moved noise to its own file
This commit is contained in:
Yggdrasil75
313
util/noise/pnoise.cpp
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313
util/noise/pnoise.cpp
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#pragma once
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#include <vector>
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#include <cmath>
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#include <cstring>
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#include <algorithm>
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#include <iostream>
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#include "./pnoise2.hpp"
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#include "../../imgui/imgui.h"
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#include <GLFW/glfw3.h>
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enum class NoiseType {
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Perlin = 0,
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Value = 1,
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Fractal = 2,
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Turbulence = 3,
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Ridged = 4,
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Billow = 5,
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WhiteNoise = 6,
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WorleyNoise = 7,
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VoronoiNoise = 8,
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CrystalNoise = 9,
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DomainWarp = 10,
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CurlNoise = 11
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};
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enum class BlendMode {
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Add = 0,
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Subtract = 1,
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Multiply = 2,
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Min = 3,
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Max = 4,
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Replace = 5,
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DomainWarp = 6
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};
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struct NoiseLayer {
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bool enabled = true;
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char name[32] = "Layer";
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NoiseType type = NoiseType::Perlin;
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BlendMode blend = BlendMode::Add;
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int seedOffset = 0;
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float scale = 0.02f;
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float strength = 1.0f;
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int octaves = 4;
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float persistence = 0.5f;
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float lacunarity = 2.0f;
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float ridgeOffset = 1.0f;
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};
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struct NoisePreviewState {
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int width = 512;
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int height = 512;
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int masterSeed = 1337;
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float offset[2] = {0.0f, 0.0f};
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std::vector<NoiseLayer> layers;
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GLuint textureId = 0;
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std::vector<uint8_t> pixelBuffer;
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bool needsUpdate = true;
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};
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inline float sampleNoiseLayer(PNoise2& gen, NoiseType type, Eigen::Vector2f point, const NoiseLayer& layer) {
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float val = 0.0f;
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switch (type) {
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case NoiseType::Perlin:
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val = gen.permute(point);
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break;
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case NoiseType::Value:
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val = gen.valueNoise(point);
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break;
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case NoiseType::Fractal:
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val = gen.fractalNoise(point, layer.octaves, layer.persistence, layer.lacunarity);
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break;
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case NoiseType::Turbulence:
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val = gen.turbulence(point, layer.octaves);
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val = (val * 2.0f) - 1.0f;
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break;
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case NoiseType::Ridged:
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val = gen.ridgedNoise(point, layer.octaves, layer.ridgeOffset);
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val = (val * 0.5f) - 1.0f;
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break;
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case NoiseType::Billow:
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val = gen.billowNoise(point, layer.octaves);
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val = (val * 2.0f) - 1.0f;
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break;
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case NoiseType::WhiteNoise:
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val = gen.whiteNoise(point);
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break;
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case NoiseType::WorleyNoise:
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val = gen.worleyNoise(point);
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break;
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case NoiseType::VoronoiNoise:
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val = gen.voronoiNoise(point);
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break;
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case NoiseType::CrystalNoise:
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val = gen.crystalNoise(point);
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break;
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case NoiseType::DomainWarp:
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val = gen.domainWarp(point, 1.0f);
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break;
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case NoiseType::CurlNoise:
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Eigen::Vector2f flow = gen.curlNoise(point);
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val = flow.norm();
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break;
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}
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return val;
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}
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inline void updateNoiseTexture(NoisePreviewState& state) {
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if (state.textureId == 0) glGenTextures(1, &state.textureId);
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state.pixelBuffer.resize(state.width * state.height * 3);
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#pragma omp parallel for
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for (int y = 0; y < state.height; ++y) {
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PNoise2 generator(state.masterSeed);
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for (int x = 0; x < state.width; ++x) {
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// 1. Initial Coordinate
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float nx = (x + state.offset[0]);
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float ny = (y + state.offset[1]);
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Eigen::Vector2f point(nx, ny);
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float finalValue = 0.0f;
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// 2. Process Layer Stack
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for (const auto& layer : state.layers) {
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if (!layer.enabled) continue;
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// Adjust coordinate frequency for this layer
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Eigen::Vector2f samplePoint = point * layer.scale;
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// Cheat seed offset
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samplePoint += Eigen::Vector2f((float)layer.seedOffset * 10.5f, (float)layer.seedOffset * -10.5f);
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// Special Case: Coordinate Mutators
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if (layer.blend == BlendMode::DomainWarp) {
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if (layer.type == NoiseType::CurlNoise) {
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Eigen::Vector2f flow = generator.curlNoise(samplePoint);
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point += flow * layer.strength * 100.0f;
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} else {
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float warpX = sampleNoiseLayer(generator, layer.type, samplePoint, layer);
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float warpY = sampleNoiseLayer(generator, layer.type, samplePoint + Eigen::Vector2f(5.2f, 1.3f), layer);
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point += Eigen::Vector2f(warpX, warpY) * layer.strength * 100.0f;
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}
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continue;
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}
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// Standard Arithmetic Layers
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float nVal = sampleNoiseLayer(generator, layer.type, samplePoint, layer);
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switch (layer.blend) {
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case BlendMode::Replace:
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finalValue = nVal * layer.strength;
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break;
