1 files changed, 49 insertions, 0 deletions
diff --git a/shaders/lightmap.hpp b/shaders/lightmap.hpp
new file mode 100644
index 00000000..a2d566e6
--- /dev/null
+++ b/shaders/lightmap.hpp
@@ -0,0 +1,49 @@
+#pragma once
+
+#include "light-falloff.hpp"
+#include <Magnum/GL/AbstractShaderProgram.h>
+#include <Magnum/Math/Vector2.h>
+#include <Magnum/Math/Vector3.h>
+#include <Magnum/Math/Vector4.h>
+#include <Magnum/Math/Color.h>
+
+namespace floormat {
+
+struct local_coords;
+
+struct lightmap_shader final : GL::AbstractShaderProgram
+{
+    using Position = GL::Attribute<0, Vector2>;
+
+    explicit lightmap_shader();
+    ~lightmap_shader() override;
+
+    void set_light(Vector2i neighbor_offset, local_coords pos, Vector2b offset);
+    struct light light() const; // is a reader accessor needed?
+
+private:
+    static Vector2i get_px_pos(Vector2i neighbor_offset, local_coords pos, Vector2b offset);
+
+    struct light_u final
+    {
+        Vector4 color_and_intensity;
+        Vector2 center;
+        uint32_t mode;
+    };
+
+    struct light_s final
+    {
+        float intensity = 1;
+        Color3ub color {255, 255, 255};
+        Vector2i center;
+        light_falloff falloff;
+
+        bool operator==(const light_s&) const noexcept;
+    };
+
+    enum { ColorUniform = 0, CenterUniform = 1, FalloffUniform = 2, DepthUniform = 3, };
+
+    light_s _light;
+};
+
+} // namespace floormat