Very basic animations

game/components.h

@@ -30,6 +30,20 @@ typedef struct TextureRegion {
     Rectangle rec;
 } TextureRegion;
 
+typedef enum AnimationType {
+    ANIMATION_IDLE,
+    ANIMATION_WALK,
+} AnimationType;
+
+typedef struct Animation {
+    TextureRegion firstFrame;
+    AnimationType currAnimation;
+    i32 currFrame;
+    i32 frameCount;
+    f32 frameDuration;
+    f32 elapsed;
+} Animation;
+
 
 
 #endif //PIXELDEFENSE_COMPONENTS_H

game/main.c

@@ -1,5 +1,6 @@
 #include <rlImGui.h>
 
+#include "systems/systems.h"
 #include "utils/building_types.h"
 #include "components.h"
 #include "game_state.h"
@@ -82,6 +83,8 @@ bool init(Game *game) {
     bzTileMapOverrideObjectGroup(&game->map, OBJECTS_GAME, initGameObjectsLayer);
     bzTileMapOverrideObjectGroup(&game->map, OBJECTS_ENTITIES, initEntityObjectsLayer);
 
+    ECS_SYSTEM(ECS, updateAnimations, EcsOnUpdate, Animation, TextureRegion);
+    ECS_SYSTEM(ECS, renderEntities, EcsOnUpdate, Position, Size, Rotation, TextureRegion);
 
     return true;
 }
@@ -146,6 +149,8 @@ void render(float dt, Game *game) {
     bzTileMapDraw(&game->map);
     bzTileMapDrawColliders(&game->map);
 
+    ecs_progress(ECS, dt);
+
     EndMode2D();
 }
 

game/map_init.c

@@ -22,6 +22,7 @@ bool initEntityObjectsLayer(BzTileMap *map, BzTileObjectGroup *objectGroup) {
     ECS_COMPONENT(ECS, Size);
     ECS_COMPONENT(ECS, Rotation);
     ECS_COMPONENT(ECS, TextureRegion);
+    ECS_COMPONENT(ECS, Animation);
 
     BzTileset *objectTileset = bzTileObjectGroupGetTileset(&GAME->map, objectGroup);
     if (!objectTileset) return true;
@@ -33,6 +34,16 @@ bool initEntityObjectsLayer(BzTileMap *map, BzTileObjectGroup *objectGroup) {
         ecs_set(ECS, e, Size, {object.shape.sizeX, object.shape.sizeY});
         ecs_set(ECS, e, Rotation, {0.0f});
         ecs_set(ECS, e, TextureRegion, {objectTileset->tiles, bzTilesetGetTileRegion(objectTileset, object.gid)});
+        ecs_set(ECS, e, Animation, {
+            .firstFrame=(TextureRegion) {
+                    objectTileset->tiles,
+                    bzTilesetGetTileRegion(objectTileset, object.gid)
+            },
+            .currAnimation=ANIMATION_IDLE,
+            .currFrame=0,
+            .frameCount=2,
+            .frameDuration=0.36f
+        });
     }
     return true;
 

game/systems/animations.c

@@ -0,0 +1,17 @@
+#include "systems.h"
+
+void updateAnimations(ecs_iter_t *it) {
+    Animation *anim = ecs_field(it, Animation, 1);
+    TextureRegion *t = ecs_field(it, TextureRegion, 2);
+
+    float dt = GetFrameTime();
+
+    for (i32 i = 0; i < it->count; i++) {
+        anim[i].elapsed += dt;
+        if (anim[i].elapsed < anim[i].frameDuration) continue;
+
+        anim[i].currFrame = (anim[i].currFrame + 1) % anim[i].frameCount;
+        anim[i].elapsed = 0.0f;
+        t[i].rec.x = anim[i].firstFrame.rec.x + anim[i].currFrame * t[i].rec.width;
+    }
+}

game/systems/systems.h

@@ -6,5 +6,6 @@
 #include "../components.h"
 
 void renderEntities(ecs_iter_t *it);
+void updateAnimations(ecs_iter_t *it);
 
 #endif //PIXELDEFENSE_SYSTEMS_H