Check for Vulkan Memory Model support and make it a variant.

DarioSamo · DarioSamo · commit b962b38e74a2 · 2025-07-25T09:24:58.000-03:00
diff --git a/drivers/d3d12/rendering_device_driver_d3d12.cpp b/drivers/d3d12/rendering_device_driver_d3d12.cpp
@@ -5588,6 +5588,8 @@ bool RenderingDeviceDriverD3D12::has_feature(Features p_feature) {
 			return true;
 		case SUPPORTS_IMAGE_ATOMIC_32_BIT:
 			return true;
+		case SUPPORTS_VULKAN_MEMORY_MODEL:
+			return false;
 		default:
 			return false;
 	}
diff --git a/drivers/metal/rendering_device_driver_metal.mm b/drivers/metal/rendering_device_driver_metal.mm
@@ -2743,6 +2743,8 @@ bool isArrayTexture(MTLTextureType p_type) {
 			return device_properties->features.metal_fx_temporal;
 		case SUPPORTS_IMAGE_ATOMIC_32_BIT:
 			return device_properties->features.supports_native_image_atomics;
+		case SUPPORTS_VULKAN_MEMORY_MODEL:
+			return true;
 		default:
 			return false;
 	}
diff --git a/drivers/vulkan/rendering_device_driver_vulkan.cpp b/drivers/vulkan/rendering_device_driver_vulkan.cpp
@@ -533,6 +533,7 @@ Error RenderingDeviceDriverVulkan::_initialize_device_extensions() {
 	_register_requested_device_extension(VK_EXT_SUBGROUP_SIZE_CONTROL_EXTENSION_NAME, false);
 	_register_requested_device_extension(VK_EXT_ASTC_DECODE_MODE_EXTENSION_NAME, false);
 	_register_requested_device_extension(VK_KHR_BUFFER_DEVICE_ADDRESS_EXTENSION_NAME, false);
+	_register_requested_device_extension(VK_KHR_VULKAN_MEMORY_MODEL_EXTENSION_NAME, false);
 	_register_requested_device_extension(VK_EXT_TEXTURE_COMPRESSION_ASTC_HDR_EXTENSION_NAME, false);
 
 	// We don't actually use this extension, but some runtime components on some platforms
@@ -756,6 +757,7 @@ Error RenderingDeviceDriverVulkan::_check_device_capabilities() {
 		VkPhysicalDeviceVulkan12Features device_features_vk_1_2 = {};
 		VkPhysicalDeviceShaderFloat16Int8FeaturesKHR shader_features = {};
 		VkPhysicalDeviceBufferDeviceAddressFeaturesKHR buffer_device_address_features = {};
+		VkPhysicalDeviceVulkanMemoryModelFeaturesKHR vulkan_memory_model_features = {};
 		VkPhysicalDeviceFragmentShadingRateFeaturesKHR fsr_features = {};
 		VkPhysicalDeviceFragmentDensityMapFeaturesEXT fdm_features = {};
 		VkPhysicalDevice16BitStorageFeaturesKHR storage_feature = {};
@@ -778,6 +780,11 @@ Error RenderingDeviceDriverVulkan::_check_device_capabilities() {
 				buffer_device_address_features.pNext = next_features;
 				next_features = &buffer_device_address_features;
 			}
+			if (enabled_device_extension_names.has(VK_KHR_VULKAN_MEMORY_MODEL_EXTENSION_NAME)) {
+				vulkan_memory_model_features.sType = VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_VULKAN_MEMORY_MODEL_FEATURES_KHR;
+				vulkan_memory_model_features.pNext = next_features;
+				next_features = &vulkan_memory_model_features;
+			}
 		}
 
