* QMC Raytracing

This introduces QMC sampling for use in glossy reflections/refractions, soft raytraced shadows, and ambient occlusion.

This work includes many new features and speed-ups, so check out the nice docs here:

Glossy Reflection/Refraction
http://www.blender.org/development/current-projects/changes-since-244/glossy-reflectionrefraction/

Raytraced Soft Shadows
http://www.blender.org/development/current-projects/changes-since-244/raytraced-soft-shadows/

QMC Sampling
http://www.blender.org/development/current-projects/changes-since-244/qmc-sampling/

Many thanks to Brecht van Lommel for some initial code snippets and for reviewing the patch, and especially to Alfredo de Greef who gave me a lot of guidance and help along the way!

2 files changed, 22 insertions, 3 deletions

diff --git a/source/blender/render/intern/include/render_types.h b/source/blender/render/intern/include/render_types.h
index 5c2e788ce44..b6d1024a081 100644
--- a/source/blender/render/intern/include/render_types.h
+++ b/source/blender/render/intern/include/render_types.h
@@ -59,6 +59,18 @@ typedef struct SampleTables
 	
 } SampleTables;
 
+typedef struct QMCSampler
+{
+	int type;
+	int tot;
+	double *samp2d;
+	double offs[BLENDER_MAX_THREADS][2];
+} QMCSampler;
+
+#define SAMP_TYPE_JITTERED		0
+#define SAMP_TYPE_HALTON		1
+#define SAMP_TYPE_HAMMERSLEY	2
+
 /* this is handed over to threaded hiding/passes/shading engine */
 typedef struct RenderPart
 {
@@ -130,6 +142,7 @@ struct Render
 	/* samples */
 	SampleTables *samples;
 	float jit[32][2];
+	QMCSampler *qsa;
 	
 	/* scene, and its full copy of renderdata and world */
 	Scene *scene;
@@ -335,12 +348,14 @@ typedef struct LampRen {
 	/** A small depth offset to prevent self-shadowing. */
 	float bias;
 	
-	short ray_samp, ray_sampy, ray_sampz, ray_samp_type, area_shape, ray_totsamp;
+	short ray_samp, ray_sampy, ray_sampz, ray_samp_method, ray_samp_type, area_shape, ray_totsamp;
 	short xold[BLENDER_MAX_THREADS], yold[BLENDER_MAX_THREADS];	/* last jitter table for area lights */
 	float area_size, area_sizey, area_sizez;
-	
+	float adapt_thresh;
+		
 	struct ShadBuf *shb;
 	float *jitter;
+	QMCSampler *qsa;
 	
 	float imat[3][3];
 	float spottexfac;
@@ -351,7 +366,7 @@ typedef struct LampRen {
 	
 	/* passes & node shader support: all shadow info for a pixel */
 	LampShadowSample *shadsamp;
-	
+		
 	/* yafray: photonlight params */
 	int YF_numphotons, YF_numsearch;
 	short YF_phdepth, YF_useqmc, YF_bufsize;
diff --git a/source/blender/render/intern/include/rendercore.h b/source/blender/render/intern/include/rendercore.h
index 3e3c49e87d0..0d807d56180 100644
--- a/source/blender/render/intern/include/rendercore.h
+++ b/source/blender/render/intern/include/rendercore.h
@@ -99,6 +99,10 @@ extern void ray_trace(ShadeInput *, ShadeResult *);
 extern void ray_ao(ShadeInput *, float *);
 extern void init_jitter_plane(LampRen *lar);
 extern void init_ao_sphere(struct World *wrld);
+extern void init_lamp_hammersley(LampRen *lar);
+extern void free_lamp_qmcsampler(LampRen *lar);
+extern void init_render_hammersley(Render *re);
+extern void free_render_qmcsampler(Render *re);
 
 #endif /* RENDER_EXT_H */