hip.graphics.g2d.tilemap source code

1 /*
2 Copyright: Marcelo S. N. Mancini (Hipreme|MrcSnm), 2018 - 2021
3 License:   [https://creativecommons.org/licenses/by/4.0/|CC BY-4.0 License].
4 Authors: Marcelo S. N. Mancini
5 
6 	Copyright Marcelo S. N. Mancini 2018 - 2021.
7 Distributed under the CC BY-4.0 License.
8    (See accompanying file LICENSE.txt or copy at
9 	https://creativecommons.org/licenses/by/4.0/
10 */
11 
12 module hip.graphics.g2d.tilemap;
13 public import hip.graphics.g2d.spritebatch;
14 public import hip.assets.texture;
15 public import hip.api.data.tilemap;
16 
17 void render(HipTileLayer layer, IHipTilemap map, HipSpriteBatch batch, bool shouldRenderBatch = false)
18 {
19     if(layer.width == 0 || layer.height == 0)
20         return;
21     uint w = layer.width, h = layer.height;
22 
23     uint th = cast(uint)(map.tileHeight*map.scaleY),
24          tw = cast(uint)(map.tileWidth*map.scaleX);
25 
26     ushort lastId;
27     IHipTextureRegion lastTexture;
28 
29 
30 
31     for(int i = 0, y = layer.y; i < h; i++, y+= th)
32         for(int j =0, x = layer.x; j < w; j++, x+= tw)
33         {
34             ushort targetTile = layer.tiles[i*w+j];
35             if(targetTile == 0)
36                 continue;
37             if(lastId != targetTile)
38             {
39                 /**
40                 * Probably worth caching as it is: 
41                 * - one pointer dereference (map->)
42                 * - one function call (getTextureRegionForID)
43                 * - one function call (getTilesetForID)
44                 * - one pointer derefenrece (tileset->)
45                 * - one function call (getTextureRegion)
46                 */
47                 lastId = targetTile;
48                 lastTexture = map.getTextureRegionForID(targetTile);
49             }
50             batch.draw(lastTexture, map.x + x,  map.y + y, 0, map.color, map.scaleX, map.scaleY, map.rotation);
51         }
52 
53     if(shouldRenderBatch)
54         batch.draw();
55 }
56 
57 void render(IHipTilemap map, HipSpriteBatch batch, bool shouldRenderBatch)
58 {
59     foreach(l; map.layers)
60     {
61         render(l, map, batch, false);
62     }
63     if(shouldRenderBatch)
64         batch.draw();
65 }