1 files changed, 286 insertions, 0 deletions
diff --git a/src/game/shared/world/voxel.hh b/src/game/shared/world/voxel.hh
new file mode 100644
index 0000000..6013962
--- /dev/null
+++ b/src/game/shared/world/voxel.hh
@@ -0,0 +1,286 @@
+#pragma once
+
+#include "core/math/aabb.hh"
+
+#include "shared/types.hh"
+
+namespace world
+{
+class Dimension;
+} // namespace world
+
+namespace world
+{
+enum VoxelRender : unsigned int {
+    VRENDER_NONE = 0U, ///< The voxel is not rendered at all
+    VRENDER_OPAQUE,    ///< The voxel is fully opaque
+    VRENDER_BLEND,     ///< The voxel is blended (e.g. water, glass)
+};
+
+enum VoxelShape : unsigned int {
+    VSHAPE_CUBE = 0U, ///< Full cube shape
+    VSHAPE_CROSS,     ///< TODO: Cross shape
+    VSHAPE_MODEL,     ///< TODO: Custom model shape
+};
+
+enum VoxelFace : unsigned int {
+    VFACE_NORTH = 0U, ///< Positive Z face
+    VFACE_SOUTH,      ///< Negative Z face
+    VFACE_EAST,       ///< Positive X face
+    VFACE_WEST,       ///< Negative X face
+    VFACE_TOP,        ///< Positive Y face
+    VFACE_BOTTOM,     ///< Negative Y face
+    VFACE_CROSS_NWSE, ///< Diagonal cross face northwest-southeast
+    VFACE_CROSS_NESW, ///< Diagonal cross face northeast-southwest
+    VFACE_COUNT
+};
+
+enum VoxelTouch : unsigned int {
+    VTOUCH_NONE = 0xFFFFU,
+    VTOUCH_SOLID = 0U, ///< The entity is stopped in its tracks
+    VTOUCH_BOUNCE,     ///< The entity bounces back with some energy loss
+    VTOUCH_SINK,       ///< The entity phases/sinks through the voxel
+};
+
+enum VoxelMaterial : unsigned int {
+    VMAT_UNKNOWN = 0xFFFFU,
+    VMAT_DEFAULT = 0U,
+    VMAT_STONE,
+    VMAT_DIRT,
+    VMAT_GLASS,
+    VMAT_GRASS,
+    VMAT_GRAVEL,
+    VMAT_METAL,
+    VMAT_SAND,
+    VMAT_WOOD,
+    VMAT_SLOSH,
+    VMAT_COUNT
+};
+
+enum VoxelVisBits : unsigned int {
+    VVIS_NORTH = 1U << VFACE_NORTH, ///< Positive Z
+    VVIS_SOUTH = 1U << VFACE_SOUTH, ///< Negative Z
+    VVIS_EAST = 1U << VFACE_EAST,   ///< Positive X
+    VVIS_WEST = 1U << VFACE_WEST,   ///< Negative X
+    VVIS_UP = 1U << VFACE_TOP,      ///< Positive Y
+    VVIS_DOWN = 1U << VFACE_BOTTOM, ///< Negative Y
+};
+} // namespace world
+
+namespace world
+{
+using VoxelOnPlaceFunc = std::function<void(Dimension*, const voxel_pos&)>;
+using VoxelOnRemoveFunc = std::function<void(Dimension*, const voxel_pos&)>;
+using VoxelOnTickFunc = std::function<void(Dimension*, const voxel_pos&)>;
+} // namespace world
+
+namespace world
+{
+class Voxel {
+public:
+    Voxel(void) = default;
+    explicit Voxel(const Voxel& source, voxel_id id) noexcept;
+
+    void on_place(Dimension* dimension, const voxel_pos& vpos) const;
+    void on_remove(Dimension* dimension, const voxel_pos& vpos) const;
+    void on_tick(Dimension* dimension, const voxel_pos& vpos) const;
+
+    constexpr std::string_view get_name(void) const noexcept;
+    constexpr voxel_id get_id(void) const noexcept;
+
+    constexpr VoxelRender get_render_mode(void) const noexcept;
+    constexpr VoxelShape get_shape(void) const noexcept;
+    constexpr bool is_animated(void) const noexcept;
+
+    constexpr VoxelTouch get_touch_type(void) const noexcept;
+    constexpr const glm::fvec3& get_touch_values(void) const noexcept;
+    constexpr VoxelMaterial get_surface_material(void) const noexcept;
+
+    constexpr const math::AABBf& get_collision(void) const noexcept;
+
+    constexpr const std::vector<std::string>& get_default_textures(void) const noexcept;
+    constexpr const std::vector<std::string>& get_face_textures(VoxelFace face) const noexcept;
+    constexpr std::size_t get_cached_face_offset(VoxelFace face) const noexcept;
+    constexpr std::size_t get_cached_face_plane(VoxelFace face) const noexcept;
+
+    template<VoxelRender RenderMode>
+    constexpr bool is_render_mode(void) const noexcept;
+    template<VoxelShape Shape>
+    constexpr bool is_shape(void) const noexcept;
+    template<VoxelTouch TouchType>
+    constexpr bool is_touch_type(void) const noexcept;
+    template<VoxelMaterial Material>
+    constexpr bool is_surface_material(void) const noexcept;
+
+    /// Non-model voxel shapes support texture variation based on the
+    /// voxel position on the world; this method handles the math behind this
+    /// @param face The face of the voxel to get the texture index for
+    /// @param vpos The absolute voxel position to get the texture index for
+    /// @return The index of the texture to use for the given face at the given position
+    /// @remarks On client-side: plane[get_cached_face_plane][get_cached_face_offset + thisFunctionResult]
+    std::size_t get_random_texture_index(VoxelFace face, const voxel_pos& vpos) const;
+
