Primitives.h

// Copyright(c) 2019 - 2020, #Momo
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#pragma once

#include "Utilities/Array/ArrayView.h"
#include "Core/Resources/AssetManager.h"
#include "Utilities/Array/Array2D.h"

namespace MxEngine
{
    class Primitives
    {
    public:
        using TextureHandle = GResource<Texture>;

        static MeshHandle CreateMesh(const AABB& boundingBox, MeshData meshData);
        static MeshHandle CreateCube();
        static MeshHandle CreatePlane(size_t UVrepeats = 1);
        static MeshHandle CreateSphere(size_t polygons = 30);
        static MeshHandle CreateSurface(const Array2D<float>& heights);
        static TextureHandle CreateGridTexture(size_t textureSize = 512, float borderScale = 0.01f);

        template<typename Func>
        static MeshHandle CreateSurface(Func&& f, float xsize, float ysize, float step)
        {
            static_assert(std::is_same<float, decltype(f(0.0f, 0.0f))>::value, "Func must accept two floats and output one float");
            MX_ASSERT(step > 0.0f);
            MX_ASSERT(xsize > 0.0f);
            MX_ASSERT(ysize > 0.0f);

            size_t intxsize = static_cast<size_t>(xsize / step);
            size_t intysize = static_cast<size_t>(ysize / step);
            Array2D<float> heights;
            heights.resize(intxsize, intysize);

            for (size_t x = 0; x < intxsize; x++)
            {
                for (size_t y = 0; y < intysize; y++)
                {
                    float fx = x * step;
                    float fy = y * step;
                    heights[x][y] = f(fx, fy);
                }
            }
            return Primitives::CreateSurface(heights);
        }
    };
}