Implement global and per instance shader uniforms.

Adds two keywords to shader language for uniforms:
-'global'
-'instance'

This allows them to reference values outside the material.

1 files changed, 37 insertions, 0 deletions

diff --git a/scene/main/shader_globals_override.h b/scene/main/shader_globals_override.h
new file mode 100644
index 0000000000..33d0dc948f
--- /dev/null
+++ b/scene/main/shader_globals_override.h
@@ -0,0 +1,37 @@
+#ifndef SHADER_GLOBALS_OVERRIDE_H
+#define SHADER_GLOBALS_OVERRIDE_H
+
+#include "scene/3d/node_3d.h"
+
+class ShaderGlobalsOverride : public Node {
+
+	GDCLASS(ShaderGlobalsOverride, Node);
+
+	struct Override {
+		bool in_use = false;
+		Variant override;
+	};
+
+	StringName *_remap(const StringName &p_name) const;
+
+	bool active;
+	mutable HashMap<StringName, Override> overrides;
+	mutable HashMap<StringName, StringName> param_remaps;
+
+	void _activate();
+
+protected:
+	bool _set(const StringName &p_name, const Variant &p_value);
+	bool _get(const StringName &p_name, Variant &r_ret) const;
+	void _get_property_list(List<PropertyInfo> *p_list) const;
+
+	void _notification(int p_what);
+	static void _bind_methods();
+
+public:
+	String get_configuration_warning() const;
+
+	ShaderGlobalsOverride();
+};
+
+#endif // SHADER_GLOBALS_OVERRIDE_H