Add a Framebuffer cache

Adds a FramebufferCache singletion that operates the same way as UniformSetCache.

Allows creating framebuffers on the fly (and keep them cached if re-requested) such as:

```C++
RID fb = FramebufferCache::get_singleton()->get_cache(texture1,texture2);
```

1 files changed, 10 insertions, 10 deletions

diff --git a/core/templates/rid_owner.h b/core/templates/rid_owner.h
index 9c74b41818..320faebe98 100644
--- a/core/templates/rid_owner.h
+++ b/core/templates/rid_owner.h
@@ -79,7 +79,7 @@ class RID_Alloc : public RID_AllocBase {
 
 	const char *description = nullptr;
 
-	SpinLock spin_lock;
+	mutable SpinLock spin_lock;
 
 	_FORCE_INLINE_ RID _allocate_rid() {
 		if (THREAD_SAFE) {
@@ -220,7 +220,7 @@ public:
 		memnew_placement(mem, T(p_value));
 	}
 
-	_FORCE_INLINE_ bool owns(const RID &p_rid) {
+	_FORCE_INLINE_ bool owns(const RID &p_rid) const {
 		if (THREAD_SAFE) {
 			spin_lock.lock();
 		}
@@ -292,7 +292,7 @@ public:
 	_FORCE_INLINE_ uint32_t get_rid_count() const {
 		return alloc_count;
 	}
-	void get_owned_list(List<RID> *p_owned) {
+	void get_owned_list(List<RID> *p_owned) const {
 		if (THREAD_SAFE) {
 			spin_lock.lock();
 		}
@@ -308,7 +308,7 @@ public:
 	}
 
 	//used for fast iteration in the elements or RIDs
-	void fill_owned_buffer(RID *p_rid_buffer) {
+	void fill_owned_buffer(RID *p_rid_buffer) const {
 		if (THREAD_SAFE) {
 			spin_lock.lock();
 		}
@@ -402,7 +402,7 @@ public:
 		*ptr = p_new_ptr;
 	}
 
-	_FORCE_INLINE_ bool owns(const RID &p_rid) {
+	_FORCE_INLINE_ bool owns(const RID &p_rid) const {
 		return alloc.owns(p_rid);
 	}
 
@@ -414,11 +414,11 @@ public:
 		return alloc.get_rid_count();
 	}
 
-	_FORCE_INLINE_ void get_owned_list(List<RID> *p_owned) {
+	_FORCE_INLINE_ void get_owned_list(List<RID> *p_owned) const {
 		return alloc.get_owned_list(p_owned);
 	}
 
-	void fill_owned_buffer(RID *p_rid_buffer) {
+	void fill_owned_buffer(RID *p_rid_buffer) const {
 		alloc.fill_owned_buffer(p_rid_buffer);
 	}
 
@@ -458,7 +458,7 @@ public:
 		return alloc.get_or_null(p_rid);
 	}
 
-	_FORCE_INLINE_ bool owns(const RID &p_rid) {
+	_FORCE_INLINE_ bool owns(const RID &p_rid) const {
 		return alloc.owns(p_rid);
 	}
 
@@ -470,10 +470,10 @@ public:
 		return alloc.get_rid_count();
 	}
 
-	_FORCE_INLINE_ void get_owned_list(List<RID> *p_owned) {
+	_FORCE_INLINE_ void get_owned_list(List<RID> *p_owned) const {
 		return alloc.get_owned_list(p_owned);
 	}
-	void fill_owned_buffer(RID *p_rid_buffer) {
+	void fill_owned_buffer(RID *p_rid_buffer) const {
 		alloc.fill_owned_buffer(p_rid_buffer);
 	}