feat: cubemap shadow mapping — true omnidirectional point light shadows
- VulkanShadowMap: 1024x1024x6 layer D32_SFLOAT cube image - CubeCompatible flag, cube view for sampling, 6 face views for rendering - GetFaceViewProj: 6 directions (+X, -X, +Y, -Y, +Z, -Z) with correct up vectors - 6 shadow render passes per frame (one per cube face) - Fragment shader: samplerCube instead of sampler2D - Shadow: direction from light to fragment, distance comparison - No more perspective frustum limitation — omnidirectional shadows - shadow.vert: same push constant block (160B), uses lightViewProj per face - triangle.vert: removed fragLightSpacePos (not needed for cubemap) - Reduced shadow map size to 1024 (6x memory vs single 2048) - Floor/Grid excluded from shadow casting
This commit is contained in:
emil28092005
@@ -43,7 +43,7 @@ internal sealed unsafe class VulkanRenderer : IRenderer, Engine.Graphics.IScreen
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_shadowMap = new VulkanShadowMap(ctx.Device, ctx, _pipeline.DescriptorSetLayout);
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for (int i = 0; i < VulkanFrameResources.MaxFramesInFlight; i++)
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_frameResources.UpdateShadowDescriptor(i, _shadowMap.ShadowSampler, _shadowMap.DepthImageView);
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_frameResources.UpdateShadowDescriptor(i, _shadowMap.ShadowSampler, _shadowMap.CubeImageView);
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_imGui = new VulkanImGui(ctx, _frameResources.CommandPool, swapchain.Format, swapchain.DepthFormat);
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}
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@@ -174,90 +174,97 @@ internal sealed unsafe class VulkanRenderer : IRenderer, Engine.Graphics.IScreen
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};
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Vk.vkBeginCommandBuffer(cmd, &beginInfo);
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// === SHADOW PASS ===
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// === SHADOW CUBEMAP PASSES (6 faces) ===
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TransitionImageLayoutDepth(cmd, _shadowMap.DepthImage,
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VkImageLayout.Undefined, VkImageLayout.DepthStencilAttachmentOptimal,
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0, 0, 0x100, 0x200);
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var shadowDepthClear = new VkClearValue
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{
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DepthStencil = new VkClearDepthStencilValue { Depth = 1.0f, Stencil = 0 },
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};
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var lightPosVec = new Vector3(lightPos.X, lightPos.Y, lightPos.Z);
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var shadowDepthAttachment = new VkRenderingAttachmentInfo
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for (int face = 0; face < 6; face++)
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{
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sType = VkStructureType.RenderingAttachmentInfo,
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imageView = _shadowMap.DepthImageView,
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imageLayout = VkImageLayout.DepthStencilAttachmentOptimal,
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loadOp = VkAttachmentLoadOp.Clear,
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storeOp = VkAttachmentStoreOp.Store,
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clearValue = shadowDepthClear,
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};
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var (faceView, faceProj) = VulkanShadowMap.GetFaceViewProj(lightPosVec, face);
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var faceViewProj = faceView * faceProj;
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var shadowRenderingInfo = new VkRenderingInfo
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{
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sType = VkStructureType.RenderingInfo,
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renderArea = new VkRect2D
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var shadowDepthClear = new VkClearValue
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{
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DepthStencil = new VkClearDepthStencilValue { Depth = 1.0f, Stencil = 0 },
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};
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var shadowDepthAttachment = new VkRenderingAttachmentInfo
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{
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sType = VkStructureType.RenderingAttachmentInfo,
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imageView = _shadowMap.FaceImageViews[face],
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imageLayout = VkImageLayout.DepthStencilAttachmentOptimal,
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loadOp = VkAttachmentLoadOp.Clear,
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storeOp = VkAttachmentStoreOp.Store,
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clearValue = shadowDepthClear,
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};
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var shadowRenderingInfo = new VkRenderingInfo
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{
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sType = VkStructureType.RenderingInfo,
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renderArea = new VkRect2D
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{
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Offset = new VkOffset2D { X = 0, Y = 0 },
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Extent = new VkExtent2D { Width = VulkanShadowMap.ShadowMapSize, Height = VulkanShadowMap.ShadowMapSize },
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},
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layerCount = 1,
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colorAttachmentCount = 0,
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pColorAttachments = null,
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pDepthAttachment = &shadowDepthAttachment,
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};
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Vk.vkCmdBeginRendering(cmd, &shadowRenderingInfo);
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Vk.vkCmdBindPipeline(cmd, VkPipelineBindPoint.Graphics, _shadowMap.Pipeline);
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var shadowViewport = new VkViewport
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{
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X = 0, Y = 0,
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Width = VulkanShadowMap.ShadowMapSize,
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Height = VulkanShadowMap.ShadowMapSize,
