1 files changed, 38 insertions, 1 deletions

diff --git a/source/blender/nodes/composite/nodes/node_composite_premulkey.cc b/source/blender/nodes/composite/nodes/node_composite_premulkey.cc
index 000cc9df90a..c814ea5f738 100644
--- a/source/blender/nodes/composite/nodes/node_composite_premulkey.cc
+++ b/source/blender/nodes/composite/nodes/node_composite_premulkey.cc
@@ -8,6 +8,10 @@
 #include "UI_interface.h"
 #include "UI_resources.h"
 
+#include "GPU_material.h"
+
+#include "COM_shader_node.hh"
+
 #include "node_composite_util.hh"
 
 /* **************** Premul and Key Alpha Convert ******************** */
@@ -16,7 +20,9 @@ namespace blender::nodes::node_composite_premulkey_cc {
 
 static void cmp_node_premulkey_declare(NodeDeclarationBuilder &b)
 {
-  b.add_input<decl::Color>(N_("Image")).default_value({1.0f, 1.0f, 1.0f, 1.0f});
+  b.add_input<decl::Color>(N_("Image"))
+      .default_value({1.0f, 1.0f, 1.0f, 1.0f})
+      .compositor_domain_priority(0);
   b.add_output<decl::Color>(N_("Image"));
 }
 
@@ -25,6 +31,36 @@ static void node_composit_buts_premulkey(uiLayout *layout, bContext *UNUSED(C),
   uiItemR(layout, ptr, "mapping", UI_ITEM_R_SPLIT_EMPTY_NAME, "", ICON_NONE);
 }
 
+using namespace blender::realtime_compositor;
+
+class AlphaConvertShaderNode : public ShaderNode {
+ public:
+  using ShaderNode::ShaderNode;
+
+  void compile(GPUMaterial *material) override
+  {
+    GPUNodeStack *inputs = get_inputs_array();
+    GPUNodeStack *outputs = get_outputs_array();
+
+    if (get_mode() == 0) {
+      GPU_stack_link(material, &bnode(), "color_alpha_premultiply", inputs, outputs);
+      return;
+    }
+
+    GPU_stack_link(material, &bnode(), "color_alpha_unpremultiply", inputs, outputs);
+  }
+
+  CMPNodeAlphaConvertMode get_mode()
+  {
+    return (CMPNodeAlphaConvertMode)bnode().custom1;
+  }
+};
+
+static ShaderNode *get_compositor_shader_node(DNode node)
+{
+  return new AlphaConvertShaderNode(node);
+}
+
 }  // namespace blender::nodes::node_composite_premulkey_cc
 
 void register_node_type_cmp_premulkey()
@@ -36,6 +72,7 @@ void register_node_type_cmp_premulkey()
   cmp_node_type_base(&ntype, CMP_NODE_PREMULKEY, "Alpha Convert", NODE_CLASS_CONVERTER);
   ntype.declare = file_ns::cmp_node_premulkey_declare;
   ntype.draw_buttons = file_ns::node_composit_buts_premulkey;
+  ntype.get_compositor_shader_node = file_ns::get_compositor_shader_node;
 
   nodeRegisterType(&ntype);
 }