minor optimizations in chunk

[blank.git] / src / shape.hpp

diff --git a/src/shape.hpp b/src/shape.hpp
index 438fa101d1a9a748cbce4c345762dbf7d1b804d6..4120f76b938ab0ef5a01431aa6ce08633fabd7f7 100644 (file)
--- a/src/shape.hpp
+++ b/src/shape.hpp
@@ -2,6 +2,7 @@
 #define BLANK_SHAPE_HPP_
 
 #include "geometry.hpp"
+#include "model.hpp"
 
 #include <vector>
 #include <glm/glm.hpp>
@@ -11,14 +12,93 @@ namespace blank {
 
 struct Shape {
 
-       virtual size_t VertexCount() const = 0;
-       virtual void Vertices(std::vector<glm::vec3> &, const glm::vec3 &pos = { 0.0f, 0.0f, 0.0f }) const = 0;
-       virtual void Normals(std::vector<glm::vec3> &) const = 0;
+       /// the number of vertices (and normals) this shape has
+       size_t VertexCount() const noexcept { return vtx_pos.size(); }
+       /// the number of vertex indices this shape has
+       size_t VertexIndexCount() const noexcept { return vtx_idx.size(); }
+
+       const Model::Normal &VertexNormal(size_t idx) const noexcept { return vtx_nrm[idx]; }
+       Model::Normal VertexNormal(
+               size_t idx, const glm::mat4 &transform
+       ) const noexcept {
+               return Model::Normal(transform * glm::vec4(vtx_nrm[idx], 0.0f));
+       }
+
+       /// fill given buffers with this shape's elements with an
+       /// optional transform and offset
+       void Vertices(
+               Model::Positions &vertex,
+               Model::Normals &normal,
+               Model::Indices &index
+       ) const;
+       void Vertices(
+               Model::Positions &vertex,
+               Model::Normals &normal,
+               Model::Indices &index,
+               const glm::mat4 &transform,
+               Model::Index idx_offset = 0
+       ) const;
+       void Vertices(
+               BlockModel::Positions &vertex,
+               BlockModel::Indices &index,
+               const glm::mat4 &transform,
+               BlockModel::Index idx_offset = 0
+       ) const;
+
+       /// the number of vertices this shape's outline has
+       size_t OutlineCount() const { return out_pos.size(); }
+       /// the number of vertex indices this shape's outline has
+       size_t OutlineIndexCount() const { return out_idx.size(); }
+
+       /// fill given buffers with this shape's outline's elements with
+       /// an optional offset
+       void Outline(
+               OutlineModel::Positions &vertex,
+               OutlineModel::Indices &index,
+               const OutlineModel::Position &offset = { 0.0f, 0.0f, 0.0f },
+               OutlineModel::Index idx_offset = 0
+       ) const;
+
+       /// Check if given ray would pass though this shape if it were
+       /// transformed with given matrix.
+       /// If true, dist and normal hold the intersection distance and
+       /// normal, otherwise their content is undefined.
+       virtual bool Intersects(
+               const Ray &,
+               const glm::mat4 &,
+               float &dist,
+               glm::vec3 &normal
+       ) const noexcept = 0;
+
+protected:
+       void SetShape(const Model::Positions &pos, const Model::Normals &nrm, const Model::Indices &idx) {
+               vtx_pos = pos;
+               vtx_nrm = nrm;
+               vtx_idx = idx;
+       }
+       void SetOutline(const OutlineModel::Positions &pos, const OutlineModel::Indices &idx) {
+               out_pos = pos;
+               out_idx = idx;
+       }
+
+private:
+       Model::Positions vtx_pos;
+       Model::Normals vtx_nrm;
+       Model::Indices vtx_idx;
+
+       OutlineModel::Positions out_pos;
+       OutlineModel::Indices out_idx;
+
+};
 
-       virtual size_t OutlineCount() const = 0;
-       virtual void Outline(std::vector<glm::vec3> &, const glm::vec3 &pos = { 0.0f, 0.0f, 0.0f }) const = 0;
 
-       virtual bool Intersects(const Ray &, const glm::mat4 &, float &dist, glm::vec3 &normal) const = 0;
+class NullShape
+: public Shape {
+
+public:
+       NullShape();
+
+       bool Intersects(const Ray &, const glm::mat4 &, float &, glm::vec3 &) const noexcept override;
 
 };
 
@@ -29,17 +109,24 @@ class CuboidShape
 public:
        CuboidShape(const AABB &bounds);
 
-       size_t VertexCount() const override;
-       void Vertices(std::vector<glm::vec3> &, const glm::vec3 &) const override;
-       void Normals(std::vector<glm::vec3> &) const override;
+       bool Intersects(const Ray &, const glm::mat4 &, float &, glm::vec3 &) const noexcept override;
 
-       size_t OutlineCount() const override;
-       void Outline(std::vector<glm::vec3> &, const glm::vec3 &) const override;
+private:
+       AABB bb;
+
+};
 
-       bool Intersects(const Ray &, const glm::mat4 &, float &, glm::vec3 &) const override;
+
+class StairShape
+: public Shape {
+
+public:
+       StairShape(const AABB &bounds, const glm::vec2 &clip);
+
+       bool Intersects(const Ray &, const glm::mat4 &, float &, glm::vec3 &) const noexcept override;
 
 private:
-       AABB bb;
+       AABB top, bot;
 
 };