add basic animation

src/main.cpp

@@ -188,6 +188,7 @@ static Uint16 indices[] = {
 
 struct Instance {
     vec2 pos;
+    uint32_t sprite_selection;
 };
 
 static Instance player_instance = {{ 0.0f, 0.0f }};
@@ -205,16 +206,6 @@ struct Map {
 
 static Map current_map;
 
-struct Player {
-    i32vec2 position;
-    i32vec2 target_position;
-
-    bool is_moving;
-    vec2 visual_position;
-};
-
-static Player player;
-
 struct alignas(16) PerFrame {
     i32vec2 drag_start;
     i32vec2 mouse;
@@ -233,6 +224,19 @@ typedef enum : Uint8 {
     DIR_RIGHT,
 } Direction;
 
+struct Player {
+    i32vec2 position;
+    i32vec2 target_position;
+
+    Direction direction;
+
+    bool is_moving;
+    vec2 visual_position;
+    Uint64 animation_time;
+};
+
+static Player player;
+
 typedef enum : Uint8 {
     TILEKIND_ERROR = 0,
     TILEKIND_NONE  = 1,
@@ -905,7 +909,7 @@ static bool init_resources() {
         return false;
     }
 
-    player_texture = create_texture("decorations/strawberry.png");
+    player_texture = create_texture("characters/Basic Charakter Spritesheet.png");
     if (!player_texture) {
         log_error("Failed to create shader texture.");
         return false;
@@ -1434,6 +1438,8 @@ static void update_state_game() {
     const bool *keyboard_state = SDL_GetKeyboardState(NULL);
 
     if (player.is_moving) {
+        player.animation_time += delta_time;
+
         vec2 leftover_movement = vec2(player.target_position) - player.visual_position;
         vec2 movement = clamp(min(vec2(0, 0), leftover_movement), normalize(leftover_movement) * (delta_t * character_speed * (keyboard_state[SDL_SCANCODE_LSHIFT] ? 2.0f : 1.0f)), max(vec2(0, 0), leftover_movement));
         player.visual_position += movement;
@@ -1446,14 +1452,17 @@ static void update_state_game() {
 
     if (!player.is_moving && (queued_movement || keyboard_state[SDL_SCANCODE_W] || keyboard_state[SDL_SCANCODE_A] || keyboard_state[SDL_SCANCODE_S] || keyboard_state[SDL_SCANCODE_D])) {
         switch (queued_movement_direction) {
-            case DIR_UP:    { player.target_position = clamp(ivec2(0, 0), player.position + ivec2( 0,  1), current_map.size - ivec2(2, 2)); if (player.target_position != player.position) player.is_moving = true; } break;
-            case DIR_LEFT:  { player.target_position = clamp(ivec2(0, 0), player.position + ivec2(-1,  0), current_map.size - ivec2(2, 2)); if (player.target_position != player.position) player.is_moving = true; } break;
-            case DIR_DOWN:  { player.target_position = clamp(ivec2(0, 0), player.position + ivec2( 0, -1), current_map.size - ivec2(2, 2)); if (player.target_position != player.position) player.is_moving = true; } break;
-            case DIR_RIGHT: { player.target_position = clamp(ivec2(0, 0), player.position + ivec2( 1,  0), current_map.size - ivec2(2, 2)); if (player.target_position != player.position) player.is_moving = true; } break;
+            case DIR_UP:    { player.direction = queued_movement_direction; player.target_position = clamp(ivec2(0, 0), player.position + ivec2( 0,  1), current_map.size - ivec2(2, 2)); if (player.target_position != player.position) player.is_moving = true; } break;
+            case DIR_LEFT:  { player.direction = queued_movement_direction; player.target_position = clamp(ivec2(0, 0), player.position + ivec2(-1,  0), current_map.size - ivec2(2, 2)); if (player.target_position != player.position) player.is_moving = true; } break;
+            case DIR_DOWN:  { player.direction = queued_movement_direction; player.target_position = clamp(ivec2(0, 0), player.position + ivec2( 0, -1), current_map.size - ivec2(2, 2)); if (player.target_position != player.position) player.is_moving = true; } break;
+            case DIR_RIGHT: { player.direction = queued_movement_direction; player.target_position = clamp(ivec2(0, 0), player.position + ivec2( 1,  0), current_map.size - ivec2(2, 2)); if (player.target_position != player.position) player.is_moving = true; } break;
         }
     }
     queued_movement = false;
 
+    if (!player.is_moving)
+        player.animation_time = 0;
+
     if (!MIX_TrackPlaying(music_track)) {
         MIX_SetTrackAudio(music_track, music_setting_off_piano);
         MIX_PlayTrack(music_track, 0);
@@ -1467,7 +1476,11 @@ static void render_game() {
         ZoneScopedN("update buffers");
         {
             ZoneScopedN("player_instance_buffer");
-            player_instance.pos = player.visual_position;
+
+            Uint64 variation_index = (player.animation_time / (100 * SDL_NS_PER_MS)) % 4;
+
+            player_instance.pos              = player.visual_position;
+            player_instance.sprite_selection = variation_index << 16 | player.direction;
 
             renderer_buffer_update(player_instance_buffer, 0, sizeof(player_instance), &player_instance);
         }