GpuParticles.h

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#pragma once
 
#include "graphics/BlendMode.h"
 
#include <cstdint>
 
namespace eve::graphics {
 
class Texture;
 
enum class GpuParticleFacingMode : std::uint32_t {
    ParticleRotation = 0,
    Velocity         = 1,
    Axis             = 2,
    Ribbon           = 3,
};
 
enum class GpuParticleSortMode : std::uint32_t {
    None     = 0,
    Oldest   = 1,
    Youngest = 2,
    Distance = 3,
    Birth    = 4,
};
 
using GpuParticleHandle = std::uint64_t;
 
inline constexpr GpuParticleHandle kInvalidGpuParticleHandle = 0;
 
struct alignas(16) GpuParticleSpawn {
    float x          = 0.f;
    float y          = 0.f;
    float vx         = 0.f;
    float vy         = 0.f;
    float life       = 0.f;
    float lifetime   = 1.f;
    float size       = 1.f;
    float rotation   = 0.f;
    float spin       = 0.f;
    float frame      = 0.f;
    float radial     = 0.f;
    float tangential = 0.f;
    float ax         = 0.f;
    float ay         = 0.f;
    float noisePhase = 0.f;
    float birthSerial = 0.f;
};
 
static_assert(sizeof(GpuParticleSpawn) == 64, "GPU particle layout must match GLSL std430");
 
struct GpuParticleUpdate {
    float dt             = 0.f;
    float emitterX       = 0.f;
    float emitterY       = 0.f;
    float gravityX       = 0.f;
    float gravityY       = 0.f;
    float damping        = 0.f;
    float velocityLimit  = 0.f;
    float noiseStrength  = 0.f;
    float noiseFrequency = 1.f;
    float noiseSpeed     = 0.f;
    float time           = 0.f;
    float frameRate      = 0.f;
    float localOffsetX   = 0.f;
    float localOffsetY   = 0.f;
};
 
struct GpuParticleDraw {
    Texture*              texture             = nullptr;
    Texture*              sceneDepth          = nullptr;
    BlendMode             blend               = BlendMode::Alpha;
    float                 viewportWidth       = 1.f;
    float                 viewportHeight      = 1.f;
    float                 cameraX             = 0.f;
    float                 cameraY             = 0.f;
    float                 cameraZoom          = 1.f;
    bool                  cameraEnabled       = false;
    float                 particleWidth       = 1.f;
    float                 particleHeight      = 1.f;
    float                 sizeStart           = 1.f;
    float                 sizeEnd             = 1.f;
    float                 stretchFactor       = 1.f;
    GpuParticleFacingMode facing              = GpuParticleFacingMode::ParticleRotation;
    float                 axisRotationRadians = 0.f;
    GpuParticleSortMode   sortMode            = GpuParticleSortMode::None;
    float                 ribbonWidth         = 1.f;
    float                 ribbonMinSegmentLength = 1.f;
    bool                  softParticles       = false;
    float                 particleDepth       = 0.5f;
    float                 softFadeDistance    = 0.05f;
    float                 colorStart[4]       = {1.f, 1.f, 1.f, 1.f};
    float                 colorEnd[4]         = {1.f, 1.f, 1.f, 0.f};
    int                   hframes             = 1;
    int                   vframes             = 1;
};
 
struct GpuParticleStats {
    std::uint32_t alive = 0;
    std::uint32_t instances       = 0;
    std::uint32_t spawned         = 0;
    std::uint32_t killed          = 0;
    std::uint32_t dropped         = 0;
    std::uint64_t submittedFrames = 0;
};
 
}  // namespace eve::graphics