Add slang shaders for headless samples

Author: SaschaWillems

examples/computeheadless/computeheadless.cpp

@@ -82,6 +82,8 @@ class VulkanExample
 
 	VkDebugReportCallbackEXT debugReportCallback{};
 
+	std::string shaderDir = "glsl";
+
 	VkResult createBuffer(VkBufferUsageFlags usageFlags, VkMemoryPropertyFlags memoryPropertyFlags, VkBuffer *buffer, VkDeviceMemory *memory, VkDeviceSize size, void *data = nullptr)
 	{
 		// Create the buffer handle
@@ -132,11 +134,19 @@ class VulkanExample
 		vks::android::loadVulkanLibrary();
 #endif
 
+		if (commandLineParser.isSet("shaders")) {
+			shaderDir = commandLineParser.getValueAsString("shaders", "glsl");
+		}
+
 		VkApplicationInfo appInfo = {};
 		appInfo.sType = VK_STRUCTURE_TYPE_APPLICATION_INFO;
 		appInfo.pApplicationName = "Vulkan headless example";
 		appInfo.pEngineName = "VulkanExample";
 		appInfo.apiVersion = VK_API_VERSION_1_0;
+		// Shaders generated by Slang require a certain SPIR-V environment that can't be satisfied by Vulkan 1.0, so we need to expliclity up that to at least 1.1 and enable some required extensions
+		if (shaderDir == "slang") {
+			appInfo.apiVersion = VK_API_VERSION_1_1;
+		}
 
 		/*
 			Vulkan instance creation (without surface extensions)
@@ -159,7 +169,7 @@ class VulkanExample
 		bool layersAvailable = true;
 		for (auto layerName : validationLayers) {
 			bool layerAvailable = false;
-			for (auto instanceLayer : instanceLayers) {
+			for (auto& instanceLayer : instanceLayers) {
 				if (strcmp(instanceLayer.layerName, layerName) == 0) {
 					layerAvailable = true;
 					break;
@@ -260,8 +270,15 @@ class VulkanExample
 		deviceCreateInfo.queueCreateInfoCount = 1;
 		deviceCreateInfo.pQueueCreateInfos = &queueCreateInfo;
 		std::vector<const char*> deviceExtensions = {};
+
+		// Shaders generated by Slang require a certain SPIR-V environment that can't be satisfied by Vulkan 1.0, so we need to expliclity up that to at least 1.1 and enable some required extensions
+		if (shaderDir == "slang") {
+			deviceExtensions.push_back(VK_KHR_SPIRV_1_4_EXTENSION_NAME);
+			deviceExtensions.push_back(VK_KHR_SHADER_FLOAT_CONTROLS_EXTENSION_NAME);
+		}
+
 #if (defined(VK_USE_PLATFORM_MACOS_MVK) || defined(VK_USE_PLATFORM_METAL_EXT)) && defined(VK_KHR_portability_subset)
-		// SRS - When running on macOS with MoltenVK and VK_KHR_portability_subset is defined and supported by the device, enable the extension
+		// When running on macOS with MoltenVK and VK_KHR_portability_subset is defined and supported by the device, enable the extension
 		uint32_t deviceExtCount = 0;
 		vkEnumerateDeviceExtensionProperties(physicalDevice, nullptr, &deviceExtCount, nullptr);
 		if (deviceExtCount > 0)
@@ -410,10 +427,6 @@ class VulkanExample
 			VkSpecializationMapEntry specializationMapEntry = vks::initializers::specializationMapEntry(0, 0, sizeof(uint32_t));
 			VkSpecializationInfo specializationInfo = vks::initializers::specializationInfo(1, &specializationMapEntry, sizeof(SpecializationData), &specializationData);
 
-			std::string shaderDir = "glsl";
-			if (commandLineParser.isSet("shaders")) {
-				shaderDir = commandLineParser.getValueAsString("shaders", "glsl");
-			}
 			const std::string shadersPath = getShaderBasePath() + shaderDir + "/computeheadless/";
 
 			VkPipelineShaderStageCreateInfo shaderStage = {};

examples/renderheadless/renderheadless.cpp

@@ -97,6 +97,8 @@ class VulkanExample
 
 	VkDebugReportCallbackEXT debugReportCallback{};
 
+	std::string shaderDir = "glsl";
+
 	uint32_t getMemoryTypeIndex(uint32_t typeBits, VkMemoryPropertyFlags properties) {
 		VkPhysicalDeviceMemoryProperties deviceMemoryProperties;
 		vkGetPhysicalDeviceMemoryProperties(physicalDevice, &deviceMemoryProperties);
@@ -163,11 +165,19 @@ class VulkanExample
 		vks::android::loadVulkanLibrary();
 #endif
 
