This patch implements the following nodes for the realtime compositor: - Alpha over node. - Bright contrast node. - Color balance node. - Color correction node. - Exposure node. - Gamma node. - Hue correct node. - Hue saturation value node. - Invert node. - Mix node. - Posterize node. - Time curve node. - Vector curve node. Differential Revision: https://developer.blender.org/D15228 Reviewed By: Clement Foucault