Reworked conditional rendering example, using complex glTF model

examples/conditionalrender/conditionalrender.cpp

@@ -3,8 +3,8 @@
 *
 * Note: Requires a device that supports the VK_EXT_conditional_rendering extension
 *
-* With conditional rendering it's possible to execute certain rendering commands based
+* With conditional rendering it's possible to execute certain rendering commands based on a buffer value instead of having to rebuild the command buffers.
-* on a buffer value instead of having to rebuild the command buffers.
+* This example sets up a conditonal buffer with one value per glTF part, that is used to toggle visibility of single model parts.
 *
 * Copyright (C) 2018 by Sascha Willems - www.saschawillems.de
 *
@@ -24,26 +24,17 @@
 
 #include <vulkan/vulkan.h>
 #include "vulkanexamplebase.h"
-#include "VulkanModel.hpp"
+#include "VulkanglTFModel.hpp"
 
 #define ENABLE_VALIDATION false
-#define MODEL_ROWS 3
 
 class VulkanExample : public VulkanExampleBase
 {
 public:
 	PFN_vkCmdBeginConditionalRenderingEXT vkCmdBeginConditionalRenderingEXT;
 	PFN_vkCmdEndConditionalRenderingEXT vkCmdEndConditionalRenderingEXT;
-	VkPhysicalDeviceConditionalRenderingFeaturesEXT conditionalRenderingFeatures{};
 
-	// Vertex layout for the models
+	vkglTF::Model scene;
-	vks::VertexLayout vertexLayout = vks::VertexLayout({
-		vks::VERTEX_COMPONENT_POSITION,
-		vks::VERTEX_COMPONENT_NORMAL,
-		vks::VERTEX_COMPONENT_COLOR,
-	});
-
-	vks::Model model;
 
 	struct {
 		glm::mat4 projection;
@@ -52,7 +43,7 @@ public:
 
 	vks::Buffer uniformBuffer;
 
-	std::array<int32_t, MODEL_ROWS> conditionalVisibility{};
+	std::vector<int32_t> conditionalVisibility;
 	vks::Buffer conditionalBuffer;
 
 	VkPipelineLayout pipelineLayout;
@@ -65,47 +56,75 @@ public:
 		title = "Conditional rendering";
 		settings.overlay = true;
 		camera.type = Camera::CameraType::lookat;
-		camera.setPerspective(60.0f, (float)width / (float)height, 0.1f, 512.0f);
+		camera.setPerspective(45.0f, (float)width / (float)height, 0.1f, 512.0f);
-		camera.setRotation(glm::vec3(0.0f, 0.0f, 0.0f));
+		camera.setRotation(glm::vec3(-9.0f, -55.0f, 0.0f));
-		camera.setTranslation(glm::vec3(0.0f, 0.0f, -15.0f));
+		camera.setTranslation(glm::vec3(3.45f, 3.15f, -22.0f));
-		rotationSpeed *= 0.25f;
+		camera.rotationSpeed *= 0.25f;
 
-		// Enable extension required for conditional rendering
+		/*
+			[POI] Enable extension required for conditional rendering
+		*/
 		enabledDeviceExtensions.push_back(VK_EXT_CONDITIONAL_RENDERING_EXTENSION_NAME);
-		// Enable extension required to get conditional rendering supported features
-		enabledInstanceExtensions.push_back(VK_KHR_GET_PHYSICAL_DEVICE_PROPERTIES_2_EXTENSION_NAME);
 	}
 
 	~VulkanExample()
 	{
-		// Clean up used Vulkan resources 
-		// Note : Inherited destructor cleans up resources stored in base class
 		vkDestroyPipeline(device, pipeline, nullptr);
 		vkDestroyPipelineLayout(device, pipelineLayout, nullptr);
 		vkDestroyDescriptorSetLayout(device, descriptorSetLayout, nullptr);
-		model.destroy();
 		uniformBuffer.destroy();
 		conditionalBuffer.destroy();
 	}
 
