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146 lines
2.8 KiB
C
146 lines
2.8 KiB
C
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#ifndef FLUID_GRID2_VELOCITY
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#define FLUID_GRID2_vELOCITY
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#include <stdint.h>
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#include "fluid/env/environment.h"
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#define FLUID_GRID2_BOUND_NO_DIR 0
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#define FLUID_GRID2_BOUND_DIR_U 1
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#define FLUID_GRID2_BOUND_DIR_V 2
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#define FLUID_GRID2_BOUND_DIR_W 3
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/**
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* Adds the sources to the destinations
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*/
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void fluid_grid2_addSourceToVectors
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(
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int chunk_mask,
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float ** jru,
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float ** jrv,
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float ** jrw,
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float ** jru0,
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float ** jrv0,
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float ** jrw0,
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float DIFFUSION_CONST,
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float VISCOSITY_CONST,
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float dt);
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/**
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* Sets up a projection system of equations
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* It stores the first derivative of the field in pr, and zeroes out divr.
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* This allows you to calculate the second derivative into divr using the derivative stored in pr.
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* @param ur The x velocity grid
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* @param vr The y velocity grid
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* @param wr The z velocity grid
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* @param pr The grid that will contain the first derivative
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* @param divr The grid that will be zeroed out in preparation of the solver
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* @param DIFFUSION_CONST The diffusion constant
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* @param VISCOSITY_CONST The viscosity constant
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* @param dt The timestep for the simulation
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*/
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void fluid_grid2_setupProjection(
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int chunk_mask,
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float ** ur,
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float ** vr,
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float ** wr,
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float ** pr,
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float ** divr,
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float DIFFUSION_CONST,
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float VISCOSITY_CONST,
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float dt
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);
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/**
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* Solves a projection system of equations.
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* This performs a single iteration across a the p grid to approximate the gradient field.
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* @param jru0 The gradient field
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* @param jrv0 The first derivative field
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*/
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void fluid_grid2_solveProjection(
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int chunk_mask,
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float ** jru,
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float ** jrv,
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float ** jrw,
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float ** jru0,
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float ** jrv0,
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float ** jrw0,
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float DIFFUSION_CONST,
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float VISCOSITY_CONST,
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float dt
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);
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/**
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* Finalizes a projection.
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* This subtracts the difference delta along the approximated gradient field.
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* Thus we are left with an approximately mass-conserved field.
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*/
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void fluid_grid2_finalizeProjection(
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int chunk_mask,
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float ** jru,
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float ** jrv,
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float ** jrw,
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float ** jru0,
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float ** jrv0,
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float ** jrw0,
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float DIFFUSION_CONST,
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float VISCOSITY_CONST,
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float dt
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);
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/*
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* Advects u, v, and w
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*/
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void fluid_grid2_advectVectors(
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int chunk_mask,
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float ** jru,
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float ** jrv,
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float ** jrw,
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float ** jru0,
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float ** jrv0,
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float ** jrw0,
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float DIFFUSION_CONST,
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float VISCOSITY_CONST,
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float dt
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);
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/**
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* Actually performs the advection
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*/
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void fluid_grid2_advect_velocity(uint32_t chunk_mask, int b, float ** jrd, float ** jrd0, float * u, float * v, float * w, float dt);
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/*
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* Solves vector diffusion along all axis
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*/
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void fluid_grid2_solveVectorDiffuse (
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int chunk_mask,
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float ** jru,
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float ** jrv,
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float ** jrw,
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float ** jru0,
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float ** jrv0,
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float ** jrw0,
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float DIFFUSION_CONST,
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float VISCOSITY_CONST,
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float dt
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);
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#endif |