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, 1 insertions, 1 deletions

diff --git a/intern/cycles/kernel/kernel.h b/intern/cycles/kernel/kernel.h
index 039dc791b08..a4f13e78006 100644
--- a/intern/cycles/kernel/kernel.h
+++ b/intern/cycles/kernel/kernel.h
@@ -32,7 +32,7 @@ void *kernel_osl_memory(KernelGlobals *kg);
 bool kernel_osl_use(KernelGlobals *kg);
 
 void kernel_const_copy(KernelGlobals *kg, const char *name, void *host, size_t size);
-void kernel_tex_copy(KernelGlobals *kg, const char *name, device_ptr mem, size_t width, size_t height);
+void kernel_tex_copy(KernelGlobals *kg, const char *name, device_ptr mem, size_t width, size_t height, InterpolationType interpolation=INTERPOLATION_LINEAR);
 
 void kernel_cpu_path_trace(KernelGlobals *kg, float *buffer, unsigned int *rng_state,
 	int sample, int x, int y, int offset, int stride);