From 5a6bcd1d42f7498a91316232f70bf2d69fb4df2a Mon Sep 17 00:00:00 2001
From: Thomas Dinges <blender@dingto.org>
Date: Sun, 8 Sep 2013 18:59:39 +0000
Subject: Cycles: * Refactor PathState struct and functions into its own file.

---
 intern/cycles/kernel/kernel_path.h | 114 +------------------------------------
 1 file changed, 1 insertion(+), 113 deletions(-)

(limited to 'intern/cycles/kernel/kernel_path.h')

diff --git a/intern/cycles/kernel/kernel_path.h b/intern/cycles/kernel/kernel_path.h
index 4b1955e8523..b33192a54cd 100644
--- a/intern/cycles/kernel/kernel_path.h
+++ b/intern/cycles/kernel/kernel_path.h
@@ -34,6 +34,7 @@
 #include "kernel_light.h"
 #include "kernel_emission.h"
 #include "kernel_passes.h"
+#include "kernel_path_state.h"
 
 #ifdef __SUBSURFACE__
 #include "kernel_subsurface.h"
@@ -41,119 +42,6 @@
 
 CCL_NAMESPACE_BEGIN
 
-typedef struct PathState {
-	int flag;
-	int bounce;
-
-	int diffuse_bounce;
-	int glossy_bounce;
-	int transmission_bounce;
-	int transparent_bounce;
-} PathState;
-
-__device_inline void path_state_init(PathState *state)
-{
-	state->flag = PATH_RAY_CAMERA|PATH_RAY_SINGULAR|PATH_RAY_MIS_SKIP;
-	state->bounce = 0;
-	state->diffuse_bounce = 0;
-	state->glossy_bounce = 0;
-	state->transmission_bounce = 0;
-	state->transparent_bounce = 0;
-}
-
-__device_inline void path_state_next(KernelGlobals *kg, PathState *state, int label)
-{
-	/* ray through transparent keeps same flags from previous ray and is
-	 * not counted as a regular bounce, transparent has separate max */
-	if(label & LABEL_TRANSPARENT) {
-		state->flag |= PATH_RAY_TRANSPARENT;
-		state->transparent_bounce++;
-
-		if(!kernel_data.integrator.transparent_shadows)
-			state->flag |= PATH_RAY_MIS_SKIP;
-
-		return;
-	}
-
-	state->bounce++;
-
-	/* reflection/transmission */
-	if(label & LABEL_REFLECT) {
-		state->flag |= PATH_RAY_REFLECT;
-		state->flag &= ~(PATH_RAY_TRANSMIT|PATH_RAY_CAMERA|PATH_RAY_TRANSPARENT);
-
-		if(label & LABEL_DIFFUSE)
-			state->diffuse_bounce++;
-		else
-			state->glossy_bounce++;
-	}
-	else {
-		kernel_assert(label & LABEL_TRANSMIT);
-
-		state->flag |= PATH_RAY_TRANSMIT;
-		state->flag &= ~(PATH_RAY_REFLECT|PATH_RAY_CAMERA|PATH_RAY_TRANSPARENT);
-
-		state->transmission_bounce++;
-	}
-
-	/* diffuse/glossy/singular */
-	if(label & LABEL_DIFFUSE) {
-		state->flag |= PATH_RAY_DIFFUSE|PATH_RAY_DIFFUSE_ANCESTOR;
-		state->flag &= ~(PATH_RAY_GLOSSY|PATH_RAY_SINGULAR|PATH_RAY_MIS_SKIP);
-	}
-	else if(label & LABEL_GLOSSY) {
-		state->flag |= PATH_RAY_GLOSSY|PATH_RAY_GLOSSY_ANCESTOR;
-		state->flag &= ~(PATH_RAY_DIFFUSE|PATH_RAY_SINGULAR|PATH_RAY_MIS_SKIP);
-	}
-	else {
-		kernel_assert(label & LABEL_SINGULAR);
-
-		state->flag |= PATH_RAY_GLOSSY|PATH_RAY_SINGULAR|PATH_RAY_MIS_SKIP;
-		state->flag &= ~PATH_RAY_DIFFUSE;
-	}
-}
-
-__device_inline uint path_state_ray_visibility(KernelGlobals *kg, PathState *state)
-{
-	uint flag = state->flag & PATH_RAY_ALL_VISIBILITY;
-
-	/* for visibility, diffuse/glossy are for reflection only */
-	if(flag & PATH_RAY_TRANSMIT)
-		flag &= ~(PATH_RAY_DIFFUSE|PATH_RAY_GLOSSY);
-	/* for camera visibility, use render layer flags */
-	if(flag & PATH_RAY_CAMERA)
-		flag |= kernel_data.integrator.layer_flag;
-
-	return flag;
-}
-
-__device_inline float path_state_terminate_probability(KernelGlobals *kg, PathState *state, const float3 throughput)
-{
-	if(state->flag & PATH_RAY_TRANSPARENT) {
-		/* transparent rays treated separately */
-		if(state->transparent_bounce >= kernel_data.integrator.transparent_max_bounce)
-			return 0.0f;
-		else if(state->transparent_bounce <= kernel_data.integrator.transparent_min_bounce)
-			return 1.0f;
-	}
-	else {
-		/* other rays */
-		if((state->bounce >= kernel_data.integrator.max_bounce) ||
-		   (state->diffuse_bounce >= kernel_data.integrator.max_diffuse_bounce) ||
-		   (state->glossy_bounce >= kernel_data.integrator.max_glossy_bounce) ||
-		   (state->transmission_bounce >= kernel_data.integrator.max_transmission_bounce))
-		{
-			return 0.0f;
-		}
-		else if(state->bounce <= kernel_data.integrator.min_bounce) {
-			return 1.0f;
-		}
-	}
-
-	/* probalistic termination */
-	return average(throughput); /* todo: try using max here */
-}
-
 __device_inline bool shadow_blocked(KernelGlobals *kg, PathState *state, Ray *ray, float3 *shadow)
 {
 	*shadow = make_float3(1.0f, 1.0f, 1.0f);
-- 
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