Add origin point to sprites, WASD controls camera, debug draw rects, todo list

game_data.h

@@ -9,6 +9,7 @@
 #define ANIM_KNIGHT_ATTACK_BACK1 6
 #define ANIM_KNIGHT_ATTACK_BACK2 7
 
+const u16 cell_size = 192;
 SpriteSheet knight = {
     .name = "blue_knight",
     .texture = {0},
@@ -16,61 +17,62 @@ SpriteSheet knight = {
     .size = { 1152, 1536 },
 };
 
-const u16 cell_size = 192;
+const Vector2 knight_origin = {cell_size / 2, cell_size / 2};
+
 SpriteAnimation knight_idle = {
     .name = "idle",
     .total_frames = 6,
     .loop = true,
-    .src_rect = { 0, cell_size * 0, 192, 192 },
+    .src_rect = { 0, cell_size * 0, cell_size, cell_size },
 };
 
 SpriteAnimation knight_run = {
     .name = "run",
     .total_frames = 6,
     .loop = true,
-    .src_rect = { 0, cell_size * 1, 192, 192 },
+    .src_rect = { 0, cell_size * 1, cell_size, cell_size },
 };
 
 SpriteAnimation knight_attack_side1 = {
     .name = "attack_side1",
     .total_frames = 6,
     .loop = false,
-    .src_rect = { 0, cell_size * 2, 192, 192 },
+    .src_rect = { 0, cell_size * 2, cell_size, cell_size },
 };
 
 SpriteAnimation knight_attack_side2 = {
     .name = "attack_side2",
     .total_frames = 6,
     .loop = false,
-    .src_rect = { 0, cell_size * 3, 192, 192 },
+    .src_rect = { 0, cell_size * 3, cell_size, cell_size },
 };
 
 SpriteAnimation knight_attack_front1 = {
     .name = "attack_front1",
     .total_frames = 6,
     .loop = false,
-    .src_rect = { 0, cell_size * 4, 192, 192 },
+    .src_rect = { 0, cell_size * 4, cell_size, cell_size },
 };
 
 SpriteAnimation knight_attack_front2 = {
     .name = "attack_front2",
     .total_frames = 6,
     .loop = false,
-    .src_rect = { 0, cell_size * 5, 192, 192 },
+    .src_rect = { 0, cell_size * 5, cell_size, cell_size },
 };
 
 SpriteAnimation knight_attack_back1 = {
     .name = "attack_back1",
     .total_frames = 6,
     .loop = false,
-    .src_rect = { 0, cell_size * 6, 192, 192 },
+    .src_rect = { 0, cell_size * 6, cell_size, cell_size },
 };
 
 SpriteAnimation knight_attack_back2 = {
     .name = "attack_back2",
     .total_frames = 6,
     .loop = false,
-    .src_rect = { 0, cell_size * 7, 192, 192 },
+    .src_rect = { 0, cell_size * 7, cell_size, cell_size },
 };
 
 SpriteAnimation knight_anims[8];

lib.h

@@ -18,7 +18,7 @@ typedef char      byte;
 typedef ptrdiff_t size;
 typedef size_t    usize;
 
-typedef Vector2 Position;
+typedef Vector2 Point;
 
 typedef struct Size {
     float width;
@@ -26,7 +26,7 @@ typedef struct Size {
 } Size;
 
 typedef struct Rect {
-    Position position;
+    Point position;
     Size size;
 } Rect;
 

main.c

@@ -9,9 +9,10 @@
 #define MAX_ANIMATION_PLAYBACKS 64
 
 #include "sprites.h"
-#include "lib.h"
 #include "game_data.h"
 
+#define DEBUG_MODE_ENABLED
+
 typedef enum KnightState {
     KNIGHT_IDLE = 0,
     KNIGHT_RUNNING = 1,
@@ -30,7 +31,8 @@ typedef enum Direction {
 } Direction;
 
 typedef struct {
-    Vector2 position;
+    Point position;
+    Point origin;
     Vector2 velocity;
     Direction look_dir;
     KnightState state;
@@ -39,9 +41,11 @@ typedef struct {
 typedef struct {
     int frame_count;
     Knight knight;
-    Rectangle *sprite_rects;
+    // Rectangle* sprite_rects;
+    Point camera_position;
     SpriteAnimationPlayback* anim_playbacks;
     int anim_playbacks_count;
+    bool debug_mode;
 } GameState;
 
 typedef struct {
@@ -66,30 +70,49 @@ Assets Init() {
     return assets;
 }
 
-void Update(GameState *game, Camera2D cam, float dt) {
+void Update(GameState *game, Camera2D *cam, float dt) {
-    (void)cam;
 
     TickSpriteAnimations(&knight_anims[0], game->anim_playbacks, 1);
 
