Raytracer/Planet.cpp at main · AnanasikDev/Raytracer · GitHub

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#include "template.h"
#include "scene.h"
#include "Noise.h"
#include "PlanetGen.h"
#include "GameGUI.h"
#include "Planet.h"

static inline Material::ID_T GetWater(Level::Outputs& out)
{
	const std::string name = "Water";
	return out.m_self->m_materialManager.GetRandomMaterialVariantR(name).m_index;
};

static inline Material::ID_T GetGrass(Level::Outputs& out)
{
	const std::string name = "Grass";
	return out.m_self->m_materialManager.GetRandomMaterialVariantR(name).m_index;
};

static inline Material::ID_T GetStone(Level::Outputs& out)
{
	const std::string name = "Stone";
	return out.m_self->m_materialManager.GetRandomMaterialVariantR(name).m_index;
};

static inline Material::ID_T GetSnow(Level::Outputs& out)
{
	const std::string name = "Snow";
	return out.m_self->m_materialManager.GetRandomMaterialVariantR(name).m_index;
};

static inline constexpr Material::ID_T GetAir()
{
	return Material::ID_T(0);
};

void Planet::Create(Scene& scene)
{
	Level* planet = scene.AddLevel("Planet");
	const float3 center = 0.5f;
	planet->AddSphere(center, 0.1f, 2);
	planet->AddLightSource(Light(Light::Type::Spot).Intensity(0.4f).Angle(27.f).Softness(0.07f).Radius(0.8f).Position(float3(0)));

	planet->Init([](Level* level)
		{
			level->m_materialManager.New("Air").Color(float3(0, 0, 0)).Use();

			for (int i = 0; i < 1; ++i)
			{
				float3 rgb = float3(Noise::SimpleWhite::GetNext<float>(Noise::Config().MinMax(0.6f, 0.65f)),
									Noise::SimpleWhite::GetNext<float>(Noise::Config().MinMax(0.6f, 0.7f)),
									Noise::SimpleWhite::GetNext<float>(Noise::Config().MinMax(0.78f, 0.99f)));
				level->m_materialManager.New("Water").Color(rgb).Transparency(0.8f).Roughness(0.1f).Reflectivity(0.2f).Density(0.4f).Use();
			}

			for (int i = 0; i < 5; ++i)
			{
				float3 rgb = float3(Noise::SimpleWhite::GetNext<float>(Noise::Config().MinMax(0.4f, 0.55f)));
				level->m_materialManager.New("Stone").Color(rgb).Use();
			}

			for (int i = 0; i < 5; ++i)
			{
				float3 rgb = float3(Noise::SimpleWhite::GetNext<float>(Noise::Config().MinMax(0.4f, 0.7f)),
									Noise::SimpleWhite::GetNext<float>(Noise::Config().MinMax(0.53f, 0.84f)),
									Noise::SimpleWhite::GetNext<float>(Noise::Config().MinMax(0.24f, 0.75f)));
				level->m_materialManager.New("Grass").Color(rgb).Use();
			}

			for (int i = 0; i < 5; ++i)
			{
				float3 rgb = float3(Noise::SimpleWhite::GetNext<float>(Noise::Config().MinMax(0.86f, 0.99f)),
									Noise::SimpleWhite::GetNext<float>(Noise::Config().MinMax(0.89f, 0.99f)),
									Noise::SimpleWhite::GetNext<float>(Noise::Config().MinMax(0.93f, 0.99f)));
				level->m_materialManager.New("Snow").Color(rgb).Reflectivity(0.3f).Roughness(0.4f).Use();
			}
		});

	planet->SetupLazyGenerate([](Level::Inputs /*inputs*/, Level::Outputs& outputs)
	{
		Level::FillBox(outputs, int3(0), int3(WORLDSIZE), [&outputs](int3 /*worldPos*/, int3 /*localPos*/, float3 relPos) -> Material::ID_T
		{
			PlanetGen params = GameGUI::m_planetGen;

			const float3 pos = (relPos - float3(0.5f)) * 2.f;
			const float sqrlen = sqrLength(pos);

			if (sqrlen < 0.01f) return Material::ID_T(1);

			float len = std::sqrtf(sqrlen);
			const float3 dir = pos / len;

			const float baseRadius = params.radius;

			if (len < baseRadius)
			{
				return GetStone(outputs);
			}

			float continents = Noise::Perlin::Get3D(
				dir.x + 100,
				dir.y + 200,
				dir.z + 300,
				Noise::Config().Scale(0.5f).MinMax(0.f, 1.f).Saturation(3.f)
			);

			float mountainMask = Noise::Perlin::Get3D(
				dir.x,
				dir.y,
				dir.z,
				Noise::Config().Scale(params.mountainsFreq).MinMax(0.f, 1.f).Saturation(params.peaks)
			);

			float terrain =
				baseRadius +
				continents * 0.08f +
				mountainMask * params.mountainsFac;

			float detail = Noise::Perlin::Get3D(
				dir.x * 4.f,
				dir.y * 4.f,
				dir.z * 4.f,
				Noise::Config().Scale(params.detail).MinMax(-0.02f, 0.02f)
			);

			terrain += detail;

			float seaLevel = params.seaLevel;

			float latitude = dir.y;

			float coldness = abs(latitude);

			float riverNoise = Noise::Perlin::Get3D(
				dir.x * 3.f + 500,
				dir.y * 3.f + 200,
				dir.z * 3.f + 100,
				Noise::Config().Scale(params.riversFreq).MinMax(0.f, 1.f)
			);

			const float riverWidth = params.riverWidth / 10.f;
			const bool isRiver = (riverNoise > 0.5f - riverWidth && riverNoise < 0.5f + riverWidth) && (terrain > seaLevel) && len <= terrain;
			const bool isMountain = mountainMask > 0.6f;

			if ((len < seaLevel || isRiver) && !isMountain)
				return GetWater(outputs);

			if (len <= terrain)
			{
				if (terrain > params.snow && coldness > 0.4f)
					return GetSnow(outputs);

				if (isMountain)
					return GetStone(outputs);

				return GetGrass(outputs);
			}

			return GetAir();
		});
	});
}