-	// Enable physical device features required for this example				
+	void renderNode(vkglTF::Node *node, VkCommandBuffer commandBuffer) {
-	virtual void getEnabledFeatures()
+		if (node->mesh) {
-	{
+			for (vkglTF::Primitive * primitive : node->mesh->primitives) {
-		// Geometry shader support is required for this example
+				const std::vector<VkDescriptorSet> descriptorsets = {
-		if (deviceFeatures.geometryShader) {
+					descriptorSet,
-			enabledFeatures.geometryShader = VK_TRUE;
+					node->mesh->uniformBuffer.descriptorSet
+				};
+				vkCmdBindDescriptorSets(commandBuffer, VK_PIPELINE_BIND_POINT_GRAPHICS, pipelineLayout, 0, static_cast<uint32_t>(descriptorsets.size()), descriptorsets.data(), 0, NULL);
+				
+				struct PushBlock {
+					glm::vec4 baseColorFactor;
+				} pushBlock;
+				pushBlock.baseColorFactor = primitive->material.baseColorFactor;
+
+				vkCmdPushConstants(commandBuffer, pipelineLayout, VK_SHADER_STAGE_FRAGMENT_BIT, 0, sizeof(PushBlock), &pushBlock);
+
+				/*
+					[POI] Setup the conditional rendering
+				*/
+				VkConditionalRenderingBeginInfoEXT conditionalRenderingBeginInfo{};
+				conditionalRenderingBeginInfo.sType = VK_STRUCTURE_TYPE_CONDITIONAL_RENDERING_BEGIN_INFO_EXT;
+				conditionalRenderingBeginInfo.buffer = conditionalBuffer.buffer;
+				conditionalRenderingBeginInfo.offset = sizeof(int32_t) * node->index;
+
+				/*
+					[POI] Begin conditionally rendered section
+
+					If the value from the conditional rendering buffer at the given offset is != 0, the draw commands will be executed
+				*/
+				vkCmdBeginConditionalRenderingEXT(commandBuffer, &conditionalRenderingBeginInfo);
+
+				vkCmdDrawIndexed(commandBuffer, primitive->indexCount, 1, primitive->firstIndex, 0, 0);
+
+				vkCmdEndConditionalRenderingEXT(commandBuffer);
 			}
-		else {
+
-			vks::tools::exitFatal("Selected GPU does not support geometry shaders!", VK_ERROR_FEATURE_NOT_PRESENT);
+		};
+		for (auto child : node->children) {
+			renderNode(child, commandBuffer);
 		}
 	}
 
+
 	void buildCommandBuffers()
 	{
 		VkCommandBufferBeginInfo cmdBufInfo = vks::initializers::commandBufferBeginInfo();
 
 		VkClearValue clearValues[2];
-		clearValues[0].color = { { 0.0f, 0.0f, 0.0f, 0.0f } };
+		clearValues[0].color = { { 1.0f, 1.0f, 1.0f, 1.0f } };
 		clearValues[1].depthStencil = { 1.0f, 0 };
 
 		VkRenderPassBeginInfo renderPassBeginInfo = vks::initializers::renderPassBeginInfo();
@@ -117,9 +136,7 @@ public:
 		renderPassBeginInfo.clearValueCount = 2;
 		renderPassBeginInfo.pClearValues = clearValues;
 
-		for (int32_t i = 0; i < drawCmdBuffers.size(); ++i)
+		for (int32_t i = 0; i < drawCmdBuffers.size(); ++i) {
-		{
-			// Set target frame buffer
 			renderPassBeginInfo.framebuffer = frameBuffers[i];
 
 			VK_CHECK_RESULT(vkBeginCommandBuffer(drawCmdBuffers[i], &cmdBufInfo));
@@ -133,49 +150,13 @@ public:
 
 			vkCmdBindDescriptorSets(drawCmdBuffers[i], VK_PIPELINE_BIND_POINT_GRAPHICS, pipelineLayout, 0, 1, &descriptorSet, 0, NULL);
 
-			VkDeviceSize offsets[1] = { 0 };
-			vkCmdBindVertexBuffers(drawCmdBuffers[i], 0, 1, &model.vertices.buffer, offsets);
-			vkCmdBindIndexBuffer(drawCmdBuffers[i], model.indices.buffer, 0, VK_INDEX_TYPE_UINT32);
-
-			struct PushBlock {
-				glm::vec4 offset;
-				glm::vec4 color;
-			} pushBlock;
-
-			const std::array<glm::vec3, 3> colors = {
-				glm::vec3(1.0f, 0.0f, 0.0f),
-				glm::vec3(0.0f, 1.0f, 0.0f),
-				glm::vec3(0.0f, 0.0f, 1.0f),
-			};
-
-			/*
-				[POI] Setup the conditional rendering structure that decides on wether the commands are rendered or discarded
-			*/
-			VkConditionalRenderingBeginInfoEXT conditionalRenderingBeginInfo{};
-			conditionalRenderingBeginInfo.sType = VK_STRUCTURE_TYPE_CONDITIONAL_RENDERING_BEGIN_INFO_EXT;
-			// If the value in this buffer at the given offset is zero, commands are discadrd
-			conditionalRenderingBeginInfo.buffer = conditionalBuffer.buffer;
-			// Offset will be changed in the loop below to toggle visibility of whole rows
-			conditionalRenderingBeginInfo.offset = 0;
-
 			vkCmdBindPipeline(drawCmdBuffers[i], VK_PIPELINE_BIND_POINT_GRAPHICS, pipeline);
-			for (int32_t x = -1; x < MODEL_ROWS - 1; x++) {
-				for (int32_t y = -2; y < 3; y++) {
-					pushBlock.offset = glm::vec4((float)x * 3.0f, (float)y * 2.5f, 0.0f, 1.0f);
-					pushBlock.color = glm::vec4(colors[x+1], 1.0f);
 				
