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/*shadow mapping greatly inspired from:
* Vulkan Example - Deferred shading with shadows from multiple light sources using geometry shader instancing
* Copyright (C) 2016 by Sascha Willems - www.saschawillems.de
* This code is licensed under the MIT license (MIT) (http://opensource.org/licenses/MIT)
*/
// Copyright (c) 2020-2021 Jean-Philippe Bruyère <jp_bruyere@hotmail.com>
//
// This code is licensed under the MIT license (MIT) (http://opensource.org/licenses/MIT)
using System;
using System.Numerics;
using System.Runtime.InteropServices;
using vke;
using vke.glTF;
using Vulkan;
using static vkChess.DeferredPbrRendererBase;
namespace vkChess {
public class ShadowMapRenderer : IDisposable {
Device dev;
public static uint SHADOWMAP_SIZE = 4096;
public static VkFormat SHADOWMAP_FORMAT = VkFormat.D32SfloatS8Uint;
public static VkSampleCountFlags SHADOWMAP_NUM_SAMPLES = VkSampleCountFlags.SampleCount1;
public bool updateShadowMap = true, updateLightMatricesRequested = true;
public float depthBiasConstant = 1.5f;
public float depthBiasSlope = 1.75f;
float lightFOV = Utils.DegreesToRadians (60);
float lightFarPlane;
RenderPass shadowPass;
FrameBuffer fbShadowMap;
public Image shadowMap { get; private set; }
Pipeline shadowPipeline;
DescriptorPool descriptorPool;
DescriptorSetLayout descLayoutShadow;
DescriptorSet dsShadow;
DeferredPbrRendererBase renderer;
public ShadowMapRenderer (Device dev, DeferredPbrRendererBase renderer, float farPlane = 16f) {
this.lightFarPlane = farPlane;
this.dev = dev;
this.renderer = renderer;
descriptorPool = new DescriptorPool (dev, 1,
new VkDescriptorPoolSize (VkDescriptorType.UniformBuffer, 2)
);
init ();
}
void init () {
//Shadow map renderpass
shadowPass = new RenderPass (dev, VkSampleCountFlags.SampleCount1);
shadowPass.AddAttachment (SHADOWMAP_FORMAT, VkImageLayout.DepthStencilReadOnlyOptimal, SHADOWMAP_NUM_SAMPLES);
shadowPass.ClearValues.Add (new VkClearValue { depthStencil = new VkClearDepthStencilValue (1.0f, 0) });
SubPass subpass0 = new SubPass ();
subpass0.SetDepthReference (0);
shadowPass.AddSubpass (subpass0);
shadowPass.AddDependency (Vk.SubpassExternal, 0,
VkPipelineStageFlags.FragmentShader, VkPipelineStageFlags.EarlyFragmentTests,
VkAccessFlags.ShaderRead, VkAccessFlags.DepthStencilAttachmentWrite);
shadowPass.AddDependency (0, Vk.SubpassExternal,
VkPipelineStageFlags.LateFragmentTests, VkPipelineStageFlags.FragmentShader,
VkAccessFlags.DepthStencilAttachmentWrite, VkAccessFlags.ShaderRead);
descLayoutShadow = new DescriptorSetLayout (dev,
new VkDescriptorSetLayoutBinding (0, VkShaderStageFlags.Geometry, VkDescriptorType.UniformBuffer),//matrices
new VkDescriptorSetLayoutBinding (1, VkShaderStageFlags.Geometry, VkDescriptorType.UniformBuffer));//lights
using (GraphicPipelineConfig cfg = GraphicPipelineConfig.CreateDefault (VkPrimitiveTopology.TriangleList)) {
cfg.rasterizationState.cullMode = VkCullModeFlags.Front;
cfg.rasterizationState.depthBiasEnable = true;
cfg.dynamicStates.Add (VkDynamicState.DepthBias);
cfg.RenderPass = shadowPass;
cfg.Layout = new PipelineLayout (dev, descLayoutShadow);
cfg.AddVertexBinding<PbrModelTexArray.Vertex> (0);
