Realtime Compositor: Add needed GPU module changes

This patch implements the necessary changes to the GPU module that are
needed by the realtime compositor.

A new function GPU_material_from_callbacks was added to construct a GPU
material from a number of callbacks. A callback to construct the
material graph by adding and linking the necessary GPU material nodes.
And the existing code generator callback. This essentially allows the
construction of GPU materials independent of node trees and without the
need to do any node tree localization.

A new composite source output to the code generator was added. This
output contains the serialization of nodes that are tagged with
GPU_NODE_TAG_COMPOSITOR, which are the nodes linked to the newly added
composite output links.

Two new GPU uniform setters were added for int2 and matrix3 types.

Shader create info now supports generated compute sources.

Shaders starting with gpu_shader_compositor are now considered part of
the shader library.

Additionally, two fixes were implemented. First, GPU setter node
de-duplication now appropriately increments the reference count of the
references resources. Second, unlinked sockets now get their value from
their associated GPU node stack instead of the socket itself.

Differential Revision: https://developer.blender.org/D14690

Reviewed By: Clement

1 files changed, 3 insertions, 0 deletions

diff --git a/source/blender/gpu/intern/gpu_node_graph.h b/source/blender/gpu/intern/gpu_node_graph.h
index ae472d5b7aa..08ff8bbef58 100644
--- a/source/blender/gpu/intern/gpu_node_graph.h
+++ b/source/blender/gpu/intern/gpu_node_graph.h
@@ -59,6 +59,7 @@ typedef enum {
   GPU_NODE_TAG_THICKNESS = (1 << 3),
   GPU_NODE_TAG_AOV = (1 << 4),
   GPU_NODE_TAG_FUNCTION = (1 << 5),
+  GPU_NODE_TAG_COMPOSITOR = (1 << 6),
 } eGPUNodeTag;
 
 ENUM_OPERATORS(eGPUNodeTag, GPU_NODE_TAG_FUNCTION)
@@ -158,6 +159,8 @@ typedef struct GPUNodeGraph {
   ListBase outlink_aovs;
   /* List of GPUNodeGraphFunctionLink */
   ListBase material_functions;
+  /* List of GPUNodeGraphOutputLink */
+  ListBase outlink_compositor;
 
   /* Requested attributes and textures. */
   ListBase attributes;