Add building preview

game/game_state.h

@@ -6,6 +6,14 @@
 
 #include "entity_map.h"
 
+typedef enum InputState {
+    INPUT_NONE,
+    INPUT_PLACING,
+    INPUT_DRAGGING,
+    INPUT_SELECTED_UNITS,
+    INPUT_SELECTED_OBJECT,
+} InputState;
+
 typedef struct Game {
     Camera2D camera;
     BzTileset terrainTileset;
@@ -14,10 +22,13 @@ typedef struct Game {
     BzTileMap map;
     EntityMap entityMap;
     f32 frameDuration;
-    Vector2 targetPos;
     ecs_entity_t entity;
     struct {
+        InputState state;
         int building;
+        bool buildingCanPlace;
+        TilePosition buildingPos;
+        TileSize buildingSize;
         Vector2 mouseDown;
         f32 mouseDownElapsed;
     } input;

game/main.c

@@ -161,25 +161,34 @@ void update(float dt, void *userData) {
     int tileX = (int) worldPos.x / map->tileWidth;
     int tileY = (int) worldPos.y / map->tileHeight;
 
-    if (IsKeyPressed(KEY_ESCAPE) || IsMouseButtonPressed(MOUSE_BUTTON_RIGHT))
+    if (IsKeyPressed(KEY_ESCAPE) || IsMouseButtonPressed(MOUSE_BUTTON_RIGHT)) {
+        game->input.state = INPUT_NONE;
+    }
+    if (game->input.state == INPUT_NONE) {
         game->input.building = 0;
-    if (game->input.building) {
+    }
+
+    switch (game->input.state) {
+        case INPUT_NONE:
+            break;
+        case INPUT_PLACING:
+            BZ_ASSERT(game->input.building);
             BzTile sizeX = 0, sizeY = 0;
             getBuildingSize(game->input.building, &sizeX, &sizeY);
-
             bool canPlace = canPlaceBuilding(&game->map, game->input.building, tileX, tileY);
-        /*
-        Color placeColor = canPlace ?
-                           (Color) {0, 255, 0, 200} :
-                           (Color) {255, 0, 0, 200};
-
-        DrawRectangleLines(tileX * 16, tileY * 16, sizeX * 16, sizeY * 16, placeColor);
-         */
-
             if (canPlace && IsMouseButtonDown(MOUSE_BUTTON_LEFT)) {
                 placeBuilding(&game->map, game->input.building, tileX, tileY);
             }
-        return;
+            game->input.buildingCanPlace = canPlace;
+            game->input.buildingPos = (TilePosition) {tileX, tileY};
+            game->input.buildingSize = (TileSize) {sizeX, sizeY};
+            break;
+        case INPUT_DRAGGING:
+            break;
+        case INPUT_SELECTED_UNITS:
+            break;
+        case INPUT_SELECTED_OBJECT:
+            break;
     }
 
     if (IsMouseButtonPressed(MOUSE_BUTTON_LEFT)) {
@@ -204,6 +213,19 @@ void render(float dt, void *userData) {
     bzTileMapDraw(&game->map);
     bzTileMapDrawColliders(&game->map);
 
+    if (game->input.building) {
+        Color placeColor = game->input.buildingCanPlace ?
+                           (Color) {0, 255, 0, 200} :
+                           (Color) {255, 0, 0, 200};
+
+        BzTile width = game->map.tileWidth;
+        BzTile height = game->map.tileHeight;
+        DrawRectangleLines(game->input.buildingPos.x * width,
+                           game->input.buildingPos.y * height,
+                           game->input.buildingSize.sizeX * width,
+                           game->input.buildingSize.sizeY * height, placeColor);
+    }
+
 
     Vector2 worldPos = GetScreenToWorld2D(GetMousePosition(), game->camera);
     int tileX = (int) worldPos.x / 16;
@@ -243,6 +265,9 @@ void imguiRender(float dt, void *userData) {
 
     igSetNextWindowSize((ImVec2){300, 400}, ImGuiCond_FirstUseEver);
     igBegin("Debug Menu", NULL, 0);
+    if (igCollapsingHeader_TreeNodeFlags("Selection", 0)) {
+
+    }
     if (igCollapsingHeader_TreeNodeFlags("Resources", 0)) {
         igText("Wood:       %lld", game->resources.wood);
         igText("Iron:       %lld", game->resources.iron);
@@ -255,6 +280,8 @@ void imguiRender(float dt, void *userData) {
             if (igSelectable_Bool(getBuildingStr(i), game->input.building == i, 0, (ImVec2){0, 0}))
                 game->input.building = i;
         }
+        if (game->input.building)
+            game->input.state = INPUT_PLACING;
 
     }
     if (igCollapsingHeader_TreeNodeFlags("Entities", 0)) {