Add support for multiple interpolation modes on cycles image textures

All textures are sampled bi-linear currently with the exception of OSL there texture sampling is fixed and set to smart bi-cubic.

This patch adds user control to this setting.

Added:
- bits to DNA / RNA in the form of an enum for supporting multiple interpolations types
- changes to the image texture node drawing code ( add enum)
- to ImageManager (this needs to know to allocate second texture when interpolation type is different)
- to node compiler (pass on interpolation type)
- to device tex_alloc this also needs to get the concept of multiple interpolation types
- implementation for doing non interpolated lookup for cuda and cpu
- implementation where we pass this along to osl ( this makes OSL also do linear untill I add smartcubic to the interface / DNA/ RNA)

Reviewers: brecht, dingto

Reviewed By: brecht

CC: dingto, venomgfx

Differential Revision: https://developer.blender.org/D317

1 files changed, 2 insertions, 2 deletions

diff --git a/intern/cycles/device/device_network.cpp b/intern/cycles/device/device_network.cpp
index bffd993818f..8f00324c3e1 100644
--- a/intern/cycles/device/device_network.cpp
+++ b/intern/cycles/device/device_network.cpp
@@ -162,7 +162,7 @@ public:
 		snd.write_buffer(host, size);
 	}
 
-	void tex_alloc(const char *name, device_memory& mem, bool interpolation, bool periodic)
+	void tex_alloc(const char *name, device_memory& mem, InterpolationType interpolation, bool periodic)
 	{
 		thread_scoped_lock lock(rpc_lock);
 
@@ -559,7 +559,7 @@ protected:
 		else if(rcv.name == "tex_alloc") {
 			network_device_memory mem;
 			string name;
-			bool interpolation;
+			InterpolationType interpolation;
 			bool periodic;
 			device_ptr client_pointer;