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Implement Mesh partitioning

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This commit is contained in:
Cristian Gora
2026-09-27 17:48:22 +02:00
parent 11426fe8fb
commit 850a6f601b
21 changed files with 1146638 additions and 181 deletions
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45
src/mesh.cpp
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@@ -7,7 +7,8 @@ namespace Fan
{
Rc<Mesh> Mesh::create(const std::vector<Vertex>& vertices,
const std::vector<GLuint>& indices/* = {}*/)
const std::vector<GLuint>& indices/* = {}*/,
const std::vector<SubMesh>& submeshes/* = {}*/)
{
GLuint VBO{}, VAO{}, EBO{};
bool has_indices = !indices.empty();
@@ -38,7 +39,18 @@ Rc<Mesh> Mesh::create(const std::vector<Vertex>& vertices,
glEnableVertexAttribArray(1);
glEnableVertexAttribArray(2);
return make_rc<Mesh>(vertices, indices, has_indices, VBO, VAO, EBO);
// Submesh setup
std::vector<SubMesh> final_submeshes = submeshes;
// If no submeshes were explicitly defined, create one default submesh spanning the entire mesh
if (final_submeshes.empty()) {
SubMesh default_submesh{};
default_submesh.index_offset = 0;
default_submesh.index_count = indices.empty() ? vertices.size() : indices.size();
final_submeshes.push_back(default_submesh);
}
return make_rc<Mesh>(vertices, indices, final_submeshes, has_indices, VBO, VAO, EBO);
}
Mesh::~Mesh()
@@ -51,6 +63,7 @@ Mesh::~Mesh()
Mesh::Mesh(Mesh&& other) noexcept
: m_vertices(std::move(other.m_vertices))
, m_indices(std::move(other.m_indices))
, m_submeshes(std::move(other.m_submeshes))
, m_has_indices(std::exchange(other.m_has_indices, false))
, m_VBO(std::exchange(other.m_VBO, 0))
, m_VAO(std::exchange(other.m_VAO, 0))
@@ -64,6 +77,7 @@ Mesh& Mesh::operator=(Mesh&& other) noexcept
std::swap(m_vertices, other.m_vertices);
std::swap(m_indices, other.m_indices);
std::swap(m_submeshes, other.m_submeshes);
std::swap(m_has_indices, other.m_has_indices);
std::swap(m_VBO, other.m_VBO);
std::swap(m_VAO, other.m_VAO);
@@ -72,15 +86,34 @@ Mesh& Mesh::operator=(Mesh&& other) noexcept
return *this;
}
const std::vector<Mesh::SubMesh>& Mesh::get_submeshes() const
{
return m_submeshes;
}
void Mesh::draw() const
{
glBindVertexArray(m_VAO);
if (m_has_indices) {
glDrawElements(GL_TRIANGLES, m_indices.size(), GL_UNSIGNED_INT, 0);
} else {
glDrawArrays(GL_TRIANGLES, 0, m_vertices.size());
for (const auto& submesh : m_submeshes) {
draw_submesh(submesh.index_offset, submesh.index_count);
}
glBindVertexArray(0);
}
void Mesh::draw_submesh(GLuint index_offset, GLuint index_count) const
{
glBindVertexArray(m_VAO);
if (m_has_indices) {
glDrawElements(GL_TRIANGLES, index_count, GL_UNSIGNED_INT,
reinterpret_cast<const void*>(index_offset * sizeof(GLuint)));
} else {
glDrawArrays(GL_TRIANGLES, index_offset, index_count);
}
glBindVertexArray(0);
}
} // namespace Fan