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#pragma once
#include "config/types.h"
#include "gfx/gl/vertexArrayObject.h"
#include <glArrays.h>
#include <glad/gl.h>
#include <ranges>
#include <span>
#include <stdTypeDefs.h>
class Vertex;
class MeshBase {
public:
class Dimensions {
public:
using Extents1D = std::ranges::minmax_result<RelativeDistance>;
explicit Dimensions(const std::span<const RelativePosition3D>);
RelativePosition3D minExtent, maxExtent;
RelativePosition3D centre;
RelativeDistance size;
private:
Dimensions(const std::span<const RelativePosition3D>, const std::array<Extents1D, 3> &);
static Extents1D extents(const std::span<const RelativePosition3D>, glm::length_t D);
};
void Draw() const;
void DrawInstanced(GLuint vao, GLsizei count, GLuint base = 0) const;
[[nodiscard]] const Dimensions &
getDimensions() const
{
return dimensions;
}
protected:
MeshBase(GLsizei m_numIndices, GLenum mode, const std::vector<RelativePosition3D> &);
glVertexArray m_vertexArrayObject;
glBuffers<2> m_vertexArrayBuffers;
GLsizei m_numIndices;
GLenum mode;
Dimensions dimensions;
};
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,
materializeRange(vertices | std::views::transform([](const auto & v) {
return static_cast<RelativePosition3D>(v.pos);
}))}
{
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]);
}
};
using Mesh = MeshT<Vertex>;
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