1 files changed, 44 insertions, 4 deletions

diff --git a/src/map.c b/src/map.c
index 81839b5..33e57bc 100644
--- a/src/map.c
+++ b/src/map.c
@@ -8,7 +8,46 @@ void repositionMap(Map* map)
   map->rect.x = GetRenderWidth() - map->rect.width;
 }
 
-void initMap(Map* map, const Settings* settings)
+void initMapHeightmap(Map* map, const World* world)
+{
+  Image image = LoadImageFromTexture(world->heightmapTexture);
+  Color* colors = LoadImageColors(image);
+  UnloadImage(image);
+
+  for (int index = 0; index < WORLD_IMAGE_WIDTH * WORLD_IMAGE_HEIGHT; ++index)
+  {
+    unsigned char grayValue = GRAY_VALUE(colors[index]);
+    unsigned char alpha = colors[index].a;
+
+    if (grayValue >= 170)
+    {
+      colors[index] = (Color){grayValue, 0, 0, alpha};
+    }
+    else if (grayValue >= 85)
+    {
+      colors[index] = (Color){0, grayValue * 2, grayValue, alpha};
+    }
+    else
+    {
+      colors[index] = (Color){grayValue, 0, grayValue, alpha};
+    }
+  }
+
+  image = (Image){
+    .data = colors,
+    .width = WORLD_IMAGE_WIDTH,
+    .height = WORLD_IMAGE_HEIGHT,
+    .format = PIXELFORMAT_UNCOMPRESSED_R8G8B8A8,
+    .mipmaps = 1
+  };
+
+  ImageColorContrast(&image, 25.0);
+  
+  map->heightmap = LoadTextureFromImage(image);
+  UnloadImage(image);
+}
+
+void initMap(Map* map, const World* world, const Settings* settings)
 {
   *map = (Map){
     .rect = (Rectangle){0.0, 0.0, settings->mapPreviewWidth,
@@ -27,6 +66,7 @@ void initMap(Map* map, const Settings* settings)
     .isFullSize = false
   };
 
+  initMapHeightmap(map, world);
   repositionMap(map);
 }
 
@@ -83,9 +123,8 @@ void updateMapPreview(Map* map, Game* game)
   ClearBackground(BLANK);
 
   // Draw height map.
-  Color color = GREEN;
-  color.a = settings->mapAlpha;
-  DrawTexture(game->world.heightmapTexture, 0.0, 0.0, color);
+  DrawTexture(map->heightmap, 0.0, 0.0,
+              (Color){255, 255, 255, settings->mapAlpha});
 
   EndMode2D();
   EndTextureMode();
@@ -134,4 +173,5 @@ void updateMap(Map* map, Game* game)
 void closeMap(Map* map)
 {
   UnloadRenderTexture(map->render);
+  UnloadTexture(map->heightmap);
 }