-					/*
+			const VkDeviceSize offsets[1] = { 0 };
-						[POI] Start the conditionally rendered part (for this row)
+			vkCmdBindVertexBuffers(drawCmdBuffers[i], 0, 1, &scene.vertices.buffer, offsets);
-					*/
+			vkCmdBindIndexBuffer(drawCmdBuffers[i], scene.indices.buffer, 0, VK_INDEX_TYPE_UINT32);
-
+			for (auto node : scene.nodes) {
-					conditionalRenderingBeginInfo.offset = sizeof(uint32_t) * (x + 1);
+				renderNode(node, drawCmdBuffers[i]);
-					vkCmdBeginConditionalRenderingEXT(drawCmdBuffers[i], &conditionalRenderingBeginInfo);
-
-					vkCmdPushConstants(drawCmdBuffers[i], pipelineLayout, VK_SHADER_STAGE_VERTEX_BIT, 0, sizeof(pushBlock), &pushBlock);
-					vkCmdDrawIndexed(drawCmdBuffers[i], model.indexCount, 1, 0, 0, 0);
-
-					vkCmdEndConditionalRenderingEXT(drawCmdBuffers[i]);
-				}
 			}
 
 			vkCmdEndRenderPass(drawCmdBuffers[i]);
@@ -186,7 +167,7 @@ public:
 
 	void loadAssets()
 	{
-		model.loadFromFile(getAssetPath() + "models/suzanne.obj", vertexLayout, 0.1f, vulkanDevice, queue);
+		scene.loadFromFile(getAssetPath() + "models/Buggy.gltf", vulkanDevice, queue);
 	}
 
 	void setupDescriptorSets()
@@ -206,7 +187,10 @@ public:
 		descriptorLayoutCI.pBindings = setLayoutBindings.data();
 		VK_CHECK_RESULT(vkCreateDescriptorSetLayout(device, &descriptorLayoutCI, nullptr, &descriptorSetLayout));
 
-		VkPipelineLayoutCreateInfo pipelineLayoutCI = vks::initializers::pipelineLayoutCreateInfo(&descriptorSetLayout, 1);
+		std::array<VkDescriptorSetLayout, 2> setLayouts = {
+			descriptorSetLayout, scene.descriptorSetLayout
+		};
+		VkPipelineLayoutCreateInfo pipelineLayoutCI = vks::initializers::pipelineLayoutCreateInfo(setLayouts.data(), 2);
 		VkPushConstantRange pushConstantRange = vks::initializers::pushConstantRange(VK_SHADER_STAGE_VERTEX_BIT, sizeof(glm::vec4) * 2,	0);
 		pipelineLayoutCI.pushConstantRangeCount = 1;
 		pipelineLayoutCI.pPushConstantRanges = &pushConstantRange;
@@ -225,7 +209,7 @@ public:
 		const std::vector<VkDynamicState> dynamicStateEnables = { VK_DYNAMIC_STATE_VIEWPORT, VK_DYNAMIC_STATE_SCISSOR };
 
 		VkPipelineInputAssemblyStateCreateInfo inputAssemblyStateCI = vks::initializers::pipelineInputAssemblyStateCreateInfo(VK_PRIMITIVE_TOPOLOGY_TRIANGLE_LIST, 0, VK_FALSE);
-		VkPipelineRasterizationStateCreateInfo rasterizationStateCI = vks::initializers::pipelineRasterizationStateCreateInfo(VK_POLYGON_MODE_FILL, VK_CULL_MODE_BACK_BIT, VK_FRONT_FACE_CLOCKWISE, 0);
+		VkPipelineRasterizationStateCreateInfo rasterizationStateCI = vks::initializers::pipelineRasterizationStateCreateInfo(VK_POLYGON_MODE_FILL, VK_CULL_MODE_BACK_BIT, VK_FRONT_FACE_COUNTER_CLOCKWISE, 0);
 		VkPipelineColorBlendAttachmentState blendAttachmentState = vks::initializers::pipelineColorBlendAttachmentState(0xf, VK_FALSE);
 		VkPipelineColorBlendStateCreateInfo colorBlendStateCI = vks::initializers::pipelineColorBlendStateCreateInfo(1, &blendAttachmentState);
 		VkPipelineDepthStencilStateCreateInfo depthStencilStateCI = vks::initializers::pipelineDepthStencilStateCreateInfo(VK_TRUE, VK_TRUE, VK_COMPARE_OP_LESS_OR_EQUAL);
@@ -235,12 +219,12 @@ public:
 
