
+#define ECS_H
+
+#include <stdarg.h>
+#include "../linked_list.h"
+
+typedef enum component_type_t {
+    TRANSFORM_COMPONENT,
+    SPRITE_COMPONENT,
+    ANIMATION_SYSTEM,
+    PLAYER_SYSTEM
+} component_type_t;
+
+typedef struct transform_component_data_t transform_component_data_t;
+typedef struct sprite_component_data_t sprite_component_data_t;
+typedef struct animation_system_data_t animation_system_data_t;
+typedef struct player_system_data_t player_system_data_t;
+
+typedef struct component_t component_t;
+
+typedef void (*component_init_t)(component_t *, va_list);
+typedef void (*component_update_t)(component_t *);
+typedef void (*component_draw_t)(component_t *);
+
+typedef void (*component_deleter_t)(component_t *);
+
+typedef struct component_t {
+    component_type_t component_type;
+
+    struct entity_t *entity;
+
+    component_init_t component_init;
+    component_update_t component_update;
+    component_draw_t component_draw;
+
+    union {
+        transform_component_data_t *transform_component_data;
+        sprite_component_data_t *sprite_component_data;
+        animation_system_data_t *animation_system_data;
+        player_system_data_t *player_system_data;
+    } component_data;
+
+    component_deleter_t component_deleter;
+} component_t;
+
+component_t *create_component(component_type_t);
+
+void destroy_component(component_t *);
+
+typedef struct entity_t {
+    const char *name;
+    size_t draw_priority;
+    linked_list_t components;
+} entity_t;
+
+entity_t *create_entity(const char *name);
+
+void add_component(entity_t *, component_t *, ...);
+
+component_t *get_component(entity_t *, component_type_t);
+
+void update_entity(entity_t *);
+
+void draw_entity(entity_t *);
+
+void destroy_entity(entity_t *);
+
+typedef struct entity_manager_t {
+    linked_list_t entities;
+} entity_manager_t;
+
+void entity_manager_init(entity_manager_t *);
+
+entity_t *entity_manager_add_entity(entity_manager_t *, const char *);
+
+void entity_manager_update(entity_manager_t *);
+
+void entity_manager_draw(entity_manager_t *);
+
+void entity_manager_remove_entity(entity_manager_t *, const char *);
+
+void entity_manager_clear(entity_manager_t *);
+
+#endif // ECS_H

