init

2025-09-04 10:54:47 +08:00
commit 6bc8f61b18
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+/* Copyright (c) 2024, Google
+ *
+ * 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.
+ */
+
+#pragma once
+
+#include "api_vulkan_sample.h"
+#include "rendering/render_pipeline.h"
+#include "scene_graph/components/camera.h"
+
+class OITDepthPeeling : public ApiVulkanSample
+{
+  public:
+	OITDepthPeeling();
+	~OITDepthPeeling();
+
+	bool prepare(const vkb::ApplicationOptions &options) override;
+	bool resize(const uint32_t width, const uint32_t height) override;
+	void render(float delta_time) override;
+	void build_command_buffers() override;
+	void request_gpu_features(vkb::PhysicalDevice &gpu) override;
+	void on_update_ui_overlay(vkb::Drawer &drawer) override;
+
+  private:
+	void create_sized_objects(const uint32_t width, const uint32_t height);
+	void destroy_sized_objects();
+	void create_gather_pass_objects(const uint32_t width, const uint32_t height);
+	void create_images(const uint32_t width, const uint32_t height);
+
+	void load_assets();
+	void create_samplers();
+	void create_constant_buffers();
+	void create_descriptors();
+	void create_pipelines();
+
+	void update_descriptors();
+	void update_scene_constants();
+
+  private:
+	static constexpr uint32_t kLayerMaxCount = 8;
+
+	static constexpr uint32_t kDepthCount = 2;
+
+	static constexpr float kBackgroundGrayscaleMin = 0.0f;
+	static constexpr float kBackgroundGrayscaleMax = 1.0f;
+
+	static constexpr float kObjectAlphaMin = 0.0f;
+	static constexpr float kObjectAlphaMax = 1.0f;
+
+	struct SceneConstants
+	{
+		glm::mat4  model_view_projection;
+		glm::f32   background_grayscale;
+		glm::f32   object_alpha;
+		glm::int32 front_layer_index;
+		glm::int32 back_layer_index;
+	};
+
+  private:
+	std::unique_ptr<vkb::sg::SubMesh> object;
+	Texture                           background_texture;
+
+	std::unique_ptr<vkb::core::BufferC> scene_constants;
+
+	VkSampler point_sampler = VK_NULL_HANDLE;
+
+	std::unique_ptr<vkb::core::Image>     layer_image[kLayerMaxCount];
+	std::unique_ptr<vkb::core::ImageView> layer_image_view[kLayerMaxCount];
+
+	std::unique_ptr<vkb::core::Image>     depth_image[kDepthCount];
+	std::unique_ptr<vkb::core::ImageView> depth_image_view[kDepthCount];
+
+	VkRenderPass  gather_render_pass                 = VK_NULL_HANDLE;
+	VkFramebuffer gather_framebuffer[kLayerMaxCount] = {};
+
+	VkDescriptorSetLayout gather_descriptor_set_layout       = VK_NULL_HANDLE;
+	VkDescriptorSet       gather_descriptor_set[kDepthCount] = {};
+	VkDescriptorSetLayout combine_descriptor_set_layout      = VK_NULL_HANDLE;
+	VkDescriptorSet       combine_descriptor_set             = VK_NULL_HANDLE;
+
+	VkDescriptorPool descriptor_pool = VK_NULL_HANDLE;
+
+	VkPipelineLayout gather_pipeline_layout  = VK_NULL_HANDLE;
+	VkPipeline       gather_first_pipeline   = VK_NULL_HANDLE;
+	VkPipeline       gather_pipeline         = VK_NULL_HANDLE;
+	VkPipelineLayout combine_pipeline_layout = VK_NULL_HANDLE;
+	VkPipeline       combine_pipeline        = VK_NULL_HANDLE;
+	VkPipeline       background_pipeline     = VK_NULL_HANDLE;
+
+	int32_t camera_auto_rotation = false;
+	float   background_grayscale = 0.3f;
+	float   object_alpha         = 0.5f;
+	int32_t front_layer_index    = 0;
+	int32_t back_layer_index     = kLayerMaxCount - 1;
+};
+
+std::unique_ptr<vkb::VulkanSampleC> create_oit_depth_peeling();