cfg.AddVertexAttributes (0, VkFormat.R32g32b32Sfloat);
cfg.AddVertexBinding<VkChess.InstanceData> (1, VkVertexInputRate.Instance);
cfg.vertexAttributes.Add (new VkVertexInputAttributeDescription (1, 1, VkFormat.R32g32b32a32Sfloat, 16));
cfg.vertexAttributes.Add (new VkVertexInputAttributeDescription (1, 2, VkFormat.R32g32b32a32Sfloat, 32));
cfg.vertexAttributes.Add (new VkVertexInputAttributeDescription (1, 3, VkFormat.R32g32b32a32Sfloat, 48));
cfg.vertexAttributes.Add (new VkVertexInputAttributeDescription (1, 4, VkFormat.R32g32b32a32Sfloat, 64));
cfg.AddShader (dev, VkShaderStageFlags.Vertex, "#vkChess.net.shadow.vert.spv");
cfg.AddShader (dev, VkShaderStageFlags.Geometry, "#vkChess.net.shadow.geom.spv");
shadowPipeline = new GraphicPipeline (cfg, "shadow");
}
//shadow map image
shadowMap = new Image (dev, SHADOWMAP_FORMAT, VkImageUsageFlags.DepthStencilAttachment | VkImageUsageFlags.Sampled, VkMemoryPropertyFlags.DeviceLocal, SHADOWMAP_SIZE, SHADOWMAP_SIZE,
VkImageType.Image2D, SHADOWMAP_NUM_SAMPLES, VkImageTiling.Optimal, 1, (uint)renderer.lights.Length);
shadowMap.CreateView (VkImageViewType.ImageView2DArray, VkImageAspectFlags.Depth, shadowMap.CreateInfo.arrayLayers);
shadowMap.CreateSampler (VkSamplerAddressMode.ClampToBorder);
shadowMap.Descriptor.imageLayout = VkImageLayout.DepthStencilReadOnlyOptimal;
fbShadowMap = new FrameBuffer (shadowPass, SHADOWMAP_SIZE, SHADOWMAP_SIZE, (uint)renderer.lights.Length);
fbShadowMap.attachments.Add (shadowMap);
fbShadowMap.Activate ();
dsShadow = descriptorPool.Allocate (descLayoutShadow);
DescriptorSetWrites dsWrite = new DescriptorSetWrites (dsShadow, descLayoutShadow);
dsWrite.Write (dev, renderer.uboMatrices.Descriptor, renderer.uboLights.Descriptor);
shadowMap.SetName ("shadowmap");
fbShadowMap.SetName ("fbShadow");
}
public void update_light_matrices () {
Matrix4x4 proj = Matrix4x4.CreatePerspectiveFieldOfView (lightFOV, 1, 0.1f, lightFarPlane);
for (int i = 0; i < renderer.lights.Length; i++) {
Matrix4x4 view = Matrix4x4.CreateLookAt (renderer.lights[i].position.ToVector3 (), Vector3.Zero, Vector3.UnitY);
renderer.lights[i].mvp = view * proj;
}
renderer.uboLights.Update (renderer.lights);
dev.WaitIdle ();
}
public void update_shadow_map (CommandPool cmdPool, vke.Buffer instanceBuf, params Model.InstancedCmd[] instances) {
if (updateLightMatricesRequested) {
update_light_matrices ();
updateLightMatricesRequested = false;
}
PrimaryCommandBuffer cmd = cmdPool.AllocateAndStart ();
shadowPass.Begin (cmd, fbShadowMap);
cmd.SetViewport (SHADOWMAP_SIZE, SHADOWMAP_SIZE);
cmd.SetScissor (SHADOWMAP_SIZE, SHADOWMAP_SIZE);
cmd.BindDescriptorSet (shadowPipeline.Layout, dsShadow);
Vk.vkCmdSetDepthBias (cmd.Handle, depthBiasConstant, 0.0f, depthBiasSlope);
shadowPipeline.Bind (cmd);
if (renderer.model != null) {
renderer.model.Bind(cmd);
renderer.model.Draw(cmd, shadowPipeline.Layout, instanceBuf, true, instances);
}
shadowPass.End (cmd);
renderer.presentQueue.EndSubmitAndWait (cmd);
updateShadowMap = false;
}
public void Dispose () {
shadowPipeline?.Dispose ();
fbShadowMap?.Dispose ();
shadowMap?.Dispose ();
descriptorPool?.Dispose ();
}
}
}
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