+    /// Assign cached plane index and plane offset for a given face
+    /// @param face The face to assign the cache for
+    /// @param offset The offset to assign to the face
+    /// @param plane The plane index to assign to the face
+    void set_face_cache(VoxelFace face, std::size_t offset, std::size_t plane);
+
+    /// Calculate a checksum for the voxel's properties
+    /// @param combine An optional initial checksum to combine with
+    /// @return The calculated checksum
+    std::uint64_t get_checksum(std::uint64_t combine = 0U) const;
+
+protected:
+    std::string m_name;
+    voxel_id m_id { NULL_VOXEL_ID };
+
+    VoxelRender m_render_mode { VRENDER_OPAQUE };
+    VoxelShape m_shape { VSHAPE_CUBE };
+    bool m_animated { false };
+
+    VoxelTouch m_touch_type { VTOUCH_SOLID };
+    glm::fvec3 m_touch_values { 0.0f };
+    VoxelMaterial m_surface_material { VMAT_DEFAULT };
+
+    math::AABBf m_collision { { 0.0f, 0.0f, 0.0f }, { 1.0f, 1.0f, 1.0f } };
+
+    std::vector<std::string> m_default_textures;
+    std::array<std::vector<std::string>, VFACE_COUNT> m_face_textures;
+    std::array<std::size_t, VFACE_COUNT> m_cached_face_offsets;
+    std::array<std::size_t, VFACE_COUNT> m_cached_face_planes;
+
+    VoxelOnPlaceFunc m_on_place;
+    VoxelOnRemoveFunc m_on_remove;
+    VoxelOnTickFunc m_on_tick;
+};
+} // namespace world
+
+namespace world
+{
+class VoxelBuilder final : public Voxel {
+public:
+    VoxelBuilder(void) = default;
+    explicit VoxelBuilder(std::string_view name);
+
+    void set_on_place(VoxelOnPlaceFunc func) noexcept;
+    void set_on_remove(VoxelOnRemoveFunc func) noexcept;
+    void set_on_tick(VoxelOnTickFunc func) noexcept;
+
+    void set_name(std::string_view name) noexcept;
+
+    void set_render_mode(VoxelRender mode) noexcept;
+    void set_shape(VoxelShape shape) noexcept;
+    void set_animated(bool animated) noexcept;
+
+    void set_touch_type(VoxelTouch type) noexcept;
+    void set_touch_values(const glm::fvec3& values) noexcept;
+    void set_surface_material(VoxelMaterial material) noexcept;
+
+    void set_collision(const math::AABBf& box) noexcept;
+
+    void add_default_texture(std::string_view path);
+    void add_face_texture(VoxelFace face, std::string_view path);
+
+    std::unique_ptr<Voxel> build(voxel_id id) const;
+};
+} // namespace world
+
+constexpr std::string_view world::Voxel::get_name(void) const noexcept
+{
+    return m_name;
+}
+
+constexpr voxel_id world::Voxel::get_id(void) const noexcept
+{
+    return m_id;
+}
+
+constexpr world::VoxelRender world::Voxel::get_render_mode(void) const noexcept
+{
+    return m_render_mode;
+}
+
+constexpr world::VoxelShape world::Voxel::get_shape(void) const noexcept
+{
+    return m_shape;
+}
+
+constexpr bool world::Voxel::is_animated(void) const noexcept
+{
+    return m_animated;
+}
+
+constexpr world::VoxelTouch world::Voxel::get_touch_type(void) const noexcept
+{
+    return m_touch_type;
+}
+
+constexpr const glm::fvec3& world::Voxel::get_touch_values(void) const noexcept
+{
+    return m_touch_values;
+}
+
+constexpr world::VoxelMaterial world::Voxel::get_surface_material(void) const noexcept
+{
+    return m_surface_material;
+}
+
+constexpr const math::AABBf& world::Voxel::get_collision(void) const noexcept
+{
+    return m_collision;
+}
+
+constexpr const std::vector<std::string>& world::Voxel::get_default_textures(void) const noexcept
+{
+    return m_default_textures;
+}
+
+constexpr const std::vector<std::string>& world::Voxel::get_face_textures(VoxelFace face) const noexcept
+{
+    assert(face <= m_face_textures.size());
+
+    if(m_face_textures[face].empty()) {
+        return m_default_textures;
+    }
+
+    return m_face_textures[face];
+}
+
+constexpr std::size_t world::Voxel::get_cached_face_offset(VoxelFace face) const noexcept
+{
+    assert(face <= m_cached_face_offsets.size());
+
+    return m_cached_face_offsets[face];
+}
+
+constexpr std::size_t world::Voxel::get_cached_face_plane(VoxelFace face) const noexcept
+{
+    assert(face <= m_cached_face_planes.size());
+
+    return m_cached_face_planes[face];
+}
+
+template<world::VoxelRender RenderMode>
+constexpr bool world::Voxel::is_render_mode(void) const noexcept
+{
+    return m_render_mode == RenderMode;
+}
+
+template<world::VoxelShape Shape>
+constexpr bool world::Voxel::is_shape(void) const noexcept
+{
+    return m_shape == Shape;
+}
+
+template<world::VoxelTouch TouchType>
+constexpr bool world::Voxel::is_touch_type(void) const noexcept
+{
+    return m_touch_type == TouchType;
+}
+
+template<world::VoxelMaterial Material>
+constexpr bool world::Voxel::is_surface_material(void) const noexcept
+{
+    return m_surface_material == Material;
+}