strand.h

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/*
 * ***** BEGIN GPL LICENSE BLOCK *****
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
 * All rights reserved.
 *
 * The Original Code is: none of this file.
 *
 * Contributor(s): Brecht Van Lommel.
 *
 * ***** END GPL LICENSE BLOCK *****
 */

#ifndef STRAND_H
#define STRAND_H 

struct StrandVert;
struct StrandRen;
struct StrandBuffer;
struct ShadeSample;
struct StrandPart;
struct Render;
struct RenderPart;
struct RenderBuckets;
struct RenderPrimitiveIterator;
struct ZSpan;
struct ObjectInstanceRen;
struct StrandSurface;
struct DerivedMesh;
struct ObjectRen;

typedef struct StrandPoint {
    /* position within segment */
    float t;

    /* camera space */
    float co[3];
    float nor[3];
    float tan[3];
    float strandco;
    float width;

    /* derivatives */
    float dtco[3], dsco[3];
    float dtstrandco;

    /* outer points */
    float co1[3], co2[3];
    float hoco1[4], hoco2[4];
    float zco1[3], zco2[3];
    int clip1, clip2;

    /* screen space */
    float hoco[4];
    float x, y;

    /* simplification */
    float alpha;
} StrandPoint;

typedef struct StrandSegment {
    struct StrandVert *v[4];
    struct StrandRen *strand;
    struct StrandBuffer *buffer;
    struct ObjectInstanceRen *obi;
    float sqadaptcos;

    StrandPoint point1, point2;
    int shaded;
} StrandSegment;

struct StrandShadeCache;
typedef struct StrandShadeCache StrandShadeCache;

void strand_eval_point(StrandSegment *sseg, StrandPoint *spoint);
void render_strand_segment(struct Render *re, float winmat[][4], struct StrandPart *spart, struct ZSpan *zspan, int totzspan, StrandSegment *sseg);
void strand_minmax(struct StrandRen *strand, float *min, float *max, float width);

struct StrandSurface *cache_strand_surface(struct Render *re, struct ObjectRen *obr, struct DerivedMesh *dm, float mat[][4], int timeoffset);
void free_strand_surface(struct Render *re);

struct StrandShadeCache *strand_shade_cache_create(void);
void strand_shade_cache_free(struct StrandShadeCache *cache);
void strand_shade_segment(struct Render *re, struct StrandShadeCache *cache, struct StrandSegment *sseg, struct ShadeSample *ssamp, float t, float s, int addpassflag);
void strand_shade_unref(struct StrandShadeCache *cache, struct StrandVert *svert);

struct RenderBuckets *init_buckets(struct Render *re);
void add_buckets_primitive(struct RenderBuckets *buckets, float *min, float *max, void *prim);
void free_buckets(struct RenderBuckets *buckets);
void project_hoco_to_bucket(struct RenderBuckets *buckets, float *hoco, float *bucketco);

struct RenderPrimitiveIterator *init_primitive_iterator(struct Render *re, struct RenderBuckets *buckets, struct RenderPart *pa);
void *next_primitive_iterator(struct RenderPrimitiveIterator *iter);
void free_primitive_iterator(struct RenderPrimitiveIterator *iter);

#endif