OffscreenFrameTarget

• Namespace: Turian.Engine.Core
• Source File: OffscreenFrameTarget.cs, OffscreenFrameTarget.Images.cs

Per-viewer offscreen render target. Mirrors SwapChain's attachment structure (MSAA color + depth + resolve) so existing render-system pipelines are compatible. The resolved image is blitted to a host-visible staging buffer each frame for CPU readback into an Avalonia WriteableBitmap. One instance per scene-viewer panel; all instances share the same Vulkan device.

Fields

ColorFormat (Format) = Format.B8G8R8A8Unorm: Color format used for the offscreen images. Matches Avalonia's Bgra8888 pixel format.

Properties

RenderPass

(RenderPass): Gets the render pass. Compatible with any pipeline built for the same format + MSAA sample count.

Width

(uint) { get; set }: Gets the current render width in pixels.

Height

(uint) { get; set }: Gets the current render height in pixels.

Public Methods

BeginFrame

public CommandBuffer? BeginFrame()

Begins a frame. Returns the command buffer to record rendering commands into, or null if the target has zero size.

Returns: CommandBuffer?

BeginRenderPass

public void BeginRenderPass(CommandBuffer cmd)

Begins the render pass on the given command buffer.

Parameters:

• cmd (CommandBuffer)

EndRenderPass

public void EndRenderPass(CommandBuffer cmd)

Ends the render pass.

Parameters:

• cmd (CommandBuffer)

EndFrame

public void EndFrame()

Ends the frame: copies the resolved color image into the staging buffer, submits, and waits for completion so the staging buffer is ready for CopyToSpan.

CopyToSpan

public void CopyToSpan(Span<byte> destination)

Copies the last rendered frame's pixels (BGRA8) into the given span. The span must be at least Width * Height * 4 bytes.

Parameters:

• destination (Span)

Resize

public void Resize(uint newWidth, uint newHeight)

Resizes the target. Disposes and recreates all Vulkan resources.

Parameters:

• newWidth (uint)
• newHeight (uint)

Dispose

public void Dispose()