 		if (enabled_device_extension_names.has(VK_KHR_FRAGMENT_SHADING_RATE_EXTENSION_NAME)) {
@@ -826,6 +833,10 @@ Error RenderingDeviceDriverVulkan::_check_device_capabilities() {
 			if (enabled_device_extension_names.has(VK_KHR_BUFFER_DEVICE_ADDRESS_EXTENSION_NAME)) {
 				buffer_device_address_support = device_features_vk_1_2.bufferDeviceAddress;
 			}
+			if (enabled_device_extension_names.has(VK_KHR_VULKAN_MEMORY_MODEL_EXTENSION_NAME)) {
+				vulkan_memory_model_support = device_features_vk_1_2.vulkanMemoryModel;
+				vulkan_memory_model_device_scope_support = device_features_vk_1_2.vulkanMemoryModelDeviceScope;
+			}
 		} else {
 			if (enabled_device_extension_names.has(VK_KHR_SHADER_FLOAT16_INT8_EXTENSION_NAME)) {
 				shader_capabilities.shader_float16_is_supported = shader_features.shaderFloat16;
@@ -834,6 +845,10 @@ Error RenderingDeviceDriverVulkan::_check_device_capabilities() {
 			if (enabled_device_extension_names.has(VK_KHR_BUFFER_DEVICE_ADDRESS_EXTENSION_NAME)) {
 				buffer_device_address_support = buffer_device_address_features.bufferDeviceAddress;
 			}
+			if (enabled_device_extension_names.has(VK_KHR_VULKAN_MEMORY_MODEL_EXTENSION_NAME)) {
+				vulkan_memory_model_support = vulkan_memory_model_features.vulkanMemoryModel;
+				vulkan_memory_model_device_scope_support = vulkan_memory_model_features.vulkanMemoryModelDeviceScope;
+			}
 		}
 
 		if (enabled_device_extension_names.has(VK_KHR_FRAGMENT_SHADING_RATE_EXTENSION_NAME)) {
@@ -1078,6 +1093,15 @@ Error RenderingDeviceDriverVulkan::_initialize_device(const LocalVector<VkDevice
 		create_info_next = &buffer_device_address_features;
 	}
 
+	VkPhysicalDeviceVulkanMemoryModelFeaturesKHR vulkan_memory_model_features = {};
+	if (vulkan_memory_model_support && vulkan_memory_model_device_scope_support) {
+		vulkan_memory_model_features.sType = VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_VULKAN_MEMORY_MODEL_FEATURES_KHR;
+		vulkan_memory_model_features.pNext = create_info_next;
+		vulkan_memory_model_features.vulkanMemoryModel = vulkan_memory_model_support;
+		vulkan_memory_model_features.vulkanMemoryModelDeviceScope = vulkan_memory_model_device_scope_support;
+		create_info_next = &vulkan_memory_model_features;
+	}
+
 	VkPhysicalDeviceFragmentShadingRateFeaturesKHR fsr_features = {};
 	if (fsr_capabilities.pipeline_supported || fsr_capabilities.primitive_supported || fsr_capabilities.attachment_supported) {
 		fsr_features.sType = VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_FRAGMENT_SHADING_RATE_FEATURES_KHR;
@@ -5901,6 +5925,8 @@ bool RenderingDeviceDriverVulkan::has_feature(Features p_feature) {
 #else
 			return true;
 #endif
+		case SUPPORTS_VULKAN_MEMORY_MODEL:
+			return vulkan_memory_model_support && vulkan_memory_model_device_scope_support;
 		default:
 			return false;
 	}
diff --git a/drivers/vulkan/rendering_device_driver_vulkan.h b/drivers/vulkan/rendering_device_driver_vulkan.h
@@ -133,6 +133,8 @@ class RenderingDeviceDriverVulkan : public RenderingDeviceDriver {
 	StorageBufferCapabilities storage_buffer_capabilities;
 	RenderingShaderContainerFormatVulkan shader_container_format;
 	bool buffer_device_address_support = false;
+	bool vulkan_memory_model_support = false;
+	bool vulkan_memory_model_device_scope_support = false;
 	bool pipeline_cache_control_support = false;
 	bool device_fault_support = false;
 #if defined(VK_TRACK_DEVICE_MEMORY)
diff --git a/servers/rendering/renderer_rd/environment/fog.cpp b/servers/rendering/renderer_rd/environment/fog.cpp
@@ -47,22 +47,29 @@ Fog::~Fog() {
 	singleton = nullptr;
 }
 