 		// Vertex bindings and attributes
 		const std::vector<VkVertexInputBindingDescription> vertexInputBindings = {
-			vks::initializers::vertexInputBindingDescription(0, vertexLayout.stride(), VK_VERTEX_INPUT_RATE_VERTEX),
+			vks::initializers::vertexInputBindingDescription(0, sizeof(vkglTF::Model::Vertex), VK_VERTEX_INPUT_RATE_VERTEX),
 		};
 		const std::vector<VkVertexInputAttributeDescription> vertexInputAttributes = {
 			vks::initializers::vertexInputAttributeDescription(0, 0, VK_FORMAT_R32G32B32_SFLOAT, 0),					// Location 0: Position			
 			vks::initializers::vertexInputAttributeDescription(0, 1, VK_FORMAT_R32G32B32_SFLOAT, sizeof(float) * 3),	// Location 1: Normal
-			vks::initializers::vertexInputAttributeDescription(0, 2, VK_FORMAT_R32G32B32_SFLOAT, sizeof(float) * 6),	// Location 3: Color
+			vks::initializers::vertexInputAttributeDescription(0, 2, VK_FORMAT_R32G32_SFLOAT, sizeof(float) * 6),		// Location 2: UV
 		};
 		VkPipelineVertexInputStateCreateInfo vertexInputState = vks::initializers::pipelineVertexInputStateCreateInfo();
 		vertexInputState.vertexBindingDescriptionCount = static_cast<uint32_t>(vertexInputBindings.size());
@@ -283,41 +267,25 @@ public:
 	void updateUniformBuffers()
 	{
 		uboVS.projection = camera.matrices.perspective;
-		uboVS.modelview = camera.matrices.view;
+		uboVS.modelview = glm::scale(camera.matrices.view, glm::vec3(0.1f , -0.1f, 0.1f));
 		memcpy(uniformBuffer.mapped, &uboVS, sizeof(uboVS));
 	}
 
 	void updateConditionalBuffer()
 	{
-		memcpy(conditionalBuffer.mapped, &conditionalVisibility, sizeof(conditionalVisibility));
+		memcpy(conditionalBuffer.mapped, conditionalVisibility.data(), sizeof(int32_t) * conditionalVisibility.size());
 	}
 
-	void draw()
-	{
-		VulkanExampleBase::prepareFrame();
-
-		// Command buffer to be sumitted to the queue
-		submitInfo.commandBufferCount = 1;
-		submitInfo.pCommandBuffers = &drawCmdBuffers[currentBuffer];
-
-		// Submit to queue
-		VK_CHECK_RESULT(vkQueueSubmit(queue, 1, &submitInfo, VK_NULL_HANDLE));
-
-		VulkanExampleBase::submitFrame();
-	}
-
-	void prepare()
-	{
-		VulkanExampleBase::prepare();
-
 	/*
-			Extension specific functions
+		[POI] Extension specific setup
+
+		Gets the function pointers required for conditonal rendering
+		Sets up a dedicated conditional buffer that is used to determine visibility at draw time
 	*/
-
+	void prepareConditionalRendering()
+	{
 		/*
-			Get the function pointer
+			The conditional rendering functions are part of an extension so they have to be loaded manually
-			
-			The conditional rendering functions are part of an extension so they have to be manually loaded 
 		*/
 		vkCmdBeginConditionalRenderingEXT = (PFN_vkCmdBeginConditionalRenderingEXT)vkGetDeviceProcAddr(device, "vkCmdBeginConditionalRenderingEXT");
 		if (!vkCmdBeginConditionalRenderingEXT) {
@@ -329,45 +297,46 @@ public:
 			vks::tools::exitFatal("Could not get a valid function pointer for vkCmdEndConditionalRenderingEXT", -1);
 		}
 
