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Viewport map: Improve handling of sloped tile rendering

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This commit is contained in:
Jonathan G Rennison
2021-06-17 17:27:03 +01:00
parent c4cb700738
commit 24ad8759db
1 changed files with 13 additions and 8 deletions
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21
src/viewport.cpp
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@@ -2912,16 +2912,21 @@ uint32 ViewportMapGetColour(const Viewport * const vp, uint x, uint y, const uin
/* Very approximative but fast way to get the tile when taking Z into account. */
const TileIndex tile_tmp = TileVirtXY(x, y);
const uint z = TileHeight(tile_tmp) * 4;
if (x + z >= MapSizeX() << 4) {
/* Wrapping of tile X coordinate causes a graphic glitch below south west border. */
return 0;
}
TileIndex tile = TileVirtXY(x + z, y + z);
if (tile >= MapSize()) return 0;
if (_settings_game.construction.freeform_edges) {
/* tile_tmp and tile must be from the same side,
* otherwise it's an approximation erroneous case
* that leads to a graphic glitch below south west border.
*/
if (TileX(tile_tmp) > (MapSizeX() - (MapSizeX() / 8)))
if ((TileX(tile_tmp) < (MapSizeX() / 2)) != (TileX(tile) < (MapSizeX() / 2)))
return 0;
const uint z2 = TileHeight(tile) * 4;
if (unlikely(z2 != z)) {
const uint approx_z = (z + z2) / 2;
if (x + approx_z >= MapSizeX() << 4) {
/* Wrapping of tile X coordinate causes a graphic glitch below south west border. */
return 0;
}
tile = TileVirtXY(x + approx_z, y + approx_z);
if (tile >= MapSize()) return 0;
}
TileType tile_type = MP_VOID;
tile = ViewportMapGetMostSignificantTileType(vp, tile, &tile_type);