Add support for enhanced barriers in D3D12.

Enables support for enhanced barriers if available.

Gets rid of the implementation of [CROSS_FAMILY_FALLBACK] in the D3D12 driver. The logic has been reimplemented at a higher level in RenderingDevice itself.

This fallback is only used if the RenderingDeviceDriver reports the API traits and the capability of sharing texture formats correctly. Aliases created in this way can only be used for sampling: never for writing. In most cases, the formats that do not support sharing do not support unordered access/storage writes in the first place.

drivers/d3d12/rendering_device_driver_d3d12.h

@@ -122,6 +122,10 @@ class RenderingDeviceDriverD3D12 : public RenderingDeviceDriver {
 		bool relaxed_casting_supported = false;
 	};
 
+	struct BarrierCapabilities {
+		bool enhanced_barriers_supported = false;
+	};
+
 	RenderingContextDriverD3D12 *context_driver = nullptr;
 	RenderingContextDriver::Device context_device;
 	ComPtr<IDXGIAdapter> adapter;
@@ -136,6 +140,7 @@ class RenderingDeviceDriverD3D12 : public RenderingDeviceDriver {
 	ShaderCapabilities shader_capabilities;
 	StorageBufferCapabilities storage_buffer_capabilities;
 	FormatCapabilities format_capabilities;
+	BarrierCapabilities barrier_capabilities;
 	String pipeline_cache_id;
 
 	class DescriptorsHeap {
@@ -218,11 +223,6 @@ class RenderingDeviceDriverD3D12 : public RenderingDeviceDriver {
 			// As many subresources as mipmaps * layers; planes (for depth-stencil) are tracked together.
 			TightLocalVector<D3D12_RESOURCE_STATES> subresource_states; // Used only if not a view.
 			uint32_t last_batch_with_uav_barrier = 0;
-			struct CrossFamillyFallback {
-				TightLocalVector<uint64_t> subresources_dirty;
-				ComPtr<ID3D12Resource> interim_buffer;
-				ComPtr<D3D12MA::Allocation> interim_buffer_alloc;
-			} xfamily_fallback; // [[CROSS_FAMILY_FALLBACK]].
 		};
 
 		ID3D12Resource *resource = nullptr; // Non-null even if not owned.
@@ -275,7 +275,6 @@ class RenderingDeviceDriverD3D12 : public RenderingDeviceDriver {
 		uint64_t size = 0;
 		struct {
 			bool usable_as_uav : 1;
-			bool is_for_upload : 1;
 		} flags = {};
 	};
 
@@ -317,10 +316,14 @@ class RenderingDeviceDriverD3D12 : public RenderingDeviceDriver {
 	UINT _compute_component_mapping(const TextureView &p_view);
 	UINT _compute_plane_slice(DataFormat p_format, BitField<TextureAspectBits> p_aspect_bits);
 	UINT _compute_plane_slice(DataFormat p_format, TextureAspect p_aspect);
+	UINT _compute_subresource_from_layers(TextureInfo *p_texture, const TextureSubresourceLayers &p_layers, uint32_t p_layer_offset);
 
 	struct CommandBufferInfo;
 	void _discard_texture_subresources(const TextureInfo *p_tex_info, const CommandBufferInfo *p_cmd_buf_info);
 
+protected:
+	virtual bool _unordered_access_supported_by_format(DataFormat p_format);
+
 public:
 	virtual TextureID texture_create(const TextureFormat &p_format, const TextureView &p_view) override final;
 	virtual TextureID texture_create_from_extension(uint64_t p_native_texture, TextureType p_type, DataFormat p_format, uint32_t p_array_layers, bool p_depth_stencil) override final;
@@ -332,6 +335,7 @@ class RenderingDeviceDriverD3D12 : public RenderingDeviceDriver {
 	virtual uint8_t *texture_map(TextureID p_texture, const TextureSubresource &p_subresource) override final;
 	virtual void texture_unmap(TextureID p_texture) override final;
 	virtual BitField<TextureUsageBits> texture_get_usages_supported_by_format(DataFormat p_format, bool p_cpu_readable) override final;
+	virtual bool texture_can_make_shared_with_format(TextureID p_texture, DataFormat p_format, bool &r_raw_reinterpretation) override final;
 
 private:
 	TextureID _texture_create_shared_from_slice(TextureID p_original_texture, const TextureView &p_view, TextureSliceType p_slice_type, uint32_t p_layer, uint32_t p_layers, uint32_t p_mipmap, uint32_t p_mipmaps);
@@ -367,8 +371,8 @@ class RenderingDeviceDriverD3D12 : public RenderingDeviceDriver {
 
 	virtual void command_pipeline_barrier(
 			CommandBufferID p_cmd_buffer,
-			BitField<RDD::PipelineStageBits> p_src_stages,
-			BitField<RDD::PipelineStageBits> p_dst_stages,
+			BitField<PipelineStageBits> p_src_stages,
+			BitField<PipelineStageBits> p_dst_stages,
 			VectorView<RDD::MemoryBarrier> p_memory_barriers,
 			VectorView<RDD::BufferBarrier> p_buffer_barriers,
 			VectorView<RDD::TextureBarrier> p_texture_barriers) override final;
@@ -465,16 +469,6 @@ class RenderingDeviceDriverD3D12 : public RenderingDeviceDriver {
 
 		RenderPassState render_pass_state;
 		bool descriptor_heaps_set = false;
-
-		// [[CROSS_FAMILY_FALLBACK]].
-		struct FamilyFallbackCopy {
-			TextureInfo *texture = nullptr;
-			uint32_t subresource = 0;
-			uint32_t mipmap = 0;
-			D3D12_RESOURCE_STATES dst_wanted_state = {};
-		};
-		LocalVector<FamilyFallbackCopy> family_fallback_copies;
-		uint32_t family_fallback_copy_count = 0;
 	};
 
 public:
@@ -961,7 +955,6 @@ class RenderingDeviceDriverD3D12 : public RenderingDeviceDriver {
 			bool rtv = false;
 		} desc_heaps_exhausted_reported;
 		CD3DX12_CPU_DESCRIPTOR_HANDLE null_rtv_handle = {}; // For [[MANUAL_SUBPASSES]].
-		ComPtr<D3D12MA::Allocation> aux_resource;
 		uint32_t segment_serial = 0;
 
 #ifdef DEV_ENABLED