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2025-09-04 10:54:47 +08:00
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+/* Copyright (c) 2019-2024, 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.
+ */
+
+/*
+ * Conservative rasterization
+ *
+ * Note: Requires a device that supports the VK_EXT_conservative_rasterization extension
+ *
+ * Uses an offscreen buffer with lower resolution to demonstrate the effect of conservative rasterization
+ */
+
+#pragma once
+
+#include "api_vulkan_sample.h"
+
+#define FB_COLOR_FORMAT VK_FORMAT_R8G8B8A8_UNORM
+#define ZOOM_FACTOR 16
+
+class ConservativeRasterization : public ApiVulkanSample
+{
+  public:
+	// Fetch and store conservative rasterization state props for display purposes
+	VkPhysicalDeviceConservativeRasterizationPropertiesEXT conservative_raster_properties{};
+
+	bool conservative_raster_enabled = true;
+
+	struct Vertex
+	{
+		float position[3];
+		float color[3];
+	};
+
+	struct Triangle
+	{
+		std::unique_ptr<vkb::core::BufferC> vertices;
+		std::unique_ptr<vkb::core::BufferC> indices;
+		uint32_t                            index_count;
+	} triangle;
+
+	std::unique_ptr<vkb::core::BufferC> uniform_buffer;
+
+	struct UniformBuffers
+	{
+		std::unique_ptr<vkb::core::BufferC> scene;
+	} uniform_buffers;
+
+	struct UboScene
+	{
+		glm::mat4 projection;
+		glm::mat4 model;
+	} ubo_scene;
+
+	struct PipelineLayouts
+	{
+		VkPipelineLayout scene;
+		VkPipelineLayout fullscreen;
+	} pipeline_layouts;
+
+	struct Pipelines
+	{
+		VkPipeline triangle;
+		VkPipeline triangle_conservative_raster;
+		VkPipeline triangle_overlay;
+		VkPipeline fullscreen;
+	} pipelines;
+
+	struct DescriptorSetLayouts
+	{
+		VkDescriptorSetLayout scene;
+		VkDescriptorSetLayout fullscreen;
+	} descriptor_set_layouts;
+
+	struct DescriptorSets
+	{
+		VkDescriptorSet scene;
+		VkDescriptorSet fullscreen;
+	} descriptor_sets;
+
+	// Framebuffer for offscreen rendering
+	struct FrameBufferAttachment
+	{
+		VkImage        image;
+		VkDeviceMemory mem;
+		VkImageView    view;
+	};
+	struct OffscreenPass
+	{
+		int32_t               width, height;
+		VkFramebuffer         framebuffer;
+		FrameBufferAttachment color, depth;
+		VkRenderPass          render_pass;
+		VkSampler             sampler;
+		VkDescriptorImageInfo descriptor;
+	} offscreen_pass;
+
+	ConservativeRasterization();
+	~ConservativeRasterization();
+	virtual void request_gpu_features(vkb::PhysicalDevice &gpu) override;
+	void         build_command_buffers() override;
+	void         prepare_offscreen();
+	void         load_assets();
+	void         setup_descriptor_pool();
+	void         setup_descriptor_set_layout();
+	void         setup_descriptor_set();
+	void         prepare_pipelines();
+	void         prepare_uniform_buffers();
+	void         update_uniform_buffers_scene();
+	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;
+};
+
+std::unique_ptr<vkb::VulkanSampleC> create_conservative_rasterization();