Compositor: implement OpenCL backend for gaussian blur

Pretty much straightforward change which gives around 30%
speedup on my laptop and around 2x speedup on desktop in
the BI (which uses gts580). Tested with huge blurs (like
10% of blur) which was rather common during Caminandes.

For now OpenCL is only limited for blur size more than
100 pixels.

This is a bit experimental still, feedback is welcome.

Reviewers: jbakker, lukastoenne

Subscribers: ton

Differential Revision: https://developer.blender.org/D576

1 files changed, 2 insertions, 0 deletions

diff --git a/source/blender/compositor/nodes/COM_BlurNode.cpp b/source/blender/compositor/nodes/COM_BlurNode.cpp
index 76e52c14685..f3d0c33d3b3 100644
--- a/source/blender/compositor/nodes/COM_BlurNode.cpp
+++ b/source/blender/compositor/nodes/COM_BlurNode.cpp
@@ -105,6 +105,7 @@ void BlurNode::convertToOperations(NodeConverter &converter, const CompositorCon
 		GaussianXBlurOperation *operationx = new GaussianXBlurOperation();
 		operationx->setData(data);
 		operationx->setQuality(quality);
+		operationx->checkOpenCL();
 		
 		converter.addOperation(operationx);
 		converter.mapInputSocket(getInputSocket(1), operationx->getInputSocket(1));
@@ -112,6 +113,7 @@ void BlurNode::convertToOperations(NodeConverter &converter, const CompositorCon
 		GaussianYBlurOperation *operationy = new GaussianYBlurOperation();
 		operationy->setData(data);
 		operationy->setQuality(quality);
+		operationy->checkOpenCL();
 
 		converter.addOperation(operationy);
 		converter.mapInputSocket(getInputSocket(1), operationy->getInputSocket(1));