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2025-09-04 10:54:47 +08:00
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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 "buffer_pool.h"
+#include "rendering/subpass.h"
+
+#include "common/glm_common.h"
+
+// This value is per type of light that we feed into the shader
+#define MAX_DEFERRED_LIGHT_COUNT 48
+
+namespace vkb
+{
+namespace core
+{
+template <vkb::BindingType bindingType>
+class CommandBuffer;
+using CommandBufferC = CommandBuffer<vkb::BindingType::C>;
+}        // namespace core
+
+namespace sg
+{
+class Camera;
+class Light;
+class Scene;
+}        // namespace sg
+
+/**
+ * @brief Light uniform structure for lighting shader
+ * Inverse view projection matrix and inverse resolution vector are used
+ * in lighting pass to reconstruct position from depth and frag coord
+ */
+struct alignas(16) LightUniform
+{
+	glm::mat4 inv_view_proj;
+	glm::vec2 inv_resolution;
+};
+
+struct alignas(16) DeferredLights
+{
+	vkb::rendering::Light directional_lights[MAX_DEFERRED_LIGHT_COUNT];
+	vkb::rendering::Light point_lights[MAX_DEFERRED_LIGHT_COUNT];
+	vkb::rendering::Light spot_lights[MAX_DEFERRED_LIGHT_COUNT];
+};
+
+/**
+ * @brief Lighting pass of Deferred Rendering
+ */
+class LightingSubpass : public vkb::rendering::SubpassC
+{
+  public:
+	LightingSubpass(RenderContext &render_context, ShaderSource &&vertex_shader, ShaderSource &&fragment_shader, sg::Camera &camera, sg::Scene &scene);
+
+	virtual void prepare() override;
+
+	void draw(vkb::core::CommandBufferC &command_buffer) override;
+
+  private:
+	sg::Camera &camera;
+
+	sg::Scene &scene;
+
+	ShaderVariant lighting_variant;
+};
+
+}        // namespace vkb