src/graphics/SpriteMesh.hpp

   1 #ifndef BLANK_GRPAHICS_SPRITEMESH_HPP_
   2 #define BLANK_GRPAHICS_SPRITEMESH_HPP_
   3
   4 #include "glm.hpp"
   5 #include "VertexArray.hpp"
   6
   7 #include <vector>
   8 #include <GL/glew.h>
   9
  10
  11 namespace blank {
  12
  13 class SpriteMesh {
  14
  15 public:
  16         using Position = glm::vec3;
  17         using TexCoord = glm::vec2;
  18         using Index = unsigned short;
  19
  20         using Positions = std::vector<Position>;
  21         using TexCoords = std::vector<TexCoord>;
  22         using Indices = std::vector<Index>;
  23
  24         enum Attribute {
  25                 ATTRIB_VERTEX,
  26                 ATTRIB_TEXCOORD,
  27                 ATTRIB_INDEX,
  28                 ATTRIB_COUNT,
  29         };
  30
  31         struct Buffer {
  32
  33                 Positions vertices;
  34                 TexCoords coords;
  35                 Indices indices;
  36
  37                 void Clear() noexcept {
  38                         vertices.clear();
  39                         coords.clear();
  40                         indices.clear();
  41                 }
  42
  43                 void Reserve(size_t p, size_t i) {
  44                         vertices.reserve(p);
  45                         coords.reserve(p);
  46                         indices.reserve(i);
  47                 }
  48
  49                 void LoadRect(
  50                         float w, float h,
  51                         const glm::vec2 &pivot = glm::vec2(0.0f),
  52                         const glm::vec2 &tex_begin = glm::vec2(0.0f),
  53                         const glm::vec2 &tex_end = glm::vec2(1.0f, 1.0f)
  54                 );
  55
  56         };
  57
  58         using VAO = VertexArray<ATTRIB_COUNT>;
  59
  60 public:
  61         void Update(const Buffer &) noexcept;
  62
  63         bool Empty() const noexcept {
  64                 return vao.Empty();
  65         }
  66
  67         void Draw() const noexcept {
  68                 vao.DrawTriangleElements();
  69         }
  70
  71 private:
  72         VAO vao;
  73
  74 };
  75
  76 }
  77
  78 #endif