/*
    Copyright (c) 2005-2020 Intel Corporation

    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.
    You may obtain a copy of the License at

        http://www.apache.org/licenses/LICENSE-2.0

    Unless required by applicable law or agreed to in writing, software
    distributed under the License is distributed on an "AS IS" BASIS,
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    See the License for the specific language governing permissions and
    limitations under the License.
*/

/*
    The original source for this example is
    Copyright (c) 1994-2008 John E. Stone
    All rights reserved.

    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions
    are met:
    1. Redistributions of source code must retain the above copyright
       notice, this list of conditions and the following disclaimer.
    2. Redistributions in binary form must reproduce the above copyright
       notice, this list of conditions and the following disclaimer in the
       documentation and/or other materials provided with the distribution.
    3. The name of the author may not be used to endorse or promote products
       derived from this software without specific prior written permission.

    THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
    OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
    WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
    ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
    DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
    DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
    OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
    HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
    LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
    OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
    SUCH DAMAGE.
*/

/*****************************************************************************
 * api.h - The declarations and prototypes needed so that 3rd party driver   *
 *         code can run the raytracer.  Third party driver code should       * 
 *         only use the functions in this header file to interface with      *
 *         the rendering engine.                                             *
 *************************************************************************** */


/* 
 *  $Id: api.h,v 1.2 2007-02-22 17:54:15 Exp $
 */


/********************************************/
/* Types defined for use with the API calls */
/********************************************/

#ifdef USESINGLEFLT
typedef float apiflt;   /* generic floating point number */
#else
typedef double apiflt;  /* generic floating point number */
#endif

typedef void * SceneHandle;

typedef struct {
  int texturefunc; /* which texture function to use */
  color col;    /* base object color */
  int shadowcast;  /* does the object cast a shadow */
  apiflt ambient;  /* ambient lighting */
  apiflt diffuse;  /* diffuse reflection */
  apiflt specular; /* specular reflection */
  apiflt opacity;  /* how opaque the object is */ 
  vector ctr;   /* origin of texture */
  vector rot;   /* rotation of texture around origin */
  vector scale; /* scale of texture in x,y,z */ 
  vector uaxs;  /* planar map u axis */
  vector vaxs;  /* planar map v axis */
  char imap[96];   /* name of image map */ 
} apitexture;


/*******************************************************************
 *  NOTE: The value passed in apitexture.texturefunc corresponds to 
 *        the meanings given in this table:
 *
 *   0 - No texture function is applied other than standard lighting.
 *   1 - 3D checkerboard texture.  Red & Blue checkers through 3d space.
 *   2 - Grit texture, roughens up the surface of the object a bit.
 *   3 - 3D marble texture.  Makes a 3D swirl pattern through the object.
 *   4 - 3D wood texture.  Makes a 3D wood pattern through the object.
 *   5 - 3D gradient noise function.
 *   6 - I've forgotten :-)
 *   7 - Cylindrical Image Map  **** IMAGE MAPS REQUIRE the filename 
 *   8 - Spherical Image Map         of the image be put in imap[]
 *   9 - Planar Image Map            part of the texture...
 *        planar requires uaxs, and vaxs..
 *
 *******************************************************************/

/********************************************/
/* Functions implemented to provide the API */
/********************************************/

vector rt_vector(apiflt x, apiflt y, apiflt z); /* helper to make vectors */
color  rt_color(apiflt r, apiflt g, apiflt b);  /* helper to make colors */

void rt_initialize();/* reset raytracer, memory deallocation */
void rt_finalize(void); /* close down for good.. */

SceneHandle rt_newscene(void);        /* allocate new scene */
void rt_deletescene(SceneHandle); /* delete a scene */
void rt_renderscene(SceneHandle); /* raytrace the current scene */  
void rt_outputfile(SceneHandle, const char * outname); 
void rt_resolution(SceneHandle, int hres, int vres);
void rt_verbose(SceneHandle, int v);
void rt_rawimage(SceneHandle, unsigned char *rawimage);
void rt_background(SceneHandle, color);

/* Parameter values for rt_boundmode() */
#define RT_BOUNDING_DISABLED 0
#define RT_BOUNDING_ENABLED  1

void rt_boundmode(SceneHandle, int);
void rt_boundthresh(SceneHandle, int);

/* Parameter values for rt_displaymode() */
#define RT_DISPLAY_DISABLED  0
#define RT_DISPLAY_ENABLED   1

void rt_displaymode(SceneHandle, int);

void rt_scenesetup(SceneHandle, char *, int, int, int);
  /* scene, output filename, horizontal resolution, vertical resolution,
            verbose mode */


void rt_camerasetup(SceneHandle, apiflt, apiflt, int, int,
	vector, vector,  vector);
  /* camera parms: scene, zoom, aspectratio, antialiasing, raydepth,
		camera center, view direction, up direction */



void * rt_texture(apitexture *);
   /* pointer to the texture struct that would have been passed to each 
      object() call in older revisions.. */




void rt_light(void * , vector, apiflt);     /* add a light */
  /* light parms: texture, center, radius */ 

void rt_sphere(void *, vector, apiflt);    /* add a sphere */
  /* sphere parms: texture, center, radius */

void rt_scalarvol(void *, vector, vector,
		 int, int, int, char *, void *); 

void rt_extvol(void *, vector, vector, int, apiflt (* evaluator)(apiflt, apiflt, apiflt)); 

void rt_box(void *, vector, vector);  
  /* box parms: texture, min, max */

void rt_plane(void *, vector, vector);  
  /* plane parms: texture, center, normal */

void rt_ring(void *, vector, vector, apiflt, apiflt); 
  /* ring parms: texture, center, normal, inner, outer */

void rt_tri(void *, vector, vector, vector);  
  /* tri parms: texture, vertex 0, vertex 1, vertex 2 */

void rt_stri(void *, vector, vector, vector, 
			vector, vector, vector); 
 /* stri parms: texture, vertex 0, vertex 1, vertex 2, norm 0, norm 1, norm 2 */

void rt_heightfield(void *, vector, int, int, apiflt *, apiflt, apiflt);
  /* field parms: texture, center, m, n, field, wx, wy */

void rt_landscape(void *, int, int, vector,  apiflt, apiflt);

void rt_quadsphere(void *, vector, apiflt); /* add quadric sphere */
  /* sphere parms: texture, center, radius */

void rt_cylinder(void *, vector, vector, apiflt);

void rt_fcylinder(void *, vector, vector, apiflt);

void rt_polycylinder(void *, vector *, int, apiflt);


/* new texture handling routines */
void rt_tex_color(void * voidtex, color col); 

#define RT_PHONG_PLASTIC 0
#define RT_PHONG_METAL   1
void rt_tex_phong(void * voidtex, apiflt phong, apiflt phongexp, int type); 
