src/world/creature.cpp

   1 #include "Creature.hpp"
   2
   3 #include "Body.hpp"
   4
   5 #include <glm/gtx/transform.hpp>
   6
   7
   8 namespace blobs {
   9 namespace world {
  10
  11 Creature::Creature()
  12 : vao() {
  13 }
  14
  15 Creature::~Creature() {
  16 }
  17
  18
  19 glm::dmat4 Creature::LocalTransform() noexcept {
  20         // TODO: surface transform
  21         constexpr double half_height = 0.25;
  22         return glm::translate(glm::dvec3(position.x, position.y, position.z + body->Radius() + half_height))
  23                 * glm::scale(glm::dvec3(half_height, half_height, half_height));
  24 }
  25
  26 void Creature::BuildVAO() {
  27         vao.Bind();
  28         vao.BindAttributes();
  29         vao.EnableAttribute(0);
  30         vao.EnableAttribute(1);
  31         vao.EnableAttribute(2);
  32         vao.AttributePointer<glm::vec3>(0, false, offsetof(Attributes, position));
  33         vao.AttributePointer<glm::vec3>(1, false, offsetof(Attributes, normal));
  34         vao.AttributePointer<glm::vec3>(2, false, offsetof(Attributes, texture));
  35         vao.ReserveAttributes(6 * 4, GL_STATIC_DRAW);
  36         {
  37                 auto attrib = vao.MapAttributes(GL_WRITE_ONLY);
  38                 const float offset = 1.0f;
  39                 for (int surface = 0; surface < 6; ++surface) {
  40                         const float tex_u_begin = surface < 3 ? 1.0f : 0.0f;
  41                         const float tex_u_end = surface < 3 ? 0.0f : 1.0f;
  42
  43                         attrib[4 * surface + 0].position[(surface + 0) % 3] = -offset;
  44                         attrib[4 * surface + 0].position[(surface + 1) % 3] = -offset;
  45                         attrib[4 * surface + 0].position[(surface + 2) % 3] = surface < 3 ? offset : -offset;
  46                         attrib[4 * surface + 0].normal[(surface + 0) % 3] = 0.0f;
  47                         attrib[4 * surface + 0].normal[(surface + 1) % 3] = 0.0f;
  48                         attrib[4 * surface + 0].normal[(surface + 2) % 3] = surface < 3 ? 1.0f : -1.0f;
  49                         attrib[4 * surface + 0].texture.x = tex_u_begin;
  50                         attrib[4 * surface + 0].texture.y = 1.0f;
  51                         attrib[4 * surface + 0].texture.z = surface;
  52
  53                         attrib[4 * surface + 1].position[(surface + 0) % 3] = -offset;
  54                         attrib[4 * surface + 1].position[(surface + 1) % 3] =  offset;
  55                         attrib[4 * surface + 1].position[(surface + 2) % 3] = surface < 3 ? offset : -offset;
  56                         attrib[4 * surface + 1].normal[(surface + 0) % 3] = 0.0f;
  57                         attrib[4 * surface + 1].normal[(surface + 1) % 3] = 0.0f;
  58                         attrib[4 * surface + 1].normal[(surface + 2) % 3] = surface < 3 ? 1.0f : -1.0f;
  59                         attrib[4 * surface + 1].texture.x = tex_u_end;
  60                         attrib[4 * surface + 1].texture.y = 1.0f;
  61                         attrib[4 * surface + 1].texture.z = surface;
  62
  63                         attrib[4 * surface + 2].position[(surface + 0) % 3] =  offset;
  64                         attrib[4 * surface + 2].position[(surface + 1) % 3] = -offset;
  65                         attrib[4 * surface + 2].position[(surface + 2) % 3] = surface < 3 ? offset : -offset;
  66                         attrib[4 * surface + 2].normal[(surface + 0) % 3] = 0.0f;
  67                         attrib[4 * surface + 2].normal[(surface + 1) % 3] = 0.0f;
  68                         attrib[4 * surface + 2].normal[(surface + 2) % 3] = surface < 3 ? 1.0f : -1.0f;
  69                         attrib[4 * surface + 2].texture.x = tex_u_begin;
  70                         attrib[4 * surface + 2].texture.y = 0.0f;
  71                         attrib[4 * surface + 2].texture.z = surface;
  72
  73                         attrib[4 * surface + 3].position[(surface + 0) % 3] = offset;
  74                         attrib[4 * surface + 3].position[(surface + 1) % 3] = offset;
  75                         attrib[4 * surface + 3].position[(surface + 2) % 3] = surface < 3 ? offset : -offset;
  76                         attrib[4 * surface + 3].normal[(surface + 0) % 3] = 0.0f;
  77                         attrib[4 * surface + 3].normal[(surface + 1) % 3] = 0.0f;
  78                         attrib[4 * surface + 3].normal[(surface + 2) % 3] = surface < 3 ? 1.0f : -1.0f;
  79                         attrib[4 * surface + 3].texture.x = tex_u_end;
  80                         attrib[4 * surface + 3].texture.y = 0.0f;
  81                         attrib[4 * surface + 3].texture.z = surface;
  82                 }
  83         }
  84         vao.BindElements();
  85         vao.ReserveElements(6 * 6, GL_STATIC_DRAW);
  86         {
  87                 auto element = vao.MapElements(GL_WRITE_ONLY);
  88                 for (int surface = 0; surface < 3; ++surface) {
  89                         element[6 * surface + 0] = 4 * surface + 0;
  90                         element[6 * surface + 1] = 4 * surface + 2;
  91                         element[6 * surface + 2] = 4 * surface + 1;
  92                         element[6 * surface + 3] = 4 * surface + 1;
  93                         element[6 * surface + 4] = 4 * surface + 2;
  94                         element[6 * surface + 5] = 4 * surface + 3;
  95                 }
  96                 for (int surface = 3; surface < 6; ++surface) {
  97                         element[6 * surface + 0] = 4 * surface + 0;
  98                         element[6 * surface + 1] = 4 * surface + 1;
  99                         element[6 * surface + 2] = 4 * surface + 2;
 100                         element[6 * surface + 3] = 4 * surface + 2;
 101                         element[6 * surface + 4] = 4 * surface + 1;
 102                         element[6 * surface + 5] = 4 * surface + 3;
 103                 }
 104         }
 105         vao.Unbind();
 106 }
 107
 108 void Creature::Draw(app::Assets &assets, graphics::Viewport &viewport) {
 109         vao.Bind();
 110         vao.DrawTriangles(6 * 6);
 111 }
 112
 113 }
 114 }