Metal: Add support for 2017 era iOS devices

This commit introduces support for checking the argument buffer tier,
and falling back to disabling argument buffers when tier 1 is available.

Closes godotengine#99682

Author: stuartcarnie

drivers/metal/metal_device_properties.h

@@ -71,18 +71,19 @@ typedef NS_OPTIONS(NSUInteger, SampleCount) {
 };
 
 struct API_AVAILABLE(macos(11.0), ios(14.0)) MetalFeatures {
-	uint32_t mslVersion;
-	MTLGPUFamily highestFamily;
-	MTLLanguageVersion mslVersionEnum;
-	SampleCount supportedSampleCounts;
-	long hostMemoryPageSize;
-	bool layeredRendering;
-	bool multisampleLayeredRendering;
-	bool quadPermute; /**< If true, quadgroup permutation functions (vote, ballot, shuffle) are supported in shaders. */
-	bool simdPermute; /**< If true, SIMD-group permutation functions (vote, ballot, shuffle) are supported in shaders. */
-	bool simdReduction; /**< If true, SIMD-group reduction functions (arithmetic) are supported in shaders. */
-	bool tessellationShader; /**< If true, tessellation shaders are supported. */
-	bool imageCubeArray; /**< If true, image cube arrays are supported. */
+	uint32_t mslVersion = 0;
+	MTLGPUFamily highestFamily = MTLGPUFamilyApple4;
+	MTLLanguageVersion mslVersionEnum = MTLLanguageVersion1_2;
+	SampleCount supportedSampleCounts = SampleCount1;
+	long hostMemoryPageSize = 0;
+	bool layeredRendering = false;
+	bool multisampleLayeredRendering = false;
+	bool quadPermute = false; /**< If true, quadgroup permutation functions (vote, ballot, shuffle) are supported in shaders. */
+	bool simdPermute = false; /**< If true, SIMD-group permutation functions (vote, ballot, shuffle) are supported in shaders. */
+	bool simdReduction = false; /**< If true, SIMD-group reduction functions (arithmetic) are supported in shaders. */
+	bool tessellationShader = false; /**< If true, tessellation shaders are supported. */
+	bool imageCubeArray = false; /**< If true, image cube arrays are supported. */
+	MTLArgumentBuffersTier argument_buffers_tier = MTLArgumentBuffersTier1;
 };
 
 struct MetalLimits {

drivers/metal/metal_device_properties.mm

@@ -98,6 +98,7 @@
 	features.quadPermute = [p_device supportsFamily:MTLGPUFamilyApple4];
 	features.simdPermute = [p_device supportsFamily:MTLGPUFamilyApple6];
 	features.simdReduction = [p_device supportsFamily:MTLGPUFamilyApple7];
+	features.argument_buffers_tier = p_device.argumentBuffersSupport;
 
 	MTLCompileOptions *opts = [MTLCompileOptions new];
 	features.mslVersionEnum = opts.languageVersion; // By default, Metal uses the most recent language version.

drivers/metal/metal_objects.h

@@ -696,11 +696,12 @@ class API_AVAILABLE(macos(11.0), ios(14.0)) MDShader {
 public:
 	CharString name;
 	Vector<UniformSet> sets;
+	bool uses_argument_buffers = true;
 
 	virtual void encode_push_constant_data(VectorView<uint32_t> p_data, MDCommandBuffer *p_cb) = 0;
 
-	MDShader(CharString p_name, Vector<UniformSet> p_sets) :
-			name(p_name), sets(p_sets) {}
+	MDShader(CharString p_name, Vector<UniformSet> p_sets, bool p_uses_argument_buffers) :
+			name(p_name), sets(p_sets), uses_argument_buffers(p_uses_argument_buffers) {}
 	virtual ~MDShader() = default;
 };
 
@@ -719,7 +720,7 @@ class API_AVAILABLE(macos(11.0), ios(14.0)) MDComputeShader final : public MDSha
 
 	void encode_push_constant_data(VectorView<uint32_t> p_data, MDCommandBuffer *p_cb) final;
 
-	MDComputeShader(CharString p_name, Vector<UniformSet> p_sets, MDLibrary *p_kernel);
+	MDComputeShader(CharString p_name, Vector<UniformSet> p_sets, bool p_uses_argument_buffers, MDLibrary *p_kernel);
 };
 
 class API_AVAILABLE(macos(11.0), ios(14.0)) MDRenderShader final : public MDShader {
@@ -746,8 +747,9 @@ class API_AVAILABLE(macos(11.0), ios(14.0)) MDRenderShader final : public MDShad
 	void encode_push_constant_data(VectorView<uint32_t> p_data, MDCommandBuffer *p_cb) final;
 
 	MDRenderShader(CharString p_name,
-			bool p_needs_view_mask_buffer,
 			Vector<UniformSet> p_sets,
+			bool p_needs_view_mask_buffer,
+			bool p_uses_argument_buffers,
 			MDLibrary *p_vert, MDLibrary *p_frag);
 };
 
@@ -783,12 +785,21 @@ struct BoundUniformSet {
 };
 
 class API_AVAILABLE(macos(11.0), ios(14.0)) MDUniformSet {
+private:
+	void bind_uniforms_argument_buffers(MDShader *p_shader, MDCommandBuffer::RenderState &p_state);
+	void bind_uniforms_direct(MDShader *p_shader, MDCommandBuffer::RenderState &p_state);
+	void bind_uniforms_argument_buffers(MDShader *p_shader, MDCommandBuffer::ComputeState &p_state);
+	void bind_uniforms_direct(MDShader *p_shader, MDCommandBuffer::ComputeState &p_state);
+
 public:
 	uint32_t index;
 	LocalVector<RDD::BoundUniform> uniforms;
 	HashMap<MDShader *, BoundUniformSet> bound_uniforms;
 
-	BoundUniformSet &boundUniformSetForShader(MDShader *p_shader, id<MTLDevice> p_device);
+	void bind_uniforms(MDShader *p_shader, MDCommandBuffer::RenderState &p_state);
+	void bind_uniforms(MDShader *p_shader, MDCommandBuffer::ComputeState &p_state);
+
+	BoundUniformSet &bound_uniform_set(MDShader *p_shader, id<MTLDevice> p_device, ResourceUsageMap &p_resource_usage);
 };
 
 class API_AVAILABLE(macos(11.0), ios(14.0)) MDPipeline {