Cycles: Add utility function to calculate curve boundbox from given 4 keys

Also fixed some issues with motion keys calculation:

- Clamp lower and upper limits of curves so we can safely call those
  functions for the very first and very last curve segment.
- Fixed wrong indexing for the curve radius array.
- Fixed wrong motion attribute offset calculation.

1 files changed, 5 insertions, 0 deletions

diff --git a/intern/cycles/render/mesh.h b/intern/cycles/render/mesh.h
index b29a2561a0e..5f33e30eac2 100644
--- a/intern/cycles/render/mesh.h
+++ b/intern/cycles/render/mesh.h
@@ -95,6 +95,7 @@ public:
 		                 const float3 *curve_keys,
 		                 const float *curve_radius,
 		                 BoundBox& bounds) const;
+		void bounds_grow(float4 keys[4], BoundBox& bounds) const;
 		void bounds_grow(const int k,
 		                 const float3 *curve_keys,
 		                 const float *curve_radius,
@@ -104,6 +105,7 @@ public:
 		void motion_keys(const float3 *curve_keys,
 		                 const float *curve_radius,
 		                 const float3 *key_steps,
+		                 size_t num_curve_keys,
 		                 size_t num_steps,
 		                 float time,
 		                 size_t k0, size_t k1,
@@ -111,6 +113,7 @@ public:
 		void cardinal_motion_keys(const float3 *curve_keys,
 		                          const float *curve_radius,
 		                          const float3 *key_steps,
+		                          size_t num_curve_keys,
 		                          size_t num_steps,
 		                          float time,
 		                          size_t k0, size_t k1,
@@ -120,6 +123,7 @@ public:
 		void keys_for_step(const float3 *curve_keys,
 		                   const float *curve_radius,
 		                   const float3 *key_steps,
+		                   size_t num_curve_keys,
 		                   size_t num_steps,
 		                   size_t step,
 		                   size_t k0, size_t k1,
@@ -127,6 +131,7 @@ public:
 		void cardinal_keys_for_step(const float3 *curve_keys,
 		                            const float *curve_radius,
 		                            const float3 *key_steps,
+		                            size_t num_curve_keys,
 		                            size_t num_steps,
 		                            size_t step,
 		                            size_t k0, size_t k1,