-    float movement_speed = 250.0f * dt;
+    const float movement_speed = 250.0f * dt;
     Vector2 input_vel = {0};
-    if (IsKeyDown(KEY_RIGHT) || IsKeyDown(KEY_D)) {
+    if (IsKeyDown(KEY_RIGHT)) {
         input_vel.x = 1;
     }
-    if (IsKeyDown(KEY_LEFT) || IsKeyDown(KEY_A)) {
+    if (IsKeyDown(KEY_LEFT)) {
         input_vel.x = -1;
     }
-    if (IsKeyDown(KEY_UP) || IsKeyDown(KEY_W)) {
+    if (IsKeyDown(KEY_UP)) {
         input_vel.y = -1;
     }
-    if (IsKeyDown(KEY_DOWN) || IsKeyDown(KEY_S)) {
+    if (IsKeyDown(KEY_DOWN)) {
         input_vel.y = 1;
     }
+    const float cam_move_speed = 1050.0f * dt;
+    Vector2 cam_vel = {0};
+    if (IsKeyDown(KEY_D)) {
+        cam_vel.x = -1;
+    }
+    if (IsKeyDown(KEY_A)) {
+        cam_vel.x = 1;
+    }
+    if (IsKeyDown(KEY_W)) {
+        cam_vel.y = 1;
+    }
+    if (IsKeyDown(KEY_S)) {
+        cam_vel.y = -1;
+    }
+    cam_vel = Vector2Normalize(cam_vel);
+    game->camera_position = Vector2Scale(cam_vel, cam_move_speed);
+    cam->offset = Vector2Add(cam->offset, game->camera_position);
     if (IsKeyPressed(KEY_SPACE) && game->knight.state != KNIGHT_ATTACKING) {
         game->knight.state = KNIGHT_ATTACKING;
         game->anim_playbacks[0].anim_id = ANIM_KNIGHT_ATTACK_SIDE1;
         PlayAnimation(&game->anim_playbacks[0], game->anim_playbacks[0]);
     }
+    if (IsKeyPressed(KEY_F1)) {
+        game->debug_mode = !game->debug_mode;
+    }
     if (game->knight.state == KNIGHT_ATTACKING) {
         game->anim_playbacks[0].anim_id = ANIM_KNIGHT_ATTACK_SIDE1;
         if (game->anim_playbacks[0].is_finished) {
@@ -112,7 +135,7 @@ void Update(GameState *game, Camera2D cam, float dt) {
     }
 }
 
-void Draw(GameState *game, Assets assets, Camera2D cam, float dt) {
+void Draw(const GameState *game, Assets assets, Camera2D cam, float dt) {
     (void)cam;
     (void)dt;
     ClearBackground((Color){100, 149, 237, 255});
@@ -137,6 +160,17 @@ void Draw(GameState *game, Assets assets, Camera2D cam, float dt) {
             Vector2 pos = {32 * col + topx, 32 * row + topy};
             Rectangle src_rect = {32 * atlas_col, 32 * atlas_row, 32, 32};
             DrawTextureRec(assets.textures[0], src_rect, pos, WHITE);
+#ifdef DEBUG_MODE_ENABLED
+            if (game->debug_mode) {
+                Rectangle debug_frame = {
+                    pos.x,
+                    pos.y,
+                    src_rect.width,
+                    src_rect.height,
+                };
+                DrawRectangleLinesEx(debug_frame, 0.5f, RED);
+            }
+#endif
         }
     }
     for (int i = 0; i < game->anim_playbacks_count; i++) {
@@ -148,7 +182,19 @@ void Draw(GameState *game, Assets assets, Camera2D cam, float dt) {
         if (game->knight.look_dir == DIR_LEFT) {
             src_rect.width = -abs((int)src_rect.width);
         }
-        DrawTextureRec(assets.textures[1], src_rect, game->knight.position, WHITE);
+        Vector2 pos = Vector2Subtract(game->knight.position, knight_origin);
+        DrawTextureRec(assets.textures[1], src_rect, pos, WHITE);
+#ifdef DEBUG_MODE_ENABLED
+        if (game->debug_mode) {
+            Rectangle debug_frame = {
+                pos.x,
+                pos.y,
+                anim->src_rect.width,
+                anim->src_rect.height,
+            };
+            DrawRectangleLinesEx(debug_frame, 2.0f, RED);
+        }
+#endif
     }
 }
 
@@ -176,7 +222,6 @@ int main(void) {
     // First one is idle
     game.anim_playbacks[0] = (SpriteAnimationPlayback){0};
     game.knight = (Knight){0};
-    // state.anim_playbacks[0].pos = (Position){ knight_idle.src_rect.x, knight_idle.src_rect.y };
 
     Assets assets = Init();
 
@@ -186,7 +231,7 @@ int main(void) {
         game.frame_count++;
         float dt = GetFrameTime();
 
-        Update(&game, cam, dt);
+        Update(&game, &cam, dt);
 
         BeginDrawing();
         {

tinyswords.todo

@@ -0,0 +1,21 @@
+#-*- mode: org -*-
+#+TODO: TODO(t) INPROGRESS(i) BUG(b) | DONE(d)
+#+STARTUP: show2levels
+
+* DONE Import assets and draw a sprite to the world
+* DONE Layout a basic map with tiles
+* DONE Extract Init/Update/Draw to own functions with state in a struct
+* DONE Knight idle animation
+* DONE Configure Makefile to handle deps and updates
+* DONE Knight state to handle attacking
+* DONE Animation flipping
+* DONE Debug mode to show sprite boundaries
+* DONE Sprite position needs to be set to the center
+* DONE Movement keys to move the camera
+* TODO Left click on knight to select, right click to move
+* TODO Handle multiple knights on the map at the same time
+* TODO Ability to attack an entity, like a dummy
+* TODO State to handle attacking when you right click a target
+* TODO Select multiple units and make them all move
+* TODO Flocking/Steering behaviors so many knights move in formation
+* TODO Steering behavior so knights surround a target with spacing