Compositor: New Exposure Node

This new node increases the radiance of an image by a scalar value.
Previously, the only way to adjust the the exposure of an image was with
math node or using the scene's color management.

Reviewed By: jbakker

Differential Revision: https://developer.blender.org/D9677

4 files changed, 49 insertions, 0 deletions

diff --git a/source/blender/nodes/CMakeLists.txt b/source/blender/nodes/CMakeLists.txt
index 866cf74d35b..60d4ee8f7c4 100644
--- a/source/blender/nodes/CMakeLists.txt
+++ b/source/blender/nodes/CMakeLists.txt
@@ -73,6 +73,7 @@ set(SRC
   composite/nodes/node_composite_distanceMatte.c
   composite/nodes/node_composite_doubleEdgeMask.c
   composite/nodes/node_composite_ellipsemask.c
+  composite/nodes/node_composite_exposure.c
   composite/nodes/node_composite_filter.c
   composite/nodes/node_composite_flip.c
   composite/nodes/node_composite_gamma.c
diff --git a/source/blender/nodes/NOD_composite.h b/source/blender/nodes/NOD_composite.h
index 99bcb849ebd..6ad02986010 100644
--- a/source/blender/nodes/NOD_composite.h
+++ b/source/blender/nodes/NOD_composite.h
@@ -56,6 +56,7 @@ void register_node_type_cmp_mix_rgb(void);
 void register_node_type_cmp_hue_sat(void);
 void register_node_type_cmp_brightcontrast(void);
 void register_node_type_cmp_gamma(void);
+void register_node_type_cmp_exposure(void);
 void register_node_type_cmp_invert(void);
 void register_node_type_cmp_alphaover(void);
 void register_node_type_cmp_zcombine(void);
diff --git a/source/blender/nodes/NOD_static_types.h b/source/blender/nodes/NOD_static_types.h
index 5b61594cca1..5156bac0e73 100644
--- a/source/blender/nodes/NOD_static_types.h
+++ b/source/blender/nodes/NOD_static_types.h
@@ -222,6 +222,7 @@ DefNode(CompositorNode, CMP_NODE_CORNERPIN,      0,                      "CORNER
 DefNode(CompositorNode, CMP_NODE_SUNBEAMS,       def_cmp_sunbeams,       "SUNBEAMS",       SunBeams,         "Sun Beams",         ""              )
 DefNode(CompositorNode, CMP_NODE_CRYPTOMATTE,    def_cmp_cryptomatte,    "CRYPTOMATTE",    Cryptomatte,      "Cryptomatte",       ""              )
 DefNode(CompositorNode, CMP_NODE_DENOISE,        def_cmp_denoise,        "DENOISE",        Denoise,          "Denoise",           ""              )
+DefNode(CompositorNode, CMP_NODE_EXPOSURE,       0,                      "EXPOSURE",       Exposure,         "Exposure",          ""              )
 
 DefNode(TextureNode,    TEX_NODE_OUTPUT,         def_tex_output,         "OUTPUT",         Output,           "Output",            ""              )
 DefNode(TextureNode,    TEX_NODE_CHECKER,        0,                      "CHECKER",        Checker,          "Checker",           ""              )
diff --git a/source/blender/nodes/composite/nodes/node_composite_exposure.c b/source/blender/nodes/composite/nodes/node_composite_exposure.c
new file mode 100644
index 00000000000..bd27e4a3d76
--- /dev/null
+++ b/source/blender/nodes/composite/nodes/node_composite_exposure.c
@@ -0,0 +1,46 @@
+/*
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * The Original Code is Copyright (C) 2020 Blender Foundation.
+ * All rights reserved.
+ */
+
+/** \file
+ * \ingroup cmpnodes
+ */
+
+#include "node_composite_util.h"
+
+/* **************** Exposure ******************** */
+
+static bNodeSocketTemplate cmp_node_exposure_in[] = {
+    {SOCK_RGBA, N_("Image"), 1.0f, 1.0f, 1.0f, 1.0f},
+    {SOCK_FLOAT, N_("Exposure"), 0.0f, 0.0f, 0.0f, 0.0f, -10.0f, 10.0f, PROP_NONE},
+    {-1, ""},
+};
+static bNodeSocketTemplate cmp_node_exposure_out[] = {
+    {SOCK_RGBA, N_("Image")},
+    {-1, ""},
+};
+
+void register_node_type_cmp_exposure(void)
+{
+  static bNodeType ntype;
+
+  cmp_node_type_base(&ntype, CMP_NODE_EXPOSURE, "Exposure", NODE_CLASS_OP_COLOR, 0);
+  node_type_socket_templates(&ntype, cmp_node_exposure_in, cmp_node_exposure_out);
+
+  nodeRegisterType(&ntype);
+}