+		if (commandLineParser.isSet("shaders")) {
+			shaderDir = commandLineParser.getValueAsString("shaders", "glsl");
+		}
+
 		VkApplicationInfo appInfo = {};
 		appInfo.sType = VK_STRUCTURE_TYPE_APPLICATION_INFO;
 		appInfo.pApplicationName = "Vulkan headless example";
 		appInfo.pEngineName = "VulkanExample";
 		appInfo.apiVersion = VK_API_VERSION_1_0;
+		// Shaders generated by Slang require a certain SPIR-V environment that can't be satisfied by Vulkan 1.0, so we need to expliclity up that to at least 1.1 and enable some required extensions
+		if (shaderDir == "slang") {
+			appInfo.apiVersion = VK_API_VERSION_1_1;
+		}
 
 		/*
 			Vulkan instance creation (without surface extensions)
@@ -190,7 +200,7 @@ class VulkanExample
 		bool layersAvailable = true;
 		for (auto layerName : validationLayers) {
 			bool layerAvailable = false;
-			for (auto instanceLayer : instanceLayers) {
+			for (auto& instanceLayer : instanceLayers) {
 				if (strcmp(instanceLayer.layerName, layerName) == 0) {
 					layerAvailable = true;
 					break;
@@ -290,8 +300,15 @@ class VulkanExample
 		deviceCreateInfo.queueCreateInfoCount = 1;
 		deviceCreateInfo.pQueueCreateInfos = &queueCreateInfo;
 		std::vector<const char*> deviceExtensions = {};
+
+		// Shaders generated by Slang require a certain SPIR-V environment that can't be satisfied by Vulkan 1.0, so we need to expliclity up that to at least 1.1 and enable some required extensions
+		if (shaderDir == "slang") {
+			deviceExtensions.push_back(VK_KHR_SPIRV_1_4_EXTENSION_NAME);
+			deviceExtensions.push_back(VK_KHR_SHADER_FLOAT_CONTROLS_EXTENSION_NAME);
+		}
+
 #if (defined(VK_USE_PLATFORM_MACOS_MVK) || defined(VK_USE_PLATFORM_METAL_EXT)) && defined(VK_KHR_portability_subset)
-		// SRS - When running on macOS with MoltenVK and VK_KHR_portability_subset is defined and supported by the device, enable the extension
+		// When running on macOS with MoltenVK and VK_KHR_portability_subset is defined and supported by the device, enable the extension
 		uint32_t deviceExtCount = 0;
 		vkEnumerateDeviceExtensionProperties(physicalDevice, nullptr, &deviceExtCount, nullptr);
 		if (deviceExtCount > 0)
@@ -643,7 +660,6 @@ class VulkanExample
 
 			pipelineCreateInfo.pVertexInputState = &vertexInputState;
 
-			std::string shaderDir = "glsl";
 			if (commandLineParser.isSet("shaders")) {
 				shaderDir = commandLineParser.getValueAsString("shaders", "glsl");
 			}

shaders/slang/computeheadless/headless.slang

@@ -0,0 +1,34 @@
+/* Copyright (c) 2025, Sascha Willems
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ */
+
+RWStructuredBuffer<uint> values;
+
+[[SpecializationConstant]] const uint BUFFER_ELEMENTS = 32;
+
+uint fibonacci(uint n) {
+	if(n <= 1){
+		return n;
+	}
+	uint curr = 1;
+	uint prev = 1;
+	for(uint i = 2; i < n; ++i) {
+		uint temp = curr;
+		curr += prev;
+		prev = temp;
+	}
+	return curr;
+}
+
+[numthreads(1, 1, 1)]
+[shader("compute")]
+void computeMain(uint3 GlobalInvocationID : SV_DispatchThreadID)
+{
+	uint index = GlobalInvocationID.x;
+	if (index >= BUFFER_ELEMENTS)
+		return;
+	values[index] = fibonacci(values[index]);
+}
+

shaders/slang/renderheadless/triangle.slang

@@ -0,0 +1,32 @@
+/* Copyright (c) 2025, Sascha Willems
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ */
+
+struct VSInput
+{
+    float3 Pos;
+    float3 Color;
+};
+
+struct VSOutput
+{
+    float4 Pos : SV_POSITION;
+    float3 Color;
+};
+
+[shader("vertex")]
+VSOutput vertexMain(VSInput input, uniform float4x4 mvp)
+{
+	VSOutput output;
+	output.Color = input.Color;
+	output.Pos = mul(mvp, float4(input.Pos.xyz, 1.0));
+	return output;
+}
+
+[shader("fragment")]
+float4 fragmentMain(VSOutput input)
+{
+	return float4(input.Color, 1.0);
+}