83a1f16806
- BillboardInstance: per-instance uv sub-rect, feet anchor, turn, dithered alpha, flash; BillboardBatch::sharedTexture; Texture createEmpty/update/cellUV/cellAnchor/nearest - SpriteAtlas: fixed-cell runtime atlas with gutters - hd2d::ui: Octopath-style panels, fonts (Cinzel, EB Garamond), dialogue box with typewriter + portraits + choices, menus, nameplates, toasts, ImGui theme - DayCycle (dawn/day/dusk/night keyframes, sun + moon arcs), Weather overcast/mist/ lightning, night-aware presets, stars and moon in the sky - Hidden-window offscreen captures (Window visible=false, Renderer output FBO, OffscreenTarget); --screenshot never opens a window - Camera::worldToScreen; CMake usable via add_subdirectory (HD2D_BUILD_DEMO, HD2D_ENGINE_ASSET_DIR)
87 lines
3.1 KiB
C++
87 lines
3.1 KiB
C++
#pragma once
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#include "hd2d/GL.h"
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#include <glm/glm.hpp>
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#include <random>
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#include <vector>
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namespace hd2d {
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struct PointLight;
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// High-resolution (non pixel-art) particles: ambient fields (fireflies, dust),
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// fire emitters (flames, embers, smoke, glow + flickering light) and bursts.
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class ParticleSystem {
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public:
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// Must match the kind ids in particles.vert / particles.frag.
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enum class Kind : int {
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Firefly = 0, // blinking emissive glow, wanders near the ground
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Mote = 1, // dust speck only visible where sunlight hits it (god rays)
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Spark = 2, // ballistic burst particle (footstep dust, rain splashes, ...)
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Flame = 3, // additive tongue of fire, eroded by noise as it ages
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Ember = 4, // tiny hot spark drifting up on turbulent air
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Smoke = 5, // alpha-blended puff rising above a fire
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Glow = 6, // large soft halo around a fire (one per emitter per frame)
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};
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struct Field { // region that keeps a constant population of ambient particles
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Kind kind;
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glm::vec3 min, max;
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int count;
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};
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struct Fire {
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glm::vec3 pos; // base of the flames
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float scale = 1.0f; // overall size / intensity
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float flameAccum = 0.0f, emberAccum = 0.0f, smokeAccum = 0.0f;
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float flicker = 1.0f; // current light flicker multiplier
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float phase = 0.0f;
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};
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~ParticleSystem();
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void addField(Kind kind, glm::vec3 min, glm::vec3 max, int count);
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int addFire(glm::vec3 pos, float scale = 1.0f);
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void burst(glm::vec3 pos, int count, glm::vec3 color, float speed, float size, float life);
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void update(float dt, float time);
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void draw() const;
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// Appends fire lights first, then up to `maxFireflies` firefly lights.
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void collectLights(std::vector<PointLight>& out, int maxFireflies) const;
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const std::vector<Fire>& fires() const { return fires_; }
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glm::vec3 fireflyColor{2.6f, 3.2f, 0.9f};
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glm::vec3 moteColor{1.0f, 0.95f, 0.8f};
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float fireflyLightRadius = 2.2f;
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glm::vec3 fireLightColor{4.0f, 1.75f, 0.55f};
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float fireLightRadius = 7.0f;
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glm::vec3 wind{0.0f}; // world-space drift applied to smoke and embers
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float ambientFade = 1.0f; // scales fireflies + motes (Weather lowers it in rain / mist)
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float fireflyGlow = 1.0f; // firefly brightness + light (WeatherLook::fireflyGlow, raised at night)
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private:
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struct Particle {
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glm::vec3 pos, vel;
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glm::vec3 color;
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float size, age, life, phase;
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Kind kind;
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int field; // ambient field index, or -1
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int fire; // owning fire, or -1
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};
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struct GpuParticle {
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glm::vec4 posSize;
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glm::vec4 color; // rgb, a = alpha
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glm::vec4 params; // x = kind, y = age / life, z = random seed
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};
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void spawnInField(Particle& p, int fieldIndex, bool randomAge);
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void spawnFire(const Fire& f, int fireIndex, Kind kind);
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std::vector<Field> fields_;
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std::vector<Fire> fires_;
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std::vector<Particle> particles_;
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std::vector<GpuParticle> gpu_;
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std::mt19937 rng_{1337};
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GLuint vao_ = 0, vbo_ = 0;
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size_t capacity_ = 0;
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};
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} // namespace hd2d
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