-		/*
-			Get conditional rendering features
-		*/
-		PFN_vkGetPhysicalDeviceFeatures2KHR vkGetPhysicalDeviceFeatures2KHR = reinterpret_cast<PFN_vkGetPhysicalDeviceFeatures2KHR>(vkGetInstanceProcAddr(instance, "vkGetPhysicalDeviceFeatures2KHR"));
-		if (!vkGetPhysicalDeviceFeatures2KHR) {
-			vks::tools::exitFatal("Could not get a valid function pointer for vkGetPhysicalDeviceFeatures2KHR", -1);
-		}
-		VkPhysicalDeviceFeatures2KHR deviceFeatures2{};
-		conditionalRenderingFeatures.sType = VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_CONDITIONAL_RENDERING_FEATURES_EXT;
-		deviceFeatures2.sType = VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_FEATURES_2_KHR;
-		deviceFeatures2.pNext = &conditionalRenderingFeatures;
-		vkGetPhysicalDeviceFeatures2KHR(physicalDevice, &deviceFeatures2);
-
 		/*
 			Create the buffer that contains the conditional rendering information
 
 			A single conditional value is 32 bits and if it's zero the rendering commands are discarded
 			This sample renders multiple rows of objects conditionally, so we setup a buffer with one value per row
 		*/
+		conditionalVisibility.resize(scene.linearNodes.size());
 		VK_CHECK_RESULT(vulkanDevice->createBuffer(
 			VK_BUFFER_USAGE_CONDITIONAL_RENDERING_BIT_EXT,
 			VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT,
 			&conditionalBuffer,
-			sizeof(uint32_t) * MODEL_ROWS));
+			sizeof(int32_t) *conditionalVisibility.size(),
+			conditionalVisibility.data()));
+		VK_CHECK_RESULT(conditionalBuffer.map());
+
+		// By default, all parts of the glTF are visible
+		for (auto i = 0; i < conditionalVisibility.size(); i++) {
+			conditionalVisibility[i] = 1;
+		}
 
 		/*
 			Copy visibility data
 		*/
-		for (auto i = 0; i < conditionalVisibility.size(); i++) {
+		updateConditionalBuffer();
-			conditionalVisibility[i] = 1;
 	}
-		VK_CHECK_RESULT(conditionalBuffer.map());
-		memcpy(conditionalBuffer.mapped, &conditionalVisibility, sizeof(conditionalVisibility));
 
-		/*
+	void draw()
-			End of extension specific functions
+	{
-		*/
+		VulkanExampleBase::prepareFrame();
+		submitInfo.commandBufferCount = 1;
+		submitInfo.pCommandBuffers = &drawCmdBuffers[currentBuffer];
+		VK_CHECK_RESULT(vkQueueSubmit(queue, 1, &submitInfo, VK_NULL_HANDLE));
+		VulkanExampleBase::submitFrame();
+	}
 
+	void prepare()
+	{
+		VulkanExampleBase::prepare();
 		loadAssets();
+		prepareConditionalRendering();
 		prepareUniformBuffers();
 		setupDescriptorSets();
 		preparePipelines();
@@ -380,29 +349,41 @@ public:
 		if (!prepared)
 			return;
 		draw();
-	}
+		if (camera.updated) {
-
-	virtual void viewChanged()
-	{
 			updateUniformBuffers();
 		}
+	}
 
 	virtual void OnUpdateUIOverlay(vks::UIOverlay *overlay)
 	{
 		if (overlay->header("Visibility")) {
-			for (uint32_t i = 0; i < MODEL_ROWS; i++) {
+
-				if (overlay->checkBox(std::to_string(i).c_str(), &conditionalVisibility[i])) {
+			if (overlay->button("All")) {
+				for (auto i = 0; i < conditionalVisibility.size(); i++) {
+					conditionalVisibility[i] = 1;
+				}
+				updateConditionalBuffer();
+			}
+			ImGui::SameLine();
+			if (overlay->button("None")) {
+				for (auto i = 0; i < conditionalVisibility.size(); i++) {
+					conditionalVisibility[i] = 0;
+				}
+				updateConditionalBuffer();
+			}
+			ImGui::NewLine();
+
+			for (auto node : scene.linearNodes) {
+				// Add visibility toggle checkboxes for all model nodes with a mesh
+				if (node->mesh) {
+					if (overlay->checkBox(("[" + std::to_string(node->index) + "] " + node->mesh->name).c_str(), &conditionalVisibility[node->index])) {
 						updateConditionalBuffer();
-				};
-				if (i < MODEL_ROWS - 1) { ImGui::SameLine(); };
 					}
 				}
-		if (overlay->header("Device properties")) {
-			overlay->text("conditional rendering: %s", conditionalRenderingFeatures.conditionalRendering ? "true" : "false");
-			overlay->text("inherited conditional rendering: %s", conditionalRenderingFeatures.inheritedConditionalRendering ? "true" : "false");
 			}
 
 		}
+	}
 
 };