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2025-09-04 10:54:47 +08:00
commit 6bc8f61b18
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+/* Copyright (c) 2023-2024, Sascha Willems
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 the "License";
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/*
+ * Using VK_EXT_conditional_rendering, which executes or discards draw commands based on values sourced from a buffer
+ */
+
+#pragma once
+
+#include "api_vulkan_sample.h"
+
+class ConditionalRendering : public ApiVulkanSample
+{
+  public:
+	std::unique_ptr<vkb::core::BufferC> vertex_buffer = nullptr;
+	std::unique_ptr<vkb::core::BufferC> index_buffer  = nullptr;
+
+	std::unique_ptr<vkb::sg::Scene> scene;
+	struct SceneNode
+	{
+		std::string       name;
+		vkb::sg::Node    *node;
+		vkb::sg::SubMesh *sub_mesh;
+	};
+	std::vector<SceneNode> linear_scene_nodes;
+
+	struct UniformData
+	{
+		glm::mat4 projection;
+		glm::mat4 view;
+	} uniform_data;
+	std::unique_ptr<vkb::core::BufferC> uniform_buffer;
+
+	VkPipeline            pipeline;
+	VkPipelineLayout      pipeline_layout;
+	VkDescriptorSet       descriptor_set;
+	VkDescriptorSetLayout descriptor_set_layout;
+
+	struct
+	{
+		glm::mat4 model_matrix;
+		glm::vec4 color;
+	} push_const_block;
+
+	std::vector<int32_t>                conditional_visibility_list;
+	std::unique_ptr<vkb::core::BufferC> conditional_visibility_buffer;
+
+	ConditionalRendering();
+	~ConditionalRendering();
+	virtual void request_gpu_features(vkb::PhysicalDevice &gpu) override;
+	void         build_command_buffers() override;
+	void         load_assets();
+	void         setup_descriptor_pool();
+	void         setup_descriptor_set_layout();
+	void         setup_descriptor_sets();
+	void         prepare_pipelines();
+	void         prepare_uniform_buffers();
+	void         update_uniform_buffers();
+	void         prepare_visibility_buffer();
+	void         update_visibility_buffer();
+	void         draw();
+	bool         prepare(const vkb::ApplicationOptions &options) override;
+	virtual void render(float delta_time) override;
+	virtual void on_update_ui_overlay(vkb::Drawer &drawer) override;
+	virtual bool resize(const uint32_t width, const uint32_t height) override;
+};
+
+std::unique_ptr<vkb::Application> create_conditional_rendering();