shader: make depth offset constants constexpr

1 files changed, 6 insertions, 3 deletions

diff --git a/shaders/shader.hpp b/shaders/shader.hpp
index 280850b9..a8f778da 100644
--- a/shaders/shader.hpp
+++ b/shaders/shader.hpp
@@ -37,9 +37,12 @@ struct tile_shader : GL::AbstractShaderProgram
     template<typename T, typename... Xs>
     decltype(auto) draw(T&& mesh, Xs&&... xs);
 
-    static const Vector2s max_screen_tiles;
-    static const float depth_tile_size;
-    static const float character_depth_offset, scenery_depth_offset, wall_depth_offset, z_depth_offset;
+    static constexpr Vector2s max_screen_tiles = {8, 8};
+    static constexpr float character_depth_offset = 1 + 1./64;
+    static constexpr float scenery_depth_offset = 1 + 1./64;
+    static constexpr float wall_depth_offset = 1;
+    static constexpr float z_depth_offset = 1 + 2./64;
+    static constexpr float depth_tile_size = 1/(double)(TILE_MAX_DIM * 2 * max_screen_tiles.product());
 
 private:
     void _draw();