Cycles: Support half and half4 textures.

This is an initial commit for half texture support in Cycles.
It adds the basic infrastructure inside of the ImageManager and support for these textures on CPU.

Supported:
* Half Float OpenEXR images (can be used for e.g HDRs or Normalmaps) now use 1/2 the memory, when loaded via disk (OIIO).

ToDo:
Various things like support for inbuilt half textures, GPU... will come later, step by step.

Part of my GSoC 2016.

1 files changed, 2 insertions, 0 deletions

diff --git a/intern/cycles/kernel/kernel_globals.h b/intern/cycles/kernel/kernel_globals.h
index e06c68f2fc9..8e66a3a0340 100644
--- a/intern/cycles/kernel/kernel_globals.h
+++ b/intern/cycles/kernel/kernel_globals.h
@@ -37,8 +37,10 @@ struct VolumeStep;
 typedef struct KernelGlobals {
 	texture_image_uchar4 texture_byte4_images[TEX_NUM_BYTE4_CPU];
 	texture_image_float4 texture_float4_images[TEX_NUM_FLOAT4_CPU];
+	texture_image_half4 texture_half4_images[TEX_NUM_HALF4_CPU];
 	texture_image_float texture_float_images[TEX_NUM_FLOAT_CPU];
 	texture_image_uchar texture_byte_images[TEX_NUM_BYTE_CPU];
+	texture_image_half texture_half_images[TEX_NUM_HALF_CPU];
 
 #  define KERNEL_TEX(type, ttype, name) ttype name;
 #  define KERNEL_IMAGE_TEX(type, ttype, name)