shaders: fix imprecise float constant

1 files changed, 1 insertions, 1 deletions

diff --git a/shaders/shader.hpp b/shaders/shader.hpp
index 864e20b7..b431cba0 100644
--- a/shaders/shader.hpp
+++ b/shaders/shader.hpp
@@ -49,7 +49,7 @@ struct tile_shader final : private GL::AbstractShaderProgram
     static constexpr float wall_side_offset = 1 - 4./64;
     static constexpr float z_depth_offset = 1 + 4./64;
     static constexpr float depth_tile_size = 1.f/(TILE_MAX_DIM * 2 * max_screen_tiles.product());
-    static constexpr float foreshortening_factor = 0.578125f;
+    static constexpr float foreshortening_factor = float(0.577350269189625764509148780501957456L);
 
     tile_shader& set_sampler(Int sampler);
     Int sampler() const { return _sampler; }