Raytrace modifications from the Render Branch.

These should not have any effect on render results, except in some cases with
you have overlapping faces, where the noise seems to be slightly reduced.

There are some performance improvements, for simple scenes I wouldn't expect
more than 5-10% to be cut off the render time, for sintel scenes we got about
50% on average, that's with millions of polygons on intel quad cores. This
because memory access / cache misses were the main bottleneck for those scenes,
and the optimizations improve that.

Interal changes:

* Remove RE_raytrace.h, raytracer is now only used by render engine again.
* Split non-public parts rayobject.h into rayobject_internal.h, hopefully
 makes it clearer how the API is used.
* Added rayintersection.h to contain some of the stuff from RE_raytrace.h
* Change Isect.vec/labda to Isect.dir/dist, previously vec was sometimes
  normalized and sometimes not, confusing... now dir is always normalized
  and dist contains the distance.
* Change VECCOPY and similar to BLI_math functions.
* Force inlining of auxiliary functions for ray-triangle/quad intersection,
  helps a few percentages.
* Reorganize svbvh code so all the traversal functions are in one file
* Don't do test for root so that push_childs can be inlined
* Make shadow a template parameter so it doesn't need to be runtime checked
* Optimization in raytree building, was computing bounding boxes more often
  than necessary.
* Leave out logf() factor in SAH, makes tree build quicker with no
  noticeable influence on raytracing on performance?
* Set max childs to 4, simplifies traversal code a bit, but also seems
  to help slightly in general.
* Store child pointers and child bb just as fixed arrays of size 4 in nodes,
  nearly all nodes have this many children, so overall it actually reduces
  memory usage a bit and avoids a pointer indirection.

