Fullscreen scrolling, initial cut at game logic

testbed.c

@@ -469,7 +469,7 @@ int tifLoad(FILE *f, TifImageMeta_t meta, unsigned int *planeBuf, int maxY, int
 // 89ABCDEF 01234567 << 3 => BCDEFXXX 3456789A byteswap => 3456789A BCDEFXXX
 
 #define PAGE_TILES_W 21
-#define PAGE_TILES_H 12
+#define PAGE_TILES_H 14
 #define PAGE_TILES_COUNT (PAGE_TILES_H * PAGE_TILES_W)
 #define PAGE_STRIDE (PAGE_TILES_W << 1)
 
@@ -511,7 +511,7 @@ typedef struct {
   unsigned char firstBuffer;
 } TiledScreen_t;
 
-TiledScreen_t screen = { 0, 0, 0, 0, { 0x0400, 0x2400 }, 0, 0, NULL, NULL,
+TiledScreen_t screen = { 0, 0, 0, 0, { 0x0600, 0x2B00 }, 0, 0, NULL, NULL,
   0, 0, 0, 0, 0 };
 
 void loadTiles(unsigned int tilesOffset, unsigned int *memTiles) {
@@ -598,7 +598,7 @@ void drawSprite(unsigned int *sprite, int x, int y) {
 
 void scroll(int newX, int newY) {
   newX = min(max(newX, 0), (screen.w << 4) - 320);
-  newY = min(max(newY, 0), (screen.h << 4) - 176);
+  newY = min(max(newY, 0), (screen.h << 4) - 200);
   if ((screen.scrollX & 0xfff0) != (newX & 0xfff0) ||
       (screen.scrollY & 0xfff0) != (newY & 0xfff0)) {
     int mapX, mapY;
@@ -675,7 +675,7 @@ void drawScreen() {
 /*** S C R A T C H ***/
 #define NUM_TILES 128
 #define NUM_SPRITES 64
-#define OFF_TILES 0x4840
+#define OFF_TILES 0x5000
 #define TILE_STRIDE 64
 #define SPRITE_STRIDE 80
 unsigned int tiles[NUM_TILES * TILE_STRIDE];
@@ -695,10 +695,64 @@ void fillMap() {
   }
 }
 
+#define DIR_N 0
+#define DIR_E 1
+#define DIR_W 2
+#define DIR_S 3
+
+#define STATE_MAP 0
+#define STATE_DIALOG 1
+
+struct entity;
+typedef struct entity Entity_t;
+
+struct entity {
+  int x;
+  int y;
+  int dir;
+  int sprites[4];
+};
+
+void drawEntity(Entity_t *entity) {
+  int isprite = entity->sprites[entity->dir];
+  drawSprite(&sprites[isprite * SPRITE_STRIDE], entity->x, entity->y);
+}
+
+void playerThink(Entity_t *self) {
+  if (keyPressed(K_LEFT))  { self->x -= 3; self->dir = DIR_W; }
+  if (keyPressed(K_RIGHT)) { self->x += 3; self->dir = DIR_E; }
+  if (keyPressed(K_UP))    { self->y -= 3; self->dir = DIR_N; }
+  if (keyPressed(K_DOWN))  { self->y += 3; self->dir = DIR_S; }
+}
+
+typedef struct {
+  int dy;
+  int y;
+  int debounce;
+} Footer_t;
+
+typedef struct {
+  Entity_t player;
+  Footer_t footer;
+  int state;
+} Game_t;
+
+Game_t game;
+
 void game_init() {
   FILE *f;
   TifImageMeta_t meta;
 
+  game.player.x = 100;
+  game.player.y = 100;
+  game.player.dir = DIR_E;
+  game.player.sprites[DIR_E] = 0;
+  game.player.sprites[DIR_N] = 1;
+  game.player.sprites[DIR_W] = 2;
+  game.player.sprites[DIR_S] = 3;
+  game.footer.y = 0;
+  game.state = STATE_MAP;
+
   setEGAMode();
   atexit(vid_cleanup);
 
@@ -721,7 +775,7 @@ void game_init() {
   tifLoad(f, meta, sprites, NUM_SPRITES * 16, 16, 5);
   fclose(f);
 
-  setSplitScreen(351);
+//  setSplitScreen(351);
 
   loadTiles(OFF_TILES, tiles);
   loadMap(map, 100, 100);
@@ -729,21 +783,37 @@ void game_init() {
 }
 
 int main() {
-  int x = -1;
-  int y = -1;
-  int dir = 0;
-
   game_init();
   kbd_init();
 
   while (!keyPressed(K_ESC)) {
-
-    if (keyPressed(K_LEFT))  { x -= 3; dir = 2; }
-    if (keyPressed(K_RIGHT)) { x += 3; dir = 0; }
-    if (keyPressed(K_UP))    { y -= 3; dir = 1; }
-    if (keyPressed(K_DOWN))  { y += 3; dir = 3; }
-    scroll(x - 152, y - 90);
-    drawSprite(&sprites[dir * SPRITE_STRIDE], x, y);
+    if (game.state == STATE_MAP) {
+      if (keyPressed(K_SPACE)) {
+	game.state = STATE_DIALOG;
+	game.footer.debounce = 1;
+	game.footer.dy = 1;
+      }
+      playerThink(&game.player);
+      scroll(game.player.x - 152, game.player.y - 92);
+    } else if (game.state == STATE_DIALOG) {
+      if (game.footer.debounce && !keyPressed(K_SPACE)) {
+	game.footer.debounce = 0;
+      }
+      if (!game.footer.debounce && keyPressed(K_SPACE)) {
+	game.footer.dy = -1;
+      }
+      game.footer.y += game.footer.dy;
+      if (game.footer.dy > 0 && game.footer.y > 24) {
+	game.footer.y = 24;
+	game.footer.dy = 0;
+      } else if (game.footer.dy < 0 && game.footer.y < 0) {
+	game.footer.y = 0;
+	game.footer.dy = 0;
+	game.state = STATE_MAP;
+      }
+      setSplitScreen(399 - (game.footer.y << 1));
+    }
+    drawEntity(&game.player);
     drawScreen();
   }