rename shader

1 files changed, 66 insertions, 0 deletions

diff --git a/shaders/tile.hpp b/shaders/tile.hpp
new file mode 100644
index 00000000..bbe57e52
--- /dev/null
+++ b/shaders/tile.hpp
@@ -0,0 +1,66 @@
+#pragma once
+#include "compat/defs.hpp"
+#include <Magnum/GL/AbstractShaderProgram.h>
+#include <Magnum/Math/Vector2.h>
+#include <Magnum/Math/Vector3.h>
+#include <Magnum/Math/Vector4.h>
+
+namespace floormat {
+
+struct tile_shader : GL::AbstractShaderProgram
+{
+    typedef GL::Attribute<0, Vector3> Position;
+    typedef GL::Attribute<1, Vector2> TextureCoordinates;
+
+    fm_DECLARE_DEFAULT_MOVE_ASSIGNMENT_(tile_shader);
+    fm_DECLARE_DELETED_COPY_ASSIGNMENT(tile_shader);
+
+    explicit tile_shader();
+    ~tile_shader() override;
+
+    Vector2 scale() const { return _scale; }
+    tile_shader& set_scale(const Vector2& scale);
+    Vector2d camera_offset() const { return _camera_offset; }
+    tile_shader& set_camera_offset(Vector2d camera_offset);
+    Vector4 tint() const { return _tint; }
+    tile_shader& set_tint(const Vector4& tint);
+
+    static constexpr Vector2d project(Vector3d pt);
+    static constexpr Vector2d unproject(Vector2d px);
+
+    template<typename T, typename... Xs>
+    auto draw(T&& mesh, Xs&&... xs) ->
+        decltype(GL::AbstractShaderProgram::draw(std::forward<T>(mesh), std::forward<Xs>(xs)...));
+
+private:
+    void _draw();
+
+    Vector2d _camera_offset;
+    Vector4 _tint;
+    Vector2 _scale;
+    Vector2 _real_camera_offset;
+
+    enum { ScaleUniform = 0, OffsetUniform = 1, TintUniform = 2, };
+};
+
+template<typename T, typename... Xs>
+auto tile_shader::draw(T&& mesh, Xs&&... xs) ->
+    decltype(GL::AbstractShaderProgram::draw(std::forward<T>(mesh), std::forward<Xs>(xs)...))
+{
+    _draw();
+    return GL::AbstractShaderProgram::draw(std::forward<T>(mesh), std::forward<Xs>(xs)...);
+}
+
+constexpr Vector2d tile_shader::project(const Vector3d pt)
+{
+    const auto x = pt[0], y = pt[1], z = pt[2];
+    return { (x-y), (x+y+z*2)*.59 };
+}
+
+constexpr Vector2d tile_shader::unproject(const Vector2d px)
+{
+    const auto X = px[0], Y = px[1];
+    return { X + 100 * Y / 59, 100 * Y / 59 - X };
+}
+
+} // namespace floormat