101 lines
3 KiB
C
101 lines
3 KiB
C
|
// Copyright 2005 Mitsubishi Electric Research Laboratories All Rights Reserved.
|
||
|
|
|
||
|
|
// Permission to use, copy and modify this software and its documentation without
|
||
|
|
// fee for educational, research and non-profit purposes, is hereby granted, provided
|
||
|
|
// that the above copyright notice and the following three paragraphs appear in all copies.
|
||
|
|
|
||
|
|
// To request permission to incorporate this software into commercial products contact:
|
||
|
|
// Vice President of Marketing and Business Development;
|
||
|
|
// Mitsubishi Electric Research Laboratories (MERL), 201 Broadway, Cambridge, MA 02139 or
|
||
|
|
// <license@merl.com>.
|
||
|
|
|
||
|
|
// IN NO EVENT SHALL MERL BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL,
|
||
|
|
// OR CONSEQUENTIAL DAMAGES, INCLUDING LOST PROFITS, ARISING OUT OF THE USE OF THIS SOFTWARE AND
|
||
|
|
// ITS DOCUMENTATION, EVEN IF MERL HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
|
||
|
|
|
||
|
|
// MERL SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
|
||
|
|
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED
|
||
|
|
// HEREUNDER IS ON AN "AS IS" BASIS, AND MERL HAS NO OBLIGATIONS TO PROVIDE MAINTENANCE, SUPPORT,
|
||
|
|
// UPDATES, ENHANCEMENTS OR MODIFICATIONS.
|
||
|
|
|
||
|
|
// The Implementation has been moved to "brdfread.cpp" for compatibility
|
||
|
|
#ifndef BRDFREAD_H
|
||
|
|
#define BRDFREAD_H
|
||
|
|
|
||
|
|
#include <cmath>
|
||
|
|
#include <common/color.h>
|
||
|
|
#include <cstdlib>
|
||
|
|
#include <iostream>
|
||
|
|
|
||
|
|
#define BRDF_SAMPLING_RES_THETA_H 90
|
||
|
|
#define BRDF_SAMPLING_RES_THETA_D 90
|
||
|
|
#define BRDF_SAMPLING_RES_PHI_D 360
|
||
|
|
|
||
|
|
#define RED_SCALE (1.0 / 1500.0)
|
||
|
|
#define GREEN_SCALE (1.15 / 1500.0)
|
||
|
|
#define BLUE_SCALE (1.66 / 1500.0)
|
||
|
|
#ifndef M_PI
|
||
|
|
#define M_PI 3.1415926535897932384626433832795
|
||
|
|
#endif
|
||
|
|
|
||
|
|
class BRDFRead {
|
||
|
|
public:
|
||
|
|
BRDFRead(const char *filename);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Given a pair of incoming/outgoing angles, look up the BRDF.
|
||
|
|
*/
|
||
|
|
Color lookupBrdfValues(double theta_in, double phi_in, double theta_out, double phi_out);
|
||
|
|
|
||
|
|
private:
|
||
|
|
/**
|
||
|
|
* Read BRDF data
|
||
|
|
*/
|
||
|
|
bool readBrdf(const char *filename);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* cross product of two vectors
|
||
|
|
*/
|
||
|
|
void cross_product(double *v1, double *v2, double *out);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* normalize vector
|
||
|
|
*/
|
||
|
|
void normalize(double *v);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* rotate vector along one axis
|
||
|
|
*/
|
||
|
|
void rotate_vector(double *vector, double *axis, double angle, double *out);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* convert standard coordinates to half vector/difference vector coordinates
|
||
|
|
*/
|
||
|
|
void std_coords_to_half_diff_coords(double theta_in, double phi_in, double theta_out, double phi_out,
|
||
|
|
double &theta_half, double &phi_half, double &theta_diff, double &phi_diff);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Lookup theta_half index
|
||
|
|
* This is a non-linear mapping!
|
||
|
|
* In: [0 .. pi/2]
|
||
|
|
* Out: [0 .. 89]
|
||
|
|
*/
|
||
|
|
inline int theta_half_index(double theta_half);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Lookup theta_diff index
|
||
|
|
* In: [0 .. pi/2]
|
||
|
|
* Out: [0 .. 89]
|
||
|
|
*/
|
||
|
|
inline int theta_diff_index(double theta_diff);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Lookup phi_diff index
|
||
|
|
*/
|
||
|
|
inline int phi_diff_index(double phi_diff);
|
||
|
|
|
||
|
|
double *brdfData;
|
||
|
|
};
|
||
|
|
|
||
|
|
#endif
|