public static void Run()
{
using (var app = /*new VulkanApplication() */ new OpenGlApplication())
{
var win = app.CreateSimpleRenderWindow(samples: 8);
var cone = IndexedGeometryPrimitives.Cone.solidCone(V3d.OOO, V3d.OOI, 1.0, 0.2, 48, C4b.Red).ToSg(); // build object from indexgeometry primitives
var cube = SgPrimitives.Sg.box(AValModule.constant(C4b.Blue), AValModule.constant(Box3d.FromCenterAndSize(V3d.Zero, V3d.III))); // or directly using scene graph
var initialViewTrafo = CameraView.LookAt(V3d.III * 3.0, V3d.OOO, V3d.OOI);
var controlledViewTrafo = Aardvark.Application.DefaultCameraController.control(win.Mouse, win.Keyboard,
win.Time, initialViewTrafo);
var frustum = win.Sizes.Map(size => FrustumModule.perspective(60.0, 0.1, 10.0, size.X / (float)size.Y));
var whiteShader = Aardvark.Rendering.Effects.SimpleLighting.Effect;
var trafo = Effects.Trafo.Effect;
var currentAngle = 0.0;
var angle = win.Time.Map(t =>
{
return(currentAngle += 0.001);
});
var rotatingTrafo = angle.Map(a => Trafo3d.RotationZ(a));
var sg =
new[] {
cone.Trafo(AValModule.constant(Trafo3d.Translation(1.0, 1.0, 0.0))),
cube.Trafo(rotatingTrafo)
}
.ToSg()
.WithEffects(new[] { trafo, whiteShader })
.ViewTrafo(controlledViewTrafo.Map(c => c.ViewTrafo))
.ProjTrafo(frustum.Map(f => f.ProjTrafo()));
win.RenderTask =
Aardvark.Rendering.RenderTask.ofArray(
new[] {
app.Runtime.CompileClear(win.FramebufferSignature, AValModule.constant(C4f.Gray10)),
app.Runtime.CompileRender(win.FramebufferSignature, sg)
}
);
win.Run();
}
}
public static ISg WithVertexAttribute(this ISg sg, string semantic, Array data)
{
var bufferView = new BufferView(AValModule.constant((IBuffer) new ArrayBuffer(data)), data.GetType().GetElementType());
return(new Sg.VertexAttributeApplicator(Symbol.Create(semantic), bufferView, AValModule.constant(sg)));
}
public static void Run()
{
using (var app = /*new VulkanApplication() */ new OpenGlApplication())
{
var win = app.CreateSimpleRenderWindow(samples: 8);
// create CPU side array
var indices = new int[] { 0, 1, 2, 0, 2, 3 };
// wrap it into cpu buffer. ArrayBuffer is a CPU buffer (which will be uploaded on demand),
// In contrast, BackendBuffer would be a buffer prepared for a specific backend.
// both implement the IBuffer interface.
var indexBuffer = (IBuffer) new ArrayBuffer(indices);
// same applies for vertex data. Here we do not explicitly create an ArrayBuffer since
// we use convinience functions which internally create the ArrayBuffer for us
var vertices = new V3f[] {
new V3f(-1, -1, 0), new V3f(1, -1, 0), new V3f(1, 1, 0), new V3f(-1, 1, 0)
};
var colors = new C4b[] {
C4b.Green, C4b.Red, C4b.Blue, C4b.White
};
// In this low level API, we manually construct a drawCallInfo which essentially map
// to the arguments of glDrawElements etc.
var drawCallInfo = new DrawCallInfo()
{
FaceVertexCount = 6,
InstanceCount = 1, // DrawCallInfo is a struct and is initialized with zeros. make sure to set instanceCount to 1
FirstIndex = 0,
};
// next we create a scene graph node which describes a simple scene which, when rendered
// uses the supplied drawCallInfo to render geometry of type TriangleList (in constrast to points, linestrip etc)
var drawNode = new Sg.RenderNode(drawCallInfo, IndexedGeometryMode.TriangleList);
// the main principle is to use scene graph nodes as small building blocks to build together the
// complete scene description - a bit like lego ;)
// the same applies for applying geometry data. just like any other attribute (e.g. model trafos),
// vertex data can be inherited along the edges in the scene graph. thus the scene graph would look like this
// VertexIndexApplicator (applies index buffer to sub graph)
// ^
// |
// drawNode (performs draw call using attributes inherited along scene graph edges)
var sceneWithIndexBuffer =
new Sg.VertexIndexApplicator(
new BufferView(AValModule.constant(indexBuffer), typeof(int)),
drawNode
);
// of course constructing scene graph nodes manually is tedious. therefore we use
// convinience extension functions which can be chaned together, each
// wrapping a node around the previously constructed scene graph
var scene =
sceneWithIndexBuffer
.WithVertexAttribute("Positions", vertices)
// there are a lot such extension functions defined to conviniently work with scene graphs
.VertexAttribute(DefaultSemantic.Colors, colors)
// next, we apply the shaders (this way, the shader becomes the root node -> all children now use
// this so called effect (a pipeline shader which combines all shader stages into one object)
.WithEffects(new[] { Aardvark.Rendering.Effects.VertexColor.Effect });
// next we use the aardvark scene graph compiler to construct a so called render task,
// an optimized representation of the scene graph.
var renderTask = app.Runtime.CompileRender(win.FramebufferSignature, scene);
// next, we assign the rendertask to our render window.
win.RenderTask = renderTask;
win.Run();
}
}
