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, 4 insertions, 2 deletions

diff --git a/intern/cycles/render/image.h b/intern/cycles/render/image.h
index 187c5fd0f02..85b6b512bae 100644
--- a/intern/cycles/render/image.h
+++ b/intern/cycles/render/image.h
@@ -49,8 +49,8 @@ public:
 	ImageManager();
 	~ImageManager();
 
-	int add_image(const string& filename, void *builtin_data, bool animated, bool& is_float, bool& is_linear);
-	void remove_image(const string& filename, void *builtin_data);
+	int add_image(const string& filename, void *builtin_data, bool animated, bool& is_float, bool& is_linear, InterpolationType interpolation);
+	void remove_image(const string& filename, void *builtin_data, InterpolationType interpolation);
 	bool is_float_image(const string& filename, void *builtin_data, bool& is_linear);
 
 	void device_update(Device *device, DeviceScene *dscene, Progress& progress);
@@ -79,6 +79,8 @@ private:
 
 		bool need_load;
 		bool animated;
+		InterpolationType interpolation;
+
 		int users;
 	};