DtWaterOnScreenDefines.h

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/******************************************************************************
** Copyright (c) 2020 MAK Technologies, Inc.
** All rights reserved.
******************************************************************************/

#pragma once

// The rate at which splash effects move down the screen.
#define SPLASH_MOTION_RATE       0.05f
// Number of splash particles to add per frame.
#define SPLASHES_PER_FRAME       1
// The largest mass of a raindrop allowed; use to prevent overly
// large drops when they merge
#define MAXIMUM_MERGED_MASS      0.2f
// Influences the overall rate of new raindrops, which is further
// modulated by the wind speed, wind direction, and precipitation
// intensity.
#define MAX_PARTICLES_PER_SECOND 10.0f
// The maximum simulated wind speed
#define MAX_WIND_SPEED           100.0f
// Projected size of the screen. Influences the overall size of drops
#define SCREEN_SIZE_MM           50.0f
// Weight in mg at which a non-moving drop will start moving.
#define STATIC_CRITICAL_WEIGHT   0.15f
// Weight in mg required for a moving drop to keep moving.
#define DYNAMIC_CRITICAL_WEIGHT  0.08f
// Minimum mass in mg used when computing residual drops
#define MINIMUM_MASS             0.001f
// Maximum mass in mg used when creating new drops
#define MAXIMUM_MASS             0.1f
// Influences the amount of water left behind as a drop moves
#define W2                       0.1f
// Acceleration of a drop moving over a wet surface
#define ACCELERATION_DRY         0.04f
// Acceleration of a drop moving over a dry surface
#define ACCELERATION_WET         0.05f
// Deceleration of a moving drop that has fallen below critical mass
#define DECELERATION_DRY         0.04f
// Rate of evaporation in mg/sec, used to ensure particles go away eventually
#define EVAPORATION_RATE         0.001f
// Texel dimension of our precomputed raindrop normal map
#define PRECOMPUTED_DIM          256
// Minimum mass of a splash particle when entering ocean waves
#define MINIMUM_SPLASH_MASS      100.0f
// Maximum mass of a splash particle when entering ocean waves
#define MAXIMUM_SPLASH_MASS      5000.0f
// Local random maximum for custom random number generator
#define LOCAL_RAND_MAX           0x7FFF
// The minimum height above water at which splash effects kick in.
#define MINIMUM_SPLASH_ZONE 0.3f
// The wave height multiple at which spray effects kick in.
#define SPRAY_HEIGHT 2.0f

// The dimension of the grid used to divide the screen into discrete
// locations for water drops.
#define GRID_DIMENSION 200
// The texture size of the normal map used for post processing. This has
// a big impact on performance, so don't make it bigger than necessary.
// Having it kind of low is also useful for blurring the drops a bit and
// giving a cheap depth of field effect on them.
#define TEXSIZE 768