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bvle-voxels/CMakeLists.txt

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Phase 2: GPU-driven voxel rendering pipeline Mega-buffer architecture replacing per-chunk GPU buffers: - Single StructuredBuffer<PackedQuad> for all chunks (2M quads, 16 MB) - StructuredBuffer<GPUChunkInfo> with per-chunk metadata (position, quad offsets, face groups) - VS reads chunk info via push constants (b999) for driver-safe chunk indexing - CPU frustum culling with wi::primitive::Frustum + AABB per chunk - Quads sorted by face direction in greedy mesher (faceOffsets/faceCounts) - GPU frustum + backface cull compute shader (voxelCullCS.hlsl) - GPU binary mesher compute shader baseline (voxelMeshCS.hlsl) - Indirect draw buffers and timestamp query infrastructure - README with build instructions and project architecture
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cmake_minimum_required(VERSION 3.19)
project(BVLEVoxels LANGUAGES CXX)
set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(CMAKE_CXX_EXTENSIONS OFF)
# Wicked Engine options - disable what we don't need
set(WICKED_EDITOR OFF CACHE BOOL "" FORCE)
set(WICKED_TESTS OFF CACHE BOOL "" FORCE)
set(WICKED_IMGUI_EXAMPLE OFF CACHE BOOL "" FORCE)
set(WICKED_WINDOWS_TEMPLATE OFF CACHE BOOL "" FORCE)
set(WICKED_LINUX_TEMPLATE OFF CACHE BOOL "" FORCE)
set(WICKED_ENABLE_SYMLINKS OFF CACHE BOOL "" FORCE)
add_subdirectory(engine)
# ── Voxel Engine Library ──────────────────────────────────────────
file(GLOB_RECURSE VOXEL_SOURCES src/voxel/*.cpp src/voxel/*.h)
add_library(VoxelEngine STATIC ${VOXEL_SOURCES})
target_include_directories(VoxelEngine PUBLIC src)
target_link_libraries(VoxelEngine PUBLIC WickedEngine)
# ── Main Application ─────────────────────────────────────────────
file(GLOB APP_SOURCES src/app/*.cpp src/app/*.h)
add_executable(BVLEVoxels WIN32 ${APP_SOURCES})
target_link_libraries(BVLEVoxels PRIVATE VoxelEngine WickedEngine)
# Copy Content directory (shaders, etc.) to build output
add_custom_command(TARGET BVLEVoxels POST_BUILD
COMMAND ${CMAKE_COMMAND} -E copy_directory
${CMAKE_SOURCE_DIR}/engine/Content
$<TARGET_FILE_DIR:BVLEVoxels>/Content
)
# Copy DXC shader compiler DLL next to the exe (required for runtime shader compilation)
add_custom_command(TARGET BVLEVoxels POST_BUILD
COMMAND ${CMAKE_COMMAND} -E copy_if_different
${CMAKE_SOURCE_DIR}/engine/WickedEngine/dxcompiler.dll
$<TARGET_FILE_DIR:BVLEVoxels>/dxcompiler.dll
COMMENT "Copying DXC shader compiler DLL"
)
# Copy our custom shader sources into Wicked's shader source tree
# so LoadShader can find and compile them as "voxel/voxelVS.cso"
add_custom_command(TARGET BVLEVoxels POST_BUILD
COMMAND ${CMAKE_COMMAND} -E copy_directory
${CMAKE_SOURCE_DIR}/shaders
${CMAKE_SOURCE_DIR}/engine/WickedEngine/shaders/voxel
COMMENT "Copying voxel shaders to Wicked Engine shader source directory"
)
cleanup
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# Delete stale compiled voxel shaders to force runtime recompilation.
