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* G. Ward |
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*/ |
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#ifndef _BSDFREP_H_ |
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#define _BSDFREP_H_ |
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|
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#include "bsdf.h" |
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|
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#define DEBUG 1 |
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#ifdef __cplusplus |
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extern "C" { |
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#endif |
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|
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#ifndef GRIDRES |
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#define GRIDRES 200 /* grid resolution per side */ |
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#define GRIDRES (1<<8) /* grid resolution per side */ |
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#endif |
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/* convert to/from coded radians */ |
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#define ANG2R(r) (int)((r)*((1<<16)/M_PI)) |
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#define R2ANG(c) (((c)+.5)*(M_PI/(1<<16))) |
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|
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typedef struct { |
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float vsum; /* DSF sum */ |
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unsigned short nval; /* number of values in sum */ |
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unsigned short crad; /* radius (coded angle) */ |
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/* moderated cosine factor */ |
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#define COSF(z) (fabs(z)*0.98 + 0.02) |
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|
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typedef union { |
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struct { |
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float v; /* DSF sum */ |
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unsigned int n; /* number of values in sum */ |
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} sum; /* sum for averaging */ |
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float val[2]; /* comparison values */ |
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} GRIDVAL; /* grid value */ |
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typedef struct { |
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float peak; /* lobe value at peak */ |
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C_CHROMA chroma; /* encoded chromaticity */ |
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unsigned short crad; /* radius (coded angle) */ |
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unsigned char gx, gy; /* grid position */ |
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unsigned short gx, gy; /* grid position */ |
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} RBFVAL; /* radial basis function value */ |
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|
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struct s_rbfnode; /* forward declaration of RBF struct */ |
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#define INP_QUAD3 4 /* 180-270 degree quadrant */ |
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#define INP_QUAD4 8 /* 270-360 degree quadrant */ |
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|
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/* name and manufacturer if known */ |
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extern char bsdf_name[]; |
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extern char bsdf_manuf[]; |
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/* active grid resolution */ |
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extern int grid_res; |
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/* coverage/symmetry using INP_QUAD? flags */ |
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extern int input_orient; |
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extern int output_orient; |
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|
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/* represented colorimetry */ |
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typedef enum {RBCphotopic, RBCtristimulus, RBCspectral, RBCunknown} RBColor; |
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|
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extern RBColor rbf_colorimetry; |
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|
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extern const char *RBCident[]; |
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|
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/* log BSDF histogram */ |
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#define HISTLEN 256 |
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#define BSDF2BIG (1./M_PI) |
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#define BSDF2SML 1e-8 |
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#define HISTLNR 17.2759509 /* log(BSDF2BIG/BSDF2SML) */ |
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extern unsigned long bsdf_hist[HISTLEN]; |
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#define histndx(v) (int)(log((v)*(1./BSDF2SML))*(HISTLEN/HISTLNR)) |
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#define histval(i) (exp(((i)+.5)*(HISTLNR/HISTLEN))*BSDF2SML) |
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|
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/* BSDF value for boundary regions */ |
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extern double bsdf_min; |
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extern double bsdf_spec_peak; |
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extern double bsdf_spec_rad; |
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|
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/* processed incident DSF measurements */ |
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extern RBFNODE *dsf_list; |
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#define BSDFREP_FMT "BSDF_RBFmesh" |
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|
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#define BSDFREP_MAGIC 0x5a3c |
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|
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/* global argv[0] */ |
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extern char *progname; |
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|
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/* get theta value in degrees [0,180) range */ |
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#define get_theta180(v) ((180./M_PI)*acos((v)[2])) |
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#define get_theta180(v) ((180./M_PI)*Acos((v)[2])) |
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/* get phi value in degrees, [0,360) range */ |
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#define get_phi360(v) ((180./M_PI)*atan2((v)[1],(v)[0]) + 360.*((v)[1]<0)) |
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|
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/* our loaded grid for this incident angle */ |
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extern double theta_in_deg, phi_in_deg; |
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extern GRIDVAL dsf_grid[GRIDRES][GRIDRES]; |
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extern float (*spec_grid)[GRIDRES][GRIDRES]; |
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extern int nspec_grid; |
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|
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/* Register new input direction */ |
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extern int new_input_direction(double new_theta, double new_phi); |
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/* Reverse symmetry for an RBF distribution */ |
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extern void rev_rbf_symmetry(RBFNODE *rbf, int sym); |
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|
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/* Rotate RBF to correspond to given incident vector */ |
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extern void rotate_rbf(RBFNODE *rbf, const FVECT invec); |
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|
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/* Compute volume associated with Gaussian lobe */ |
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extern double rbf_volume(const RBFVAL *rbfp); |
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|
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/* Compute grid position from normalized input/output vector */ |
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extern void pos_from_vec(int pos[2], const FVECT vec); |
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|
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< |
/* Evaluate RBF for DSF at the given normalized outgoing direction */ |
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> |
/* Evaluate BSDF at the given normalized outgoing direction */ |
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extern double eval_rbfrep(const RBFNODE *rp, const FVECT outvec); |
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|
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extern SDError eval_rbfcol(SDValue *sv, |
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const RBFNODE *rp, const FVECT outvec); |
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|
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/* Insert a new directional scattering function in our global list */ |
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extern int insert_dsf(RBFNODE *newrbf); |
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|
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/* Read a BSDF mesh interpolant from the given binary stream */ |
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extern int load_bsdf_rep(FILE *ifp); |
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|
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/* Set up visible spectrum sampling */ |
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extern void set_spectral_samples(int nspec); |
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|
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/* Start new DSF input grid */ |
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extern void new_bsdf_data(double new_theta, double new_phi); |
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/* Add BSDF data point */ |
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extern void add_bsdf_data(double theta_out, double phi_out, |
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double val, int isDSF); |
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> |
const double val[], int isDSF); |
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|
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/* Count up filled nodes and build RBF representation from current grid */ |
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extern RBFNODE * make_rbfrep(void); |
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/* Find edge(s) for interpolating the given vector, applying symmetry */ |
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extern int get_interp(MIGRATION *miga[3], FVECT invec); |
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|
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/* Return single-lobe specular RBF for the given incident direction */ |
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extern RBFNODE * def_rbf_spec(const FVECT invec); |
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|
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/* Advect and allocate new RBF along edge (internal call) */ |
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extern RBFNODE * e_advect_rbf(const MIGRATION *mig, |
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const FVECT invec, int lobe_lim); |
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|
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/* Compute distance between two RBF lobes (internal call) */ |
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extern double lobe_distance(RBFVAL *rbf1, RBFVAL *rbf2); |
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|
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/* Compute mass transport plan (internal call) */ |
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extern void plan_transport(MIGRATION *mig); |
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|
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/* Partially advect between recorded incident angles and allocate new RBF */ |
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< |
extern RBFNODE * advect_rbf(const FVECT invec); |
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> |
extern RBFNODE * advect_rbf(const FVECT invec, int lobe_lim); |
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> |
|
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> |
#ifdef __cplusplus |
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> |
} |
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> |
#endif |
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> |
#endif /* _BSDFREP_H_ */ |
