5 files changed, 51 insertions, 7 deletions
diff --git a/src/game.c b/src/game.c
index 5f7565f..9d7686f 100644
--- a/src/game.c
+++ b/src/game.c
@@ -83,7 +83,7 @@ void initGame(Game* game)
   game->player.position = Vector3Scale(game->world.size, 0.5);
 
   // Map.
-  initMap(&game->map, &game->settings);
+  initMap(&game->map, &game->world, &game->settings);
 
   disableGameCursor(game);
 }
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);
 }
diff --git a/src/map.h b/src/map.h
index 9a1d41e..4a71504 100644
--- a/src/map.h
+++ b/src/map.h
@@ -14,9 +14,11 @@ typedef struct {
   Vector2 playerPosition;
   bool isEnabled;
   bool isFullSize;
+
+  Texture heightmap;
 } Map;
 
-void initMap(Map* map, const Settings* settings);
+void initMap(Map* map, const World* world, const Settings* settings);
 void updateMap(Map* map, Game* game);
 void closeMap(Map* map);
 
diff --git a/src/settings.c b/src/settings.c
index 4ca38c4..3dd1fa5 100644
--- a/src/settings.c
+++ b/src/settings.c
@@ -21,7 +21,7 @@ Settings defaultSettings()
     .isMapPreviewEnabledDefault = true,
     .mapPreviewWidth = 300.0,
     .mapPreviewHeight = 300.0,
-    .mapAlpha = (unsigned char)255.0 * 0.85,
+    .mapAlpha = (unsigned char)255.0 * 0.80,
     .mapPreviewZoomDefault = 10.0,
     .mouseSpeed = 0.1,
     .forwardKey = KEY_W,
diff --git a/src/utils.h b/src/utils.h
index 75e27fd..fddfa9d 100644
--- a/src/utils.h
+++ b/src/utils.h
@@ -54,6 +54,8 @@
 #define PRINT_VECTOR2(v) printf("%f %f\n", v.x, v.y)
 #define PRINT_VECTOR3(v) printf("%f %f %f\n", v.x, v.y, v.z)
 
+#define GRAY_VALUE(color) ((float)(color.r + color.g + color.b) / 3.0)
+
 #define RANDOM_DIRECTION_UNITS 4096
 
 // Typedef hackery.