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case BlendMode::Add:
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finalValue += nVal * layer.strength;
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break;
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case BlendMode::Subtract:
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finalValue -= nVal * layer.strength;
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break;
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case BlendMode::Multiply:
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finalValue *= (nVal * layer.strength);
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break;
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case BlendMode::Max:
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finalValue = std::max(finalValue, nVal * layer.strength);
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break;
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case BlendMode::Min:
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finalValue = std::min(finalValue, nVal * layer.strength);
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break;
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}
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}
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// 3. Normalize for display
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float norm = std::tanh(finalValue);
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norm = (norm + 1.0f) * 0.5f;
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norm = std::clamp(norm, 0.0f, 1.0f);
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uint8_t color = static_cast<uint8_t>(norm * 255);
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int idx = (y * state.width + x) * 3;
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state.pixelBuffer[idx] = color;
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state.pixelBuffer[idx+1] = color;
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state.pixelBuffer[idx+2] = color;
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}
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}
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glBindTexture(GL_TEXTURE_2D, state.textureId);
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glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
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glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, state.width, state.height,
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0, GL_RGB, GL_UNSIGNED_BYTE, state.pixelBuffer.data());
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
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state.needsUpdate = false;
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}
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inline void drawNoiseLab(NoisePreviewState& noiseState) {
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ImGui::Begin("2D Noise Lab");
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// Master Controls
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bool changed = false;
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changed |= ImGui::InputInt("Master Seed", &noiseState.masterSeed);
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changed |= ImGui::DragFloat2("Pan Offset", noiseState.offset, 1.0f);
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ImGui::Separator();
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if (ImGui::Button("Add Layer")) {
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NoiseLayer l;
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sprintf(l.name, "Layer %zu", noiseState.layers.size());
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noiseState.layers.push_back(l);
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changed = true;
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}
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ImGui::SameLine();
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if (ImGui::Button("Clear All")) {
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noiseState.layers.clear();
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changed = true;
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}
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ImGui::BeginChild("LayersScroll", ImVec2(0, 300), true);
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// Layer List
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for (int i = 0; i < noiseState.layers.size(); ++i) {
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NoiseLayer& layer = noiseState.layers[i];
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ImGui::PushID(i);
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// Header
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bool open = ImGui::CollapsingHeader(layer.name, ImGuiTreeNodeFlags_DefaultOpen);
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// Context menu to move/delete
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if (ImGui::BeginPopupContextItem()) {
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if (ImGui::MenuItem("Move Up", nullptr, false, i > 0)) {
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std::swap(noiseState.layers[i], noiseState.layers[i-1]);
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changed = true;
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ImGui::CloseCurrentPopup();
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}
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if (ImGui::MenuItem("Move Down", nullptr, false, i < noiseState.layers.size()-1)) {
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std::swap(noiseState.layers[i], noiseState.layers[i+1]);
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changed = true;
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ImGui::CloseCurrentPopup();
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}
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if (ImGui::MenuItem("Duplicate")) {
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noiseState.layers.insert(noiseState.layers.begin() + i, layer);
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changed = true;
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ImGui::CloseCurrentPopup();
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}
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if (ImGui::MenuItem("Delete")) {
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noiseState.layers.erase(noiseState.layers.begin() + i);
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changed = true;
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ImGui::CloseCurrentPopup();
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ImGui::EndPopup();
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ImGui::PopID();
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continue;
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}
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ImGui::EndPopup();
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}
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if (open) {
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ImGui::Checkbox("##enabled", &layer.enabled);
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ImGui::SameLine();
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ImGui::InputText("##name", layer.name, 32);
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// Type and Blend
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const char* types[] = { "Perlin", "Value", "Fractal", "Turbulence", "Ridged", "Billow", "White", "Worley", "Voronoi", "Crystal", "Domain Warp", "Curl" };
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const char* blends[] = { "Add", "Subtract", "Multiply", "Min", "Max", "Replace", "Domain Warp (Coord)" };
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if (ImGui::Combo("Type", (int*)&layer.type, types, IM_ARRAYSIZE(types))) changed = true;
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if (ImGui::Combo("Blend", (int*)&layer.blend, blends, IM_ARRAYSIZE(blends))) changed = true;
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// Common Params
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if (ImGui::SliderFloat("Scale", &layer.scale, 0.0001f, 0.2f, "%.5f")) changed = true;
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if (ImGui::SliderFloat("Strength/Weight", &layer.strength, 0.0f, 5.0f)) changed = true;
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if (ImGui::SliderInt("Seed Offset", &layer.seedOffset, 0, 100)) changed = true;
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// Conditional Params
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if (layer.type == NoiseType::Fractal || layer.type == NoiseType::Turbulence ||
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layer.type == NoiseType::Ridged || layer.type == NoiseType::Billow) {
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if (ImGui::SliderInt("Octaves", &layer.octaves, 1, 10)) changed = true;
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if (layer.type == NoiseType::Fractal) {
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if (ImGui::SliderFloat("Persistence", &layer.persistence, 0.0f, 1.0f)) changed = true;
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if (ImGui::SliderFloat("Lacunarity", &layer.lacunarity, 1.0f, 4.0f)) changed = true;
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}
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if (layer.type == NoiseType::Ridged) {
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if (ImGui::SliderFloat("Ridge Offset", &layer.ridgeOffset, 0.0f, 2.0f)) changed = true;
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}
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}
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ImGui::Separator();
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}
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ImGui::PopID();
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}
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ImGui::EndChild();
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ImGui::Separator();
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// Preview
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ImGui::Text("Preview Output");
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ImGui::Image((void*)(intptr_t)noiseState.textureId, ImVec2((float)noiseState.width, (float)noiseState.height));
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// Auto update logic
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if (changed || noiseState.needsUpdate) {
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updateNoiseTexture(noiseState);
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}
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ImGui::End();
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}
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