1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
|
#include "mesh.h"
#include "vertex.hpp"
#include <cstddef>
#define offset_ptr(T, m) (((char *)1) + offsetof(T, m) - 1)
Mesh::Mesh(const std::span<const Vertex> vertices, const std::span<const unsigned int> indices, GLenum m) :
m_vertexArrayObject {}, m_vertexArrayBuffers {}, m_numIndices {(GLsizei)indices.size()}, mode {m}
{
glGenVertexArrays(1, &m_vertexArrayObject);
glBindVertexArray(m_vertexArrayObject);
glGenBuffers(2, m_vertexArrayBuffers.data());
glBindBuffer(GL_ARRAY_BUFFER, m_vertexArrayBuffers[0]);
glBufferData(GL_ARRAY_BUFFER, (GLsizeiptr)(sizeof(Vertex) * vertices.size()), vertices.data(), GL_STATIC_DRAW);
glEnableVertexAttribArray(0);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), offset_ptr(Vertex, pos));
glEnableVertexAttribArray(1);
glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, sizeof(Vertex), offset_ptr(Vertex, texCoord));
glEnableVertexAttribArray(2);
glVertexAttribPointer(2, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), offset_ptr(Vertex, normal));
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, m_vertexArrayBuffers[1]);
glBufferData(
GL_ELEMENT_ARRAY_BUFFER, (GLsizeiptr)(sizeof(indices[0]) * indices.size()), indices.data(), GL_STATIC_DRAW);
glBindVertexArray(0);
}
Mesh::~Mesh()
{
glDeleteBuffers(NUM_BUFFERS, m_vertexArrayBuffers.data());
glDeleteVertexArrays(1, &m_vertexArrayObject);
}
void
Mesh::Draw() const
{
glBindVertexArray(m_vertexArrayObject);
glDrawElementsBaseVertex(mode, m_numIndices, GL_UNSIGNED_INT, nullptr, 0);
glBindVertexArray(0);
}
|
