Started work on variable rate shading sample

examples/variablerateshading/variablerateshading.h

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+/*
+* Vulkan Example - Variable rate shading
+*
+* Copyright (C) 2020 by Sascha Willems - www.saschawillems.de
+*
+* This code is licensed under the MIT license (MIT) (http://opensource.org/licenses/MIT)
+*/
+
+#include "vulkanexamplebase.h"
+#include "VulkanglTFModel.h"
+
+#define ENABLE_VALIDATION false
+
+class VulkanExample : public VulkanExampleBase
+{
+public:
+	vkglTF::Model scene;
+
+	struct ShadingRateImage {
+		VkImage image;
+		VkDeviceMemory memory;
+		VkImageView view;
+	} shadingRateImage;
+
+	struct ShaderData {
+		vks::Buffer buffer;
+		struct Values {
+			glm::mat4 projection;
+			glm::mat4 view;
+			glm::mat4 model = glm::mat4(1.0f);
+			glm::vec4 lightPos = glm::vec4(0.0f, -2.5f, 0.0f, 1.0f);
+			glm::vec4 viewPos;
+		} values;
+	} shaderData;
+
+	VkPipeline pipeline;
+	VkPipelineLayout pipelineLayout;
+	VkDescriptorSet descriptorSet;
+	VkDescriptorSetLayout descriptorSetLayout;
+
+	VkPhysicalDeviceShadingRateImageFeaturesNV enabledPhysicalDeviceShadingRateImageFeaturesNV;
+	PFN_vkCmdBindShadingRateImageNV vkCmdBindShadingRateImageNV;
+
+	VulkanExample();
+	~VulkanExample();
+	virtual void getEnabledFeatures();
+	void buildCommandBuffers();
+	void loadglTFFile(std::string filename);
+	void loadAssets();
+	void prepareShadingRateImage();
+	void setupDescriptors();
+	void preparePipelines();
+	void prepareUniformBuffers();
+	void updateUniformBuffers();
+	void prepare();
+	virtual void render();
+	virtual void OnUpdateUIOverlay(vks::UIOverlay* overlay);
+};