d63da45ca8
two separate files, raytrace.c and rayshade.c. The tracing code can now be used separately from the renderer (will be used in a later commit), and the raytracing acceleration structure can now also be easily replaced, if someone wants to experiment with that.
91 lines
2.8 KiB
C
91 lines
2.8 KiB
C
/**
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* $Id$
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*
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* ***** BEGIN GPL LICENSE BLOCK *****
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* The Original Code is Copyright (C) 2007 Blender Foundation.
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* All rights reserved.
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*
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* The Original Code is: all of this file.
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*
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* Contributor(s): none yet.
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*
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* ***** END GPL LICENSE BLOCK *****
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* RE_raytrace.h: ray tracing api, can be used independently from the renderer.
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*/
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#ifndef RE_RAYTRACE_H
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#define RE_RAYTRACE_H
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/* ray types */
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#define RE_RAY_SHADOW 0
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#define RE_RAY_MIRROR 1
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#define RE_RAY_SHADOW_TRA 2
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/* spatial tree for raytracing acceleration */
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typedef void RayTree;
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/* abstraction of face type */
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typedef void RayFace;
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/* struct for intersection data */
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typedef struct Isect {
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float start[3]; /* start+vec = end, in ray_tree_intersect */
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float vec[3];
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float end[3];
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float labda, u, v; /* distance to hitpoint, uv weights */
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RayFace *face; /* face is where to intersect with */
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RayFace *faceorig; /* start face */
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RayFace *face_last; /* for shadow optimize, last intersected face */
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short isect; /* which half of quad */
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short mode; /* RE_RAYSHADOW, RE_RAYMIRROR, RE_RAYSHADOW_TRA */
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int lay; /* -1 default, set for layer lamps */
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/* only used externally */
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float col[4]; /* RGBA for shadow_tra */
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/* octree only */
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RayFace *facecontr;
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float ddalabda;
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short faceisect; /* flag if facecontr was done or not */
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} Isect;
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/* function callbacks for face type abstraction */
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typedef void (*RayCoordsFunc)(RayFace *face,
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float **v1, float **v2, float **v3, float **v4);
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typedef int (*RayCheckFunc)(Isect *is, RayFace *face);
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/* tree building and freeing */
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RayTree *RE_ray_tree_create(int ocres, int totface, float *min, float *max,
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RayCoordsFunc coordfunc, RayCheckFunc checkfunc);
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void RE_ray_tree_add_face(RayTree *tree, RayFace *face);
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void RE_ray_tree_done(RayTree *tree);
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void RE_ray_tree_free(RayTree *tree);
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/* intersection with full tree and single face */
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int RE_ray_tree_intersect(RayTree *tree, Isect *is);
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int RE_ray_face_intersection(Isect *is, RayCoordsFunc coordsfunc);
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/* retrieve the diameter of the tree structure, for setting intersection
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end distance */
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float RE_ray_tree_max_size(RayTree *tree);
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#endif /*__RE_RAYTRACE_H__*/
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