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#pragma once
#include "config/types.h"
#include "gfx/gl/glBuffer.h"
#include <gfx/gl/glVertexArray.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(std::span<const RelativePosition3D>);
RelativePosition3D minExtent, maxExtent;
RelativePosition3D centre;
RelativeDistance size;
private:
Dimensions(std::span<const RelativePosition3D>, const std::array<Extents1D, 3> &);
static Extents1D extents(std::span<const RelativePosition3D>, glm::length_t);
};
void draw() const;
void drawInstanced(GLuint vao, GLsizei count, GLuint base = 0) const;
[[nodiscard]] const Dimensions &
getDimensions() const
{
return dimensions;
}
protected:
MeshBase(GLsizei numIndices, GLenum mode, const std::vector<RelativePosition3D> &);
glVertexArray vertexArrayObject;
glBuffers<2> vertexArrayBuffers;
GLsizei 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 & vertex) {
return static_cast<RelativePosition3D>(vertex.pos);
}))}
{
vertexArrayBuffers[0].storage(vertices, 0);
vertexArrayBuffers[1].storage(indices, 0);
configureVAO(vertexArrayObject, 0);
}
auto
configureVAO(glVertexArray & vao, GLuint divisor) const
{
return vao.configure().addAttribsFor<V>(divisor, vertexArrayBuffers[0]).addIndices(vertexArrayBuffers[1]);
}
};
using Mesh = MeshT<Vertex>;
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