# Wicked Engine only compiles .hlsl → .cso when .cso is ABSENT (no timestamp check).
# Without this step, .hlsl changes are silently ignored if old .cso files exist.
add_custom_command(TARGET BVLEVoxels POST_BUILD
COMMAND ${CMAKE_COMMAND} -E rm -f
$<TARGET_FILE_DIR:BVLEVoxels>/shaders/hlsl6/voxel/voxelVS.cso
$<TARGET_FILE_DIR:BVLEVoxels>/shaders/hlsl6/voxel/voxelPS.cso
$<TARGET_FILE_DIR:BVLEVoxels>/shaders/hlsl6/voxel/voxelCullCS.cso
$<TARGET_FILE_DIR:BVLEVoxels>/shaders/hlsl6/voxel/voxelMeshCS.cso
Phase 5.1: Naive Surface Nets smooth rendering Implement CPU-side Naive Surface Nets for smooth voxel surfaces (SmoothStone, Snow) coexisting with blocky voxels (Grass, Dirt, Stone, Sand). Key features: - SmoothMesher with binary SDF, centroid vertex placement, per-axis boundary clamping to align with blocky grid at smooth↔blocky transitions - Cross-chunk connectivity: PAD=2 SDF grid, vertex range [-1, CHUNK_SIZE), canonical edge ownership (no duplicate triangles, no z-fighting) - Face normals oriented by edge axis+sign (robust with binary SDF, unlike SDF gradient dot or centroid sampling approaches) - Y-axis winding fix: sharing cells have different spatial arrangement, requiring opposite winding from X and Z axes - GPU mesher treats smooth neighbors as solid (no blocky faces toward smooth) - Material blending: primary (smooth-only) + secondary (all counts) per vertex - Dedicated shaders: voxelSmoothVS (vertex pulling t6) + voxelSmoothPS (triplanar + lerp blending between two materials) - Separate render pass with LoadOp::LOAD after voxels+topings - New materials: SmoothStone (mat 6), blocky Stone (mat 3) and Dirt patches added to world generation for boundary testing
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$<TARGET_FILE_DIR:BVLEVoxels>/shaders/hlsl6/voxel/voxelTopingVS.cso
$<TARGET_FILE_DIR:BVLEVoxels>/shaders/hlsl6/voxel/voxelTopingPS.cso
$<TARGET_FILE_DIR:BVLEVoxels>/shaders/hlsl6/voxel/voxelSmoothVS.cso
$<TARGET_FILE_DIR:BVLEVoxels>/shaders/hlsl6/voxel/voxelSmoothPS.cso
Phase 6.1: RT infrastructure — MRT normals + BLAS/TLAS build - Normal render target (R16G16B16A16_SNORM) as MRT SV_TARGET1 in all 3 pixel shaders (voxelPS, voxelTopingPS, voxelSmoothPS) for future RT shadow/AO - BLAS extraction compute shader (voxelBLASExtractCS.hlsl): converts PackedQuad StructuredBuffer to float3 position buffer for DXR BLAS input - Blocky BLAS: single BLAS from all GPU-meshed quads (~1.5M triangles) - Smooth BLAS: single BLAS from smooth vertex buffer directly - TLAS: 2 instances (blocky + smooth), identity transforms, CreateBuffer2 with callback to avoid UpdateBuffer on RAY_TRACING flagged buffers - Fix: Wicked always accesses index_buffer in CreateRaytracingAccelerationStructure via to_internal() even for non-indexed geometry — provide dummy valid buffer
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$<TARGET_FILE_DIR:BVLEVoxels>/shaders/hlsl6/voxel/voxelSmoothCentroidCS.cso
$<TARGET_FILE_DIR:BVLEVoxels>/shaders/hlsl6/voxel/voxelSmoothCS.cso
$<TARGET_FILE_DIR:BVLEVoxels>/shaders/hlsl6/voxel/voxelBLASExtractCS.cso
Phase 6.2: RT shadows — inline ray queries with BLAS/TLAS fix Add shadow compute shader (voxelShadowCS.hlsl) that traces rays toward the sun using DXR inline ray queries (RayQuery<>, SM 6.5). Shadows modulate voxelRT_ in-place via RWTexture2D (no extra render target). Key fixes to Phase 6.1 BLAS/TLAS infrastructure: - Sequential index buffer required: Wicked treats IndexCount=0 with non-null IndexBuffer as "0 indexed triangles" → empty BLAS - Memory barriers between BLAS→TLAS→RT: without GPUBarrier::Memory() the TLAS build races with BLAS builds, causing zero ray hits - inverseViewProjection added to VoxelCB for depth reconstruction F5 toggles shadows OFF→ON→DEBUG (red=hit, green=miss, blue=backface).
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$<TARGET_FILE_DIR:BVLEVoxels>/shaders/hlsl6/voxel/voxelShadowCS.cso
Phase 6.3: RT ambient occlusion with bilateral blur - 8 cosine-weighted hemisphere rays per pixel (inline ray queries, SM 6.5) - Distance-weighted AO: quadratic falloff (1-hitT/aoRadius)² instead of binary hit/miss - World-space hash seed: voxel coord + tangent-plane frac position (stable, no flicker) - Bilateral blur pipeline: 2-pass separable (H+V), radius 6, depth+normal edge-stopping - 4-pass dispatch: shadow+rawAO → blur H → blur V → apply - AO written to separate R8_UNORM texture, blurred, then applied to color buffer - Debug mode (F5 x3): grayscale AO visualization
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$<TARGET_FILE_DIR:BVLEVoxels>/shaders/hlsl6/voxel/voxelAOBlurCS.cso
$<TARGET_FILE_DIR:BVLEVoxels>/shaders/hlsl6/voxel/voxelAOApplyCS.cso
cleanup
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$<TARGET_FILE_DIR:BVLEVoxels>/shaders/hlsl6/voxel/voxelCommon.hlsli.cso
COMMENT "Clearing stale voxel shader cache (forces recompilation from current .hlsl sources)"
)
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