-int Fog::_get_fog_variant() {
+int Fog::_get_fog_shader_group() {
 	RenderingDevice *rd = RD::get_singleton();
-	if (rd->has_feature(RD::SUPPORTS_IMAGE_ATOMIC_32_BIT)) {
-		return 0;
+	bool use_32_bit_atomics = rd->has_feature(RD::SUPPORTS_IMAGE_ATOMIC_32_BIT);
+	bool use_vulkan_memory_model = rd->has_feature(RD::SUPPORTS_VULKAN_MEMORY_MODEL);
+	if (use_vulkan_memory_model) {
+		return use_32_bit_atomics ? VolumetricFogShader::SHADER_GROUP_VULKAN_MEMORY_MODEL : VolumetricFogShader::SHADER_GROUP_VULKAN_MEMORY_MODEL_NO_ATOMICS;
 	} else {
-		return 1;
+		return use_32_bit_atomics ? VolumetricFogShader::SHADER_GROUP_BASE : VolumetricFogShader::SHADER_GROUP_NO_ATOMICS;
 	}
 }
 
+int Fog::_get_fog_variant() {
+	RenderingDevice *rd = RD::get_singleton();
+	bool use_32_bit_atomics = rd->has_feature(RD::SUPPORTS_IMAGE_ATOMIC_32_BIT);
+	bool use_vulkan_memory_model = rd->has_feature(RD::SUPPORTS_VULKAN_MEMORY_MODEL);
+	return (use_vulkan_memory_model ? 2 : 0) + (use_32_bit_atomics ? 0 : 1);
+}
+
 int Fog::_get_fog_process_variant(int p_idx) {
 	RenderingDevice *rd = RD::get_singleton();
-	if (rd->has_feature(RD::SUPPORTS_IMAGE_ATOMIC_32_BIT)) {
-		return p_idx;
-	} else {
-		return p_idx + VolumetricFogShader::VOLUMETRIC_FOG_PROCESS_SHADER_MAX;
-	}
+	bool use_32_bit_atomics = rd->has_feature(RD::SUPPORTS_IMAGE_ATOMIC_32_BIT);
+	bool use_vulkan_memory_model = rd->has_feature(RD::SUPPORTS_VULKAN_MEMORY_MODEL);
+	return (use_vulkan_memory_model ? (VolumetricFogShader::VOLUMETRIC_FOG_PROCESS_SHADER_MAX * 2) : 0) + (use_32_bit_atomics ? 0 : VolumetricFogShader::VOLUMETRIC_FOG_PROCESS_SHADER_MAX) + p_idx;
 }
 
 /* FOG VOLUMES */
@@ -210,18 +217,14 @@ void Fog::init_fog_shader(uint32_t p_max_directional_lights, int p_roughness_lay
 	{
 		String defines = "#define SAMPLERS_BINDING_FIRST_INDEX " + itos(SAMPLERS_BINDING_FIRST_INDEX) + "\n";
 		// Initialize local fog shader
-		Vector<String> volumetric_fog_modes;
-		volumetric_fog_modes.push_back("");
-		volumetric_fog_modes.push_back("#define NO_IMAGE_ATOMICS\n");
+		Vector<ShaderRD::VariantDefine> volumetric_fog_modes;
+		volumetric_fog_modes.push_back(ShaderRD::VariantDefine(VolumetricFogShader::SHADER_GROUP_BASE, "", false));
+		volumetric_fog_modes.push_back(ShaderRD::VariantDefine(VolumetricFogShader::SHADER_GROUP_NO_ATOMICS, "#define NO_IMAGE_ATOMICS\n", false));
+		volumetric_fog_modes.push_back(ShaderRD::VariantDefine(VolumetricFogShader::SHADER_GROUP_VULKAN_MEMORY_MODEL, "#define USE_VULKAN_MEMORY_MODEL\n", false));
+		volumetric_fog_modes.push_back(ShaderRD::VariantDefine(VolumetricFogShader::SHADER_GROUP_VULKAN_MEMORY_MODEL_NO_ATOMICS, "#define USE_VULKAN_MEMORY_MODEL\n#define NO_IMAGE_ATOMICS\n", false));
 
 		volumetric_fog.shader.initialize(volumetric_fog_modes, defines);
-
-		RenderingDevice *rd = RD::get_singleton();
-		if (rd->has_feature(RD::SUPPORTS_IMAGE_ATOMIC_32_BIT)) {
-			volumetric_fog.shader.set_variant_enabled(1, false);
-		} else {
-			volumetric_fog.shader.set_variant_enabled(0, false);
-		}
+		volumetric_fog.shader.enable_group(_get_fog_shader_group());
 
