Brightness/Contrast Node for Cycles

Contrast helps to adjust IBL (HDR images used for background lighting).
Note: In the UI we are caling it Bright instead of Brightness. This copy what Blender composite is doing.
Note2: the algorithm we are using produces pure black when contrast is 100. I'm not a fan of that, but it's a division by zero. I would like to look at other algorithms (what gimp does for example). But that would be only after 2.62.

1 files changed, 3 insertions, 0 deletions

diff --git a/intern/cycles/app/cycles_xml.cpp b/intern/cycles/app/cycles_xml.cpp
index af52520d87c..5e4b3da071d 100644
--- a/intern/cycles/app/cycles_xml.cpp
+++ b/intern/cycles/app/cycles_xml.cpp
@@ -462,6 +462,9 @@ static void xml_read_shader_graph(const XMLReadState& state, Shader *shader, pug
 		else if(string_iequals(node.name(), "gamma")) {
 			snode = new GammaNode();
 		}
+		else if(string_iequals(node.name(), "brightness")) {
+			snode = new BrightContrastNode();
+		}
 		else if(string_iequals(node.name(), "combine_rgb")) {
 			snode = new CombineRGBNode();
 		}