Eccelerators.Video

tests/Window3x3Test.lvt

namespace Eccelerators.Video.Tests

using Eccelerators.Video

/**
 * Two 4x4 ramp frames produce eight exact 3x3 windows under backpressure.
 */
@Test
component Window3x3Test
{
	// Source ramp and explicit line-buffer window; initialized only by pixels.
	source: PatternSource<4, 4>
	window: Window3x3<4, 4>
	enabled: bool
	pattern: int
	public accepted: out uint
	public errors: out uint
	public ticks: out uint

	/**
	 * Constructs independent producer/window in one reset and clock context.
	 */
	new()
	{
		this.source = new PatternSource<4, 4>(this.enabled, this.pattern)
		this.window = new Window3x3<4, 4>()
	}

	/**
	 * Drives an explicit token boundary and stalls every fourth sink edge.
	 */
	process Wire[]()
	{
		this.source.ready = this.window.upstreamReady
		this.window.inputData = this.source.data as byte
		this.window.inputValid = this.source.valid
		this.window.inputStart = this.source.frameStart
		this.window.inputLineEnd = this.source.lineEnd
		this.window.inputEnd = this.source.frameEnd
		this.window.inputId = this.source.frameId
		this.window.ready = this.accepted < 8 && this.ticks % 4 != 0
	}

	/**
	 * Independent ramp geometry checks all nine pixels and cropped markers.
	 */
	process Sink()
	{
		state Tick {
			this.ticks++

			if (this.window.valid && this.window.ready) {
				var position = this.accepted % 4
				var first = (position / 2) * 4 + position % 2

				if (this.window.topLeft != first as byte
					|| this.window.topCenter != (first + 1) as byte
					|| this.window.topRight != (first + 2) as byte
					|| this.window.middleLeft != (first + 4) as byte
					|| this.window.middleCenter != (first + 5) as byte
					|| this.window.middleRight != (first + 6) as byte
					|| this.window.bottomLeft != (first + 8) as byte
					|| this.window.bottomCenter != (first + 9) as byte
					|| this.window.bottomRight != (first + 10) as byte
					|| this.window.frameStart != (position == 0)
					|| this.window.lineEnd != (position % 2 == 1)
					|| this.window.frameEnd != (position == 3)
					|| this.window.frameId != this.accepted / 4) {
					this.errors++
				}

				this.accepted++
			}

			goto Tick
		}
	}

	/**
	 * Covers initialization, row reuse, next frame and output stalls.
	 */
	@Test
	fn PreservesWindowsAndCroppedMarkers()
	{
		this.enabled = true
		Simulation.Wait(300)
		assert this.accepted == 8
		assert this.errors == 0
	}
}