 		material_storage->shader_set_data_request_function(RendererRD::MaterialStorage::SHADER_TYPE_FOG, _create_fog_shader_funcs);
 		material_storage->material_set_data_request_function(RendererRD::MaterialStorage::SHADER_TYPE_FOG, _create_fog_material_funcs);
@@ -302,30 +305,24 @@ ALBEDO = vec3(1.0);
 		if (p_is_using_radiance_cubemap_array) {
 			defines += "\n#define USE_RADIANCE_CUBEMAP_ARRAY \n";
 		}
-		Vector<String> volumetric_fog_modes;
-		volumetric_fog_modes.push_back("\n#define MODE_DENSITY\n");
-		volumetric_fog_modes.push_back("\n#define MODE_DENSITY\n#define ENABLE_SDFGI\n");
-		volumetric_fog_modes.push_back("\n#define MODE_FILTER\n");
-		volumetric_fog_modes.push_back("\n#define MODE_FOG\n");
-		volumetric_fog_modes.push_back("\n#define MODE_COPY\n");
-
-		volumetric_fog_modes.push_back("\n#define MODE_DENSITY\n#define NO_IMAGE_ATOMICS\n");
-		volumetric_fog_modes.push_back("\n#define MODE_DENSITY\n#define ENABLE_SDFGI\n#define NO_IMAGE_ATOMICS\n");
-		volumetric_fog_modes.push_back("\n#define MODE_FILTER\n#define NO_IMAGE_ATOMICS\n");
-		volumetric_fog_modes.push_back("\n#define MODE_FOG\n#define NO_IMAGE_ATOMICS\n");
-		volumetric_fog_modes.push_back("\n#define MODE_COPY\n#define NO_IMAGE_ATOMICS\n");
-
-		volumetric_fog.process_shader.initialize(volumetric_fog_modes, defines);
-
-		RenderingDevice *rd = RD::get_singleton();
-		for (int i = 0; i < VolumetricFogShader::VOLUMETRIC_FOG_PROCESS_SHADER_MAX; i++) {
-			if (rd->has_feature(RD::SUPPORTS_IMAGE_ATOMIC_32_BIT)) {
-				volumetric_fog.process_shader.set_variant_enabled(i + VolumetricFogShader::VOLUMETRIC_FOG_PROCESS_SHADER_MAX, false);
-			} else {
-				volumetric_fog.process_shader.set_variant_enabled(i, false);
+		Vector<ShaderRD::VariantDefine> volumetric_fog_modes;
+		int shader_group = 0;
+		for (int vk_memory_model = 0; vk_memory_model < 2; vk_memory_model++) {
+			for (int no_atomics = 0; no_atomics < 2; no_atomics++) {
+				String base_define = vk_memory_model ? "\n#define USE_VULKAN_MEMORY_MODEL" : "";
+				base_define += no_atomics ? "\n#define NO_IMAGE_ATOMICS" : "";
+				volumetric_fog_modes.push_back(ShaderRD::VariantDefine(shader_group, base_define + "\n#define MODE_DENSITY\n", false));
+				volumetric_fog_modes.push_back(ShaderRD::VariantDefine(shader_group, base_define + "\n#define MODE_DENSITY\n#define ENABLE_SDFGI\n", false));
+				volumetric_fog_modes.push_back(ShaderRD::VariantDefine(shader_group, base_define + "\n#define MODE_FILTER\n", false));
+				volumetric_fog_modes.push_back(ShaderRD::VariantDefine(shader_group, base_define + "\n#define MODE_FOG\n", false));
+				volumetric_fog_modes.push_back(ShaderRD::VariantDefine(shader_group, base_define + "\n#define MODE_COPY\n", false));
+				shader_group++;
 			}
 		}
 