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MinDepth = 0, MaxDepth = 1,
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};
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Vk.vkCmdSetViewport(cmd, 0, 1, &shadowViewport);
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var shadowScissor = new VkRect2D
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{
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Offset = new VkOffset2D { X = 0, Y = 0 },
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Extent = new VkExtent2D { Width = VulkanShadowMap.ShadowMapSize, Height = VulkanShadowMap.ShadowMapSize },
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},
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layerCount = 1,
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colorAttachmentCount = 0,
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pColorAttachments = null,
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pDepthAttachment = &shadowDepthAttachment,
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};
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};
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Vk.vkCmdSetScissor(cmd, 0, 1, &shadowScissor);
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Vk.vkCmdBeginRendering(cmd, &shadowRenderingInfo);
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Vk.vkCmdSetDepthBias(cmd, 1.25f, 0.0f, 1.75f);
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Vk.vkCmdBindPipeline(cmd, VkPipelineBindPoint.Graphics, _shadowMap.Pipeline);
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foreach (var dc in drawCalls)
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{
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if (!dc.castShadow) continue;
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var shadowViewport = new VkViewport
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{
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X = 0, Y = 0,
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Width = VulkanShadowMap.ShadowMapSize,
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Height = VulkanShadowMap.ShadowMapSize,
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MinDepth = 0, MaxDepth = 1,
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};
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Vk.vkCmdSetViewport(cmd, 0, 1, &shadowViewport);
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var vertexBuf = dc.vertexBuf;
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ulong offset = 0;
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Vk.vkCmdBindVertexBuffers(cmd, 0, 1, &vertexBuf, &offset);
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Vk.vkCmdBindIndexBuffer(cmd, dc.indexBuf, 0, 1);
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var shadowScissor = new VkRect2D
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{
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Offset = new VkOffset2D { X = 0, Y = 0 },
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Extent = new VkExtent2D { Width = VulkanShadowMap.ShadowMapSize, Height = VulkanShadowMap.ShadowMapSize },
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};
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Vk.vkCmdSetScissor(cmd, 0, 1, &shadowScissor);
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var pcData = stackalloc byte[160];
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var modelCopy = dc.model;
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System.Buffer.MemoryCopy(&modelCopy, pcData, 64, 64);
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var lpCopy = lightPos;
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System.Buffer.MemoryCopy(&lpCopy, pcData + 64, 16, 16);
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var lcCopy = lightColor;
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System.Buffer.MemoryCopy(&lcCopy, pcData + 80, 16, 16);
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var lvpCopy = faceViewProj;
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System.Buffer.MemoryCopy(&lvpCopy, pcData + 96, 64, 64);
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Vk.vkCmdSetDepthBias(cmd, 1.25f, 0.0f, 1.75f);
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Vk.vkCmdPushConstants(cmd, _shadowMap.PipelineLayout, VkShaderStageFlags.Vertex | VkShaderStageFlags.Fragment, 0, 160, pcData);
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foreach (var dc in drawCalls)
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{
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if (!dc.castShadow) continue;
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Vk.vkCmdDrawIndexed(cmd, dc.indexCount, 1, 0, 0, 0);
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}
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var vertexBuf = dc.vertexBuf;
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ulong offset = 0;
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Vk.vkCmdBindVertexBuffers(cmd, 0, 1, &vertexBuf, &offset);
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Vk.vkCmdBindIndexBuffer(cmd, dc.indexBuf, 0, 1);
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// Pack all push constants for shadow pass
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var pcData = stackalloc byte[160];
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var modelCopy = dc.model;
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System.Buffer.MemoryCopy(&modelCopy, pcData, 64, 64);
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var lpCopy = lightPos;
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System.Buffer.MemoryCopy(&lpCopy, pcData + 64, 16, 16);
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var lcCopy = lightColor;
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System.Buffer.MemoryCopy(&lcCopy, pcData + 80, 16, 16);
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var lvpCopy = lightViewProj;
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System.Buffer.MemoryCopy(&lvpCopy, pcData + 96, 64, 64);
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Vk.vkCmdPushConstants(cmd, _shadowMap.PipelineLayout, VkShaderStageFlags.Vertex | VkShaderStageFlags.Fragment, 0, 160, pcData);
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Vk.vkCmdDrawIndexed(cmd, dc.indexCount, 1, 0, 0, 0);
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Vk.vkCmdEndRendering(cmd);
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}
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Vk.vkCmdEndRendering(cmd);
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// Transition shadow map: depth attachment → shader read
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// Transition shadow cubemap: depth attachment → shader read
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TransitionImageLayoutDepth(cmd, _shadowMap.DepthImage,
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VkImageLayout.DepthStencilAttachmentOptimal, VkImageLayout.ShaderReadOnlyOptimal,
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0x100, 0x200, 0x8, 0x20);
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