src/ecs/player_system.c

@@ -0,0 +1,79 @@
+#include <gint/kmalloc.h>
+#include "player_system.h"
+#include "animation_system.h"
+#include "sprite_component.h"
+#include "transform_component.h"
+#include "../game.h"
+
+// No args
+void player_system_init(component_t *component, va_list args __attribute__((unused)))
+{
+    player_system_data_t *system_data = component->component_data.player_system_data;
+
+    system_data->animation_system_data = get_component(component->entity, ANIMATION_SYSTEM)->component_data.animation_system_data;
+    system_data->sprite_component_data = system_data->animation_system_data->sprite_component_data;
+    system_data->transform_component_data = system_data->sprite_component_data->transform_component_data;
+
+    system_data->state = IDLE;
+}
+
+// Only for this file
+static void player_system_get_inputs(component_t *component)
+{
+    player_system_data_t *system_data = component->component_data.player_system_data;
+
+    system_data->last_state = system_data->state;
+
+    system_data->state &= 0xF0;
+
+    system_data->state |= game.event.keys[KEY_UP] * RUNNING_UP;
+    system_data->state |= game.event.keys[KEY_DOWN] * RUNNING_DOWN;
+    system_data->state |= game.event.keys[KEY_LEFT] * RUNNING_LEFT;
+    system_data->state |= game.event.keys[KEY_RIGHT] * RUNNING_RIGHT;
+}
+
+// Only for this file
+static void player_system_set_state_velocity_and_animation(component_t *component)
+{
+    player_system_data_t *system_data = component->component_data.player_system_data;
+    transform_component_data_t *transform_component_data = system_data->transform_component_data;
+    sprite_component_data_t *sprite_component_data = system_data->sprite_component_data;
+    animation_system_data_t *animation_system_data = system_data->animation_system_data;
+
+    transform_component_data->velocity.x =
+        (float)((system_data->state & RUNNING_RIGHT) >> 3) - (float)((system_data->state & RUNNING_LEFT) >> 2);
+    transform_component_data->velocity.y =
+        (float)((system_data->state & RUNNING_DOWN) >> 1) - (float)(system_data->state & RUNNING_UP);
+
+    if(system_data->state & RUNNING_LEFT) sprite_component_data->flip = true;
+    if(system_data->state & RUNNING_RIGHT) sprite_component_data->flip = false;
+
+    if(is_not_zero(transform_component_data->velocity.x) && is_not_zero(transform_component_data->velocity.y))
+    {
+        transform_component_data->velocity.x *= 0.707106781186548f;
+        transform_component_data->velocity.y *= 0.707106781186548f;
+    }
+
+    if((system_data->state & RUNNING) && !(system_data->last_state & RUNNING))
+    {
+        animation_system_data->frame_delay_ms = 200;
+        animation_system_change_animation(animation_system_data, "player_run_sheet", 6);
+    }
+    else if(!(system_data->state & RUNNING) && (system_data->last_state & RUNNING))
+    {
+        animation_system_data->actual_frame_nb = 0;
+        animation_system_data->frame_delay_ms = 200;
+        animation_system_change_animation(animation_system_data, "player_idle_sheet", 4);
+    }
+}
+
+void player_system_update(component_t *component)
+{
+    player_system_get_inputs(component);
+    player_system_set_state_velocity_and_animation(component);
+}
+
+void player_system_destroy(component_t *component)
+{
+    kfree(component->component_data.player_system_data);
+}

src/ecs/player_system.h

@@ -0,0 +1,32 @@
+#ifndef PLAYER_SYSTEM_H
+#define PLAYER_SYSTEM_H
+
+#include "ecs.h"
+#include "transform_component.h"
+
+typedef enum player_state_t {
+    IDLE          = 0x00, // 00000000
+    RUNNING_UP    = 0x01, // 00000001
+    RUNNING_DOWN  = 0x02, // 00000010
+    RUNNING_LEFT  = 0x04, // 00000100
+    RUNNING_RIGHT = 0x08, // 00001000
+    RUNNING       = 0x0F, // 00001111
+    DEATH         = 0x80  // 10000000
+} player_state_t;
+
+typedef struct player_system_data_t {
+    transform_component_data_t *transform_component_data;
+    sprite_component_data_t *sprite_component_data;
+    animation_system_data_t *animation_system_data;
+
+    player_state_t state;
+    player_state_t last_state;
+} player_system_data_t;
+
+void player_system_init(component_t *, va_list);
+
+void player_system_update(component_t *);
+
+void player_system_destroy(component_t *);
+
+#endif // PLAYER_SYSTEM_H

src/ecs/sprite_component.c

@@ -0,0 +1,41 @@
+#include <gint/kmalloc.h>
+#include "sprite_component.h"
+#include "../game.h"
+
+// Arg : const char *name
+void sprite_component_init(component_t *component, va_list args)
+{
+    sprite_component_data_t *component_data = component->component_data.sprite_component_data;
+
+    component_data->transform_component_data = get_component(component->entity, TRANSFORM_COMPONENT)->component_data.transform_component_data;
+
+    component_data->srcR = component_data->transform_component_data->bounds;
+    component_data->srcR.x = 0;
+    component_data->srcR.y = 0;
+
+    component_data->flip = false;
+
+    sprite_component_set_texture(component_data, va_arg(args, const char *));
+}
+
+inline void sprite_component_update(component_t *component)
+{
+    sprite_component_data_t *component_data = component->component_data.sprite_component_data;
+    component_data->dstR = component_data->transform_component_data->bounds;
+}
+
+inline void sprite_component_draw(component_t *component)
+{
+    sprite_component_data_t *component_data = component->component_data.sprite_component_data;
+    draw_texture(component_data->texture, &component_data->srcR, &component_data->dstR, component_data->flip);
+}
+
+inline void sprite_component_destroy(component_t *component)
+{
+    kfree(component->component_data.sprite_component_data);
+}
+
+inline void sprite_component_set_texture(sprite_component_data_t *component_data, const char *name)
+{
+    component_data->texture = texture_manager_get_texture(&game.texture_manager, name);
+}