+		volumetric_fog.process_shader.initialize(volumetric_fog_modes, defines);
+		volumetric_fog.process_shader.enable_group(_get_fog_shader_group());
+
 		volumetric_fog.process_shader_version = volumetric_fog.process_shader.version_create();
 		for (int i = 0; i < VolumetricFogShader::VOLUMETRIC_FOG_PROCESS_SHADER_MAX; i++) {
 			volumetric_fog.process_pipelines[i] = RD::get_singleton()->compute_pipeline_create(volumetric_fog.process_shader.version_get_shader(volumetric_fog.process_shader_version, _get_fog_process_variant(i)));
diff --git a/servers/rendering/renderer_rd/environment/fog.h b/servers/rendering/renderer_rd/environment/fog.h
@@ -48,6 +48,7 @@ class Fog : public RendererFog {
 private:
 	static Fog *singleton;
 
+	static int _get_fog_shader_group();
 	static int _get_fog_variant();
 	static int _get_fog_process_variant(int p_idx);
 
@@ -76,6 +77,13 @@ class Fog : public RendererFog {
 
 	/* Volumetric Fog */
 	struct VolumetricFogShader {
+		enum ShaderGroup {
+			SHADER_GROUP_BASE,
+			SHADER_GROUP_NO_ATOMICS,
+			SHADER_GROUP_VULKAN_MEMORY_MODEL,
+			SHADER_GROUP_VULKAN_MEMORY_MODEL_NO_ATOMICS,
+		};
+
 		enum FogSet {
 			FOG_SET_BASE,
 			FOG_SET_UNIFORMS,
diff --git a/servers/rendering/renderer_rd/shaders/environment/volumetric_fog.glsl b/servers/rendering/renderer_rd/shaders/environment/volumetric_fog.glsl
@@ -2,10 +2,12 @@
 
 #version 450
 
-#pragma use_vulkan_memory_model
-
 #VERSION_DEFINES
 
+#ifdef USE_VULKAN_MEMORY_MODEL
+#pragma use_vulkan_memory_model
+#endif
+
 layout(local_size_x = 4, local_size_y = 4, local_size_z = 4) in;
 
 #define DENSITY_SCALE 1024.0
diff --git a/servers/rendering/renderer_rd/shaders/environment/volumetric_fog_process.glsl b/servers/rendering/renderer_rd/shaders/environment/volumetric_fog_process.glsl
@@ -2,10 +2,12 @@
 
 #version 450
 
-#pragma use_vulkan_memory_model
-
 #VERSION_DEFINES
 
+#ifdef USE_VULKAN_MEMORY_MODEL
+#pragma use_vulkan_memory_model
+#endif
+
 #ifdef MODE_DENSITY
 layout(local_size_x = 4, local_size_y = 4, local_size_z = 4) in;
 #else
diff --git a/servers/rendering/rendering_device_commons.h b/servers/rendering/rendering_device_commons.h
@@ -953,6 +953,7 @@ class RenderingDeviceCommons : public Object {
 		SUPPORTS_FRAGMENT_SHADER_WITH_ONLY_SIDE_EFFECTS,
 		SUPPORTS_BUFFER_DEVICE_ADDRESS,
 		SUPPORTS_IMAGE_ATOMIC_32_BIT,
+		SUPPORTS_VULKAN_MEMORY_MODEL,
 	};
 
 	enum SubgroupOperations {

Original file line number	Diff line number	Diff line change
`@@ -5588,6 +5588,8 @@ bool RenderingDeviceDriverD3D12::has_feature(Features p_feature) {`
`5588`	`5588`	`return true;`
`5589`	`5589`	`case SUPPORTS_IMAGE_ATOMIC_32_BIT:`
`5590`	`5590`	`return true;`
	`5591`	`+ case SUPPORTS_VULKAN_MEMORY_MODEL:`
	`5592`	`+ return false;`
`5591`	`5593`	`default:`
`5592`	`5594`	`return false;`
`5593`	`5595`	`}`
Original file line number	Diff line number	Diff line change
`@@ -2743,6 +2743,8 @@ bool isArrayTexture(MTLTextureType p_type) {`
`2743`	`2743`	`return device_properties->features.metal_fx_temporal;`
`2744`	`2744`	`case SUPPORTS_IMAGE_ATOMIC_32_BIT:`
`2745`	`2745`	`return device_properties->features.supports_native_image_atomics;`
	`2746`	`+ case SUPPORTS_VULKAN_MEMORY_MODEL:`
	`2747`	`+ return true;`
`2746`	`2748`	`default:`
`2747`	`2749`	`return false;`
`2748`	`2750`	`}`