src/graphics/PrimitiveMesh.hpp

   1 #ifndef BLANK_GRAPHICS_PRIMITIVEMESH_HPP_
   2 #define BLANK_GRAPHICS_PRIMITIVEMESH_HPP_
   3
   4 #include "VertexArray.hpp"
   5
   6 #include <vector>
   7 #include <GL/glew.h>
   8 #include <glm/glm.hpp>
   9
  10
  11 namespace blank {
  12
  13 struct AABB;
  14
  15 class PrimitiveMesh {
  16
  17 public:
  18         using Position = glm::vec3;
  19         using Color = glm::tvec4<unsigned char>;
  20         using Index = unsigned short;
  21
  22         using Positions = std::vector<Position>;
  23         using Colors = std::vector<Color>;
  24         using Indices = std::vector<Index>;
  25
  26         enum Attribute {
  27                 ATTRIB_VERTEX,
  28                 ATTRIB_COLOR,
  29                 ATTRIB_INDEX,
  30                 ATTRIB_COUNT,
  31         };
  32
  33         struct Buffer {
  34
  35                 Positions vertices;
  36                 Colors colors;
  37                 Indices indices;
  38
  39                 void Clear() noexcept {
  40                         vertices.clear();
  41                         colors.clear();
  42                         indices.clear();
  43                 }
  44
  45                 void Reserve(size_t p, size_t i) {
  46                         vertices.reserve(p);
  47                         colors.reserve(p);
  48                         indices.reserve(i);
  49                 }
  50
  51                 void FillRect(
  52                         float w, float h,
  53                         const Color &color = Color(0),
  54                         const glm::vec2 &pivot = glm::vec2(0.0f)
  55                 );
  56
  57                 void OutlineBox(
  58                         const AABB &,
  59                         const Color &color = Color(0)
  60                 );
  61
  62         };
  63
  64         using VAO = VertexArray<ATTRIB_COUNT>;
  65
  66 public:
  67         void Update(const Buffer &) noexcept;
  68
  69         bool Empty() const noexcept {
  70                 return vao.Empty();
  71         }
  72
  73         void DrawLines() const noexcept;
  74         void DrawTriangles() const noexcept {
  75                 vao.DrawTriangleElements();
  76         }
  77
  78 private:
  79         VAO vao;
  80
  81 };
  82
  83 }
  84
  85 #endif