2 files changed, 0 insertions, 218 deletions

diff --git a/source/blender/render/extern/include/RE_raytrace.h b/source/blender/render/extern/include/RE_raytrace.h
deleted file mode 100644
index cf463c0795e..00000000000
--- a/source/blender/render/extern/include/RE_raytrace.h
+++ /dev/null
@@ -1,217 +0,0 @@
-/**
- * $Id$
- *
- * ***** 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) 2007 Blender Foundation.
- * All rights reserved.
- *
- * The Original Code is: all of this file.
- *
- * Contributor(s): André Pinto.
- *
- * ***** END GPL LICENSE BLOCK *****
- * RE_raytrace.h: ray tracing api, can be used independently from the renderer. 
- */
-
-#ifndef RE_RAYTRACE_H
-#define RE_RAYTRACE_H
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-// #define RE_RAYCOUNTER			/* enable counters per ray, usefull for measuring raytrace structures performance */
-
-#define RE_RAY_LCTS_MAX_SIZE	256
-#define RT_USE_LAST_HIT			/* last shadow hit is reused before raycasting on whole tree */
-//#define RT_USE_HINT			/* last hit object is reused before raycasting on whole tree */
-
-#ifdef RE_RAYCOUNTER
-
-typedef struct RayCounter RayCounter;
-struct RayCounter
-{
-
-	struct
-	{
-		unsigned long long test, hit;
-		
-	} faces, bb, simd_bb, raycast, raytrace_hint, rayshadow_last_hit;
-};
-#endif
-
-/* Internals about raycasting structures can be found on intern/raytree.h */
-typedef struct RayObject RayObject;
-typedef struct Isect Isect;
-typedef struct RayHint RayHint;
-typedef struct RayTraceHint RayTraceHint;
-
-struct DerivedMesh;
-struct Mesh;
-struct VlakRen;
-struct ObjectInstanceRen;
-
-int  RE_rayobject_raycast(RayObject *r, Isect *i);
-void RE_rayobject_add    (RayObject *r, RayObject *);
-void RE_rayobject_done(RayObject *r);
-void RE_rayobject_free(RayObject *r);
-
-/* Extend min/max coords so that the rayobject is inside them */
-void RE_rayobject_merge_bb(RayObject *ob, float *min, float *max);
-
-/* initializes an hint for optiming raycast where it is know that a ray will pass by the given BB often the origin point */
-void RE_rayobject_hint_bb(RayObject *r, RayHint *hint, float *min, float *max);
-
-/* initializes an hint for optiming raycast where it is know that a ray will be contained inside the given cone*/
-/* void RE_rayobject_hint_cone(RayObject *r, RayHint *hint, float *); */
-
-/* RayObject constructors */
-RayObject* RE_rayobject_octree_create(int ocres, int size);
-RayObject* RE_rayobject_instance_create(RayObject *target, float transform[][4], void *ob, void *target_ob);
-RayObject* RE_rayobject_empty_create(void);
-
-RayObject* RE_rayobject_blibvh_create(int size);	/* BLI_kdopbvh.c   */
-RayObject* RE_rayobject_vbvh_create(int size);		/* raytrace/rayobject_vbvh.c */
-RayObject* RE_rayobject_svbvh_create(int size);		/* raytrace/rayobject_svbvh.c */
-RayObject* RE_rayobject_qbvh_create(int size);		/* raytrace/rayobject_qbvh.c */
-
-
-/*
- * This ray object represents a triangle or a quad face.
- * All data needed to realize intersection is "localy" available.
- */
-typedef struct RayFace
-{
-	float v1[4], v2[4], v3[4], v4[3];
-	int quad;
-	void *ob;
-	void *face;
-	
-} RayFace;
-
-#define RE_rayface_isQuad(a) ((a)->quad)
-
-RayObject* RE_rayface_from_vlak(RayFace *face, struct ObjectInstanceRen *obi, struct VlakRen *vlr);
-RayObject* RE_rayface_from_coords(RayFace *rayface, void *ob, void *face, float *co1, float *co2, float *co3, float *co4);
-
-
-/*
- * This ray object represents faces directly from a given VlakRen structure.
- * Thus allowing to save memory, but making code triangle intersection dependant on render structures
- */
-typedef struct VlakPrimitive
-{
-	struct ObjectInstanceRen *ob;
-	struct VlakRen *face;
-} VlakPrimitive;
-
-RayObject* RE_vlakprimitive_from_vlak(VlakPrimitive *face, struct ObjectInstanceRen *obi, struct VlakRen *vlr);
-
-
-
-/*
- * Raytrace hints
- */
-typedef struct LCTSHint LCTSHint;
-struct LCTSHint
-{
-	int size;
-	RayObject *stack[RE_RAY_LCTS_MAX_SIZE];
-};
-
-struct RayHint
-{
-	union
-	{
-		LCTSHint lcts;
-	} data;
-};
-
-
-/* Ray Intersection */
-struct Isect
-{
-	float start[3];
-	float vec[3];
-	float labda;
-
-	/* length of vec, configured by RE_rayobject_raycast */
-	int   bv_index[6];
-	float idot_axis[3];
-	float dist;
-
-/*	float end[3];			 - not used */
-
-	float u, v;
-	
-	struct
-	{
-		void *ob;
-		void *face;
-	}
-	hit, orig;
-	
-	RayObject *last_hit;	/* last hit optimization */
-
-#ifdef RT_USE_HINT
-	RayTraceHint *hint, *hit_hint;
-#endif
-	
-	short isect;			/* which half of quad */
-	short mode;				/* RE_RAY_SHADOW, RE_RAY_MIRROR, RE_RAY_SHADOW_TRA */
-	int lay;				/* -1 default, set for layer lamps */
-	
-	int skip;				/* RE_SKIP_CULLFACE */
-	int check;
-
-	float col[4];			/* RGBA for shadow_tra */
-
-	void *userdata;
-	
-	RayHint *hint;
-	
-#ifdef RE_RAYCOUNTER
-	RayCounter *raycounter;
-#endif
-};
-
-/* ray types */
-#define RE_RAY_SHADOW 0
-#define RE_RAY_MIRROR 1
-#define RE_RAY_SHADOW_TRA 2
-
-/* skip options */
-#define RE_SKIP_CULLFACE				(1 << 0)
-/* if using this flag then *face should be a pointer to a VlakRen */
-#define RE_SKIP_VLR_NEIGHBOUR			(1 << 1)
-
-/* check options */
-#define RE_CHECK_VLR_NONE				0
-#define RE_CHECK_VLR_RENDER				1
-#define RE_CHECK_VLR_NON_SOLID_MATERIAL	2
-#define RE_CHECK_VLR_BAKE				3
-
-/* TODO use: FLT_MAX? */
-#define RE_RAYTRACE_MAXDIST	1e33
-
-#ifdef __cplusplus
-}
-#endif
-
-
-#endif /*__RE_RAYTRACE_H__*/
diff --git a/source/blender/render/extern/include/RE_shader_ext.h b/source/blender/render/extern/include/RE_shader_ext.h
index 26e34a741f7..2b451810e37 100644
--- a/source/blender/render/extern/include/RE_shader_ext.h
+++ b/source/blender/render/extern/include/RE_shader_ext.h
@@ -30,7 +30,6 @@
 #ifndef RE_SHADER_EXT_H
 #define RE_SHADER_EXT_H
 
-#include "RE_raytrace.h" /* For RE_RAYCOUNTER */
 /* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
 /* this include is for shading and texture exports            */
 /* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */