Feature DynamicBufferMesh with DrawArgsOption (Indirect Drawing)

[kopffarben]

PR Details

This enables indirect drawing

sponsored by mbox

This PR extends the DynamicBufferMesh node with the option to use a DrawArgsBuffer. This enables a dynamic mesh with a variable DrawCount, which is fully controlled by a ComputeShader.

This is especially important to make the complete compute pipeline of VL.Fuse indirect. Without the need for ugly ReadBacks.

All changes should not break any existing patches, as I have only added features.

HelpPatch

VL.Stride\help\Rendering\HowTo Dynamic Buffer Mesh with Indirect Draw Option.vl

Description

Changes in the source code

I have created two new classes in VL.Stride.Runtime.

• MeshDrawIndirect
  • which inherits from MeshDraw and adds a DrawArgs buffer.
• MeshRenderFeature
  • which in turn inherits MeshRenderFeature from Stride
  • there I handle the method Draw(RenderDrawContext context, RenderView renderView, RenderViewStage renderViewStage, int startIndex, int endIndex) a little differently than in Stride, otherwise it is a copy of Stride
  • I make a difference in the DrawCall whether it is a MeshDraw or a MeshDrawIndirect
  • The MeshRenderFeature node is automatically replaced because the new one in VL.Stride.Rendering is automatically referenced in the CompositingNodes

Changes in VL

Customized nodes:

• DynamicBufferMesh in VL.Stride.Rendering.vl
  • here I have added the option for a DrawArgsBuffer
• MeshRenderer in VL.Stride.Rendering.vl
  • here, too, the DrawCall distinguishes whether it is a DrawMesh or a MeshDrawIndirect

Added Nodes:

• DynamicDrawArgsBuffer in VL.Stride.Graphics.vl

Motivation and Context

Make VL.Fuse and VL.Stride more awsome

Types of changes

• Docs change / refactoring / dependency upgrade
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• My change requires a change to the documentation