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#pragma once
#include "config/types.h"
#include "gfx/gl/vertexArrayObject.h"
#include <glArrays.h>
#include <glad/gl.h>
#include <span>
#include <stdTypeDefs.h>
class Vertex;
class MeshBase {
public:
void Draw() const;
void DrawInstanced(GLuint vao, GLsizei count, GLuint base = 0) const;
auto
minExtent() const
{
return min;
}
auto
maxExtent() const
{
return max;
}
protected:
MeshBase(GLsizei m_numIndices, GLenum mode, std::pair<RelativePosition3D, RelativePosition3D> minmax);
glVertexArray m_vertexArrayObject;
glBuffers<2> m_vertexArrayBuffers;
GLsizei m_numIndices;
GLenum mode;
RelativePosition3D min, max;
};
template<typename V> class MeshT : public MeshBase, public ConstTypeDefs<MeshT<V>> {
public:
MeshT(const std::span<const V> vertices, const std::span<const unsigned int> indices, GLenum mode = GL_TRIANGLES) :
MeshBase {static_cast<GLsizei>(indices.size()), mode, extent(vertices)}
{
VertexArrayObject::data(vertices, m_vertexArrayBuffers[0], GL_ARRAY_BUFFER);
VertexArrayObject::data(indices, m_vertexArrayBuffers[1], GL_ARRAY_BUFFER);
configureVAO(m_vertexArrayObject);
}
VertexArrayObject &
configureVAO(VertexArrayObject && vao) const
{
return vao.addAttribsFor<V>(m_vertexArrayBuffers[0]).addIndices(m_vertexArrayBuffers[1]);
}
static auto
extent(const std::span<const V> vertices)
{
std::pair<decltype(V::pos), decltype(V::pos)> out {};
for (glm::length_t D {}; D < 3; ++D) {
const auto mm
= std::minmax_element(vertices.begin(), vertices.end(), [D](const auto & va, const auto & vb) {
return va.pos[D] < vb.pos[D];
});
out.first[D] = mm.first->pos[D];
out.second[D] = mm.second->pos[D];
}
return out;
}
};
using Mesh = MeshT<Vertex>;
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