core: rename mbgl directories to mln (#4511)

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

include/mln/gfx/draw_mode.hpp

@@ -0,0 +1,94 @@
+#pragma once
+
+#include <mln/gfx/types.hpp>
+
+#include <cassert>
+#include <cstddef>
+#include <type_traits>
+
+namespace mln {
+namespace gfx {
+
+class DrawMode {
+protected:
+    DrawMode(DrawModeType type_, float size_)
+        : type(type_),
+          size(size_) {}
+
+public:
+    const DrawModeType type;
+    const float size;
+};
+
+template <class>
+struct BufferGroupSizeOf;
+template <class>
+struct PrimitiveTypeOf;
+
+class Points : public DrawMode {
+public:
+    explicit Points(float pointSize_)
+        : DrawMode(DrawModeType::Points, pointSize_) {
+        assert(size > 0);
+    }
+};
+
+template <>
+struct BufferGroupSizeOf<Points> : std::integral_constant<std::size_t, 1> {};
+template <>
+struct PrimitiveTypeOf<Points> : std::integral_constant<PrimitiveType, PrimitiveType::Point> {};
+
+class Lines : public DrawMode {
+public:
+    explicit Lines(float lineWidth_)
+        : DrawMode(DrawModeType::Lines, lineWidth_) {
+        assert(size > 0);
+    }
+};
+
+template <>
+struct BufferGroupSizeOf<Lines> : std::integral_constant<std::size_t, 2> {};
+template <>
+struct PrimitiveTypeOf<Lines> : std::integral_constant<PrimitiveType, PrimitiveType::Line> {};
+
+// LineStrip is a form of "Line" rendering, but the element buffer
+// cannot be grouped into logical elements beyond a single Point.
+class LineStrip : public DrawMode {
+public:
+    explicit LineStrip(float lineWidth_)
+        : DrawMode(DrawModeType::LineStrip, lineWidth_) {
+        assert(size > 0);
+    }
+};
+
+template <>
+struct BufferGroupSizeOf<LineStrip> : std::integral_constant<std::size_t, 1> {};
+template <>
+struct PrimitiveTypeOf<LineStrip> : std::integral_constant<PrimitiveType, PrimitiveType::Line> {};
+
+class Triangles : public DrawMode {
+public:
+    explicit Triangles()
+        : DrawMode(DrawModeType::Triangles, 0) {}
+};
+
+template <>
+struct BufferGroupSizeOf<Triangles> : std::integral_constant<std::size_t, 3> {};
+template <>
+struct PrimitiveTypeOf<Triangles> : std::integral_constant<PrimitiveType, PrimitiveType::Triangle> {};
+
+// TriangleStrip is a form of "Triangle" rendering, but the element buffer
+// cannot be grouped into logical elements beyond a single Point.
+class TriangleStrip : public DrawMode {
+public:
+    explicit TriangleStrip()
+        : DrawMode(DrawModeType::TriangleStrip, 0) {}
+};
+
+template <>
+struct BufferGroupSizeOf<TriangleStrip> : std::integral_constant<std::size_t, 1> {};
+template <>
+struct PrimitiveTypeOf<TriangleStrip> : std::integral_constant<PrimitiveType, PrimitiveType::Triangle> {};
+
+} // namespace gfx
+} // namespace mln