src/ecs/sprite_component.h

@@ -0,0 +1,29 @@
+#ifndef SPRITE_COMPONENT_H
+#define SPRITE_COMPONENT_H
+
+#include "ecs.h"
+#include "transform_component.h"
+#include "../texture_manager.h"
+
+typedef struct sprite_component_data_t {
+    transform_component_data_t *transform_component_data;
+
+    texture_t *texture;
+
+    rect_t srcR;
+    rect_t dstR;
+
+    bool flip;
+} sprite_component_data_t;
+
+void sprite_component_init(component_t *, va_list);
+
+void sprite_component_update(component_t *);
+
+void sprite_component_draw(component_t *);
+
+void sprite_component_destroy(component_t *);
+
+void sprite_component_set_texture(sprite_component_data_t *, const char *);
+
+#endif // SPRITE_COMPONENT_H

src/ecs/transform_component.c

@@ -0,0 +1,32 @@
+#include <gint/kmalloc.h>
+#include "transform_component.h"
+#include "../game.h"
+
+// Args : rect_t bounds, double speed
+void transform_component_init(component_t *component, va_list args)
+{
+    transform_component_data_t *const component_data = component->component_data.transform_component_data;
+
+    rect_t bounds  = va_arg(args, rect_t);
+    float speed = (float)va_arg(args, double);
+
+    component_data->bounds = bounds;
+
+    component_data->velocity.x = 0;
+    component_data->velocity.y = 0;
+
+    component_data->speed = speed;
+}
+
+void transform_component_update(component_t *component)
+{
+    transform_component_data_t *component_data = component->component_data.transform_component_data;
+
+    component_data->bounds.x += component_data->velocity.x * component_data->speed * (float)game.delta_time_ms / 1000.0f;
+    component_data->bounds.y += component_data->velocity.y * component_data->speed * (float)game.delta_time_ms / 1000.0f;
+}
+
+inline void transform_component_destroy(component_t *component)
+{
+    kfree(component->component_data.transform_component_data);
+}

src/ecs/transform_component.h

@@ -0,0 +1,19 @@
+#ifndef TRANSFORM_COMPONENT_H
+#define TRANSFORM_COMPONENT_H
+
+#include "ecs.h"
+#include "../vector2d.h"
+
+typedef struct transform_component_data_t {
+    rect_t bounds;
+    vector2d_t velocity;
+    float speed;
+} transform_component_data_t;
+
+void transform_component_init(component_t *, va_list);
+
+void transform_component_update(component_t *);
+
+void transform_component_destroy(component_t *);
+
+#endif // TRANSFORM_COMPONENT_H

src/event.h

@@ -3,7 +3,8 @@
 
 #include <gint/keycodes.h>
 
-typedef struct {
+// Base struct
+typedef struct event_t {
     bool keys[0xa6];
 } event_t;
 

src/game.c

@@ -1,11 +1,69 @@
-#include <gint/kmalloc.h>
+#include <gint/keyboard.h>
+#include <gint/display.h>
 #include "game.h"
+#include "ecs/components.h"
 
-int game_init(game_t *game)
+void game_init(void)
 {
-    game = kmalloc(sizeof(game_t), NULL);
+    texture_manager_init(&game.texture_manager);
+    texture_manager_load_builtin_textures(&game.texture_manager);
 
-    if(game == NULL) return 1;
+    entity_manager_init(&game.entity_manager);
 
