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2025-09-04 10:54:47 +08:00
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+/* Copyright (c) 2021-2024, 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.
+ */
+
+/*
+ * Separate samplers and image to draw a single image with different sampling options
+ */
+
+#pragma once
+
+#include <ktx.h>
+
+#include "api_vulkan_sample.h"
+
+class SeparateImageSampler : public ApiVulkanSample
+{
+  public:
+	// Vertex layout for this example
+	struct VertexStructure
+	{
+		float pos[3];
+		float uv[2];
+		float normal[3];
+	};
+
+	Texture texture;
+
+	std::array<VkSampler, 2>       samplers{};
+	int32_t                        selected_sampler = 0;
+	std::array<VkDescriptorSet, 2> sampler_descriptor_sets{};
+
+	std::unique_ptr<vkb::core::BufferC> vertex_buffer;
+	std::unique_ptr<vkb::core::BufferC> index_buffer;
+	uint32_t                            index_count;
+
+	std::unique_ptr<vkb::core::BufferC> uniform_buffer_vs;
+
+	struct
+	{
+		glm::mat4 projection;
+		glm::mat4 model;
+		glm::vec4 view_pos;
+	} ubo_vs;
+
+	VkPipeline       pipeline            = VK_NULL_HANDLE;
+	VkPipelineLayout pipeline_layout     = VK_NULL_HANDLE;
+	VkDescriptorSet  base_descriptor_set = VK_NULL_HANDLE;
+
+	VkDescriptorSetLayout base_descriptor_set_layout;
+	VkDescriptorSetLayout sampler_descriptor_set_layout;
+
+	SeparateImageSampler();
+	~SeparateImageSampler() override;
+	virtual void request_gpu_features(vkb::PhysicalDevice &gpu) override;
+	void         build_command_buffers() override;
+	void         setup_samplers();
+	void         load_assets();
+	void         draw();
+	void         generate_quad();
+	void         setup_descriptor_pool();
+	void         setup_descriptor_set_layout();
+	void         setup_descriptor_set();
+	void         prepare_pipelines();
+	void         prepare_uniform_buffers();
+	void         update_uniform_buffers();
+	bool         prepare(const vkb::ApplicationOptions &options) override;
+	virtual void render(float delta_time) override;
+	virtual void view_changed() override;
+	virtual void on_update_ui_overlay(vkb::Drawer &drawer) override;
+};
+
+std::unique_ptr<vkb::Application> create_separate_image_sampler();