--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/examples/E03_hello_cube.nim	Tue Jan 24 10:22:38 2023 +0700
@@ -0,0 +1,110 @@
+#
+#   TODO: Needs Depth-Buffer first!
+#
+#
+#
+#
+#
+#
+
+
+import std/times
+import std/strutils
+
+import semicongine
+
+type
+  # define type of vertex
+  VertexDataA = object
+    position: PositionAttribute[Vec3]
+    color: ColorAttribute[Vec3]
+  Uniforms = object
+    model: Descriptor[Mat44]
+    view: Descriptor[Mat44]
+    projection: Descriptor[Mat44]
+
+var
+  pipeline: RenderPipeline[VertexDataA, Uniforms]
+  uniforms: Uniforms
+  t: float32
+
+
+proc globalUpdate(engine: var Engine, dt: float32) =
+  let ratio = float32(engine.vulkan.frameSize.y) / float32(
+      engine.vulkan.frameSize.x)
+  t += dt
+  uniforms.model.value = translate3d(0'f32, 0'f32, 10'f32) * rotate3d(t,
+      Yf32) #  * rotate3d(float32(PI), Yf32)
+
+  uniforms.view.value = Unit44f32
+  uniforms.projection.value = Mat44(data: [
+    ratio, 0'f32, 0'f32, 0'f32,
+    0'f32, 1'f32, 0'f32, 0'f32,
+    0'f32, 0'f32, 1'f32, 0'f32,
+    0'f32, 0'f32, 0'f32, 1'f32,
+  ])
+  uniforms.projection.value = perspective(float32(PI / 4), float32(
+      engine.vulkan.frameSize.x) / float32(
+      engine.vulkan.frameSize.y), 0.1'f32, 100'f32)
+  engine.vulkan.device.updateUniformData(pipeline, uniforms)
+
+const
+  TopLeftFront = Vec3([-0.5'f32, -0.5'f32, -0.5'f32])
+  TopRightFront = Vec3([0.5'f32, -0.5'f32, -0.5'f32])
+  BottomRightFront = Vec3([0.5'f32, 0.5'f32, -0.5'f32])
+  BottomLeftFront = Vec3([-0.5'f32, 0.5'f32, -0.5'f32])
+  TopLeftBack = Vec3([0.5'f32, -0.5'f32, 0.5'f32])
+  TopRightBack = Vec3([-0.5'f32, -0.5'f32, 0.5'f32])
+  BottomRightBack = Vec3([-0.5'f32, 0.5'f32, 0.5'f32])
+  BottomLeftBack = Vec3([0.5'f32, 0.5'f32, 0.5'f32])
+const
+  cube_pos = @[
+    TopLeftFront, TopRightFront, BottomRightFront, BottomLeftFront, # front
+    TopLeftBack, TopRightBack, BottomRightBack, BottomLeftBack, # back
+    TopLeftBack, TopLeftFront, BottomLeftFront, BottomLeftBack, # left
+    TopRightBack, TopRightFront, BottomRightFront, BottomRightBack, # right
+    TopLeftBack, TopRightBack, TopRightFront, TopLeftFront, # top
+    BottomLeftFront, BottomRightFront, BottomRightBack, BottomLeftBack, # bottom
+  ]
+  cube_color = @[
+    Rf32, Rf32, Rf32, Rf32,
+    Rf32 * 0.5'f32, Rf32 * 0.5'f32, Rf32 * 0.5'f32, Rf32 * 0.5'f32,
+    Gf32, Gf32, Gf32, Gf32,
+    Gf32 * 0.5'f32, Gf32 * 0.5'f32, Gf32 * 0.5'f32, Gf32 * 0.5'f32,
+    Bf32, Bf32, Bf32, Bf32,
+    Bf32 * 0.5'f32, Bf32 * 0.5'f32, Bf32 * 0.5'f32, Bf32 * 0.5'f32,
+  ]
+var
+  tris: seq[array[3, uint16]]
+for i in 0'u16 ..< 6'u16:
+  let off = i * 4
+  tris.add [off + 0'u16, off + 1'u16, off + 2'u16]
+  tris.add [off + 2'u16, off + 3'u16, off + 0'u16]
+
+when isMainModule:
+  var myengine = igniteEngine("Hello cube")
+
+  # build a mesh
+  var trianglemesh = new IndexedMesh[VertexDataA, uint16]
+  trianglemesh.vertexData = VertexDataA(
+    position: PositionAttribute[Vec3](data: cube_pos),
+    color: ColorAttribute[Vec3](data: cube_color),
+  )
+  trianglemesh.indices = tris
+  var cube = newThing("cube", trianglemesh)
+
+  # upload data, prepare shaders, etc
+  const vertexShader = generateVertexShaderCode[VertexDataA, Uniforms]("""
+  out_position = (uniforms.projection * uniforms.view * uniforms.model) * vec4(in_position, 1);
+  """)
+  const fragmentShader = generateFragmentShaderCode[VertexDataA]()
+  pipeline = setupPipeline[VertexDataA, Uniforms, uint16](
+    myengine,
+    cube,
+    vertexShader,
+    fragmentShader
+  )
+  # show something
+  myengine.run(pipeline, globalUpdate)
+  pipeline.trash()
+  myengine.trash()