GPU: Make nodetree GLSL Codegen render engine agnostic

This commit removes all EEVEE specific code from the `gpu_shader_material*.glsl`
files. It defines a clear interface to evaluate the closure nodes leaving
more flexibility to the render engine.

Some of the long standing workaround are fixed:
- bump mapping support is no longer duplicating a lot of node and is instead
  compiled into a function call.
- bump rewiring to Normal socket is no longer needed as we now use a global
  `g_data.N` for that.


Closure sampling with upstread weight eval is now supported if the engine needs
it.

This also makes all the material GLSL sources use `GPUSource` for better
debugging experience. The `GPUFunction` parsing now happens in `GPUSource`
creation.

The whole `GPUCodegen` now uses the `ShaderCreateInfo` and is object type
agnostic. Is has also been rewritten in C++.

This patch changes a view behavior for EEVEE:
- Mix shader node factor imput is now clamped.
- Tangent Vector displacement behavior is now matching cycles.
- The chosen BSDF used for SSR might change.
- Hair shading may have very small changes on very large hairs when using hair
  polygon stripes.
- ShaderToRGB node will remove any SSR and SSS form a shader.
- SSS radius input now is no longer a scaling factor but defines an average
  radius. The SSS kernel "shape" (radii) are still defined by the socket default
  values.

Appart from the listed changes no other regressions are expected.

1 files changed, 2 insertions, 9 deletions

diff --git a/source/blender/nodes/shader/nodes/node_shader_object_info.cc b/source/blender/nodes/shader/nodes/node_shader_object_info.cc
index 03c1a018d37..8985ab6d0e9 100644
--- a/source/blender/nodes/shader/nodes/node_shader_object_info.cc
+++ b/source/blender/nodes/shader/nodes/node_shader_object_info.cc
@@ -23,15 +23,8 @@ static int node_shader_gpu_object_info(GPUMaterial *mat,
 {
   Material *ma = GPU_material_get_material(mat);
   float index = ma ? ma->index : 0.0f;
-  return GPU_stack_link(mat,
-                        node,
-                        "node_object_info",
-                        in,
-                        out,
-                        GPU_builtin(GPU_OBJECT_MATRIX),
-                        GPU_builtin(GPU_OBJECT_COLOR),
-                        GPU_builtin(GPU_OBJECT_INFO),
-                        GPU_constant(&index));
+  GPU_material_flag_set(mat, GPU_MATFLAG_OBJECT_INFO);
+  return GPU_stack_link(mat, node, "node_object_info", in, out, GPU_constant(&index));
 }
 
 }  // namespace blender::nodes::node_shader_object_info_cc