depth buffer works!

1 files changed, 10 insertions, 0 deletions

diff --git a/shaders/tile.cpp b/shaders/tile.cpp
index 2fb37cd8..c8261acd 100644
--- a/shaders/tile.cpp
+++ b/shaders/tile.cpp
@@ -1,6 +1,7 @@
 #include "shaders/tile.hpp"
 #include "loader.hpp"
 #include "compat/assert.hpp"
+#include "local-coords.hpp"
 #include <Magnum/Math/Vector4.h>
 #include <Magnum/GL/Context.h>
 #include <Magnum/GL/Shader.h>
@@ -65,4 +66,13 @@ void tile_shader::_draw()
     }
 }
 
+float tile_shader::depth_value(const local_coords& xy) noexcept
+{
+    constexpr float max = (TILE_MAX_DIM+1)*(TILE_MAX_DIM+1) * .5f;
+    constexpr float min = -1 + 1.f/256;
+    float value = min + xy.to_index()/max;
+    fm_assert(value > -1 && value < 1);
+    return value;
+}
+
 } // namespace floormat