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1 files changed, 20 insertions, 23 deletions

diff --git a/src/camera-offset.cpp b/src/camera-offset.cpp
index de6f584d..ab547387 100644
--- a/src/camera-offset.cpp
+++ b/src/camera-offset.cpp
@@ -12,29 +12,26 @@ with_shifted_camera_offset::with_shifted_camera_offset(tile_shader& shader, chun
 
     constexpr auto chunk_size = TILE_MAX_DIM20d*dTILE_SIZE;
     auto offset = _camera + tile_shader::project(Vector3d(c_.x, c_.y, 0) * chunk_size);
-    auto pos  = Vector2d(chunk_coords(c_) - first_);
-    auto len = Vector2d(last_ - first_) + Vector2d(1, 1);
-    auto pos1 = pos.y() * len.x() + pos.x();
-    auto z = c_.z - chunk_z_min;
-    constexpr auto depth_start = -1 + 1.111e-16;
-
-    double chunk_offset, tile_offset;
-
-    if (c_.z < chunk_z_max)
-    {
-        chunk_offset = depth_start + tile_shader::depth_chunk_size * pos1;
-        tile_offset = (double)tile_shader::depth_value({z, z});
-    }
-    else
-    {
-        chunk_offset = 1;
-        tile_offset = 0;
-    }
-
-    double depth_offset_ = chunk_offset + tile_offset;
-    auto depth_offset = (float)depth_offset_;
-
-    _shader.set_camera_offset(offset, depth_offset);
+    auto z = (int)(c_.z - chunk_z_min);
+    auto pos  = chunk_coords(c_) - first_;
+    auto len = (last_ - first_) + Vector2i(1, 1);
+    constexpr auto depth_start = -1 + 1.111e-16f;
+
+    int depth = TILE_MAX_DIM * pos.x() +
+                (int)TILE_COUNT * len.x() * pos.y() +
+                z * (TILE_MAX_DIM+1);
+
+#if 1
+    if (c_.z == 0)
+        printf("c=(%2hd %2hd %2hhd) pos=(%2d %2d) len=(%d %d) --> %d\n", c_.x, c_.y, c_.z, pos.x(), pos.y(), len.x(), len.y(), depth);
+#endif
+
+    float d = depth * tile_shader::depth_tile_size + depth_start;
+
+    if (c_.z == chunk_z_max)
+        d = 1;
+
+    _shader.set_camera_offset(offset, d);
 }
 
 with_shifted_camera_offset::~with_shifted_camera_offset()