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Source/Engine/Renderer/ShadowsPass.h

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+// Copyright (c) 2012-2020 Wojciech Figat. All rights reserved.
+
+#pragma once
+
+#include "Engine/Graphics/GPUPipelineStatePermutations.h"
+#include "RenderList.h"
+#include "RendererPass.h"
+#include "Engine/Content/Assets/Shader.h"
+#include "Engine/Content/Assets/Model.h"
+
+/// <summary>
+/// Pixel format for fullscreen render target used for shadows calculations
+/// </summary>
+#define SHADOWS_PASS_SS_RR_FORMAT PixelFormat::R11G11B10_Float
+
+/// <summary>
+/// Shadows rendering service.
+/// </summary>
+class ShadowsPass : public RendererPass<ShadowsPass>
+{
+private:
+
+    // Shader stuff
+    AssetReference<Shader> _shader;
+    GPUPipelineStatePermutationsPs<static_cast<int32>(Quality::MAX) * 2 * 2> _psShadowDir;
+    GPUPipelineStatePermutationsPs<static_cast<int32>(Quality::MAX) * 2> _psShadowPoint;
+    GPUPipelineStatePermutationsPs<static_cast<int32>(Quality::MAX) * 2> _psShadowSpot;
+
+    // Shadow maps stuff
+    int32 _shadowMapsSizeCSM;
+    int32 _shadowMapsSizeCube;
+    GPUTexture* _shadowMapCSM;
+    GPUTexture* _shadowMapCube;
+    Quality _currentShadowMapsQuality;
+
+    // Shadow map rendering stuff
+    RenderContext _shadowContext;
+    RenderList _shadowCache;
+    AssetReference<Model> _sphereModel;
+
+    // Cached state for the current frame rendering (setup via Prepare)
+    int32 maxShadowsQuality;
+
+public:
+
+    /// <summary>
+    /// Init
+    /// </summary>
+    ShadowsPass();
+
+public:
+
+    /// <summary>
+    /// Gets current GPU memory usage by the shadow maps
+    /// </summary>
+    /// <returns>GPU memory used in bytes</returns>
+    uint64 GetShadowMapsMemoryUsage() const;
+
+public:
+
+    // TODO: use full scene shadow map atlas with dynamic slots allocation
+    int32 LastDirLightIndex = -1;
+    GPUTextureView* LastDirLightShadowMap = nullptr;
+    LightShadowData LastDirLight;
+
+public:
+
+    /// <summary>
+    /// Determines whether can render shadow for the specified light.
+    /// </summary>
+    /// <param name="renderContext">The rendering context.</param>
+    /// <param name="light">The light.</param>
+    /// <returns><c>true</c> if can render shadow for the specified light; otherwise, <c>false</c>.</returns>
+    bool CanRenderShadow(RenderContext& renderContext, const RendererPointLightData& light);
+
+    /// <summary>
+    /// Determines whether can render shadow for the specified light.
+    /// </summary>
+    /// <param name="renderContext">The rendering context.</param>
+    /// <param name="light">The light.</param>
+    /// <returns><c>true</c> if can render shadow for the specified light; otherwise, <c>false</c>.</returns>
+    bool CanRenderShadow(RenderContext& renderContext, const RendererSpotLightData& light);
+
+    /// <summary>
+    /// Determines whether can render shadow for the specified light.
+    /// </summary>
+    /// <param name="renderContext">The rendering context.</param>
+    /// <param name="light">The light.</param>
+    /// <returns><c>true</c> if can render shadow for the specified light; otherwise, <c>false</c>.</returns>
+    bool CanRenderShadow(RenderContext& renderContext, const RendererDirectionalLightData& light);
+
+    /// <summary>
+    /// Prepares the shadows rendering. Called by the light pass once per frame.
+    /// </summary>
+    /// <param name="renderContext">The rendering context.</param>
+    /// <param name="context">The GPU command context.</param>
+    void Prepare(RenderContext& renderContext, GPUContext* context);
+
+    /// <summary>
+    /// Renders the shadow mask for the given light.
+    /// </summary>
+    /// <param name="renderContext">The rendering context.</param>
+    /// <param name="light">The light.</param>
+    /// <param name="shadowMask">The shadow mask (output).</param>
+    void RenderShadow(RenderContext& renderContext, RendererPointLightData& light, GPUTextureView* shadowMask);
+
+    /// <summary>
+    /// Renders the shadow mask for the given light.
+    /// </summary>
+    /// <param name="renderContext">The rendering context.</param>
+    /// <param name="light">The light.</param>
+    /// <param name="shadowMask">The shadow mask (output).</param>
+    void RenderShadow(RenderContext& renderContext, RendererSpotLightData& light, GPUTextureView* shadowMask);
+
+    /// <summary>
+    /// Renders the shadow mask for the given light.
+    /// </summary>
+    /// <param name="renderContext">The rendering context.</param>
+    /// <param name="light">The light.</param>
+    /// <param name="index">The light index.</param>
+    /// <param name="shadowMask">The shadow mask (output).</param>
+    void RenderShadow(RenderContext& renderContext, RendererDirectionalLightData& light, int32 index, GPUTextureView* shadowMask);
+
+private:
+
+    void updateShadowMapSize();
+
+#if COMPILE_WITH_DEV_ENV
+    void OnShaderReloading(Asset* obj)
+    {
+        _psShadowDir.Release();
+        _psShadowPoint.Release();
+        _psShadowSpot.Release();
+        invalidateResources();
+    }
+#endif
+
+public:
+
+    // [RendererPass]
+    String ToString() const override;
+    bool Init() override;
+    void Dispose() override;
+
+protected:
+
+    // [RendererPass]
+    bool setupResources() override;
+};