1 files changed, 64 insertions, 3 deletions

diff --git a/source/blender/nodes/composite/nodes/node_composite_math.cc b/source/blender/nodes/composite/nodes/node_composite_math.cc
index 7b2eadef2cb..4baf057913e 100644
--- a/source/blender/nodes/composite/nodes/node_composite_math.cc
+++ b/source/blender/nodes/composite/nodes/node_composite_math.cc
@@ -5,6 +5,12 @@
  * \ingroup cmpnodes
  */
 
+#include "GPU_material.h"
+
+#include "COM_shader_node.hh"
+
+#include "NOD_math_functions.hh"
+
 #include "node_composite_util.hh"
 
 /* **************** SCALAR MATH ******************** */
@@ -13,18 +19,72 @@ namespace blender::nodes::node_composite_math_cc {
 
 static void cmp_node_math_declare(NodeDeclarationBuilder &b)
 {
-  b.add_input<decl::Float>(N_("Value")).default_value(0.5f).min(-10000.0f).max(10000.0f);
+  b.add_input<decl::Float>(N_("Value"))
+      .default_value(0.5f)
+      .min(-10000.0f)
+      .max(10000.0f)
+      .compositor_domain_priority(0);
   b.add_input<decl::Float>(N_("Value"), "Value_001")
       .default_value(0.5f)
       .min(-10000.0f)
-      .max(10000.0f);
+      .max(10000.0f)
+      .compositor_domain_priority(1);
   b.add_input<decl::Float>(N_("Value"), "Value_002")
       .default_value(0.5f)
       .min(-10000.0f)
-      .max(10000.0f);
+      .max(10000.0f)
+      .compositor_domain_priority(2);
   b.add_output<decl::Float>(N_("Value"));
 }
 
+using namespace blender::realtime_compositor;
+
+class MathShaderNode : public ShaderNode {
+ public:
+  using ShaderNode::ShaderNode;
+
+  void compile(GPUMaterial *material) override
+  {
+    GPUNodeStack *inputs = get_inputs_array();
+    GPUNodeStack *outputs = get_outputs_array();
+
+    GPU_stack_link(material, &bnode(), get_shader_function_name(), inputs, outputs);
+
+    if (!get_should_clamp()) {
+      return;
+    }
+
+    const float min = 0.0f;
+    const float max = 1.0f;
+    GPU_link(material,
+             "clamp_value",
+             get_output("Value").link,
+             GPU_constant(&min),
+             GPU_constant(&max),
+             &get_output("Value").link);
+  }
+
+  NodeMathOperation get_operation()
+  {
+    return (NodeMathOperation)bnode().custom1;
+  }
+
+  const char *get_shader_function_name()
+  {
+    return get_float_math_operation_info(get_operation())->shader_name.c_str();
+  }
+
+  bool get_should_clamp()
+  {
+    return bnode().custom2 & SHD_MATH_CLAMP;
+  }
+};
+
+static ShaderNode *get_compositor_shader_node(DNode node)
+{
+  return new MathShaderNode(node);
+}
+
 }  // namespace blender::nodes::node_composite_math_cc
 
 void register_node_type_cmp_math()
@@ -37,6 +97,7 @@ void register_node_type_cmp_math()
   ntype.declare = file_ns::cmp_node_math_declare;
   ntype.labelfunc = node_math_label;
   node_type_update(&ntype, node_math_update);
+  ntype.get_compositor_shader_node = file_ns::get_compositor_shader_node;
 
   nodeRegisterType(&ntype);
 }