From 4f3e0b7709bb64ffc24f2a003509d5f480848239 Mon Sep 17 00:00:00 2001
From: Anthony LaTorre <tlatorre9@gmail.com>
Date: Tue, 9 Aug 2011 16:39:40 -0400
Subject: switch to indexing child nodes by start and stop indices instead of
 start and length; this reduces a bit of arithmetic when traversing the
 bounding volume hierarchy and makes the code in Geometry.build() more
 concise. add an untested cuda kernel to interleave the bits in three uint64
 arrays.

---
 src/alpha.h | 38 +++++++++++++++++++-------------------
 1 file changed, 19 insertions(+), 19 deletions(-)

(limited to 'src/alpha.h')

diff --git a/src/alpha.h b/src/alpha.h
index 5e3e803..a9963eb 100644
--- a/src/alpha.h
+++ b/src/alpha.h
@@ -17,14 +17,14 @@ __device__ void swap(T &a, T &b)
 
 struct HitList
 {
-	int size;
-	int indices[ALPHA_DEPTH];
+	unsigned int size;
+	unsigned int indices[ALPHA_DEPTH];
 	float distances[ALPHA_DEPTH];
 };
 
 __device__ void add_to_hit_list(const float &distance, const int &index, HitList &h)
 {
-	int i;
+	unsigned int i;
 	if (h.size >= ALPHA_DEPTH)
 	{
 		if (distance > h.distances[ALPHA_DEPTH-1])
@@ -50,7 +50,7 @@ __device__ void add_to_hit_list(const float &distance, const int &index, HitList
 	}
 }
 
-__device__ __noinline__ int get_color_alpha(const float3 &origin, const float3& direction)
+__device__ int get_color_alpha(const float3 &origin, const float3& direction)
 {
 	HitList h;
 	h.size = 0;
@@ -60,34 +60,34 @@ __device__ __noinline__ int get_color_alpha(const float3 &origin, const float3&
 	if (!intersect_node(origin, direction, g_start_node))
 		return 0;
 
-	int stack[STACK_SIZE];
+	unsigned int stack[STACK_SIZE];
 
-	int *head = &stack[0];
-	int *node = &stack[1];
-	int *tail = &stack[STACK_SIZE-1];
+	unsigned int *head = &stack[0];
+	unsigned int *node = &stack[1];
+	unsigned int *tail = &stack[STACK_SIZE-1];
 	*node = g_start_node;
 
-	int i;
+	unsigned int i;
 
 	do
 	{
-		int first_child = tex1Dfetch(node_map, *node);
-		int child_count = tex1Dfetch(node_length, *node);
+		unsigned int first_child = tex1Dfetch(node_map, *node);
+		unsigned int stop = tex1Dfetch(node_map_end, *node);
 
-		while (*node >= g_first_node && child_count == 1)
+		while (*node >= g_first_node && stop == first_child+1)
 		{
 			*node = first_child;
 			first_child = tex1Dfetch(node_map, *node);
-			child_count = tex1Dfetch(node_length, *node);
+			stop = tex1Dfetch(node_map_end, *node);
 		}
 		
 		if (*node >= g_first_node)
 		{
-			for (i=0; i < child_count; i++)
+			for (i=first_child; i < stop; i++)
 			{
-				if (intersect_node(origin, direction, first_child+i))
+				if (intersect_node(origin, direction, i))
 				{
-					*node = first_child+i;
+					*node = i;
 					node++;
 				}
 			}
@@ -96,9 +96,9 @@ __device__ __noinline__ int get_color_alpha(const float3 &origin, const float3&
 		}
 		else // node is a leaf
 		{
-			for (i=0; i < child_count; i++)
+			for (i=first_child; i < stop; i++)
 			{
-				uint4 triangle_data = g_triangles[first_child+i];
+				uint4 triangle_data = g_triangles[i];
 
 				float3 v0 = g_vertices[triangle_data.x];
 				float3 v1 = g_vertices[triangle_data.y];
@@ -106,7 +106,7 @@ __device__ __noinline__ int get_color_alpha(const float3 &origin, const float3&
 
 				if (intersect_triangle(origin, direction, v0, v1, v2, distance))
 				{
-					add_to_hit_list(distance, first_child+i, h);
+					add_to_hit_list(distance, i, h);
 				}
 
 			} // triangle loop
-- 
cgit