Camera non-default viewport size ignores camera clear color

[MarlonLam]

Description

When changing the camera viewport from default (0, 0, 1, 1) to non-default values e.g. (0.01, 0, 1, 1), the camera's clear color is ignored.

Test URL

Test project: https://playcanvas.com/editor/scene/1980662

Screenshots

(0, 0, 1, 1):

(0.01, 0, 1, 1):

Platform

Tested in Edge

Steps to Reproduce

1. Set camera viewport size to something other than (0, 0, 1, 1)
2. Launch

Additional Notes

From my own digging around, I found a property assignment for "clearColor":

engine/src/scene/renderer/render-pass-forward.js

Lines 273 to 280 in 4ab0ace

	if (!firstRenderAction || !camera.camera.fullSizeClearRect) {
	options.clearColor = renderAction.clearColor;
	options.clearDepth = renderAction.clearDepth;
	options.clearStencil = renderAction.clearStencil;
	}
	renderer.renderForwardLayer(camera.camera, renderAction.renderTarget, layer, transparent,
	shaderPass, renderAction.viewBindGroups, options);

But in "renderForwardLayer" function, the property read is "clearColors":

engine/src/scene/renderer/forward-renderer.js

Lines 696 to 701 in 4ab0ace

	const clearColor = options.clearColors ?? false;
	const clearDepth = options.clearDepth ?? false;
	const clearStencil = options.clearStencil ?? false;
	if (clearColor || clearDepth || clearStencil) {
	this.clear(camera, clearColor, clearDepth, clearStencil);
	}

[mvaligursky]

Thanks for this, easy to fix if you just point it out to us!