Implement GPU-side dither

Summary:
Uses some magic pseudo-random which is actually a
texture coordinate hashing function.

TODOs:
- Dither noise is the same for all the frames.
- It's different from Floyd's dither we've been
  using before.
- Currently CPU and GPU dithering used different
  implementation. Ideally we need to use the same
  dither in CPU.

Reviewers: brecht

Reviewed By: brecht

Differential Revision: http://developer.blender.org/D58

1 files changed, 2 insertions, 1 deletions

diff --git a/intern/opencolorio/fallback_impl.cc b/intern/opencolorio/fallback_impl.cc
index 6383bbbb07f..c0797cbc37f 100644
--- a/intern/opencolorio/fallback_impl.cc
+++ b/intern/opencolorio/fallback_impl.cc
@@ -419,7 +419,8 @@ bool FallbackImpl::supportGLSLDraw(void)
 }
 
 bool FallbackImpl::setupGLSLDraw(struct OCIO_GLSLDrawState ** /*state_r*/, OCIO_ConstProcessorRcPtr * /*processor*/,
-                                 OCIO_CurveMappingSettings * /*curve_mapping_settings*/, bool /*predivide*/)
+                                 OCIO_CurveMappingSettings * /*curve_mapping_settings*/,
+                                 float /*dither*/,  bool /*predivide*/)
 {
 	return false;
 }