-    return 0;
+    entity_t *player = entity_manager_add_entity(&game.entity_manager, "player");
+
+    rect_t player_bounds = {10.0f, 10.0f, 32.0f, 32.0f};
+    float player_speed = 50.0f;
+
+    add_component(player, create_component(TRANSFORM_COMPONENT), player_bounds, player_speed);
+    add_component(player, create_component(SPRITE_COMPONENT), "player_idle_sheet");
+    add_component(player, create_component(ANIMATION_SYSTEM), 4, 0, 200.0f, true, true, false);
+    add_component(player, create_component(PLAYER_SYSTEM));
+
+    game.last_clock_state = clock();
+
+    game.is_running = true;
+}
+
+void game_handle_event(void)
+{
+    key_event_t key_event;
+
+    do
+    {
+        key_event = pollevent();
+
+        if (key_event.type == KEYEV_DOWN)
+            game.event.keys[key_event.key] = true;
+        else if (key_event.type == KEYEV_UP)
+            game.event.keys[key_event.key] = false;
+
+        if (key_event.type == KEYEV_DOWN && key_event.key == KEY_EXIT)
+            game.is_running = false;
+    }
+    while (key_event.type != KEYEV_NONE);
+}
+
+void game_update(void)
+{
+    clock_t start_clock = clock();
+    game.delta_time_ms = (double)(start_clock - game.last_clock_state) * 1000.0f / CLOCKS_PER_SEC;
+    game.last_clock_state = start_clock;
+
+    entity_manager_update(&game.entity_manager);
+}
+
+void game_render(void)
+{
+    dclear(C_WHITE);
+
+    entity_manager_draw(&game.entity_manager);
+
+    dupdate();
+}
+
+void game_exit(void)
+{
+    entity_manager_clear(&game.entity_manager);
+    texture_manager_clear(&game.texture_manager);
 }

src/game.h

@@ -1,25 +1,31 @@
 #ifndef GAME_H
 #define GAME_H
 
-#include <gint/defs/types.h>
+#include <time.h>
 #include "event.h"
 #include "texture_manager.h"
+#include "ecs/ecs.h"
 
-#define WINDOW_WIDTH 396
+typedef struct game_t {
-#define WINDOW_HEIGHT 224
-
-typedef struct {
     event_t event;
-    texture_manager_t *texture_manager;
+    texture_manager_t texture_manager;
+    entity_manager_t entity_manager;
+
     bool is_running;
+    clock_t last_clock_state;
+    double delta_time_ms;
 } game_t;
 
-int game_init(game_t*);
+extern game_t game;
 
-int game_handle_event(game_t*);
+void game_init(void);
-int game_update(game_t*);
-int game_render(game_t*);
 
-int game_exit(game_t*);
+void game_handle_event(void);
+
+void game_update(void);
+
+void game_render(void);
+
+void game_exit(void);
 
 #endif // GAME_H

src/main.c

@@ -1,19 +1,32 @@
-//#include "game.h"
+#include <gint/defs/types.h>
-/*
+
+//#include <gint/gdb.h>
+
+#include "game.h"
+
+//#define TEXTURE_TEST
+//#define LINKED_LIST_TEST
+
+game_t game;
+
 int main(void)
 {
-    game_t *game;
+    //gdb_start();
 
-    game_init(game);
+    //__asm__("trapa #42");
 
-    while(game->is_running)
+    game_init();
+
+    while(game.is_running)
     {
-        game_handle_event(game);
+        game_handle_event();
-        game_update(game);
+        game_update();
-        game_render(game);
+        game_render();
     }
 
-    return game_exit(game);
+    game_exit();
+
+    return 0;
 }
 
 

src/vector2d.c

@@ -1,15 +1,28 @@
 #include "vector2d.h"
 
+__attribute__((const)) float fabsf(float x)
+{
+    union {
+        float f;
+        uint32_t i;
+    } u = { x };
+
+    u.i &= 0x7FFFFFFF;
+    return u.f;
+}
+
 bool has_intersection(const rect_t * A, const rect_t * B)
 {
-    int Amin, Amax, Bmin, Bmax;
+    float Amin, Amax, Bmin, Bmax;
 
