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++ // Copyright (C) 2026 The Qt Company Ltd.
++ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
++
++ // RenderPass.renderTargetFlags: PreserveColorContents test.
++ // Pass 1 clears a shared texture to red and renders no geometry.
++ // Pass 2 has PreserveColorContents so it does NOT clear; it renders a blue sphere
++ // on top of the red background left by pass 1.
++ // Expected result: background area = red, sphere area = blue.
++
++ import QtQuick
++ import QtQuick3D
++ import QtQuick3D.Helpers
++
++ Rectangle {
++ width: 400
++ height: 400
++ color: "black"
++
++ View3D {
++ anchors.fill: parent
++ renderOverrides: View3D.DisableInternalPasses
++
++ environment: SceneEnvironment {
++ backgroundMode: SceneEnvironment.Color
++ clearColor: "black"
++ }
++
++ PerspectiveCamera {
++ position: Qt.vector3d(0, 0, 300)
++ }
++
++ RenderPassTexture {
++ id: sharedTex
++ format: RenderPassTexture.RGBA8
++ }
++
++ // Pass 1: clear sharedTex to red, render nothing
++ RenderPass {
++ clearColor: "red"
++ commands: [
++ ColorAttachment { target: sharedTex },
++ DepthStencilAttachment {},
++ RenderablesFilter { renderableTypes: RenderablesFilter.None }
++ ]
++ }
++
++ // Pass 2: preserve red from pass 1, render blue sphere on top
++ RenderPass {
++ id: pass2
++ materialMode: RenderPass.OriginalMaterial
++ renderTargetFlags: RenderPass.PreserveColorContents
++ commands: [
++ ColorAttachment { target: sharedTex },
++ DepthStencilAttachment {}
++ ]
++ }
++
++ SimpleQuadRenderer {
++ texture: Texture {
++ textureProvider: RenderOutputProvider {
++ textureSource: RenderOutputProvider.UserPassTexture
++ renderPass: pass2
++ attachmentSelector: RenderOutputProvider.Attachment0
++ }
++ }
++ }
++
++ // Blue sphere in the centre of the view
++ Model {
++ source: "#Sphere"
++ scale: Qt.vector3d(2, 2, 2)
++ materials: PrincipledMaterial {
++ baseColor: "blue"
++ lighting: PrincipledMaterial.NoLighting
++ }
++ }
++ }
++ }