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2025-09-04 10:54:47 +08:00
commit 6bc8f61b18
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+/* Copyright (c) 2019-2025, Arm Limited and Contributors
+ *
+ * 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 "common/error.h"
+
+#include "common/glm_common.h"
+
+#include "rendering/subpass.h"
+
+namespace vkb
+{
+namespace core
+{
+template <vkb::BindingType bindingType>
+class CommandBuffer;
+using CommandBufferC = CommandBuffer<vkb::BindingType::C>;
+}        // namespace core
+
+namespace sg
+{
+class Scene;
+class Node;
+class Mesh;
+class SubMesh;
+class Camera;
+}        // namespace sg
+
+/**
+ * @brief Global uniform structure for base shader
+ */
+struct alignas(16) GlobalUniform
+{
+	glm::mat4 model;
+
+	glm::mat4 camera_view_proj;
+
+	glm::vec3 camera_position;
+};
+
+/**
+ * @brief PBR material uniform for base shader
+ */
+struct PBRMaterialUniform
+{
+	glm::vec4 base_color_factor;
+
+	float metallic_factor;
+
+	float roughness_factor;
+};
+
+/**
+ * @brief This subpass is responsible for rendering a Scene
+ */
+class GeometrySubpass : public vkb::rendering::SubpassC
+{
+  public:
+	/**
+	 * @brief Constructs a subpass for the geometry pass of Deferred rendering
+	 * @param render_context Render context
+	 * @param vertex_shader Vertex shader source
+	 * @param fragment_shader Fragment shader source
+	 * @param scene Scene to render on this subpass
+	 * @param camera Camera used to look at the scene
+	 */
+	GeometrySubpass(RenderContext &render_context, ShaderSource &&vertex_shader, ShaderSource &&fragment_shader, sg::Scene &scene, sg::Camera &camera);
+
+	virtual ~GeometrySubpass() = default;
+
+	virtual void prepare() override;
+
+	/**
+	 * @brief Record draw commands
+	 */
+	virtual void draw(vkb::core::CommandBufferC &command_buffer) override;
+
+	/**
+	 * @brief Thread index to use for allocating resources
+	 */
+	void set_thread_index(uint32_t index);
+
+  protected:
+	virtual void update_uniform(vkb::core::CommandBufferC &command_buffer, sg::Node &node, size_t thread_index);
+
+	void draw_submesh(vkb::core::CommandBufferC &command_buffer, sg::SubMesh &sub_mesh, VkFrontFace front_face = VK_FRONT_FACE_COUNTER_CLOCKWISE);
+
+	virtual void prepare_pipeline_state(vkb::core::CommandBufferC &command_buffer, VkFrontFace front_face, bool double_sided_material);
+
+	virtual PipelineLayout &prepare_pipeline_layout(vkb::core::CommandBufferC         &command_buffer,
+	                                                const std::vector<ShaderModule *> &shader_modules);
+
+	virtual void prepare_push_constants(vkb::core::CommandBufferC &command_buffer, sg::SubMesh &sub_mesh);
+
+	virtual void draw_submesh_command(vkb::core::CommandBufferC &command_buffer, sg::SubMesh &sub_mesh);
+
+	/**
+	 * @brief Sorts objects based on distance from camera and classifies them
+	 *        into opaque and transparent in the arrays provided
+	 */
+	void get_sorted_nodes(std::multimap<float, std::pair<sg::Node *, sg::SubMesh *>> &opaque_nodes,
+	                      std::multimap<float, std::pair<sg::Node *, sg::SubMesh *>> &transparent_nodes);
+
+	sg::Camera &camera;
+
+	std::vector<sg::Mesh *> meshes;
+
+	sg::Scene &scene;
+
+	uint32_t thread_index{0};
+
+	vkb::RasterizationState base_rasterization_state{};
+};
+
+}        // namespace vkb