-    if (!A || !B) {
+    if (!A || !B)
+    {
         return false;
     }
 
     /* Special cases for empty rects */
-    if (rect_empty(A) || rect_empty(B)) {
+    if (rect_empty(A) || rect_empty(B))
+    {
         return false;
     }
 
@@ -42,18 +55,20 @@ bool has_intersection(const rect_t * A, const rect_t * B)
 
 bool intersect_rect(const rect_t * A, const rect_t * B, rect_t * result)
 {
-    int Amin, Amax, Bmin, Bmax;
+    if (!A || !B || !result)
-
+    {
-    if (!A || !B || !result) {
         // TODO error message
         return false;
     }
 
     /* Special cases for empty rects */
-    if (rect_empty(A) || rect_empty(B)) {
+    if (rect_empty(A) || rect_empty(B))
+    {
         return false;
     }
 
+    float Amin, Amax, Bmin, Bmax;
+
     /* Horizontal intersection */
     Amin = A->x;
     Amax = Amin + A->w;

src/vector2d.h

@@ -10,22 +10,67 @@
 
 #include <gint/defs/types.h>
 
-typedef struct {
+/* vector2d_t: A point in space
-    int x, y;
+   This struct is the base for storing 2D positions.
+
+   @x   X pos of the vector
+   @y   Y pos of the vector */
+typedef struct vector2d_t {
+    float x, y;
 } vector2d_t;
 
-typedef struct {
+/* vector2d_t: A point in space
-    int x, y;
+   This struct is the base for storing 2D positions.
-    int w, h;
+
+   @x   X pos of the rectangle
+   @y   Y pos of the rectangle
+   @w   Width of the rectangle
+   @h   Height of the rectangle */
+typedef struct rect_t {
+    float x, y;
+    float w, h;
 } rect_t;
 
+#define EPSILON 0.000001f
+
+__attribute__((const)) float fabsf(float x);
+
+#define is_equal_to_zero(X) (fabsf(X) <= EPSILON)
+
+#define is_not_zero(X) (fabsf(X) > EPSILON)
+
+/* point_in_rect(): Verify if a point is in a rectangle
+   This function is useful for verify if a point is in a rectangle.
+
+   @P   A Vector2d
+   @R   A rectangle
+   Return true if the condition is validated else false. */
 #define point_in_rect(P, R) (((P)->x >= (R)->x) && ((P)->x < ((R)->x + (R)->w)) && \
                              ((P)->y >= (R)->y) && ((P)->y < ((R)->y + (R)->h)))
 
-#define rect_empty(X) ((!(X)) || ((X)->w <= 0) || ((X)->h <= 0))
+/* rect_empty(): Verify if a rectangle is empty
+   This function is useful for verify if a rectangle exists.
 
-bool has_intersection(const rect_t * A, const rect_t * B);
+   @R   A rectangle
+   Return true if the condition is validated else false. */
+#define rect_empty(R) ((!(R)) || (is_equal_to_zero((R)->w)) || (is_equal_to_zero((R)->h)))
 
-bool intersect_rect(const rect_t * A, const rect_t * B, rect_t * result);
+/* has_intersection(): Verify if there is a intersction between two rectangles
+   This function is useful for verify intersection between two rectangles.
+
+   @A   A rectangle
+   @B   Another rectangle
+   Return true if the condition is validated else false. */
+bool has_intersection(const rect_t *, const rect_t *);
+
+/* intersect_rect(): Like has_intersection but has a result rectangle
+   This function is useful for verify intersection between two rectangles
+   and get the intersection rectangle.
+
+   @A       A rectangle
+   @B       Another rectangle
+   @result  The intersection rectangle
+   Return true if the condition is validated else false. */
+bool intersect_rect(const rect_t *, const rect_t *, rect_t *);
 
 #endif // VECTOR2D_H