Add DirectX, Vulkan and Metal backends.

.github/workflows/build.yml

@@ -18,7 +18,13 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v5
+      - uses: actions/checkout@v5
+        with:
+          repository: treeform/shady
+          ref: shady-backends
+          path: shady
       - uses: treeform/setup-nim-action@v6
+      - run: nimby install shady/shady.nimble
       - run: nimby install gltf/gltf.nimble
         working-directory: ${{ github.workspace }}/..
       - name: Install OpenGL test dependencies (Linux)
@@ -57,12 +63,57 @@ jobs:
         with:
           path: ${{ github.workspace }}
       - run: nim check src/gltf.nim
+      - run: nim r -d:release tests/backend_shaders.nim
       - name: Run tests (Linux)
         if: runner.os == 'Linux'
-        run: xvfb-run -s "-screen 0 1024x768x24" env LIBGL_ALWAYS_SOFTWARE=1 nim r tests/tests.nim
+        run: xvfb-run -s "-screen 0 1024x768x24" env LIBGL_ALWAYS_SOFTWARE=1 nim r -d:release tests/tests.nim
       - name: Run tests (Windows)
         if: runner.os == 'Windows'
         shell: pwsh
         run: |
-          nim c -o:tests.exe tests/tests.nim
+          nim c -d:release -o:tests.exe tests/tests.nim
           .\tests.exe
+
+  backend-compile:
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - os: ubuntu-latest
+            backend: opengl
+            flags: -d:useOpenGL
+          - os: windows-latest
+            backend: opengl
+            flags: -d:useOpenGL
+          - os: windows-latest
+            backend: directx
+            flags: -d:useDirectX
+          - os: windows-latest
+            backend: vulkan
+            flags: -d:useVulkan
+          - os: macos-latest
+            backend: opengl
+            flags: -d:useOpenGL
+          - os: macos-latest
+            backend: metal
+            flags: -d:useMetal4
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v5
+      - uses: actions/checkout@v5
+        with:
+          repository: treeform/shady
+          ref: shady-backends
+          path: shady
+      - uses: treeform/setup-nim-action@v6
+      - run: nimby install shady/shady.nimble
+      - run: nimby install gltf/gltf.nimble
+        working-directory: ${{ github.workspace }}/..
+      - name: Generate viewer atlas
+        run: nim r tools/gen_atlas.nim
+      - name: Validate backend shaders (${{ matrix.backend }})
+        run: nim r -d:release ${{ matrix.flags }} tests/backend_shaders.nim
+      - name: Compile sample assets (${{ matrix.backend }})
+        run: nim c --compileOnly -d:release -d:shadyBinaryShaders ${{ matrix.flags }} tests/sample_assets.nim
+      - name: Compile viewer (${{ matrix.backend }})
+        run: nim c --compileOnly -d:release -d:shadyBinaryShaders ${{ matrix.flags }} tools/gltf_viewer.nim

.github/workflows/docs.yml

@@ -16,7 +16,13 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v5
+      - uses: actions/checkout@v5
+        with:
+          repository: treeform/shady
+          ref: shady-backends
+          path: shady
       - uses: treeform/setup-nim-action@v6
+      - run: nimby install shady/shady.nimble
       - run: nimby install gltf/gltf.nimble
         working-directory: ${{ github.workspace }}/..
       - run: nim doc --index:on --project --git.url:https://github.com/${{ github.repository }} --git.commit:master --out:${{ env.deploy-dir }} ${{ env.nim-src }}

gltf.nimble

@@ -17,3 +17,5 @@ requires "opengl >= 1.2.3"
 requires "webby >= 0.2.1"
 requires "windy >= 0.4.4"
 requires "silky >= 0.0.2"
+requires "shady >= 0.0.2"
+requires "metal4 >= 0.1.0"

src/gltf/animations.nim

@@ -1,7 +1,8 @@
 import
   std/math,
   vmath,
-  common, models
+  common,
+  models
 
 proc resetToBase*(node: Node) =
   ## Reset the node and its children to the original transform.
@@ -258,6 +259,7 @@ proc applyMorphs(node: Node) =
           tangent.x = dir.x
           tangent.y = dir.y
           tangent.z = dir.z
+      primitive.markGeometryDirty()
   for child in node.nodes:
     child.applyMorphs()
 
@@ -341,4 +343,3 @@ proc updateAnimation*(node: Node, dt: float32) =
       if clipIdx >= 0 and clipIdx < node.animations.len:
         applyClipAt(node.animations[clipIdx], node.animTime)
   node.applyMorphs()
-  node.updateOnGpu()

src/gltf/backends/directx/common.nim

@@ -0,0 +1,46 @@
+when not defined(windows):
+  {.error: "The glTF DirectX backend requires Windows.".}
+
+import
+  pkg/dx12
+
+type
+  DxTopology* = enum
+    dtPoint, dtLine, dtTriangle
+
+  PipelineKey* = object
+    topology*: DxTopology
+    doubleSided*: bool
+    blended*: bool
+
+  DxTexture* = ref object
+    resource*: ID3D12Resource
+    format*: uint32
+    isCube*: bool
+    mipLevels*: int
+
+  PrimitiveData* = ref object
+    geometryVersion*: uint64
+    vertexBuffer*: ID3D12Resource
+    vertexBufferPtr*: pointer
+    vertexBufferView*: D3D12_VERTEX_BUFFER_VIEW
+    vertexCapacity*: int
+    indexBuffer*: ID3D12Resource
+    indexBufferPtr*: pointer
+    indexBufferView*: D3D12_INDEX_BUFFER_VIEW
+    indexCapacity*: int
+    indexCount*: int
+    topology*: uint32
+    topologyKind*: DxTopology
+
+  MaterialData* = ref object
+    materialVersion*: uint64
+    heap*: ID3D12DescriptorHeap
+    handleGpu*: D3D12_GPU_DESCRIPTOR_HANDLE
+    textures*: seq[DxTexture]
+
+  GltfFileData* = ref object
+    sceneVersion*: uint64
+
+  DxPrimitive* = PrimitiveData
+  DxMaterial* = MaterialData